CN116886159A - On-board regenerated satellite network operation method and system - Google Patents
On-board regenerated satellite network operation method and system Download PDFInfo
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- H04B7/00—Radio transmission systems, i.e. using radiation field
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- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
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- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
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Abstract
The application discloses a satellite regenerated satellite network operation method and system, which solve the problem that satellite regenerated transmission of an R17 and R18NTN system in the prior art cannot be networked. The on-board regenerated satellite network operation method for satellite with partial base station function includes the following steps: an adaptive layer with a routing function is arranged between the PDCP layer and the RLC layer or between the RLC layer and the MAC layer; the self-adaptive layer judges the next address and path ID in the received packet header; the destination address is not the current satellite node, and an outlet link corresponding to the corresponding inter-satellite link is selected according to the path ID, and the data packet is transmitted to a DU corresponding to the selected outlet link; the destination address is the current satellite node, selects an outlet link corresponding to the service link, and transmits the data packet to a DU corresponding to the selected port link; the satellite constructed by the application has lower network delay and more flexible deployment.
Description
Technical Field
The application relates to the technical field of space communication, in particular to an on-board regenerated satellite network operation method and system.
Background
For space communication services, 3GPP defines that a Non-terrestrial network (Non-Terrestrial Network, NTN) provides global network and information services for various users in space, in the sky, in the earth, and in the sea. NTN networks refer to networks that provide communication services to users using radio frequency and information processing resources carried on high, medium, low orbit satellites or other high altitude communication platforms.
In the satellite communication system of the base 5G, the user terminal performs information interaction with the data network through a gateway station by using a satellite Service Link (Service Link) and a Feeder Link (Feeder Link). The satellite platform can be a high-orbit satellite, a medium-orbit satellite and a low-orbit satellite, and can be suitable for two typical scenes of transparent forwarding and on-board regeneration according to the on-board loading capacity of the satellite. The transparent forwarding mode refers to that the satellite does not process signals, waveforms and the like in communication service and only forwards the data as a radio frequency amplifier; the renewable mode means that the satellite has processing capabilities such as modulation/demodulation, encoding/decoding, switching, routing and the like in addition to radio frequency amplification. In the case of a satellite based on a renewable mode, which has a certain on-board processing capability, it has the capability of providing the terminal with access network part functions (DUs) or access network full functions (cu+dus), even core network functions, the Inter-satellite information interaction between satellites can be performed through Inter-satellite links (ISLs).
For the R17, R18NTN system, only the NTN system architecture in the transparent forwarding mode is standardized at present, and satellites in the renewable mode have not been discussed yet, so an NTN system architecture based on the on-board renewable mode is needed.
Disclosure of Invention
The embodiment of the application provides a method and a system for running an on-board regenerated satellite network, which solve the problem that satellite regeneration transmission of an R17 and R18NTN system in the prior art cannot be networked.
The embodiment of the application provides a method for operating an on-board regenerated satellite network, which comprises the following steps:
an adaptive layer with a routing function is arranged between the PDCP layer and the RLC layer or between the RLC layer and the MAC layer;
the self-adaptive layer judges the next hop address and the path ID in the received packet header;
responding to the destination address not being the current service satellite node, selecting an outlet link corresponding to the corresponding inter-satellite link according to the path ID, and transmitting the data packet to the selected outlet link; the service satellite nodes are connected through inter-satellite links;
responding to the destination address being the current service satellite node, selecting an outlet link corresponding to the service link, and transmitting the data packet to the selected outlet link; the service satellite nodes are connected with the terminals through service links.
Further, the method further comprises the steps of:
the service satellite node receives the data packet sent by the gateway station through the feed link;
the current service satellite node is connected with an inter-satellite link interface unit of the next service satellite node through an inter-satellite link through a service link interface unit;
the service satellite node of the destination address is connected with the terminal through a service link.
Further, the method further comprises the steps of:
the service satellite node receives the data packet sent by the gateway station through the feed link;
the current service satellite node is connected with a service link interface unit inter-satellite link of the next service satellite node through a service link interface unit;
the service satellite node of the destination address is connected with the terminal through a service link.
Further, for the downlink traffic of the gateway station connected to the terminal through a single service satellite node, the transmission mode thereof further comprises the steps of:
the service satellite node receives the data packet through the feed link;
and transmitting the data packet to the terminal through the service link in response to the destination address of the data packet being the current service satellite node.
Further, for the uplink traffic of the gateway station connected to the terminal through a single service satellite node, the transmission mode thereof further comprises the steps of:
the service satellite node receives data through a service link;
in response to the packet destination address being the current serving satellite node, the packet is passed to a feeder circuit, which terminates at the gateway station.
Further, for the downlink traffic of the gateway station connected to the terminal through a plurality of service satellite nodes, the transmission mode thereof further comprises the steps of:
the service satellite node receives the data packet through the feed link;
transmitting the data packet to other service satellite nodes through inter-satellite links in response to the destination address of the data packet not being the current service node;
and transmitting the data packet to the terminal through the service link in response to the destination address of the data packet being the current service node.
Further, for the uplink traffic of the gateway station connected to the terminal through a plurality of service satellite nodes, the transmission mode thereof further comprises the steps of:
the service satellite node receives data through a service link;
transmitting the data packet to other service satellite nodes through inter-satellite links in response to the destination address of the data packet not being the current service satellite node;
in response to the packet destination address being the current service node, the packet is passed to a feeder circuit, which terminates at the gateway station.
The embodiment of the application also provides an on-board regenerated satellite network system which is used for realizing the method of any one of the above embodiments and comprises a satellite node, a ground gateway station and a routing unit. The satellite node includes a service link interface unit and an inter-satellite link interface unit. The service link interface unit is used for connecting with the terminal. The inter-satellite link interface unit is used for connecting with a ground gateway station. Adjacent satellites are connected with an inter-satellite link interface unit through a service link interface unit or connected with two inter-satellite link interface units. The ground gateway station comprises a gateway station centralized unit and a gateway station distributed unit. The gateway station centralized unit is used for uniformly scheduling and controlling the gateway station distributed units. The gateway station distributed unit is used for providing feed connection with satellites. The routing unit is used for calculating the inter-satellite routing.
Further, the gateway station is connected to the service satellite node via a feeder link. The service satellite node comprises a service link interface unit and an inter-satellite link interface unit. The current service satellite node is connected with the inter-satellite link of the inter-satellite link interface unit of the next service satellite node through the service link interface unit. The service satellite node of the destination address is connected with the terminal through a service link.
Further, the gateway station is connected to the service satellite node via a feeder link. The service satellite node comprises a service link interface unit and an inter-satellite link interface unit. The current service satellite node is connected with the inter-satellite link of the service link interface unit of the next service satellite node through the service link interface unit. The service satellite node of the destination address is connected with the terminal through a service link.
The above at least one technical scheme adopted by the embodiment of the application can achieve the following beneficial effects:
the satellite constructed by the application has lower network delay and more flexible deployment. The renewable mode satellites can transmit information over an inter-satellite link (ISL) without mapping the information back to the ground. Many gateway stations on the ground are not required.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic diagram of a prior art overall network architecture;
FIG. 2 is a schematic diagram of an example prior art network architecture;
FIG. 3 is a flowchart of a method for operating an on-board regenerative satellite network according to an embodiment of the present application;
FIG. 4 is a block diagram of an on-board regenerative satellite network system according to an embodiment of the present application;
fig. 5 is a block diagram of another satellite-based regenerative satellite network system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The following describes in detail the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a prior art overall network architecture.
The network architecture of the satellite communication system based on 5G mainly considers a geosynchronous orbit satellite and a low orbit satellite as typical satellite platforms, and research progress based on NTN in the 3GPP R16R 17 stage is mainly developed aiming at the satellite communication system based on a transparent forwarding mode, so that an overall network architecture is formed as shown in figure 1.
The high-low orbit satellites are used as important nodes of the access network, and provide access service for the terminal through the function of transparent forwarding of signals between the service link and the feed link.
The terminals mainly cover the handheld terminals and the VSAT terminals.
The high-orbit satellite and the low-orbit satellite can provide access service for the user terminal. The low orbit satellite is mainly responsible for communication service with higher requirement on transmission delay due to the characteristics of shorter round trip communication delay relative to the geosynchronous orbit and the like; and the geosynchronous orbit satellite can provide higher guarantee for the ground return of data service due to the characteristics of geostationary state, wide coverage range and the like.
The gateway station is a communication node for data exchange between the satellite and the backhaul network. In order to achieve data backhaul to the data network, both geosynchronous satellites and low-orbit satellites need to pass through gateway stations. In a satellite communication system based on 5G, a geosynchronous orbit satellite and a low orbit satellite can be accessed into a ground gateway station by adopting a 5G air interface, so that data landing is realized, a ground 5G industrial chain is multiplexed, the design and operation complexity of the satellite is reduced, and the continuity of communication service is further ensured.
The satellite has a transparent bent pipe transmission function between a user and a foundation access network, is completely transparent to a 5G NR protocol comprising a physical layer, and does not influence the 5G network architecture, the transmission protocol and the system.
Fig. 2 is a schematic diagram of an example prior art network architecture.
As shown in fig. 2 (1), the satellite load realizes frequency conversion, and there are 1 rf amplifier in the uplink and downlink directions, corresponding to 1 analog rf repeater. Thus, the satellite duplicates the air interface signals from the feed link to the service link and vice versa.
Based on the network architecture that handles forwarding, it is necessary to add some/all access network functions to the satellite. The unified access authentication without sense of the user can be realized, and unified and intelligent flexible scheduling on network resources, topology, functions and data can be realized. But this mode requires increased on-board processing power and places higher demands on satellite load design.
The network architecture based on-board processing forwarding has the following two modes.
The first satellite serves as a 5G access network base station, and implements the gNB full stack function on the satellite, as shown in fig. 2 (2).
In the second mode, the 5G RAN has the function of CU-DU separation, so that CU can be put into a ground station for processing, and the satellite load is reduced. The on-board load realizes gNB-DU function, and the ground gateway station realizes gNB-CU function. The Satellite Radio Interface (SRI) transmits the F1 protocol between a ground CU and an on-board DU. As shown in fig. 2 (3).
FIG. 3 is a flowchart of a method for operating an on-board regenerative satellite network according to an embodiment of the present application.
The embodiment of the application provides a method for operating an on-board regenerated satellite network, which comprises the following steps:
step 101, setting an adaptive layer with a routing function between a PDCP layer and an RLC layer or between the RLC layer and a MAC layer;
the adaptation layer may be located between the PDCP layer and the RLC layer, or may be located between the RLC layer and the MAC layer.
Step 102, the self-adaptive layer judges the next hop address and the path ID in the received packet header;
step 103, responding to the destination address not being the current service satellite node, selecting the corresponding outlet link of the corresponding inter-satellite link according to the path ID, and transmitting the data packet to the selected outlet link;
the service satellite nodes are connected through inter-satellite links.
104, responding to the current service satellite node of the destination address, selecting an outlet link corresponding to the service link, and transmitting the data packet to the selected outlet link;
the service satellite nodes are connected with the terminals through service links.
The routing function executing process is to select the corresponding outlet link of the corresponding inter-satellite link according to the next address and the path ID in the packet header, and transmit the data packet to the DU corresponding to the selected port link if the destination address is not the current satellite node.
If the destination address is the current satellite node, selecting an egress link corresponding to the service link, and transmitting the data packet to a DU corresponding to the selected egress link.
Further, the functions of the adaptation layer also include mapping of QoS flows, flow control, and congestion control.
The adaptive layer functions include: routing, mapping of QoS flows, traffic control, congestion control, etc.
Further, the method further comprises the steps of:
the service satellite node receives the data packet sent by the gateway station through the feed link;
the current service satellite node is connected with an inter-satellite link interface unit of the next service satellite node through an inter-satellite link through a service link interface unit;
the service satellite node of the destination address is connected with the terminal through a service link.
Further, the method further comprises the steps of:
the service satellite node receives the data packet sent by the gateway station through the feed link;
the current service satellite node is connected with a service link interface unit inter-satellite link of the next service satellite node through a service link interface unit;
the service satellite node of the destination address is connected with the terminal through a service link.
For example, the service satellite node includes a service link interface unit and an inter-satellite link interface unit.
The embodiment of the application also provides an on-board regenerated satellite network system which is used for realizing the method of any one of the above embodiments and comprises a satellite node1, a ground gateway station 2 and a routing unit.
The satellite node comprises a service link interface unit 11 and an inter-satellite link interface unit 12.
The service link interface unit is used for connecting with the terminal.
The inter-satellite link interface unit is used for connecting with a ground gateway station.
Adjacent satellites are connected with an inter-satellite link interface unit through a service link interface unit or connected with two inter-satellite link interface units.
Further, the satellite service node functions include radio frequency filtering, frequency conversion, power amplification, modulation/demodulation, encoding/decoding, switching, and routing.
For example, the satellite service node may comprise a satellite distributed unit (SLT-DU) serving link interface unit, a satellite mobile terminal unit (SLT-MT) inter-satellite link interface unit, wherein
The satellite service node functions include: radio frequency filtering, frequency conversion, power amplification, modulation/demodulation, encoding/decoding, switching, routing.
The SLT-MT main functions include providing a feed connection to a ground gateway station;
the SLT-DU primary function includes providing a connection with a terminal.
Both may be used for inter-satellite link connection with adjacent satellites.
The ground gateway station includes a gateway station centralized unit 21 and a gateway station distributed unit 22.
The gateway station centralized unit is used for uniformly scheduling and controlling the gateway station distributed units.
The gateway station distributed unit is used for providing feed connection with satellites.
The routing unit is used for calculating the inter-satellite routing.
It should be noted that the routing unit may be a separate module, or may be integrated in the gateway station or the satellite service node, which is not limited herein.
For example, the routing module configures the satellites on the gateway centralized unit, and the gateway centralized unit performs unified control on the satellites, that is, routing calculation between the satellites is performed on the gateway GW-CU, and then performed by the adaptive layer. The functional module of the adaptive layer is located at a satellite service node.
Further, the terrestrial gateway functions include radio frequency filtering, frequency conversion, power amplification, modulation/demodulation, encoding/decoding, switching, and routing.
For example, the ground gateway station may include a gateway station centralized unit (GW-CU) and a gateway station distributed unit (GW-DU).
The ground gateway station functions include: radio frequency filtering, frequency conversion, power amplification, modulation/demodulation, encoding/decoding, switching, routing.
The main functions of the GW-DU include providing a feed connection to a ground gateway station.
The GW-CU primary functions include providing unified scheduling and control of GW-DUs.
Further, links present in the system include feeder links, service links, and inter-satellite links.
The satellite mobile terminal unit is connected with the gateway station distributed unit through a feed link.
The satellite distributed units are connected with the satellite mobile terminal units through inter-satellite links.
The satellite distributed units are connected with the terminals through service links.
Further, the gateway station distributed units are connected to one or more satellite mobile terminal units.
Further, the feed link and the inter-satellite link are connected through an Xn interface. The service links are connected through wireless UU ports.
Further, the satellite nodes perform routing and path selection through the network IP.
For example, the adaptive layer is on the satellite service node, the module for calculating the route is on the GW-CU, the configuration of the satellite is uniformly controlled by the GW-CU, and the configuration is performed by the adaptive layer.
Example 1
Fig. 4 is a block diagram of an on-board regenerative satellite network system according to an embodiment of the present application.
Further, the gateway station is connected to the service satellite node via a feeder link. The service satellite node comprises a service link interface unit and an inter-satellite link interface unit. The current service satellite node is connected with the inter-satellite link of the inter-satellite link interface unit of the next service satellite node through the service link interface unit. The service satellite node of the destination address is connected with the terminal through a service link.
Such as satellite distributed units (SLT-DUs) and satellite mobile terminal units (SLT-MTs). The inter-satellite link interface unit is a satellite mobile terminal unit (SLT-MT), the service link interface unit is a satellite distributed unit (SLT-DU), and the satellite mobile terminal unit of one service satellite node is connected with the satellite distributed unit of another service satellite node through an inter-satellite link.
The gateway station is connected with the service satellite node through a feed link. The service satellite nodes are connected through service links. The service satellite node is connected with the terminal through a service link.
The inter-satellite link is the architecture of SLT-DU and SLT-MT connections:
the GW-CU carries logical nodes of RRC, SDAP and PDCP protocols of the gNB or RRC and PDCP protocols of the en gNB, which control the operation of one or more GW-DUs. The GW-CU terminates the F1 interface connected with the GW-DU.
The GW-DU carries logical nodes of the RLC, MAC and PHY layers of the gNB or en-gNB, the operation of which is controlled in part by the GW-CU. One GW-DU supports one or more cells. The GW-DU terminates the F1 interface connected with the GW-CU.
The SLT-MT function acts as a UE and reuses the UE procedure to connect to:
-GW-DUs on parent satellite nodes or gateway stations for access and backhaul through UU air interface protocol;
-GW-CU on gateway station via RRC for controlling access and backhaul links;
connect to 5GC, e.g. AMF, through NAS protocol.
The SLT-DU connection SLT-MT has relatively low implementation difficulty, and the inter-satellite link executes UU port protocol.
Further, for the downlink traffic of the gateway station connected to the terminal through a single service satellite node, the transmission mode thereof further comprises the steps of:
the service satellite node receives the data packet through the feed link;
and transmitting the data packet to the terminal through the service link in response to the destination address of the data packet being the current service satellite node.
For example, as shown in fig. 4, the downlink traffic of UE1, the data packet is transferred from the core network to a Gateway (GW), which is transferred to the service satellite node SLT-node1 of UE1 through the feeder link terminated by GW-DU and SLT-MT. At this time, the destination address of the packet header of the packet adaptation layer is SLT-node1. When SLT-node1 finds that the destination address of the data packet is itself, the data packet is transferred to the DU corresponding to the service link, wherein the service link is terminated by UE1 and SLT-DU. Wherein the GW-CU uniformly allocates packet paths and destination addresses of packets.
Further, for the uplink traffic of the gateway station connected to the terminal through a single service satellite node, the transmission mode thereof further comprises the steps of:
the service satellite node receives data through a service link;
in response to the packet destination address being the current serving satellite node, the packet is passed to a feeder circuit, which terminates at the gateway station.
For example, as shown in fig. 4, the uplink traffic of UE1, data is generated by UE and sent to service satellite node SLT-node1, where the destination address of packet header of the packet adaptive layer is SLT-node1, the service link is terminated by UE1 and SLT-DU, and when SLT-node1 finds that the destination address of the uplink packet is itself, the data packet is transferred to SLT-MT corresponding to the feeder link, and the feeder link is terminated by GW-DU and SLT-MT. The SLT-MT passes data to the connected GW-DUs through the feeder link.
Further, for the downlink traffic of the gateway station connected to the terminal through a plurality of service satellite nodes, the transmission mode thereof further comprises the steps of:
the service satellite node receives the data packet through the feed link;
transmitting the data packet to other service satellite nodes through inter-satellite links in response to the destination address of the data packet not being the current service node;
and transmitting the data packet to the terminal through the service link in response to the destination address of the data packet being the current service node.
For example, as shown in fig. 4, the downlink traffic of UE2 is transmitted from the core network to Gateway (GW), and the Gateway transmits to the service satellite node SLT-node1 of UE2 and then to the service satellite node SLT-node3 of UE1 via the feeder link terminated by GW-DU and SLT-MT. At this time, the destination address of the packet header of the packet adaptation layer is SLT-node3. When SLT-node1 finds that the destination address of the data packet is not self, the data packet is transferred to DU corresponding to the inter-satellite link (the inter-satellite link is terminated at SLT-DU and SLT-MT), and when SLT-node3 finds that the destination address of the data packet is self, the data packet is transferred to DU corresponding to the service link, wherein the service link is terminated at UE2 and SLT-DU. Wherein the GW-CU uniformly allocates packet paths and destination addresses of packets.
Further, for the uplink traffic of the gateway station connected to the terminal through a plurality of service satellite nodes, the transmission mode thereof further comprises the steps of:
the service satellite node receives data through a service link;
transmitting the data packet to other service satellite nodes through inter-satellite links in response to the destination address of the data packet not being the current service satellite node;
in response to the packet destination address being the current service node, the packet is passed to a feeder circuit, which terminates at the gateway station.
For example, as shown in fig. 4, the uplink flow of UE2 is generated by UE and sent to service satellite node SLT-node3, where the destination address of packet header of the packet adaptive layer is SLT-node1, service link is terminated by UE2 and SLT-DU, when SLT-node1 finds that the destination address of uplink packet is not itself, the packet is transferred to DU corresponding to inter-satellite link (inter-satellite link is terminated by SLT-DU and SLT-MT), when SLT-node1 finds that the destination address of uplink packet is itself, the packet is transferred to SLT-MT corresponding to feeder link, and feeder link is terminated by GW-DU and SLT-MT. The SLT-MT passes data to the connected GW-DUs through the feeder link.
Example 2
Fig. 5 is a block diagram of another satellite-based regenerative satellite network system according to an embodiment of the present application.
Further, the gateway station is connected to the service satellite node via a feeder link. The service satellite node comprises a service link interface unit and an inter-satellite link interface unit. The current service satellite node is connected with the inter-satellite link of the service link interface unit of the next service satellite node through the service link interface unit. The service satellite node of the destination address is connected with the terminal through a service link.
Such as satellite distributed units (SLT-DUs) and satellite mobile terminal units (SLT-MTs). The inter-satellite link interface unit is a satellite mobile terminal unit (SLT-MT), the service link interface unit is a satellite distributed unit (SLT-DU), and one service satellite connects the satellite mobile terminal unit of the node with the satellite mobile terminal unit of another service satellite node through an inter-satellite link.
The gateway station is connected with the service satellite node through a feed link. The service satellite nodes are connected through inter-satellite links. The service satellite node is connected with the terminal through a service link.
The inter-satellite link is connected by SLT-MT and SLT-MT:
the GW-CU carries logical nodes of RRC, SDAP and PDCP protocols of the gNB or RRC and PDCP protocols of the engNB, which control the operation of one or more GW-DUs. The GW-CU terminates the F1 interface connected with the GW-DU.
The GW-DU carries logical nodes of the RLC, MAC and PHY layers of the gNB or en-gNB, the operation of which is controlled in part by the GW-CU. One GW-DU supports one or more cells. The GW-DU terminates the F1 interface connected with the GW-CU.
The SLT-MT function acts as a UE and reuses the UE procedure to connect to:
-connect to SLT-MT by D2D or sidelink technology;
-GW-CU on gateway station via RRC for controlling access and backhaul links;
connect to 5GC, e.g. AMF, through NAS protocol.
SLT-MT connection SLT-MT networking is relatively flexible, and D2D, sidelink, or laser connection can be performed between the SLT-MT connections.
Further, for the downlink traffic of the gateway station connected to the terminal through a single service satellite node, the transmission mode thereof further comprises the steps of:
the service satellite node receives the data packet through the feed link;
and transmitting the data packet to the terminal through the service link in response to the destination address of the data packet being the current service satellite node.
For example, as shown in fig. 5, the downlink traffic of UE1, the data packet is transferred from the core network to a Gateway (GW), which is transferred to the service satellite node SLT-node1 of UE1 through the feeder link terminated by GW-DU and SLT-MT. At this time, the destination address of the packet header of the packet adaptation layer is SLT-node1. When SLT-node1 finds that the destination address of the data packet is self, the data packet is transferred to SLT-DU corresponding to the service link, wherein the service link is terminated by UE1 and SLT-DU. Wherein the GW-CU uniformly allocates packet paths and destination addresses of packets.
Further, for the uplink traffic of the gateway station connected to the terminal through a single service satellite node, the transmission mode thereof further comprises the steps of:
the service satellite node receives data through a service link;
in response to the packet destination address being the current serving satellite node, the packet is passed to a feeder circuit, which terminates at the gateway station.
For example, as shown in fig. 5, the uplink traffic of UE1, data is generated by UE and sent to service satellite node SLT-node1, where the destination address of packet header of the packet adaptive layer is SLT-node1, the service link is terminated by UE1 and SLT-DU, and when SLT-node1 finds that the destination address of the uplink packet is itself, the data packet is transferred to SLT-MT corresponding to the feeder link, and the feeder link is terminated by GW-DU and SLT-MT. The SLT-MT passes data to the connected GW-DUs through the feeder link.
Further, for the downlink traffic of the gateway station connected to the terminal through a plurality of service satellite nodes, the transmission mode thereof further comprises the steps of:
the service satellite node receives the data packet through the feed link;
transmitting the data packet to other service satellite nodes through inter-satellite links in response to the destination address of the data packet not being the current service node;
and transmitting the data packet to the terminal through the service link in response to the destination address of the data packet being the current service node.
For example, as shown in fig. 5, there are two links to UE 2:
PATH1：GW-DU→SLT-node1→SLT-node4→UE；
PATH2：SLT-node1→SLT-node2→SLT-node3→SLT-node4→UE。
the data packets are transferred by the core network to Gateway (GW) stations, which are transferred to serving satellite nodes SLT-node1 of UE2 via feeder links terminated by GW-DUs and SLT-MTs. At this time, the destination address of the packet header of the packet adaptation layer is SLT-node4. When SLT-node1 finds that the destination address of the data packet is not self, the data packet selects a proper path according to the path ID, and is transmitted to SLT-MT (inter-satellite link is terminated at SLT-MT and SLT-MT) corresponding to the inter-satellite link of the selected path, when SLT-node4 finds that the destination address of the data packet is self, the data packet is transmitted to DU corresponding to the service link, wherein the service link is terminated at UE2 and SLT-DU. Wherein the GW-CU uniformly allocates packet paths and destination addresses of packets.
Further, for the uplink traffic of the gateway station connected to the terminal through a plurality of service satellite nodes, the transmission mode thereof further comprises the steps of:
the service satellite node receives data through a service link;
transmitting the data packet to other service satellite nodes through inter-satellite links in response to the destination address of the data packet not being the current service satellite node;
in response to the packet destination address being the current service node, the packet is passed to a feeder circuit, which terminates at the gateway station.
For example, as shown in fig. 5, there are two links to UE 2:
PATH1:UE→SLT-node4→SLT-node1→GW-DU；
PATH2:UE→SLT-node4→SLT-node3→SLT-node2→SLT-node1→GW-DU。
the data is generated by UE and sent to service satellite node SLT-node4, at this time, the destination address of the packet head of the self-adapting layer of the data packet is SLT-node1, the service link is terminated by UE2 and SLT-DU, when SLT-node4 finds that the destination address of the uplink data packet is not self, the data packet selects a proper path according to the path ID and is transferred to SLT-MT corresponding to the selected path inter-satellite link, the data packet is transferred to MT corresponding to the inter-satellite link (the inter-satellite link is terminated by SLT-MT and SLT-MT), when SLT-node1 finds that the destination address of the uplink data packet is self, the data packet is transferred to SLT-MT corresponding to the feed link, and the feed link is terminated by GW-DU and SLT-MT. The SLT-MT passes data to the connected GW-DUs through the feeder link.
It should be noted that, when the satellite node includes a complete base station function, the satellite node function includes: radio frequency filtering, frequency conversion, power amplification, modulation/demodulation, encoding/decoding, switching, routing.
The ground gateway station comprises complete base station functions, and the ground gateway station functions comprise: radio frequency filtering, frequency conversion, power amplification, modulation/demodulation, encoding/decoding, switching, routing.
Links mainly existing in the system include feeder links, service links, inter-satellite links:
feed links, inter-satellite links are connected through Xn interfaces, and service links are connected through wireless UU interfaces
In a regenerative satellite system, satellite nodes perform routing and path selection through network IP.
3GPP R17 is the first version supporting NTN (Non-terrestrial networks Non-terrestrial network), and NTN enhancement for R18 is an evolving standard for R17 NTN. The WID of NR R18NR NTN enhancement specifies four discussion goals, coverage enhancement, NTN-TN, NTN-NTN mobility and service continuity enhancement, respectively, which are one important discussion goal of R18NR NTN enhancement, network-verified UE location and deployment of NR-NTN in the above 10GHz band. The present patent will provide corresponding enhancements to NTN-TN and NTN-NTN mobility and service continuity.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The application therefore also proposes a computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, implements a method according to any of the embodiments of the application.
Furthermore, the application also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of being run by the processor, wherein the processor executes the computer program to realize the method according to any embodiment of the application.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory. The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (10)
1. The on-board regenerated satellite network operation method is characterized by comprising the following steps:
an adaptive layer with a routing function is arranged between the PDCP layer and the RLC layer or between the RLC layer and the MAC layer;
the self-adaptive layer judges the next hop address and the path ID in the received packet header;
responding to the destination address not being the current service satellite node, selecting an outlet link corresponding to the corresponding inter-satellite link according to the path ID, and transmitting the data packet to the selected outlet link; the service satellite nodes are connected through inter-satellite links;
responding to the destination address being the current service satellite node, selecting an outlet link corresponding to the service link, and transmitting the data packet to the selected outlet link; the service satellite nodes are connected with the terminals through service links.
2. The method of on-board regenerative satellite network operation of claim 1, further comprising the steps of:
the service satellite node receives the data packet sent by the gateway station through the feed link;
the current service satellite node is connected with an inter-satellite link interface unit of the next service satellite node through an inter-satellite link through a service link interface unit;
the service satellite node of the destination address is connected with the terminal through a service link.
3. The method of on-board regenerative satellite network operation of claim 1, further comprising the steps of:
the service satellite node receives the data packet sent by the gateway station through the feed link;
the current service satellite node is connected with a service link interface unit inter-satellite link of the next service satellite node through a service link interface unit;
the service satellite node of the destination address is connected with the terminal through a service link.
4. The method for operating a satellite based regenerative satellite network according to claim 1, wherein for downstream traffic from a gateway station connected to a terminal via a single service satellite node, the method further comprises the steps of:
the service satellite node receives the data packet through the feed link;
and transmitting the data packet to the terminal through the service link in response to the destination address of the data packet being the current service satellite node.
5. The method for operating a satellite based regenerative satellite network according to claim 1, wherein for the upstream traffic of the gateway station connected to the terminal through a single service satellite node, the method further comprises the steps of:
the service satellite node receives data through a service link;
in response to the packet destination address being the current serving satellite node, the packet is passed to a feeder circuit, which terminates at the gateway station.
6. The method for operating a satellite based regenerative satellite network according to claim 1, wherein for downstream traffic of a gateway station connected to a terminal through a plurality of service satellite nodes, the method further comprises the steps of:
the service satellite node receives the data packet through the feed link;
transmitting the data packet to other service satellite nodes through inter-satellite links in response to the destination address of the data packet not being the current service node;
and transmitting the data packet to the terminal through the service link in response to the destination address of the data packet being the current service node.
7. The method for operating a satellite based regenerative satellite network according to claim 1, wherein for the upstream traffic of the gateway station connected to the terminal through the plurality of service satellite nodes, the method further comprises the steps of:
the service satellite node receives data through a service link;
transmitting the data packet to other service satellite nodes through inter-satellite links in response to the destination address of the data packet not being the current service satellite node;
in response to the packet destination address being the current service node, the packet is passed to a feeder circuit, which terminates at the gateway station.
8. An on-board regenerative satellite network system for implementing the method of claims 1-7, comprising satellite nodes, ground gateway stations, and routing units;
the satellite node comprises a service link interface unit and an inter-satellite link interface unit;
the service link interface unit is used for connecting with a terminal;
the inter-satellite link interface unit is used for connecting with a ground gateway station;
adjacent satellites are connected with an inter-satellite link interface unit through a service link interface unit or connected with two inter-satellite link interface units;
the ground gateway station comprises a gateway station centralized unit and a gateway station distributed unit;
the gateway station centralized unit is used for uniformly scheduling and controlling the gateway station distributed units;
the gateway station distributed unit is used for providing feed connection with satellites;
the routing unit is used for calculating the inter-satellite routing.
9. The on-board regenerative satellite network system of claim 8, wherein the gateway station is connected to the service satellite node by a feeder link;
the service satellite node comprises a service link interface unit and an inter-satellite link interface unit;
the current service satellite node is connected with an inter-satellite link of an inter-satellite link interface unit of the next service satellite node through a service link interface unit;
the service satellite node of the destination address is connected with the terminal through a service link.
10. The on-board regenerative satellite network system of claim 8, wherein the gateway station is connected to the service satellite node by a feeder link;
the service satellite node comprises a service link interface unit and an inter-satellite link interface unit;
the current service satellite node is connected with a service link interface unit inter-satellite link of the next service satellite node through a service link interface unit;
the service satellite node of the destination address is connected with the terminal through a service link.
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