CN108882307B - Method and device for separating control from service - Google Patents
Method and device for separating control from service Download PDFInfo
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- CN108882307B CN108882307B CN201810390419.0A CN201810390419A CN108882307B CN 108882307 B CN108882307 B CN 108882307B CN 201810390419 A CN201810390419 A CN 201810390419A CN 108882307 B CN108882307 B CN 108882307B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18517—Transmission equipment in earth stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a method and a device for separating control and service, wherein the method comprises the following steps: the ground gateway receives downlink service data sent by a server; and the ground gateway determines to send the downlink service data to the space-based node or send the downlink service data to the base station according to the mobile state and the transmission channel state of the user side, so that the space-based node or the base station can send the downlink service data to the user side. The invention takes the satellite as a control party, and provides wide-area control service for users by utilizing the characteristic of wide satellite coverage.
Description
Technical Field
The invention relates to the technical field of converged communication networks, in particular to a method and a device for separating control and service.
Background
China raises the air-ground integrated network into a significant national strategy, fully exerts the air, space and ground information technical advantages, completes the overall utilization, task distribution, action organization and management of resources through the acquisition, cooperation, transmission and processing of multi-dimensional information, realizes the real-time, reliable and on-demand service for different users, and provides an efficient, cooperative, intelligent, ubiquitous and mobile information infrastructure and decision support system. Combining beam coverage services in satellite communication networks with small cell enhanced data services of terrestrial communication systems is an important aspect of future communication system convergence. The combination of satellite communication systems with terrestrial communication systems can take advantage of the wide coverage and common service control of satellites to provide more on-demand graceful service. In addition, technologies such as user mobility prediction and on-demand hot resource are all hot research directions by using global information controlled by satellites. Currently, for research work on a satellite ground cooperative network, research on a cognitive network and cooperative communication has been developed from different angles, and mainly focuses on aspects of system and network convergence architecture, quality of service guarantee, spectrum sharing, end-to-end design and the like. The International Telecommunications Union (ITU) defines a "satellite-terrestrial hybrid system" in which the satellite and the terrestrial operate in different frequency bands using separate network management systems.
At present, the ground communication network and the satellite network are still two independent systems and are not effectively combined. In the aspect of ground network, the problem of insufficient coverage still exists; in the aspect of satellite networks, the characteristics of wide area coverage, wide frequency band, high reliability and the like of satellites are not effectively utilized. Meanwhile, simply introducing a satellite directly into a terrestrial communication system may not effectively take advantage of the satellite, although some improvement in network performance may be achieved. The convergence of the satellite and the 5G network is the direction of future network development, but theoretical research and simulation proof of the system are still lacked. Therefore, a method is needed to develop the function of satellite and ground network cooperation.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and a device for separating control and service under a satellite ground collaboration network architecture, which are used for forwarding part of service plane contents by a satellite, thereby reducing interference of a ground network and reducing burden of the ground network.
In order to achieve the above object, the present invention provides a method for separating control and service, wherein the method comprises:
the ground gateway receives downlink service data sent by a server;
and the ground gateway determines to send the downlink service data to the space-based node or send the downlink service data to the base station according to the mobile state and the transmission channel state of the user side, so that the space-based node or the base station can send the downlink service data to the user side.
Optionally, before the ground gateway receives the downlink service data sent by the server, the method further includes:
the ground gateway receives uplink control signaling which is sent by each user side and gathered by the base station;
the ground gateway sends the uplink control signaling to a space-based node; the space-based node serves as a control party and provides control service for each user side.
Optionally, the control service includes at least one of: radio bearer control, radio access control, connection mobility control.
Optionally, the determining, by the ground gateway, that the downlink service data is sent to the space-based node or the downlink service data is sent to the base station according to the mobile state and the transmission channel state of the user side includes:
the ground gateway judges whether the mobility parameter of the user side is larger than a first preset threshold value or not;
if yes, the ground gateway sends the downlink service data to a space-based node;
if not, the ground gateway judges whether a channel signal to interference plus noise ratio (SINR) parameter between the user terminal and the base station is larger than a second preset threshold or not, and the ground gateway sends the downlink service data to the base station under the condition that the SINR parameter is larger than the second preset threshold, or sends the downlink service data to a space-based node under the condition that the SINR parameter is smaller than the second preset threshold.
Optionally, before the ground gateway determines whether the mobility parameter of the user side is greater than a first preset threshold, the method further includes:
the ground gateway judges whether the downlink service data is special safety service data;
if yes, the ground gateway sends the downlink service data to a space-based node;
if not, the ground gateway judges whether the mobility parameter of the user side is larger than a first preset threshold value.
Optionally, the space-based node uses a low-orbit satellite with a height of less than 1000 KM.
The invention also provides a device for separating control and service, which is applied to a gateway side, and the device comprises:
the receiving module is used for receiving downlink service data sent by the server;
and the distribution module is used for determining to send the downlink service data to the space-based node or send the downlink service data to the base station according to the mobile state and the transmission channel state of the user side, so that the space-based node or the base station can send the downlink service data to the user side.
Optionally, the receiving module is further configured to:
before receiving downlink service data sent by a server, receiving uplink control signaling sent by each user side and gathered by a base station; sending the uplink control signaling to a space-based node; the space-based node serves as a control party and provides control service for each user side.
Optionally, the distribution module is specifically configured to:
judging whether the mobility parameter of the user side is larger than a first preset threshold value or not; if yes, sending the downlink service data to a space-based node; if not, judging whether the SINR parameter of the channel signal to interference plus noise ratio between the user side and the base station is larger than a second preset threshold value or not, and sending the downlink service data to the base station under the condition that the SINR parameter is larger than the second preset threshold value, or sending the downlink service data to a space-based node under the condition that the SINR parameter is smaller than the second preset threshold value.
Optionally, the distribution module is further configured to:
judging whether the downlink service data is special safety service data or not; if yes, sending the downlink service data to a space-based node; if not, judging whether the mobility parameter of the user side is larger than a first preset threshold value or not.
By adopting the technical scheme, the invention at least has the following advantages:
the method and the device for separating the control and the service, which are disclosed by the invention, take the satellite as a control party, provide wide-area control service for users by utilizing the characteristic of wide satellite coverage, process a control plane by the satellite, and forward the contents of part of service planes by utilizing the characteristic of wide satellite coverage, so that the interference in a ground network can be effectively reduced, the cost of common pilot frequency is reduced, the load of the ground network is reduced, and the spectrum efficiency is improved. The method for separating control and service provided by the invention is adopted in the satellite ground cooperative network to carry out related access control, resource management, bandwidth allocation and dormancy methods, so that the coverage performance and the network energy efficiency of the network can be effectively improved.
Drawings
Fig. 1 is a flowchart of a method for controlling separation of services according to a first embodiment of the present invention;
fig. 2 is a flowchart of a control and service separation method for control plane uplink data according to a second embodiment of the present invention;
fig. 3 is a flowchart of a method for controlling service plane downlink data and separating service according to a second embodiment of the present invention;
fig. 4 is a flowchart illustrating a ground gateway determining a service data trend according to a second embodiment of the present invention;
FIG. 5 is a schematic diagram of a satellite terrestrial cooperative heterogeneous sparse network according to a third embodiment of the present invention;
fig. 6 is a graph illustrating a trade-off relationship between spectrum efficiency and energy efficiency of a satellite terrestrial cooperative network for controlling and separating services according to a third embodiment of the present invention;
FIG. 7 is a diagram of a third embodiment of a satellite terrestrial cooperative heterogeneous dense network according to the present invention;
fig. 8 is a schematic structural diagram of a control and service separation apparatus according to a fourth embodiment of the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.
A first embodiment of the present invention provides a method for separating control and service, as shown in fig. 1, where the method specifically includes the following steps:
step S101: and the ground gateway receives the downlink service data sent by the server.
Specifically, before step S101, the method further includes:
step A1: the ground gateway receives uplink control signaling which is sent by each user side and gathered by the base station;
step A2: the ground gateway sends the uplink control signaling to a space-based node; the space-based node serves as a control party and provides control service for each user side.
Because the satellite load computing capacity of the space-based node is limited, the ground gateway is required to process relevant information, and then the processed information is sent to the space-based node. And because the uplink distance from the user terminal to the space-based node is far, the channel environment is extremely complex, and the transmitting power is limited, control plane signaling and service plane data of each user terminal in the ground communication network are simultaneously routed and integrated to the ground gateway, and then are transmitted to the space-based node through the high-power return of the ground gateway, and then are connected to the network provided by the service content.
Further, the control service includes at least one of: radio bearer control, radio access control, connection mobility control.
The space-based node can be used as an HSS (Home Subscriber Server) to finish the storage of all user subscription information in the coverage area of the whole satellite network; the space-based node can also be used as an MME (Mobility Management Entity) to complete the Mobility signaling interaction of users in the network; the space-based node can also provide an Access security mechanism for an Evolved Universal Radio Access Network (Evolved Universal Terrestrial Radio Access Network).
Step S102: and the ground gateway determines to send the downlink service data to the space-based node or send the downlink service data to the base station according to the mobile state and the transmission channel state of the user side, so that the space-based node or the base station can send the downlink service data to the user side.
Specifically, step S102 includes:
step B1: the ground gateway judges whether the mobility parameter of the user side is larger than a first preset threshold value or not;
if yes, the ground gateway sends the downlink service data to a space-based node; if not, go to step B2;
step B2: the ground gateway judges whether a channel signal to interference plus noise ratio (SINR) parameter between the user side and the base station is larger than a second preset threshold value or not;
if yes, the ground gateway sends the downlink service data to a base station; and if not, the ground gateway sends the downlink service data to the space-based node.
Further, before step B1, the method further includes:
the ground gateway judges whether the downlink service data is special safety service data;
if yes, the ground gateway sends the downlink service data to a space-based node;
if not, the ground gateway judges whether the mobility parameter of the user side is larger than a first preset threshold value.
Furthermore, from the perspective of the user side, since the network frequency band on the ground is basically in the S frequency band (2-3GHz), if the space-based node in the frequency band is used for service, it will be easier to implement that the user side receives control and data information from the space-based node and the ground-based node at the same time.
The space-based node of the embodiment adopts a low-orbit satellite with the height less than 1000 KM. The time delay of the low orbit satellite is relatively small, a large number of spot beams cover the service area of the low orbit satellite, and different spot beams are subjected to interference elimination in a frequency reuse mode. Therefore, the embodiment focuses on the networking characteristics, and does not consider the interference problem between spot beams. The area covered by a certain spot beam needs to be switched among the beams of a plurality of satellites due to the movement of the low-orbit satellite so as to ensure the continuity of the service. Terrestrial slow moving users are almost stationary with respect to the satellite and thus ignore their doppler effect.
In the implementation, a design idea of separating control from service is adopted, and the space-based node and the ground network can be effectively separated in a software-defined mode. The ground base station provides service services for the user terminal, such as dynamic allocation and scheduling of user resources. The ground gateway centrally controls and schedules the control plane signaling traffic and the service plane data traffic, and selects different transmission measurements. The ground gateway may send the aggregated traffic to the space based node or route the aggregated traffic to the ground based node. The space-based node provides control and service for the user side.
A single satellite spot wave beam and a plurality of ground small base stations cooperatively serve users, and frequency division multiplexing is carried out among the satellite spot wave beams to ensure continuous coverage. The satellite can guarantee seamless coverage of the control surface of the network on the control surface, the state and service information of the global user and the base station are obtained by inquiring the home server of the user, and wide area control coverage of the C-plane is provided, so that mobility management is realized. Meanwhile, the satellite can also provide low-speed service for low-speed users (PUEs) with delay tolerance; for example, machine type communication MTC traffic, sensing monitoring, environmental monitoring waiting. The ground network can be used for transmitting low-pass and relatively high-speed service plane contents for common users (SUEs) and time delay sensitive low-speed users; the control plane of these users remains connected to the satellite.
A second embodiment of the present invention provides a method for separating control from service, as shown in fig. 2, where for control plane uplink data, the method specifically includes the following steps:
step S201: and the user side sends an uplink control signaling to the base station.
Step S202: the base station routes the uplink control signaling to the ground gateway.
Step S203: and the ground gateway sends the summarized uplink control signaling to the satellite.
The uplink data of the control plane in the network is sent to the base station by the user side, is routed to the ground gateway through the base station for collection, and is then sent to the satellite by the ground gateway.
As shown in fig. 3, for downlink data of a service plane, the method specifically includes the following steps:
step S301: the core network routes the downlink traffic data to the ground gateway through the backhaul link.
Step S302: the ground gateway judges whether downlink service data are sent to the satellite, if so, step S303 is executed; if not, step S305 is executed.
Step S303: the ground gateway transmits the downlink service data to the satellite.
Step S304: the satellite forwards the downlink service data to the user terminal.
Step S305: and the ground gateway sends the downlink service data to the base station.
Step S306: and the base station sends the downlink service data to the user side.
Step S307: and the user side receives the downlink service data.
Specifically, as shown in fig. 4, step S302 includes the following steps:
step S401: judging whether the downlink service data is special safety service data or not;
if yes, go to step S402; if not, step S403 is executed.
Step S402: and sending the downlink service data to the satellite.
Step S403, judging whether the mobility parameter of the user side is larger than a first preset threshold value;
if yes, go to step S402; if not, go to step S404.
Step S404: judging whether a channel signal to interference plus noise ratio (SINR) parameter between the user side and the base station is larger than a second preset threshold value or not;
if yes, go to step S405; if not, go to step S402.
Step S405: and sending the downlink service data to the base station.
The down data of service plane in the network is sent to the ground gateway by the core network, and the ground gateway judges the information of whether the data is special safety service data (such as military data), whether the receiving user terminal is in high-speed moving state, whether a good transmission channel is provided between the receiving user terminal and the base station, and the like, and determines which service plane contents are transmitted by the base station and which contents are transmitted by the satellite.
In a third embodiment of the present invention, when the method for controlling and separating services in the first embodiment or the second embodiment is applied to a sparse network in satellite ground cooperation, as shown in fig. 5, in the sparse network, the user density is low, the deployment of small base stations is also sparse, and in this scenario, the snr coverage of the network and the overall capacity performance of the network are more concerned. The satellite not only ensures wide coverage of a control plane, but also can assist the ground small base station to realize service plane transmission by utilizing the bandwidth of the satellite.
And the user simultaneously keeps the connection with the control plane and the service plane of the satellite and the ground, and selects the satellite or the ground to realize the data transmission of the service plane. Considering that the core gateway has centralized control capability, the probability of accessing the small base station or the satellite by the user in the service plane is changed by adjusting the received signal power offset value of the ground small base station.
As shown in fig. 6, by designing a centralized resource management method and a distributed resource management method, research is performed on an access control method, so that the relationship between the network coverage probability, the network capacity, the network energy efficiency, the user access bias, the base station transmission power, and the deployment density is obtained theoretically, and the satellite ground cooperative network obtained by verification can effectively improve the network coverage by 70% compared with a network in which control and service are not separated. By reasonably adjusting the transmitting power of the small base station, 3% of spectrum efficiency is sacrificed, and 90% of network energy efficiency can be improved.
When the method for controlling and separating services of the first embodiment or the second embodiment is applied to a dense network of satellite terrestrial cooperation, as shown in fig. 7, in the dense network, due to the dense deployment of small base stations, the signal-to-noise ratio coverage will be better than that in the sparse network, and a faster wireless network service rate can be provided. The quality of service for the user becomes a more important indicator. In the dense network, it is considered to adopt closed access, the human communication user SUE requesting high-speed service and the machine communication service user PUE requesting low-speed service sensitive to time delay are accessed to the ground small base station, while the machine communication service user insensitive to time delay is accessed to the satellite network, and the separation of services is realized based on the control of the gateway.
The satellite mainly provides control plane connection of ground users, and awakens the sleeping base station through the ground gateway in time, so that the small base station can realize appropriate sleeping according to needs.
Research shows that dormancy is a means for effectively improving network energy efficiency in a satellite ground cooperation intensive network, and compared with a network which is not separated, the method can fully utilize wide area coverage performance of a satellite in the satellite ground cooperation network and shut down a base station without a service request (TBM strategy), so that the network energy efficiency can be improved by 85%.
In a fourth embodiment of the present invention, an apparatus for separating control from service is shown in fig. 8, where the system specifically includes the following components:
a receiving module 801, configured to receive downlink service data sent by a server;
the distribution module 802 is configured to determine to send the downlink service data to a space-based node or send the downlink service data to a base station according to the mobile state and the transmission channel state of the user side, so that the space-based node or the base station sends the downlink service data to the user side.
Specifically, the receiving module 801 is further configured to:
before receiving downlink service data sent by a server, receiving uplink control signaling sent by each user side and gathered by a base station; sending the uplink control signaling to a space-based node; the space-based node serves as a control party and provides control service for each user side.
Further, the distribution module 802 is specifically configured to:
judging whether the mobility parameter of the user side is larger than a first preset threshold value or not; if yes, sending the downlink service data to a space-based node; if not, judging whether the SINR parameter of the channel signal to interference plus noise ratio between the user side and the base station is larger than a second preset threshold value or not, and sending the downlink service data to the base station under the condition that the SINR parameter is larger than the second preset threshold value, or sending the downlink service data to a space-based node under the condition that the SINR parameter is smaller than the second preset threshold value.
A distribution module 802, further configured to:
judging whether the downlink service data is special safety service data or not; if yes, sending the downlink service data to a space-based node; if not, judging whether the mobility parameter of the user side is larger than a first preset threshold value.
Furthermore, the space-based nodes adopt low-orbit satellites with the height of less than 1000 KM.
The method and the device for separating control and service, which are introduced in the embodiment of the invention, take the satellite as a control party, provide wide-area control service for users by utilizing the characteristic of wide satellite coverage, deliver the control plane to the satellite for processing, and simultaneously forward the content of part of service plane by utilizing the characteristic of wide satellite coverage, thereby effectively reducing the interference in a ground network, reducing the overhead of common pilot frequency, reducing the load of the ground network and improving the spectrum efficiency. The method for separating control and service provided by the invention is adopted in the satellite ground cooperative network to carry out related access control, resource management, bandwidth allocation and dormancy methods, so that the coverage performance and the network energy efficiency of the network can be effectively improved.
While the invention has been described in connection with specific embodiments thereof, it is to be understood that it is intended by the appended drawings and description that the invention may be embodied in other specific forms without departing from the spirit or scope of the invention.
Claims (8)
1. A method of control and traffic separation, the method comprising:
the ground gateway receives downlink service data sent by a server;
the ground gateway determines to send the downlink service data to a space-based node or send the downlink service data to a base station according to the mobile state and the transmission channel state of the user side, so that the space-based node or the base station can send the downlink service data to the user side;
the ground gateway determines to send the downlink service data to the space-based node or send the downlink service data to the base station according to the mobile state and the transmission channel state of the user side, and the method comprises the following steps:
the ground gateway judges whether the mobility parameter of the user side is larger than a first preset threshold value or not;
if yes, the ground gateway sends the downlink service data to a space-based node;
if not, the ground gateway judges whether a channel signal to interference plus noise ratio (SINR) parameter between the user terminal and the base station is larger than a second preset threshold or not, and the ground gateway sends the downlink service data to the base station under the condition that the SINR parameter is larger than the second preset threshold, or sends the downlink service data to a space-based node under the condition that the SINR parameter is smaller than the second preset threshold.
2. The method of claim 1, wherein before the terrestrial gateway receives downlink traffic data transmitted from a server, the method further comprises:
the ground gateway receives uplink control signaling which is sent by each user side and gathered by the base station;
the ground gateway sends the uplink control signaling to a space-based node; the space-based node serves as a control party and provides control service for each user side.
3. The method of claim 2, wherein the control service comprises at least one of: radio bearer control, radio access control, connection mobility control.
4. The method of claim 1, wherein before the terrestrial gateway determines whether the mobility parameter of the user end is greater than a first preset threshold, the method further comprises:
the ground gateway judges whether the downlink service data is special safety service data;
if yes, the ground gateway sends the downlink service data to a space-based node;
if not, the ground gateway judges whether the mobility parameter of the user side is larger than a first preset threshold value.
5. A method for control and traffic separation according to any of claims 1-4, characterized in that the space-based nodes use low-orbit satellites with a height of less than 1000 KM.
6. An apparatus for control and traffic separation, applied to a gateway side, the apparatus comprising:
the receiving module is used for receiving downlink service data sent by the server;
a distribution module for determining to send the downlink service data to the space-based node or to send the downlink service data to the base station according to the mobile state and the transmission channel state of the user terminal, so that the space-based node or the base station can send the downlink service data to the user terminal,
the distribution module is specifically configured to: judging whether the mobility parameter of the user side is larger than a first preset threshold value or not; if yes, the downlink service data is sent to a space-based node; if not, judging whether the SINR parameter between the user side and the base station is greater than a second preset threshold, and sending the downlink service data to the base station under the condition that the SINR parameter is greater than the second preset threshold, or sending the downlink service data to the space-based node under the condition that the SINR parameter is less than the second preset threshold.
7. The apparatus for controlling separation of traffic according to claim 6, wherein the receiving module is further configured to:
before receiving downlink service data sent by a server, receiving uplink control signaling sent by each user side and gathered by a base station; sending the uplink control signaling to a space-based node; the space-based node serves as a control party and provides control service for each user side.
8. The apparatus for controlling separation of traffic according to claim 6, wherein the distributing module is further configured to:
judging whether the downlink service data is special safety service data or not; if yes, sending the downlink service data to a space-based node; if not, judging whether the mobility parameter of the user side is larger than a first preset threshold value.
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