CN114884564A - Improved superframe sequence distribution method based on DVB-RCS2 protocol and communication system - Google Patents
Improved superframe sequence distribution method based on DVB-RCS2 protocol and communication system Download PDFInfo
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- 238000004891 communication Methods 0.000 title claims abstract description 13
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- H—ELECTRICITY
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- 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
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
- H04B7/18582—Arrangements for data linking, i.e. for data framing, for error recovery, for multiple access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
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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
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- 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
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Abstract
The invention provides an improved superframe sequence distribution method and a communication system based on a DVB-RCS2 protocol, wherein the superframe sequence distribution method comprises the following steps: the size of the SCT table is reduced by separating the allocation time of the control channel superframe sequence and the traffic channel superframe sequence. The invention can realize that the control channel superframe sequence is only broadcasted in the SCT table by separating the allocation time of the control channel superframe sequence and the service channel superframe sequence, and the service channel superframe sequence special for the satellite terminal is sent to the satellite terminal through TIM-U information after the satellite terminal completes the fine synchronization, thereby reducing the size of the SCT table, improving the utilization rate of the broadcast resources of the base station, simultaneously, the satellite terminal only processes the information related to the satellite terminal, and reducing the complexity of the satellite terminal for processing the signaling.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an improved superframe sequence allocation method and a communication system based on a DVB-RCS2 protocol.
Background
All the Superframe sequences including the reverse control channel and the traffic channel in the DVB-RCS2 protocol are periodically sent to the terminal in a broadcast form through an SCT (super frame Composition Table) Table. With the development of low-earth orbit satellite communication, the more areas or countries to be served by a satellite, the more frequencies the satellite needs to support, the more corresponding superframe sequences are, the more superframe sequences are, and the larger SCT tables are, so that the more broadcast channel resources are occupied, and a terminal only uses one or a few superframe sequences when doing business, which causes waste of broadcast channel resources of a base station, reduces the resource utilization rate of the base station, and also reduces the processing efficiency of the terminal.
Disclosure of Invention
The invention aims to provide an improved superframe sequence allocation method and a communication system based on a DVB-RCS2 protocol, which aim to solve the problem of resource waste of a base station broadcast channel caused by the fact that all superframe sequences in the DVB-RCS2 protocol are periodically transmitted in a broadcast mode through SCT.
The invention provides an improved superframe sequence allocation method based on DVB-RCS2 protocol, which comprises the following steps:
the size of the SCT table is reduced by separating the allocation time of the control channel superframe sequence and the traffic channel superframe sequence.
Further, the method for separating allocation occasions of the control channel superframe sequence and the traffic channel superframe sequence includes:
making the SCT table only contain a control channel superframe sequence for the satellite terminal to log in and carry out fine synchronization;
and the service channel superframe sequence is distributed after being precisely synchronized at the satellite terminal.
Further, the method for allocating the service channel superframe sequence after the service channel superframe sequence is precisely synchronized at the satellite terminal comprises the following steps:
and forming a descriptor by the service channel superframe sequence distributed for the satellite terminal, and sending the descriptor to the satellite terminal by carrying the descriptor through the TIM-U message.
Further, the TIM-U message carrying the descriptor is sent to the satellite terminal in a unicast mode.
Further, after the superframe sequence allocation method is adopted, the signaling interaction flow is as follows:
s1, the base station broadcasts the control channel superframe sequence to the satellite terminal through SCT table in the forward link broadcast for the satellite terminal to log in and fine synchronize;
s2, the satellite terminal logs in by sending login PDU in the login time slot through the control channel superframe sequence in the SCT table;
s3, the base station responds to the logging PDU of the satellite terminal through the TIM-U message, and meanwhile, the base station distributes control resources for fine synchronization to the satellite terminal;
and S4, when the satellite terminal achieves fine synchronization, the base station distributes a service channel superframe sequence for the satellite terminal, the service channel superframe sequence distributed for the satellite terminal forms a descriptor, and the descriptor is carried by the TIM-U message and sent to the satellite terminal in a unicast mode for the satellite terminal to use in the subsequent process.
The invention also provides a communication system using DVB-RCS2 protocol, which comprises a base station and a satellite terminal;
and the base station and the satellite terminal perform signaling interaction after adopting the superframe sequence allocation method.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention can realize that the control channel superframe sequence is only broadcasted in the SCT table by separating the allocation time of the control channel superframe sequence and the service channel superframe sequence, and the service channel superframe sequence special for the satellite terminal is sent to the satellite terminal through TIM-U information after the satellite terminal completes the fine synchronization, thereby reducing the size of the SCT table, improving the utilization rate of the broadcast resources of the base station, simultaneously, the satellite terminal only processes the information related to the satellite terminal, and reducing the complexity of the satellite terminal for processing the signaling.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flow chart of signaling interaction defined by the DVB-RCS2 protocol.
Fig. 2 is a signaling interaction flow diagram of an improved superframe sequence allocation method based on the DVB-RCS2 protocol according to the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
As shown in fig. 1, the signaling interaction flow defined by the DVB-RCS2 protocol is as follows:
the base station broadcasts all control channel superframe sequences and service channel superframe sequences under the base station to the satellite terminal through the SCT table; the satellite terminal selects a superframe sequence according to a certain rule, logs in on a login time slot defined by the superframe sequence, after the satellite terminal achieves fine synchronization, the base station informs the satellite terminal of a service channel superframe sequence number used by the satellite terminal through TIM-U information, and the satellite terminal finds a corresponding superframe sequence in an SCT table according to the superframe sequence number for use in a subsequent process.
Based on this, the present embodiment provides an improved method for allocating superframe sequences based on the DVB-RCS2 protocol, which is directed to the problem of resource waste of a broadcast channel of a base station caused by periodically issuing all superframe sequences in the DVB-RCS2 protocol in a broadcast form through SCT. The superframe sequence allocation method comprises the following steps:
the size of the SCT table is reduced by separating the allocation time of the control channel superframe sequence and the service channel superframe sequence (the more the service channel superframe sequences planned by the communication system are, the more the effect is obvious), the broadcast channel resources are saved, the resource utilization rate of the base station broadcast channel is improved, meanwhile, the satellite terminal only processes the information related to the satellite terminal, and the complexity of the satellite terminal in processing the signaling is reduced.
Specifically, the method for separating allocation occasions of the control channel superframe sequence and the traffic channel superframe sequence includes:
making the SCT table only contain a control channel superframe sequence for the satellite terminal to log in and carry out fine synchronization;
and the service channel superframe sequence is distributed after being precisely synchronized at the satellite terminal. Preferably, the distribution method comprises the following steps:
and forming a descriptor by the service channel superframe sequence distributed for the satellite terminal, and sending the descriptor to the satellite terminal by carrying the descriptor through the TIM-U message. Typically, the TIM-U message carrying the descriptor is sent to the satellite terminal in unicast. The descriptors are shown in table 1.
Table 1, descriptor of composition:
in table 1:
wherein:
-superframe _ loop _ count: indicating the number of superframe sequences allocated to the satellite terminal;
-superframe _ sequence: a superframe sequence ID for indicating allocation to the satellite terminal;
-superframe _ count: the 16-bit field gives the superframe count value of the reference superframe corresponding to the start time;
-super frame _ start _ time _ base and super frame _ start _ time _ ext: these two fields give the absolute start time (reference NCR) of the superframe numbered superframe _ count in the superframe sequence, referring to the NCR value closest in time to the currently received NCR value. The field code is the same as the NCR code and respectively corresponds to the base part and the extension part of the NCR;
-superframe _ duration: this 32-bit field gives the duration of each superframe of the superframe sequence according to the NCR count;
-superframe _ center _ frequency: this 32-bit field gives the absolute center frequency of the superframe sequence;
-superframe _ count: the 16-bit field gives the superframe count value of the reference superframe corresponding to the start time;
frame _ loop _ count: the value of this 5-bit field is the number of iterations of the following loop minus 1. A zero count indicates one cycle;
frame _ type: this 8-bit field gives the frame type identification of the jth frame corresponding to the frame type defined in the FCT;
frame _ start _ time: this 32-bit field gives the start time of the jth frame relative to the superframe start time;
frame _ centre _ frequency _ offset: this 24-bit field gives the signed offset value of the center frequency of the jth frame relative to the superframe center frequency parameter (superframe _ center _ frequency).
Therefore, after the superframe sequence allocation method is adopted, as shown in fig. 2, the signaling interaction flow is as follows:
s1, the base station broadcasts the control channel superframe sequence to the satellite terminal through SCT table in the forward link broadcast for the satellite terminal to log in and fine synchronize;
s2, the satellite terminal logs in by sending login PDU in the login time slot through the control channel superframe sequence in the SCT table;
s3, the base station responds to the logging PDU of the satellite terminal through the TIM-U message, and meanwhile, the base station distributes control resources for fine synchronization to the satellite terminal;
and S4, when the satellite terminal achieves fine synchronization, the base station distributes a service channel superframe sequence for the satellite terminal, the service channel superframe sequence distributed for the satellite terminal forms a descriptor, and the descriptor is carried by the TIM-U message and sent to the satellite terminal in a unicast mode for the satellite terminal to use in the subsequent process.
Example 2
The present embodiment provides a communication system using the DVB-RCS2 protocol, the communication system comprising a base station and a satellite terminal;
the base station and the satellite terminal perform signaling interaction after adopting the superframe sequence allocation method as described in embodiment 1, that is:
s1, the base station broadcasts the control channel superframe sequence to the satellite terminal through SCT table in the forward link broadcast for the satellite terminal to log in and fine synchronize;
s2, the satellite terminal logs in by sending login PDU in the login time slot through the control channel superframe sequence in the SCT table;
s3, the base station responds to the logging PDU of the satellite terminal through the TIM-U message, and meanwhile, the base station distributes control resources for fine synchronization to the satellite terminal;
and S4, when the satellite terminal achieves fine synchronization, the base station distributes a service channel superframe sequence for the satellite terminal, the service channel superframe sequence distributed for the satellite terminal forms a descriptor, and the descriptor is carried by the TIM-U message and sent to the satellite terminal in a unicast mode for the satellite terminal to use in the subsequent process.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An improved superframe sequence allocation method based on DVB-RCS2 protocol, characterized in that the superframe sequence allocation method comprises:
the size of the SCT table is reduced by separating the allocation time of the control channel superframe sequence and the traffic channel superframe sequence.
2. The improved superframe sequence allocation method according to the DVB-RCS2 protocol, wherein the method for separating allocation occasions of the control channel superframe sequence and the traffic channel superframe sequence comprises:
making the SCT table only contain a control channel superframe sequence for the satellite terminal to log in and carry out fine synchronization;
and the service channel superframe sequence is distributed after being precisely synchronized at the satellite terminal.
3. The DVB-RCS2 protocol based improved superframe sequence allocation method according to claim 2, wherein the method for allocating the service channel superframe sequence after fine synchronization of the satellite terminal comprises:
and forming a descriptor by the service channel superframe sequence distributed for the satellite terminal, and sending the descriptor carried by the TIM-U message to the satellite terminal.
4. The improved method for superframe sequence allocation according to DVB-RCS2 protocol, according to claim 3, wherein the TIM-U message carrying the descriptor is sent in unicast to the satellite terminal.
5. The improved method for allocating superframe sequence based on DVB-RCS2 protocol according to claim 4, wherein after the method for allocating superframe sequence is adopted, the signaling interaction flow is as follows:
s1, the base station broadcasts the control channel superframe sequence to the satellite terminal through SCT table in the forward link broadcast for the satellite terminal to log in and fine synchronize;
s2, the satellite terminal logs in by sending login PDU in the login time slot through the control channel superframe sequence in the SCT table;
s3, the base station responds to the logging PDU of the satellite terminal through the TIM-U message, and meanwhile, the base station distributes control resources for fine synchronization to the satellite terminal;
and S4, when the satellite terminal achieves fine synchronization, the base station distributes a service channel superframe sequence for the satellite terminal, the service channel superframe sequence distributed for the satellite terminal forms a descriptor, and the descriptor is carried by the TIM-U message and sent to the satellite terminal in a unicast mode for the satellite terminal to use in the subsequent process.
6. A communication system using the DVB-RCS2 protocol, the communication system comprising a base station and a satellite terminal;
the base station and the satellite terminal perform signaling interaction after adopting the superframe sequence allocation method according to any one of claims 1 to 5.
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