CN114884564B - Improved superframe sequence distribution method and communication system based on DVB-RCS2 protocol - Google Patents
Improved superframe sequence distribution method and communication system based on DVB-RCS2 protocol Download PDFInfo
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- CN114884564B CN114884564B CN202210548620.3A CN202210548620A CN114884564B CN 114884564 B CN114884564 B CN 114884564B CN 202210548620 A CN202210548620 A CN 202210548620A CN 114884564 B CN114884564 B CN 114884564B
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- 230000003993 interaction Effects 0.000 claims description 9
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
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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
- H04B7/18578—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
- 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
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Abstract
The invention provides an improved superframe sequence distribution method and a communication system based on DVB-RCS2 protocol, wherein the superframe sequence distribution method comprises the following steps: the SCT table size is reduced by separating allocation opportunities for the control channel superframe sequence and the traffic channel superframe sequence. The invention can realize broadcasting the control channel super frame sequence only in the SCT list by separating the allocation time of the control channel super frame sequence and the service channel super frame sequence, and the special service channel super frame sequence of the satellite terminal is sent to the satellite terminal through the TIM-U message after the satellite terminal completes the fine synchronization, thereby reducing the size of the SCT list, improving the utilization rate of the broadcast resource 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 distribution method and a communication system based on DVB-RCS2 protocol.
Background
All the superframe sequences including the reverse control channels and the traffic channels in the DVB-RCS2 protocol are periodically transmitted to the terminals in the form of broadcasting through SCT (Superframe Composition Table ) tables. With the development of low-orbit satellite communication, the more regions or countries a satellite needs to serve, the more frequencies the satellite needs to support, the more corresponding superframe sequences, and the more superframe sequences are, the larger the SCT table is, so that the more occupied broadcast channel resources are occupied, and the terminal is doing business by using only one or a few superframe sequences, which causes the waste of broadcast channel resources of the 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 distribution method and a communication system based on a DVB-RCS2 protocol, which are used for solving 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 issued 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 SCT table size is reduced by separating allocation opportunities for the control channel superframe sequence and the traffic channel superframe sequence.
Further, the method for separating the allocation occasion of the control channel superframe sequence and the traffic channel superframe sequence includes:
enabling the SCT table to only contain a control channel superframe sequence so as to enable the satellite terminal to log in and finely synchronize;
and the super frame sequence of the service channel is allocated after the satellite terminal is precisely synchronized.
Further, the method for allocating the service channel superframe sequence after the satellite terminal is precisely synchronized comprises the following steps:
and forming a descriptor by the service channel superframe sequence allocated to the satellite terminal, and sending the descriptor to the satellite terminal 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, a base station only broadcasts a control channel super frame sequence to a satellite terminal through an SCT table in forward link broadcasting, so that the satellite terminal can log in and finely synchronize;
s2, the satellite terminal logs in by sending login PDU in login time slot through control channel superframe sequence in SCT table;
s3, the base station responds to the login PDU of the satellite terminal through the TIM-U message, and simultaneously, control resources for fine synchronization are allocated to the satellite terminal;
and S4, after the satellite terminal achieves the precise synchronization, the base station distributes a service channel super frame sequence for the satellite terminal, forms a descriptor for the service channel super frame sequence distributed for the satellite terminal, and sends the descriptor to the satellite terminal in a unicast mode through a TIM-U message so as to be used for subsequent procedures by the satellite terminal.
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 beneficial effects of the invention are as follows:
the invention can realize broadcasting the control channel super frame sequence only in the SCT list by separating the allocation time of the control channel super frame sequence and the service channel super frame sequence, and the special service channel super frame sequence of the satellite terminal is sent to the satellite terminal through the TIM-U message after the satellite terminal completes the fine synchronization, thereby reducing the size of the SCT list, improving the utilization rate of the broadcast resource 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 following description will briefly describe the drawings in the embodiments, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a signaling interaction flow diagram defined by the DVB-RCS2 protocol.
Fig. 2 is a signaling interaction flow chart of an improved superframe sequence allocation method based on the DVB-RCS2 protocol according to the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the 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 invention, as 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 made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
As shown in fig. 1, the signaling interaction procedure defined by the DVB-RCS2 protocol is as follows:
the base station broadcasts all control channel super frame sequences and service channel super frame sequences under the base station to the satellite terminal through the SCT table; the satellite terminal selects a super frame sequence according to a certain rule, logs in on a login time slot defined by the super frame sequence, and after the satellite terminal achieves fine synchronization, the base station informs the satellite terminal of a service channel super frame sequence number used by the satellite terminal through a TIM-U message, and the satellite terminal finds a corresponding super frame sequence in an SCT table according to the super frame sequence number for use in a subsequent process.
Based on this, the embodiment provides an improved superframe sequence allocation method based on the DVB-RCS2 protocol, aiming at the problem of resource waste of a base station broadcast channel caused by the periodic transmission of all superframe sequences in the DVB-RCS2 protocol in a broadcast mode through SCT. The superframe sequence allocation method comprises the following steps:
the SCT table is reduced by separating the allocation time of the control channel super frame sequence and the service channel super frame sequence (the more the service channel super frame sequence planned by the communication system is, the more obvious the effect is), the broadcast channel resource is 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 for processing the signaling is reduced.
Specifically, the method for separating the allocation occasion of the control channel superframe sequence and the traffic channel superframe sequence includes:
enabling the SCT table to only contain a control channel superframe sequence so as to enable the satellite terminal to log in and finely synchronize;
and the super frame sequence of the service channel is allocated after the satellite terminal is precisely synchronized. Preferably, the allocation method is as follows:
and forming a descriptor by the service channel superframe sequence allocated to the satellite terminal, and sending the descriptor to the satellite terminal through the TIM-U message. Typically, the TIM-U message carrying the descriptor is sent to the satellite terminals 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 terminals;
superframe_sequence: a superframe sequence ID for indicating allocation to the satellite terminal;
superframe_count: this 16-bit field gives the superframe count value of the reference superframe corresponding to the start time;
superframe_start_time_base and superframe_start_time_ext: these two fields give the absolute start time of the super frame_count numbered super frame in the super frame sequence (reference NCR), reference NCR value closest in time to the currently received NCR value. The field code is the same as the NCR code and corresponds to a basic part and an extension part of the NCR respectively;
superframe_duration: this 32-bit field gives the duration of each superframe of the superframe sequence according to NCR count;
super frame_centre_frequency: this 32-bit field gives the absolute center frequency of the superframe sequence;
superframe_count: this 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 j-th 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 a signed offset value of the center frequency of the jth frame relative to the superframe center frequency parameter (superframe_center_frequency).
Thus, after the above superframe sequence allocation method is adopted, as shown in fig. 2, the signaling interaction flow is as follows:
s1, a base station only broadcasts a control channel super frame sequence to a satellite terminal through an SCT table in forward link broadcasting, so that the satellite terminal can log in and finely synchronize;
s2, the satellite terminal logs in by sending login PDU in login time slot through control channel superframe sequence in SCT table;
s3, the base station responds to the login PDU of the satellite terminal through the TIM-U message, and simultaneously, control resources for fine synchronization are allocated to the satellite terminal;
and S4, after the satellite terminal achieves the precise synchronization, the base station distributes a service channel super frame sequence for the satellite terminal, forms a descriptor for the service channel super frame sequence distributed for the satellite terminal, and sends the descriptor to the satellite terminal in a unicast mode through a TIM-U message so as to be used for subsequent procedures by the satellite terminal.
Example 2
The embodiment provides a communication system using DVB-RCS2 protocol, which comprises 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, namely:
s1, a base station only broadcasts a control channel super frame sequence to a satellite terminal through an SCT table in forward link broadcasting, so that the satellite terminal can log in and finely synchronize;
s2, the satellite terminal logs in by sending login PDU in login time slot through control channel superframe sequence in SCT table;
s3, the base station responds to the login PDU of the satellite terminal through the TIM-U message, and simultaneously, control resources for fine synchronization are allocated to the satellite terminal;
and S4, after the satellite terminal achieves the precise synchronization, the base station distributes a service channel super frame sequence for the satellite terminal, forms a descriptor for the service channel super frame sequence distributed for the satellite terminal, and sends the descriptor to the satellite terminal in a unicast mode through a TIM-U message so as to be used for subsequent procedures by the satellite terminal.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. An improved superframe sequence allocation method based on DVB-RCS2 protocol, characterized in that the superframe sequence allocation method comprises:
reducing the size of the SCT table by separating allocation opportunities of the control channel superframe sequence and the traffic channel superframe sequence;
the method for separating the allocation occasion of the control channel super frame sequence and the service channel super frame sequence comprises the following steps:
enabling the SCT table to only contain a control channel superframe sequence so as to enable the satellite terminal to log in and finely synchronize;
the super frame sequence of the service channel is distributed after the satellite terminal is precisely synchronized; the method for distributing the service channel superframe sequence after the satellite terminal is precisely synchronized comprises the following steps:
forming a descriptor by a service channel superframe sequence distributed for a satellite terminal, and sending the descriptor to the satellite terminal through a TIM-U message; transmitting the TIM-U message carrying the descriptor to a satellite terminal in a unicast mode;
after the superframe sequence allocation method is adopted, the signaling interaction flow is as follows:
s1, a base station only broadcasts a control channel super frame sequence to a satellite terminal through an SCT table in forward link broadcasting, so that the satellite terminal can log in and finely synchronize;
s2, the satellite terminal logs in by sending login PDU in login time slot through control channel superframe sequence in SCT table;
s3, the base station responds to the login PDU of the satellite terminal through the TIM-U message, and simultaneously, control resources for fine synchronization are allocated to the satellite terminal;
and S4, after the satellite terminal achieves the precise synchronization, the base station distributes a service channel super frame sequence for the satellite terminal, forms a descriptor for the service channel super frame sequence distributed for the satellite terminal, and sends the descriptor to the satellite terminal in a unicast mode through a TIM-U message so as to be used for subsequent procedures by the satellite terminal.
2. A communication system using DVB-RCS2 protocol, wherein the communication system comprises 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 claim 1.
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