CN107979406B - Optimized station state management method based on satellite contention channel - Google Patents
Optimized station state management method based on satellite contention channel Download PDFInfo
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- CN107979406B CN107979406B CN201711214778.2A CN201711214778A CN107979406B CN 107979406 B CN107979406 B CN 107979406B CN 201711214778 A CN201711214778 A CN 201711214778A CN 107979406 B CN107979406 B CN 107979406B
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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
- 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
- H04B7/18513—Transmission in a satellite or space-based system
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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
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
Abstract
The invention designs an optimized station state management method based on a satellite contention channel, which is applied to an FDMA satellite communication network, wherein a network management channel uses the network management of a TDM/ALOHA communication system, and the optimized station state management method is provided, so that the effective management of the station state in a satellite communication network is realized. The states of stations in the satellite-to-satellite network can be effectively managed, the station state which needs to be inquired most is polled preferentially according to the optimal inquiry strategy, the condition inquiry information can be effectively prevented from being transmitted in the ALOHA channel at the same time, the utilization rate of the ALOHA channel can be effectively improved, and the accuracy and the real-time performance of station state management can be effectively improved.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a network management technology based on a satellite contention channel, and particularly relates to how to efficiently manage the state of a network management station.
Background
At present, the network management channel of the FDMA satellite communication network in China generally adopts a TDM/ALOHA communication system, a network management center sends forward signaling through the TDM channel, network management stations send return information through the ALOHA channel, and the network management stations contend for the ALOHA channel. The conventional station state management confirms the state of the opposite-end station through the point-to-point query/response message, and performs station state management based on the point-to-point state query result. Under TDM/ALOHA communication system, the network management station contends for ALOHA channel to send return information, when the channel generates conflict, the return signaling can not be sent to the network management center, and the phenomena of false network exit and repeated oscillation of network management station state into the network exit can be generated. Meanwhile, the network management site can send more return information to the ALOHA channel when the network management site repeatedly enters and exits the network, so that the collision probability of the ALOHA channel is increased, and the utilization rate of the ALOHA channel is rapidly deteriorated. Therefore, there is a need for an improved and optimized site status management method for effectively managing the status of the satellite access sites while increasing the utilization rate of the ALOHA channel in consideration of the collision of the ALOHA channel.
Disclosure of Invention
The invention provides an optimized station state management method based on a satellite contention channel, which aims to solve the problem that the network station state of an FDMA communication network based on the contention satellite channel is difficult to manage.
The technical scheme adopted by the invention is as follows:
an optimized station state management method based on a satellite contention channel is suitable for a satellite communication system with the following characteristics:
A. the satellite communication system is an FDMA communication system, and a network management channel adopts a TDM/ALOHA communication system;
B. the network management center uses TDM channel as forward transmission channel, and all network management stations receive network management message from TDM channel;
C. the network management station adopts the ALOHA channel as a return transmission channel, and the network management station contends for the ALOHA channel.
The management of the network management center on the state of the network management station comprises the following steps:
(1) the network management center periodically sends a state notification message through a TDM channel, a network management station analyzes a local state after receiving the state notification message, and if the analyzed local state is a network quitting state, the network management station actively sends a network access application message to the network management center; otherwise, executing the step (3); the state notification message contains the states of all network management stations;
(2) after receiving the network access application message of the network management station, the network management center modifies the state of the network management station into the network access state, and modifies the state of the network management station into the network access state in the state notification message;
(3) the network management center updates the activity time of the network management station after receiving any signaling of the network management station;
(4) the network management center judges whether the network management station quits the network or not according to the activity time of each network management station, if the network management station is judged to be in the network quitting state, the state of the network management station is modified into the network quitting state, and meanwhile, the state of the network management station is modified into the network quitting state in the state notification information;
(5) the network management center calculates the priority of all network management stations in the network access state according to the activity time and the network management station level of all the network management stations in the network access state, sends a state query message to the network management station with the highest priority and waits for receiving the state query response message of the network management station, updates the activity time of the network management station and returns to the step (4); the network management station level is configured by a user;
the management of the network management station to the state of the network management center comprises the following steps:
(6) after receiving the state notification message of the network management center, the network management station judges whether the network management center is in an online state, if so, the activity time of the network management center is updated, otherwise, the state of the network management center is modified into the online state, and meanwhile, a network access application message is sent to the network management center;
(7) and (4) judging whether the difference value between the current time and the activity time of the network management center exceeds a fixed threshold value, if so, modifying the state of the network management center into an off-line state, waiting for receiving a state notification message of the network management center, and returning to the step (6). Otherwise, returning to the step (6). The fixed threshold is configured by a user.
In the step (3), the network management center receives the signaling of the network management station, including the network access application message, the status query response message and other network management service signaling; and the active time of all network management stations in the initial state is the minimum time supported by the system.
Wherein, in the step (4), the activity time of the network management station is TliveThe current time is TcurThe network management center status query message sending interval is delta T, if Tcur-Tlive>n x Δ t, judging that the network management station quits the network; where Δ t and n are set by the user.
In the step (5), the network management center sends the status query message to the network management station with the highest priority level at a fixed time interval, wherein the fixed time interval is set by the user.
Wherein, the step (5) comprises the following steps:
(501) the network management center calculates the priority of all network management stations in the network access state according to the activity time of all network management stations; the network management station level is configured by a user;
(502) the network management center sorts the network management stations in the network access state according to the priority of all the network management stations in the network access state and the level of all the network management stations;
(503) the network management center judges whether the network management station with the highest priority quits the network or not, if so, the station is removed, and the step (502) is returned; otherwise, executing step (504);
(504) the network management center judges whether a state query message needs to be sent to the network management station with the highest current priority, if so, the state query message is sent to the network management station with the highest current priority, and the active time of the network management station is updated; otherwise, returning to the step (501).
In step (501), the priority calculation method includes: the activity time of the network management station is TliveThe current time is TcurThe network management station has a level of L and a priority of Tl＝Tcur-Tlive(ii) a If the network management station priority TlAnd if the values are the same, the higher the value of the network management station level L is, the higher the priority is, wherein L is set by a user.
Wherein, the step (503) of the network management center judging whether the state query message needs to be sent to the network management station with the highest priority level specifically comprises: the sending interval of the state inquiry information sent by the network management center to the network management station is delta T, if the priority level T of the network management stationl<Delta t, the status query message is not required to be sent to the network management station; where Δ t is set by the user.
Compared with the prior art, the invention has the following beneficial effects:
the states of stations in the satellite-to-satellite network can be effectively managed, the station state which needs to be inquired most is polled preferentially according to the optimal inquiry strategy, the condition inquiry information can be effectively prevented from being transmitted in the ALOHA channel at the same time, the utilization rate of the ALOHA channel can be effectively improved, and the accuracy and the real-time performance of station state management can be effectively improved.
Drawings
FIG. 1 is a schematic diagram of an application scenario of the present invention;
FIG. 2 is a flow chart of message processing of the network management center of the present invention;
FIG. 3 is a flow chart of message processing of the network management station of the present invention;
FIG. 4 is a flow chart of the site query selection process of the present invention.
Detailed Description
The invention is further described below with reference to fig. 1-4.
In order to implement the present invention, a secondary structure satellite communication network is provided as an application scenario, which includes a network management center and a network management station, as shown in fig. 1.
An optimized station state management method based on an FDMA satellite communication system manages the state of a communication station by adopting mechanisms such as state polling, return keep-alive, optimized query and the like, and a network management center manages the state of a network management station and comprises the following steps:
the management of the network management center on the state of the network management station comprises the following steps:
(1) the network management center periodically sends a state notification message through a TDM channel, a network management station analyzes a local state after receiving the state notification message, and if the analyzed local state is a network quitting state, the network management station actively sends a network access application message to the network management center; otherwise, executing the step (3); the state notification message contains the states of all network management stations;
(2) as shown in the flowchart of fig. 2, after receiving the message of the network management station, the network management center determines whether the message is a network access application message, if so, modifies the state of the network management station to be a network access state, and modifies the state of the network management station to be a network access state in the state notification message; otherwise, updating the activity time of the network management station;
(3) the network management center updates the activity time of the network management station after receiving any signaling of the network management station; the arbitrary signaling comprises a network access application message, a state query response message and other network management service signaling; and the active time of all network management stations in the initial state is the minimum time supported by the system.
(4) The network management center judges whether the network management station quits the network according to the activity time of each network management station, if so, the network management station is judgedIn the network quitting state, modifying the state of the network management station into the network quitting state, and modifying the state of the network management station into the network quitting state in the state announcement information; the specific steps of judging whether the network management station quits the network are as follows: the activity time of the network management station is TliveThe current time is TcurThe network management center status query message sending interval is delta T, if Tcur-Tlive>n x Δ t, judging that the network management station quits the network; where Δ t and n are set by the user.
(5) The network management center calculates the priority of all network management stations in the network access state according to the activity time and the network management station level of all the network management stations in the network access state, sends a state query message to the network management station with the highest priority at a fixed time interval, waits for receiving the state query response message of the network management station, updates the activity time of the network management station, and returns to the step (4); the network management station level is configured by a user; the network management station level is configured by a user;
the management of the network management station to the state of the network management center comprises the following steps:
(6) as shown in the flowchart of fig. 3, after receiving a status notification message of a network management center, if the status notification message is in a network access status, the network management station determines whether the network management center is in an online status, if so, the activity time of the network management center is updated, otherwise, the status of the network management center is modified into the online status, and meanwhile, a network access application message is sent to the network management center; if the network is not in the network access state, sending a network access application message to the network management center and updating the activity time of the network management center; the network management center can send a state query message to the network management station periodically, the network management station returns a corresponding state query message, and the activity time of the network management center is updated according to the received state query message;
(7) and (4) the network management station judges whether the difference value between the current time and the activity time of the network management center exceeds a fixed threshold value, if so, the state of the network management center is modified into an off-line state, a state notification message of the network management center is waited to be received, and the step (6) is returned. Otherwise, returning to the step (6). The fixed threshold is configured by a user.
Wherein, the step (5) comprises the following steps: as shown in fig. 4;
(501) the network management center calculates the priority of all network management stations in the network access state according to the activity time of all network management stations; the network management station level is configured by a user;
(502) the network management center sorts the network management stations in the network access state according to the priority of all the network management stations in the network access state and the level of all the network management stations and takes out the head station of the queue;
(503) the network management center judges whether the network management station with the highest current priority is taken out, if so, the station is removed, and the step (502) is returned; otherwise, executing step (504);
(504) the network management center judges whether a state query message needs to be sent to the network management station with the highest current priority, if so, the state query message is sent to the network management station with the highest current priority, and the active time of the network management station is updated; otherwise, returning to the step (501).
In step (501), the priority calculation method includes: the activity time of the network management station is TliveThe current time is TcurThe network management station has a level of L and a priority of Tl＝Tcur-Tlive(ii) a If the network management station priority TlAnd if the values are the same, the higher the value of the network management station level L is, the higher the priority is, wherein L is set by a user.
Wherein, the step (503) of the network management center judging whether the state query message needs to be sent to the network management station with the highest priority level specifically comprises: the sending interval of the state inquiry information sent by the network management center to the network management station is delta T, if the priority level T of the network management stationl<Delta t, the status query message is not required to be sent to the network management station; where Δ t is set by the user.
The embodiments of the present invention originally create an optimized station state management method based on a satellite contention channel, effectively improve the utilization rate of an ALOHA channel, and improve the management efficiency and accuracy of the station state in a satellite communication network.
Those of ordinary skill in the art will understand that: implementing a satellite contention channel based station state management method may be accomplished by hardware or software in association with program instructions that, when executed, perform steps comprising the above-described method embodiments.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that modifications may be made to the above embodiments, or equivalent substitutions and modifications may be made to other features of the embodiments, and any modifications, equivalents, improvements, etc. within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A optimized station state management method based on a satellite contention channel manages the state of a communication station by adopting a state polling mechanism, a return keep-alive mechanism and an optimized query mechanism, and is characterized in that:
the management of the network management center on the state of the network management station comprises the following steps:
(1) the network management center periodically sends a state notification message through a TDM channel, a network management station analyzes a local state after receiving the state notification message, and if the analyzed local state is a network quitting state, the network management station actively sends a network access application message to the network management center; otherwise, executing the step (3); the state notification message contains the states of all network management stations;
(2) after receiving the network access application message of the network management station, the network management center modifies the state of the network management station into the network access state, and modifies the state of the network management station into the network access state in the state notification message;
(3) the network management center updates the activity time of the network management station after receiving any signaling of the network management station;
(4) the network management center judges whether the network management station quits the network or not according to the activity time of each network management station, if the network management station is judged to be in the network quitting state, the state of the network management station is modified into the network quitting state, and meanwhile, the state of the network management station is modified into the network quitting state in the state notification message;
(5) the network management center calculates the priority of all the network management stations in the network access state according to the activity time and the network management station level of all the network management stations in the network access state, sends a state query message to the network management station with the highest priority and sends the state query message to the network management station with the highest priorityWaiting for receiving the status inquiry response message of the network management station, updating the activity time of the network management station, and returning to the step (4); the network management station level is configured by a user; the calculation method of the priority comprises the following steps: the activity time of the network management station is TliveThe current time is TcurThe network management station has a level of L and a priority of Tl＝Tcur-Tlive(ii) a If the network management station priority TlIf the values are the same, the higher the value of the network management station level L is, the higher the priority is, wherein L is set by a user;
the management of the network management station to the state of the network management center comprises the following steps:
(6) after receiving the state notification message of the network management center, the network management station judges whether the network management center is in an online state, if so, the activity time of the network management center is updated, otherwise, the state of the network management center is modified into the online state, and meanwhile, a network access application message is sent to the network management center;
(7) the network management station judges whether the difference value between the current time and the activity time of the network management center exceeds a fixed threshold value, if so, the state of the network management center is modified into an off-line state, a state notification message of the network management center is waited to be received, and the step (6) is returned; otherwise, returning to the step (6); the fixed threshold is configured by a user.
2. The method of claim 1, wherein the station state management is based on a satellite contention channel, and comprises: in the step (3), the network management center receives the signaling of the network management station, including the network access application message, the state query response message and other network management service signaling; and the active time of all network management stations in the initial state is the minimum time supported by the system.
3. The method of claim 1, wherein the station state management is based on a satellite contention channel, and comprises: the step (4) of judging whether the network management station quits the network specifically comprises the following steps: the activity time of the network management station is TliveThe current time is TcurThe network management center status query message sending interval is delta T, if Tcur-Tlive>n x Δ t, judging that the network management station quits the network; where Δ t and n are by the userAnd (4) setting.
4. The method of claim 1, wherein the station state management is based on a satellite contention channel, and comprises: in the step (5), the network management center sends the status query message to the network management station with the highest priority level at a fixed time interval, wherein the fixed time interval is set by the user.
5. The method of claim 1, wherein the station state management is based on a satellite contention channel, and comprises: the step (5) comprises the following steps:
(501) the network management center calculates the priority of all network management stations in the network access state according to the activity time of all network management stations; the network management station level is configured by a user;
(502) the network management center sorts the network management stations in the network access state according to the priority of all the network management stations in the network access state and the level of all the network management stations;
(503) the network management center judges whether the network management station with the highest priority quits the network or not, if so, the station is removed, and the step (502) is returned; otherwise, executing step (504);
(504) the network management center judges whether a state query message needs to be sent to the network management station with the highest current priority, if so, the state query message is sent to the network management station with the highest current priority, and the active time of the network management station is updated; otherwise, returning to the step (501).
6. The method of claim 5, wherein the station state management is based on a contention channel of a satellite, and comprises: the step (503) of the network management center determining whether it is necessary to send the status query message to the network management station with the highest priority specifically includes: the sending interval of the state inquiry information sent by the network management center to the network management station is delta T, if the priority level T of the network management stationl<Delta t, the status query message is not required to be sent to the network management station; where Δ t is set by the user.
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