CN103249156B - Method for allocating satellite network channels - Google Patents
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Abstract
The invention discloses a method for allocating satellite network channels. The method comprises the steps as follows: GEO (geosychronons earth orbit) satellites are used for allocating channels for a plurality of waiting-in-line LEO (low earth orbit) satellites according to an FIFO (first in first out) principle; for LEO satellites sending call requests simultaneously, the GEO satellites allocate channels sequentially according to priority levels of the LEO satellite; the LEO satellites subjected to wave beam conversion utilize the channels in sequence of a common competitive channel and a reserved channel; and after the common competitive channel is used up, new-calling LEO satellites determine and use the reserved channels by a forcible occupy method. According to the method for allocating the satellite network channels, during satellite data communication, the GEO satellites can reasonably arrange the channels for the LEO satellites, so that the channels in the area covered by the GEO satellites can be utilized sufficiently, the LEO satellites receive the channels sequentially, and the normal operation of communication transmission is guaranteed.
Description
Technical field
The present invention relates to technical field of satellite communication, relate to the signal transmission form between high rail satellite and low orbit satellite, relate in particular to a kind of method for channel allocation of satellite network.
Background technology
Satellite communication has broad covered area, is not subject to the advantage of ground infrastructure restriction, the application of satellite communication is at present more and more extensive, especially in recent years the frequent natural calamity such as earthquake, floods occurs, ground equipment wired and wireless network damages in disaster, cause communication disruption when running into disaster, the condition of a disaster cannot transmit in time, incurs loss through delay the disaster relief.For this reason, increasing country adopts low orbit satellite to carry out the observations such as environment, geology, resource, to guarantee that information can effectively be transmitted when there is the condition of a disaster.In satellite network, due to the fast moving of low orbit satellite, the visual time of each period of motion and ground station is extremely limited, in order to guarantee the real-time transmitting of data, when low orbit satellite and ground station are when not visible, will carry out data retransmission by high rail satellite.As shown in Figure 1: the simulation drawing of transfer of data between high rail satellite and low orbit satellite, as can be seen from the figure: three high rail satellites just can complete except the data communication in the Global coverage region of south poles, in low orbit satellite motion process, will there is moving to from Yi Gegaogui satellite coverage another Ke Gaogui satellite coverage, because the channel quantity of high rail satellite is limited, the track of low orbit satellite operation is different, low orbit satellite quantity in Ge Gaogui satellite coverage is also by dynamic change, when low orbit satellite discharges a channel, need to ask another high rail satellite to arrange next channel for it, in data communication, low orbit satellite needs to carry out the conversion between wave beam in the overlay area of a high rail satellite, carrying out needing equally high rail satellite reasonably for it arranges channel when wave beam switches, thereby improve resource utilization ratio problem.In prior art, do not provide satellite and when carrying out data communication, how to seize channel and how to add up to the method that arranges and use channel, cause when satellite communication, data transmission efficiency is low, the phenomenon that resource is not used appropriately.
Summary of the invention
The problem existing according to prior art, the invention discloses a kind of satellite network method for channel allocation, has the following steps:
Step 1: high rail satellite is a plurality of low orbit satellite allocated channels of waiting in line according to first-in first-out FIFO principle, and to send the low orbit satellite of call request simultaneously, high rail satellite is just followed successively by its allocated channel according to the priority of low orbit satellite;
Step 2: be channel reservation and common competitive channel by the channel distribution in the wave beam of high rail satellite;
The low orbit satellite that carries out wave beam switching is used channel successively according to the order of first common competitive channel, rear channel reservation, after common competitive channel is finished using, newly calls out low orbit satellite and uses channel reservation according to conversion method; Described conversion method is as follows:
If idle channel reservation number is greater than the channel number of ongoing communication in a wave beam in current wave beam, newly calls out low orbit satellite and seize channel reservation success;
If idle channel reservation number is less than the channel number of ongoing communication in a wave beam region in current wave beam, according to the new low orbit satellite position judgment of calling out, whether seize channel reservation; Determination methods is as follows:
If newly call out distance between low orbit satellite and current wave beam, be less than and in a wave beam, will carry out the low orbit satellite of wave beam switching and the distance between current beam boundary, newly call out low orbit satellite and seize channel reservation success;
If newly call out distance between low orbit satellite and current wave beam, be greater than and in a wave beam, will carry out the low orbit satellite of wave beam switching and the distance between current beam boundary, newly call out low orbit satellite and seize channel reservation failure.
In step 1: when the priority of low orbit satellite is more than or equal to threshold value, this low orbit satellite sends the calling of request allocated channel to high rail satellite; When the priority of low orbit satellite is less than threshold value, this low orbit satellite image data is waited for.
Described priority is the ratio that the data volume of having stored in low orbit satellite buffer memory accounts for whole buffer memory capacity, and the priority of low orbit satellite of wherein sending urgent call is the highest.
While there is no idle channel on high rail satellite, if there is the low orbit satellite of urgent call, the channel of the low orbit satellite that high rail satellite cut-out priority is minimum is the low orbit satellite to urgent call by this channel allocation.
In step 2: newly call out low orbit satellite and ask the low orbit satellite that carries out wave beam switching to use common competitive channel according to first-in first-out FIFO principle.
In step 2, if the channel in the wave beam region of high rail satellite is all occupied, newly call out low orbit satellite call request failure, the low orbit satellite that request wave beam switches enters the state of waiting in line, when queuing number surpasses total channel numerical value, the low orbit satellite of request wave beam switching is forced to abandon.
Owing to having adopted technique scheme, method for channel allocation in satellite network provided by the invention, when satellite data communication, realized high rail satellite reasonably for low orbit satellite arranges channel, channel in high rail satellite coverage area is utilized fully, make low orbit satellite orderly receive the normal operation that channel has guaranteed communications.Method for channel allocation in satellite network disclosed by the invention has the following advantages:
1. the channel in high rail satellite coverage area is rationally used fully.
2. when data communication, owing to seizing the mode of channel reservation, make the orderly acquisition channel of a plurality of low orbit satellites, do not occur that between low orbit satellite, seizing channel clashes the phenomenon that causes transfer of data to be interrupted.
3. guaranteed the effective transmission of satellite communication system information.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, the accompanying drawing the following describes is only some embodiment that record in the application, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the illustraton of model of the low rail of high rail satellite and the transmission of low orbit satellite signal.
Fig. 2 is the flow chart that high rail satellite is low orbit satellite allocated channel.
Fig. 3 is the new schematic diagram that low orbit satellite is seized channel reservation of calling out.
Fig. 4 is the new flow chart that low orbit satellite is seized channel reservation of calling out.
Embodiment
For making technical scheme of the present invention and advantage clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is known to complete description:
Satellite network method for channel allocation disclosed by the invention, as shown in Figure 1: in satellite network, fast moving due to low orbit satellite, the visual time of its period of motion and ground station is all extremely limited, in order to guarantee the real-time transmitting of data, when low orbit satellite and ground station are when not visible, to carry out data retransmission by high rail satellite, in data forwarding process, when low orbit satellite moves to another high rail satellite coverage area by a high rail satellite coverage area, low orbit satellite need to carry out channel switch between two high rail satellites, and the channel quantity of high rail satellite is limited, therefore need to make rational method for channel allocation.
If Fig. 2 is the flow chart that high rail satellite is the method for low orbit satellite allocated channel: when the overlay area of a high rail satellite will enter the overlay area of next high rail satellite on low orbit satellite is leaving, need to carry out the conversion of interchannel.When if the buffer memory occupancy of low orbit satellite is more than or equal to threshold value, this low orbit satellite sends the calling of request allocated channel; And be defined as new calling low orbit satellite.When if the buffer memory occupancy of low orbit satellite is less than threshold value, this low orbit satellite image data is waited for.The buffer memory occupancy of low orbit satellite is defined as: the data volume of having stored in buffer memory accounts for the ratio of whole buffer memory capacity.The priority of low orbit satellite is directly proportional to buffer memory occupancy, and buffer memory occupancy is higher, and priority is higher.After the call request that high rail satellite reception sends to low orbit satellite, first judge whether this calling is the low orbit satellite that sends urgent call, or while there is the condition of a disaster, the low orbit satellite of transmission the condition of a disaster information, the priority of the low orbit satellite being in an emergency is made as the highest, can be called VIP satellite, so high rail satellite need to be first for VIP satellite arranges channel, while there is no idle channel on this high rail satellite, to cut off the channel of the low orbit satellite that priority is minimum, by this channel allocation to VIP satellite.When if this low orbit satellite is not VIP satellite, this low orbit satellite continues periodic duty, waits for that high rail satellite is its allocated channel.For those non-VIP satellites, do not consider channel reservation problem, high rail satellite is that low orbit satellite reasonably arranges channel, when arranging channel according to FIFO principle, be introduced into the principle that first obtains channel, for the low orbit satellite that sends request call simultaneously, high rail satellite is according to their priority height, from high to low be low orbit satellite allocated channel.While there is no available channel in high rail satellite, low orbit satellite is waited in line.
High rail satellite adopts multi-beam antenna conventionally, the coverage condition of each wave beam and terrestrial cellular Wang Yige base station cover similar, the high-speed motion of low orbit satellite, a wave beam that makes it from high rail satellite is switched to another wave beam, in order to guarantee the continuity of communication, especially the real-time Transmission of significant data, also needs to carry out the switching between high rail satellite beams.When switching between the wave beam of low orbit satellite in the overlay area of high rail satellite, discharge the channel using in a upper wave beam, and need to high rail satellite be that it is at next wave beam allocating channels therein.Now also have the new low orbit satellite of calling out will enter in the current wave beam region in this high rail satellite coverage area, high rail satellite need to be this new calling low orbit satellite allocated channel.
Embodiment:
If there is C bar channel in some wave beams of high rail satellite, claim that this wave beam is current wave beam, low orbit satellite is when waiting in line so, and maximum queue length is also C, distributes C
rbar is channel reservation, offers the low orbit satellite that carries out wave beam switching; Remaining C-C
rbar is common competitive channel, and the low orbit satellite and the new low orbit satellite of calling out that offer wave beam switching are used jointly.The new low orbit satellite of calling out low orbit satellite and need to carrying out wave beam switching is according to FIFO principle, is introduced into the principle that first obtains channel and jointly uses C-C
rbar channel.
When having a low orbit satellite need to carry out wave beam switching, first use common competitive channel, after common competitive channel is all occupied, re-use channel reservation.If C bar channel is all occupied, the low orbit satellite that needs to carry out wave beam switching sends calls out and enters the state of waiting in line, the overlapping region of queuing place between adjacent beams.When low orbit satellite does not have available channel when overlapping region, continue to wait in line, when having a channel to be released, the to be switched low orbit satellite in queue first place will obtain channel automatically, and queue refreshes successively.If motion surpasses overlapping region, also there is no available channel, low orbit satellite handover call request is forced to abandon,
When having a new calling low orbit satellite to send the channel using in current wave beam region to system, if C bar channel is all occupied, new call request failure, if common competitive channel is all not occupied, distributes idle channel to this new calling low orbit satellite.If the common competitive channel in current wave beam region is all occupied, and channel reservation is when also available free, newly calls out low orbit satellite and judges whether to seize channel reservation according to seizing algorithm, and method is as follows: as shown in Figure 3 and Figure 4:
If just having j user's ongoing communication in a upper wave beam of current wave beam, the channel of going up a wave beam is used state in j state, establishes channel in current wave beam and uses state in i state, and in current wave beam, idle channel reservation number is that (C-i) is individual,
When (C-i) is greater than j, it is the channel number that channel reservation number idle in current wave beam is greater than ongoing communication in a wave beam region, namely illustrate that the user who has sufficient channel reservation to keep supplying in a wave beam in current wave beam carries out wave beam switching, newly call out low orbit satellite and seize channel reservation success.
When (C-i) is less than j, it is the channel number that channel reservation number idle in current wave beam is less than ongoing communication in a wave beam region, namely illustrate whether the low orbit satellite that does not have enough channel reservations to keep supplying in a wave beam in current wave beam carries out wave beam switching use, seize channel reservation according to the new low orbit satellite position judgment of calling out; Determination methods is as follows:
The speed of service of supposing to carry out the low orbit satellite of wave beam switching equals newly to call out the speed of service of low orbit satellite, if newly call out low orbit satellite, be B, the distance of the current wave beam of distance is S, if the low orbit satellite leaving at first in a upper wave beam region of current wave beam is A, satellite A will carry out wave beam switching, low orbit satellite A is L apart from the distance of next wave beam
When S is more than or equal to L, go up the low orbit satellite leaving at first in a wave beam region and first arrive current wave beam region, newly call out low orbit satellite and seize channel reservation failure;
When S is less than L, newly call out low orbit satellite and first arrive in current wave beam region, newly call out low orbit satellite and seize channel reservation success.
Further, when the priority of low orbit satellite is more than or equal to threshold value, this low orbit satellite sends the calling of request allocated channel to high rail satellite; When the priority of low orbit satellite is less than threshold value, this low orbit satellite image data is waited for.When new calling low orbit satellite is more than or equal to threshold value with the priority that need to carry out the low orbit satellite of wave beam switching, just can send the calling that the high rail satellite of request is its allocated channel.
Further, priority definition is the ratio that the data volume of having stored in low orbit satellite buffer memory accounts for whole buffer memory capacity, and the priority of low orbit satellite of wherein sending urgent call is the highest.When there are the condition of a disaster or special circumstances, the priority of the low orbit satellite of urgent call is made as to the highest VIP of being defined as satellite.During if there is VIP low orbit satellite, even there is no idle channel on high rail satellite, high rail satellite will cut off the channel of the low orbit satellite that priority is minimum, by this channel allocation to VIP satellite.
Further, newly call out low orbit satellite and ask the low orbit satellite that carries out wave beam switching to use common competitive channel according to first-in first-out FIFO principle.
Further, if the C bar channel in the wave beam region of high rail satellite is all occupied, newly call out low orbit satellite call request failure, the low orbit satellite that request wave beam switches enters the state of waiting in line, when queuing number surpasses total channel numerical value, the low orbit satellite of request wave beam switching is forced to abandon.
The invention has the beneficial effects as follows: when low orbit satellite switches in the overlay area of many high rail satellites, first, guarantee the channel allocation of VIP satellite; Secondly, for avoiding satellite to abandon data because buffer memory is not enough, the buffer memory occupancy of low orbit satellite of take is setting parameter satellite priority, and high rail satellite is reasonably its allocated channel according to the height of low orbit satellite priority.When low orbit satellite switches between wave beam, when common competitive channel is all used and channel reservation when available free, newly call out low orbit satellite by according to the method for conversion channel reservation disclosed by the invention, judge whether to seize channel reservation.In the present invention, seize disclosing of channel method, effectively reduced the blocking rate of new calling low orbit satellite, thereby increased the channel utilization of high rail satellite in satellite system.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; according to technical scheme of the present invention and inventive concept thereof, be equal to replacement or changed, within all should being encompassed in protection scope of the present invention.
Claims (6)
1. a satellite network method for channel allocation, it is characterized in that: there are following steps: step 1: high rail satellite is a plurality of low orbit satellite allocated channels of waiting in line according to first-in first-out FIFO principle, to send the low orbit satellite of call request simultaneously, high rail satellite is just followed successively by its allocated channel according to the priority of low orbit satellite; Step 2: be channel reservation and common competitive channel by the channel distribution in the wave beam of high rail satellite; The low orbit satellite that carries out wave beam switching is used channel successively according to the order of first common competitive channel, rear channel reservation, after common competitive channel is finished using, newly calls out low orbit satellite and uses channel reservation according to conversion method; Described conversion method is as follows: if the interior idle channel reservation number of current wave beam is greater than the channel number of ongoing communication in a wave beam, newly calls out low orbit satellite and seize channel reservation success; If idle channel reservation number is less than the channel number of ongoing communication in a wave beam region in current wave beam, according to the new low orbit satellite position judgment of calling out, whether seize channel reservation; Determination methods is as follows: if newly call out distance between low orbit satellite and current wave beam, be less than and in a wave beam, will carry out the low orbit satellite of wave beam switching and the distance between current beam boundary, newly call out low orbit satellite and seize channel reservation success; If newly call out distance between low orbit satellite and current wave beam, be greater than and in a wave beam, will carry out the low orbit satellite of wave beam switching and the distance between current beam boundary, newly call out low orbit satellite and seize channel reservation failure; Described new calling low orbit satellite is: if when the buffer memory occupancy of low orbit satellite is more than or equal to threshold value, this low orbit satellite sends the calling of request allocated channel, and is defined as new calling low orbit satellite; The buffer memory occupancy of low orbit satellite is defined as: the data volume of having stored in buffer memory accounts for the ratio of whole buffer memory capacity.
2. a kind of satellite network method for channel allocation according to claim 1, is further characterized in that: in step 1: when the priority of low orbit satellite is more than or equal to threshold value, this low orbit satellite sends the calling of request allocated channel to high rail satellite; When the priority of low orbit satellite is less than threshold value, this low orbit satellite image data is waited for.
3. a kind of satellite network method for channel allocation according to claim 1, be further characterized in that: described priority is the ratio that the data volume of having stored in low orbit satellite buffer memory accounts for whole buffer memory capacity, the priority of low orbit satellite of wherein sending urgent call is the highest.
4. according to a kind of satellite network method for channel allocation described in claim 1 or 3, be further characterized in that: while there is no idle channel on high rail satellite, if there is the low orbit satellite of urgent call, the channel of the low orbit satellite that high rail satellite cut-out priority is minimum is the low orbit satellite to urgent call by this channel allocation.
5. a kind of satellite network method for channel allocation according to claim 1, is further characterized in that: in step 2: newly call out low orbit satellite and ask the low orbit satellite that carries out wave beam switching to use common competitive channel according to first-in first-out FIFO principle.
6. a kind of satellite network method for channel allocation according to claim 1, be further characterized in that: in step 2, if the channel in the wave beam region of high rail satellite is all occupied, newly call out low orbit satellite call request failure, the low orbit satellite that request wave beam switches enters the state of waiting in line, when queuing number surpasses total channel numerical value, the low orbit satellite of request wave beam switching is forced to abandon.
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| CN104363042B (en) * | 2014-12-04 | 2017-11-28 | 大连大学 | GEO LEO satellite network method for channel allocation |
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| CN110572203B (en) * | 2019-10-14 | 2020-12-29 | 中国科学院计算技术研究所 | User switching method in satellite communication |
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| CN111464227A (en) * | 2020-03-17 | 2020-07-28 | 深圳市航天华拓科技有限公司 | Low-earth-orbit satellite network switching method, device and system |
| CN111405540A (en) * | 2020-04-08 | 2020-07-10 | 成都爱科特科技发展有限公司 | Channel allocation method for emergency service |
| CN112383343B (en) * | 2020-11-10 | 2022-07-26 | 东方红卫星移动通信有限公司 | Channel dynamic reservation method and system based on geographical position of cluster user |
| CN113853024B (en) * | 2021-11-29 | 2022-03-04 | 中国星网网络系统研究院有限公司 | Data transmission method, system, device and storage medium |
| CN114449604B (en) * | 2022-02-14 | 2023-09-12 | 哈尔滨工业大学（深圳） | Low-orbit satellite switching method and device based on graph theory and multi-attribute decision combination |
| CN115276774B (en) * | 2022-08-04 | 2023-09-15 | 西华大学 | Multi-channel voice communication method |
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