CN101001101B - Satellite ground link switch-over method of mobile satellite network - Google Patents
Satellite ground link switch-over method of mobile satellite network Download PDFInfo
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- CN101001101B CN101001101B CN200710063382A CN200710063382A CN101001101B CN 101001101 B CN101001101 B CN 101001101B CN 200710063382 A CN200710063382 A CN 200710063382A CN 200710063382 A CN200710063382 A CN 200710063382A CN 101001101 B CN101001101 B CN 101001101B
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Abstract
This invention discloses a satellite link switch method in a mobile satellite network including: initializing switch, a switch satellite carries out route expanding operation to set up route with an objective satellite then sends information allowing access to said communication terminal, which receives the information and sets up communication connection between the objective satellite and the terminal, after setting up the connection, it can judge if re-route is needed, if so, the re-route operation is done. In this invention, after a switch happens, path can be re-set up quickly to secure durative of communication service after the switch and guarantee the optimum usage of network resources by suitably triggering re-route to reduce switch cost.
Description
Technical field
The present invention relates to the communication link changing method in a kind of communications field, the satellite-ground link changing method in especially a kind of mobile-satellite net.
Background technology
Low orbit mobile-satellite netting gear has that transmission delay is low, user terminal is realized simple and can realize advantage such as global communication by the inter-satellite link networking, become the important component part of next generation mobile communication system.But system also exists single problem such as limited, the sustainable call duration time weak point of satellite area coverage (as Iridium simultaneously, single satellite was to certain user's of ground maximum sustainable call duration time only 10 minutes), make the very big dynamic of existence between satellite and terrestrial user, need to solve the satellite-ground link switching problem, to guarantee user's communication continuity under this dynamic condition.
Satellite-ground link switching problem in the low orbit mobile satellite network can be expressed as ground based terminal when the satellite A area of coverage changes to the satellite B area of coverage, and terminal and this two satellite annexations change and the telex network disruption brought.As shown in Figure 1, wherein the direction represented of solid arrow is the direction of satellite motion, the direction that dotted arrow is represented is the direction that terminal moves, when position 1, communication terminal A S1 via satellite inserts satellite network, motion along with satellite, current terminal A changes to position 2 by position 1, at this moment the communication performance between communication terminal A and satellite S1 descends gradually, and the signal reception of satellite S2 is become better and better, after communication terminal A passes ab, communication terminal A begins handoff procedure, the satellite S1 of disconnected swap signal weak effect, and communicate by letter with the good satellite S2 of signal effect, this process promptly is that satellite-ground link switches.
This situation is similar to the transregional switching in the land mobile communication, but owing to switch and to relate to two different satellite nodes, will inevitably cause original route to lose efficacy, and need utilize method such as heavy-route to set up new route, to guarantee communication continuity.As Fig. 2, shown in Figure 3, establish communication terminal A via satellite S1, satellite S2 and communication terminal B communicate, at this moment the routed path of message transmission is A-S1-S2-B.Motion along with satellite, when communication terminal B enters in the area of coverage of satellite S3, in order to keep the continuity of calling, new communication path should comprise satellite S3, this moment, the path of message transmission was A-S1-S2-S3-B, i.e. switching causes original route to lose efficacy, and needs the continuation of change route with maintain communications.
Research about satellite-ground link switching aspect is the emphasis and the main contents of satellite Study on Handover Technology always, relevant achievement in research is a lot, early stage research mainly concentrates on when mobile communication terminal and changes to another area of coverage from an area of coverage (may be that satellite also may be the wave beam sub-district), how to guarantee successful call handoff, it focuses on: utilize mobile cellular communication sub-district, existing ground handoff technique, realize the handover of satellite mobile communication terminal, comprise switch step and strategy, channel allocation strategy etc.These methods generally only are applicable to single gso satellite communication system or do not have the mobile constellation of inter-satellite link, and, then often can't effectively be suitable for or can not get effect preferably for mobile constellation that has inter-satellite link and the mobile-satellite integrated system of new generation that developing.
For the mobile satellite network that inter-satellite link is arranged, the star ground of mobile communication terminal switches need be when solving the communication terminal transfer, the transmitting continuous property problem that consideration brings owing to routing change, this problem has obtained attention in the research of satellite switching recently, become the focus that present satellite switches research. existing studies show that, for satellite network with inter-satellite link, because at this moment every satellite can be regarded a router with standalone feature as, thereby communication terminal will inevitably cause original route to lose efficacy in the intersatellite switching of difference, need utilize methods such as heavy-route to set up new route, to guarantee communication continuity. at the problems referred to above, existing solution mainly contains following two classes: whole heavy-routes and part heavy-route. and wherein all heavy-routes are needing rebulid a new information transmission path between two portable terminals after the switching, though this method can guarantee to switch the optimization of back information transmission path, but owing to need carry out new route, processing delay is often very big, can bring bigger handover blocking, and need consume a large amount of signal resources. for the part heavy-route, when switching generation, original route is partly preserved, have only changing unit to be updated, this method processing delay is smaller, and needed extra signal resource is also less, but newly-generated path may not be an optimization path, this can cause the unreasonable use to Internet resources, and the QoS index of original calling (as time delay etc.) may be destroyed in new route.
For the low orbit mobile satellite network, above-mentioned two kinds of methods all have weak point, when using the little local route of processing delay, can obtain handover blocking preferably, but can not guarantee to switch the optimum (can't guarantee that promptly the optimum that switches the back Internet resources uses) of rear path; If carry out route selection again after switching, can obtain new optimal path on the contrary, but the processing delay that needs is longer, will cause big handover blocking, considers the factor of this two aspect so need trade off.
Summary of the invention
The objective of the invention is at above-mentioned the deficiencies in the prior art, satellite-ground link changing method in a kind of mobile-satellite net is provided, this method is a kind of new solution that puts forward on the basis of the pluses and minuses of taking all factors into consideration two kinds of methods, on the basis that indexs such as guaranteeing service switchover communication continuity and time delay is not destroyed, reduce the switching expense as much as possible, thereby improve the effective rate of utilization of switching the back Internet resources.Method by the route expansion guarantees the service switchover communication continuity, and utilizes the method for carrying out heavy-route in due course to reduce the influence of switching to network performance effectively.
For achieving the above object, the invention provides the satellite-ground link changing method in a kind of mobile-satellite net, comprising:
Step 4, judge whether and need re-route, if, then carry out the operation that re-routes otherwise, finish;
Described step 2 is specially:
Step 21, judge whether described switch satellite is on the routed path of current described communication terminal and described purpose satellite, if then execution in step 22, otherwise, execution in step 23;
As current routed path, execution in step 25 then to the routed path of purpose satellite for step 22, the described switch satellite of intercepting;
Step 23, from described purpose satellite, check the neighbor node that whether has described switch satellite in each node successively, if exist, then execution in step 24, otherwise, execution in step 26;
Step 24, set up the route of described switch satellite and described neighbor node;
Step 25, revise and to transmit, the routed path after the record expansion, and the routed path information after will expanding sends to each gateway in the communication link, execution in step 3 then;
Step 26, set up switch satellite and the intersatellite new routed path of purpose, execution in step 3 then;
Described step 4 is specially:
Step 41, judge whether the routed path after the described expansion satisfies the required QOS of current business,, then carry out the operation that re-routes if do not satisfy;
If step 42 satisfies the required QOS of described current business, then calculate the expense of the routed path after the described expansion, and judge this expense whether greater than adopting possible cost value after the heavy-route, if greater than, then carry out the operation that re-routes.
As shown from the above technical solution, the present invention has following beneficial effect:
1) after switching takes place, but the quick reconfiguration path guarantees the continuation that service after switching is communicated by letter;
2) after the fast path reconstruct, reduce the switching expense, guarantee that the optimum that switches the back Internet resources uses by suitable triggering heavy-route.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the satellite-ground link switching principle schematic diagram of prior art;
Fig. 2 is the satellite-ground link switching state schematic diagram one of prior art;
Fig. 3 is the satellite-ground link switching state schematic diagram two of prior art;
Fig. 4 is that satellite-ground link of the present invention switches example schematic;
Fig. 5 is the flow chart of the specific embodiment 1 of satellite-ground link changing method of the present invention;
Fig. 6 is a route expansion flow chart in the satellite-ground link changing method of the present invention.
Embodiment
As shown in Figure 4, wherein the direction represented of solid arrow is the direction of satellite motion, the direction that dotted arrow is represented is the direction that terminal moves, communication terminal B under communication terminal A under the current satellite s and the purpose satellite t establishes a communications link, in communication process, communication terminal A enters switching state, to progress into the coverage of switch satellite s ' from the coverage of current satellite s, promptly switch to node s ' (each satellite also is a node the communication link) from node s, then this switching flow comprises the steps: as shown in Figure 5
As shown in Figure 6, the concrete operations of route expansion can for:
Step 21, judge whether described switch satellite s ' is on the routed path of current described communication terminal and described purpose satellite t, if then execution in step 22, otherwise, execution in step 23;
The routed path that step 22, the described switch satellite s ' of intercepting arrive purpose satellite t is as current routed path, and execution in step 25 then;
Step 23, from described purpose satellite t, check the neighbor node that whether has described switch satellite s ' in each node successively, if exist, then execution in step 24, otherwise, execution in step 26;
Step 24, set up the route of described switch satellite s ' and described neighbor node;
Step 25, revise and to transmit, the routed path after the record expansion, and the routed path information after will expanding sends to each gateway in the communication link, execution in step 3 then;
Step 26, set up the new routed path between switch satellite s ' and purpose satellite t.Newly-built path can be that execution in step 3 then through the optimal path after calculating.
Connect to set up finish after, can comprise following operation: communication terminal A sends handover success message to described switch satellite s ', and being connected of interruption and current satellite s, and discharge channel resource and label, and modification is transmitted.
The remaining path of back original route is switched in route extended operation utilization in this patent, adopts the method for expanding fast to repair the route of interruption rapidly, sets up new routing channel rapidly for switching channels, and the continuity of service communication is guaranteed.After the route expansion, switch satellite s ' will generate the new route at current business, and revise and transmit accordingly, and newly-generated path will utilize original path to greatest extent, comprise resource, label and transmit etc., meanwhile, corresponding resource, label etc. disappear with split in the node that does not re-use in satellite node s and the original route, and in transmitting accordingly clauses and subclauses also with deleted.
Though the route expansion fast effectively, but the path of setting up often exists the wasting of resources to satisfy QoS etc. greatly and not, therefore, also need to optimize route after the switching by heavy-route, the this respect algorithm need at first to judge whether heavy-route, for satisfying QoS after switching and switching the big situation of the back wasting of resources, need carry out end-to-end routing optimality again.Because of, after above-mentioned steps 3, can also comprise the step of heavy-route: step 4, judge whether and need re-route, if, then carry out the operation that re-routes, otherwise, finish;
For whether re-routing, mainly be to judge according to the required QOS of current business (service quality), if the routed path after the described expansion does not satisfy the required QOS of current business, then need to carry out the operation of rerouting, select optimum routed path.
For the use Internet resources that can more optimize, under the prerequisite that satisfies the required QOS of current business, further calculate the expense of the routed path after the described expansion, and judge that whether this expense is greater than possible cost value after the employing heavy-route, if greater than, then carry out the operation that re-routes, finish.
Above-mentioned deterministic process can adopt following algorithm, if use C
AugmentThe expense of the new routed path in expression route expansion back, after heavy-route, its switching expense (is designated as C
Reroute) (be designated as C with new optimal path expense
New) and the signaling expense (C during heavy-route
Signal) relevant, C
Reroute=(1+ δ) C (wherein C in network, transmit expense), wherein δ=C for the business of this terminal
Signal/ C
NewIf C
AugmentDuring/C＞1+ δ, carry out the operation that re-routes.
After new routed path is set up, also further can comprise operations such as discharging original routed path resource and label.
It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not limit it, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.
Claims (3)
1. the satellite-ground link changing method in the mobile-satellite net is characterized in that, comprises the steps:
Step 1, current satellite receive that communication terminal sends switch to the handoff request of this switch satellite from current satellite after, described current satellite will switch required necessary information and send to described switch satellite, described switch satellite is that described communication terminal distributes corresponding channel, and channel parameter is sent to described communication terminal;
Step 2, described switch satellite carries out route expanding operation, the route of foundation and purpose satellite sends the message that allows access to described communication terminal then;
Step 3, described communication terminal are set up communicating to connect between described purpose satellite and described communication terminal after receiving the message of described permission access;
Step 4, judge whether and need re-route, if, then carry out the operation that re-routes otherwise, finish;
Described step 2 is specially:
Step 21, judge whether described switch satellite is on the routed path of current described communication terminal and described purpose satellite, if then execution in step 22, otherwise, execution in step 23;
As current routed path, execution in step 25 then to the routed path of purpose satellite for step 22, the described switch satellite of intercepting;
Step 23, from described purpose satellite, check the neighbor node that whether has described switch satellite in each node successively, if exist, then execution in step 24, otherwise, execution in step 26;
Step 24, set up the route of described switch satellite and described neighbor node;
Step 25, revise and to transmit, the routed path after the record expansion, and the routed path information after will expanding sends to each gateway in the communication link, execution in step 3 then;
Step 26, set up switch satellite and the intersatellite new routed path of purpose, execution in step 3 then;
Described step 4 is specially:
Step 41, judge whether the routed path after the described expansion satisfies the required QOS of current business,, then carry out the operation that re-routes if do not satisfy;
If step 42 satisfies the required QOS of described current business, then calculate the expense of the routed path after the described expansion, and judge this expense whether greater than adopting possible cost value after the heavy-route, if greater than, then carry out the operation that re-routes.
2. method according to claim 1 is characterized in that, also comprises in the described step 3:
Communication terminal will send handover success message to described switch satellite, and being connected of interruption and current satellite, and discharge channel resource and label, and modification be transmitted.
3. method according to claim 1 is characterized in that, also comprises: after setting up new routed path, discharge original routed path resource and label.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710063382A CN101001101B (en) | 2007-01-10 | 2007-01-10 | Satellite ground link switch-over method of mobile satellite network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710063382A CN101001101B (en) | 2007-01-10 | 2007-01-10 | Satellite ground link switch-over method of mobile satellite network |
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| CN101001101A CN101001101A (en) | 2007-07-18 |
| CN101001101B true CN101001101B (en) | 2010-05-12 |
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| CN200710063382A Expired - Fee Related CN101001101B (en) | 2007-01-10 | 2007-01-10 | Satellite ground link switch-over method of mobile satellite network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346964A (en) * | 2013-07-02 | 2013-10-09 | 北京京东尚科信息技术有限公司 | Space-ground link changeover method and system based on multilayer satellite network |
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| CN102098092B (en) * | 2011-01-25 | 2013-07-31 | 大连大学 | Method for quickly establishing satellite-to-ground link |
| CN102395134B (en) * | 2011-11-09 | 2014-09-17 | 北京航空航天大学 | Selection method for route planning of satellite-to-ground integration and selection apparatus thereof |
| CN105451413B (en) * | 2015-11-13 | 2018-06-19 | 小米科技有限责任公司 | Lamp light control method, apparatus and system |
| CN109075853B (en) * | 2016-04-28 | 2019-09-10 | 高通股份有限公司 | For the switching of satellite communication |
| CN110536364B (en) * | 2018-05-25 | 2023-02-28 | 中兴通讯股份有限公司 | Method and device for realizing communication link switching |
| CN109194383B (en) * | 2018-09-13 | 2022-03-15 | 上海垣信卫星科技有限公司 | Method for managing mobility in low-orbit satellite communication system |
| CN112789911B (en) * | 2018-09-27 | 2022-08-16 | 中兴通讯股份有限公司 | Method and system for mobility management in non-terrestrial networks |
| CN110972138B (en) | 2018-09-30 | 2021-06-15 | 华为技术有限公司 | Data processing method and data processing equipment thereof |
| CN109526061B (en) * | 2018-12-28 | 2023-04-07 | 四川安迪科技实业有限公司 | Channel bandwidth lossless switching method based on satellite communication |
| CN111836315A (en) * | 2019-04-22 | 2020-10-27 | 华为技术有限公司 | Joint switching method, device, equipment and storage medium |
| CN111147120B (en) * | 2019-12-03 | 2020-11-10 | 南京中科晶上通信技术有限公司 | Method, device, terminal and storage medium for determining switching path between satellites |
| CN111211829B (en) * | 2019-12-31 | 2021-11-02 | 东方红卫星移动通信有限公司 | Method for lossless switching of data between low-orbit satellites |
| CN111510971B (en) * | 2020-04-09 | 2022-09-09 | 中电科航空电子有限公司 | Method and system for switching auxiliary control link of airborne low-orbit satellite communication terminal |
| CN115314102B (en) * | 2022-09-29 | 2022-12-27 | 中国电子科技集团公司第五十四研究所 | Mobile switching management method suitable for multi-satellite networking |
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| CN1426640A (en) * | 2000-02-29 | 2003-06-25 | 世界空间公司 | Method and apparatus for mobile platform reception and synchronization in direct digital satellite broadcast system |
| CN1497871A (en) * | 2002-10-21 | 2004-05-19 | 株式会社日立制作所 | Signal receiving and service providing method, receiving terminal, satellite control method and device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1426640A (en) * | 2000-02-29 | 2003-06-25 | 世界空间公司 | Method and apparatus for mobile platform reception and synchronization in direct digital satellite broadcast system |
| CN1497871A (en) * | 2002-10-21 | 2004-05-19 | 株式会社日立制作所 | Signal receiving and service providing method, receiving terminal, satellite control method and device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103346964A (en) * | 2013-07-02 | 2013-10-09 | 北京京东尚科信息技术有限公司 | Space-ground link changeover method and system based on multilayer satellite network |
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