CN107800472B - A kind of method for handover control and system based on resource reservation in satellite network - Google Patents

A kind of method for handover control and system based on resource reservation in satellite network Download PDF

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CN107800472B
CN107800472B CN201711182703.0A CN201711182703A CN107800472B CN 107800472 B CN107800472 B CN 107800472B CN 201711182703 A CN201711182703 A CN 201711182703A CN 107800472 B CN107800472 B CN 107800472B
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cell
sub
wave beam
business
resource reservation
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CN107800472A (en
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陶滢
覃落雨
高梓贺
王厚天
李明
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China Academy of Space Technology CAST
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China Academy of Space Technology CAST
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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
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
    • 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
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
    • H04B7/18547—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/06—Airborne or Satellite Networks

Abstract

The method for handover control and system based on resource reservation in a kind of satellite network of the present invention, comprising: 1, according to the service request of terminal, determine the mild-natured equal communication time of business statistics, bandwidth demand and service switching interruption rate；2, according to the size relation of business statistics mild-natured equal communication time and satellite network wave beam cell channel duration, one wave beam cell is divided into multiple sub-cells by the mild-natured equal communication time of business statistics；3, the wave beam sub-cell for obtaining the accessed satellite of the service terminal is calculated；4, using the predictability of satellite network link switching and the location information of terminal, at the time of setting terminal initiates resource reservation request in each sub-cell；It 5, is the resource reservation for newly entering network service and to be switched business realizing distinct methods according to the real time resources state of next wave beam sub-cell.

Description

A kind of method for handover control and system based on resource reservation in satellite network
Technical field
The satellite network method for handover control and system, especially one kind that the present invention relates to a kind of based on resource reservation pass through Wave beam sub-cell mechanism is established to carry out rationally reserved method to the resource in satellite network handoff procedure.
Background technique
LEO satellite communication system has biography compared to satellite communication system due to the orbit altitude of constellation The advantages that defeated time delay is low, track resources are abundant and user terminal is low in energy consumption, however due to user terminal and LEO satellite star The relative motion of seat, and the area coverage of the simple beam cell of single star is limited, user terminal generally required in communication process into Row beam switchover even inter-satellite handover is to guarantee the uninterrupted communication of business.
Switch mainly rotating and the movement of ground based terminal around ground by satellite in usual LEO satellite communication process And cause.According to Kepler third law, the rotation speed of satellite is related with its orbit altitude.Orbit altitude be 5000~ The MEO satellite substar rate of 15000km is about 14000~19000km/h, much larger than the rate of any terrestrial user terminals The movement of (being usually no more than 1000km/h), therefore in general communication process (about a few minutes), user can be ignored not Meter only considers to switch as caused by satellite motion.As shown in Figure 1, the single beam coverage of every satellite is limited, With the movement of satellite, the boundary of user terminal relative motion to current beam, channel condition also runs down, therefore, just Channel switching must be carried out between even different satellites between different beams in the ground based terminal of communication, it is entire to guarantee The continuity of communication service, since tolerance of the user to communication disruption is extremely low, and beam switchover generation is more frequent, therefore wave Beam switching problem is one of the key technology that LEO satellite Communication System Design must solve in the process.
For the beam switchover problem that service terminal in LEO satellite communication system faces, current most effective solution Method is by the way of resource reservation, i.e., before the switching threshold point that be switched business reaches current beam cell, to next Wave beam cell sends resource reservation request, to be business bandwidth resource, to guarantee the continuity of service communication.Switch threshold Value point is existing one of the key concept of method for handover control based on resource reservation, as shown in Fig. 2, a wave beam cell is cut Change threshold value tTHIt is divided into region A and region B, when business is from region A relative motion to region B, if reaching the switching threshold point tTH, then resource reservation request is initiated to next wave beam cell, this method can preferably guarantee that service switching is successfully basic On, lifting system resource utilization.In the existing method for obligating resource based on wave beam cell, as shown in figure 3, its switching flow Can be divided into the following three steps:
Step 1, business are communicated in current beam cell, and according to positioning device, it is small to judge whether business reaches wave beam The threshold boundaries t in areaTH；
Step 2, when business reach wave beam cell threshold boundaries when, the bandwidth demand according to needed for business, to next wave beam Cell initiates resource reservation request；
Step 3 judges whether next wave beam cell has enough resources, if there is being then that the business is pre- in next wave beam cell Resource is stayed, channel reservation request is entered if not and is lined up, it, can be with if next cell has resource that can reserve before being lined up time-out Resource is reserved for the business, is switched successfully；Otherwise time-out, handover failure and business is forced to interrupt are lined up.
The critical issue of method for handover control are as follows: under the premise of guaranteeing the QoS demand of service switchover, reduce money as far as possible The wasting of resources brought by the reservation procedure of source, lifting system resource utilization.The existing this kind of resource based on wave beam cell is pre- Staying strategy is whole channel durations that the reserved resource of business is next wave beam cell.Consider one is by orbit altitude 8000km, the satellite constellation that six MEO satellites that orbit inclination angle is 0 ° form, the satellite cover time is about 1.3h, and wave beam covers Covering the time is about 25min, existing this kind of by taking the duration obeys voice service of the mean value for the Poisson distribution of 10min as an example Resource reservation policy will reserve the bandwidth resources of 25min duration for the business in next cell, due to business average duration For 10min, it is clear that this kind of resource reservation mechanism will lead to the great wasting of resources, and extremely limited for bandwidth resources and very For valuable satellite communication system, wasting of resources bring cost is very huge.
Summary of the invention
The technical solution that the present invention solves is: overcoming the deficiencies of the prior art and provide a kind of satellite based on resource reservation Network switching control method, using the statistical characteristic of business duration, by establishing wave beam sub-cell model, it is ensured that system The resource reserved and business actual demand keep statistical consistent, on the basis of guaranteeing QoS of survice demand, greatly reduce pre- Stay the process bring wasting of resources.It is different to the tolerance of resource reservation failure according further to network service and to be switched business is newly entered The feature of cause proposes a kind of method for obligating resource distinguished and newly enter network service and to be switched business, preferential to guarantee to lose switching Losing rate requires stringenter to be switched service resources to reserve successful probability.
The technical scheme is that a kind of satellite network method for handover control based on resource reservation, including walk as follows It is rapid:
Step 1, the service request according to terminal determine the mild-natured equal communication time of business statistics, bandwidth demand and business Handoff rate；
Step 2, according to the size of business statistics mild-natured equal communication time and satellite network wave beam cell channel duration One wave beam cell is divided into multiple sub-cells by the mild-natured equal communication time of business statistics by relationship；
Step 3 calculates the wave beam sub-cell for obtaining the accessed satellite of the service terminal；
Step 4, using the predictability of satellite network link switching and the location information of terminal, terminal is set each At the time of initiating resource reservation request in sub-cell；
Step 5, according to the real time resources state of next wave beam sub-cell, newly to enter network service and to be switched business realizing The resource reservation of distinct methods.
The step 2 method particularly includes: if the mild-natured equal communication time of business statistics is believed lower than satellite network wave beam cell One complete satellite beams cell is then divided into multiple sub-cells by the road duration, when each sub-cell a length of business system Count mild-natured equal communication time；If the mild-natured equal communication time of business statistics continues greater than or equal to satellite network wave beam cell channel Time, then using an entire satellite network wave beam cell as a sub-cell.
The step 3 calculates the wave beam sub-cell for obtaining the accessed satellite of the service terminal method particularly includes: according to GPS Etc. positioning devices, the particular geographic location and its access satellite when service terminal accesses network are determined, and according to wave beam in step 2 The division relationship of sub-cell and wave beam cell, correspondence wave beam cell and the corresponding son for calculating the accessed satellite of the service terminal are small Specific location in area.
The step 4 method particularly includes:
Firstly, derive initiate resource reservation request at the time of and business between the handoff rate in a sub-cell Functional relation further derives resource reservation request then according to the distributed relation in step 2 between wave beam cell and sub-cell At the time of and functional relation of the business between the handoff rate in an entire wave beam cell, finally according to the functional relation, It is solved by successive ignition, obtains the door for initiating the time threshold of resource reservation request when meeting service switching interruption rate accordingly Limit value.
The step 5 method particularly includes:
Step 51: judging business nature, if it is the business newly to network, then follow the steps 52, else if being to be switched Business, then follow the steps 53；
Step 52: according to the location information for newly entering network service, judging the user whether in the obtained time threshold of step 42 Whether access sub-cell further judges current sub-cell if the user accesses wave beam sub-cell before time threshold before value It is reserved for the user there are available resources, if so, 54 are thened follow the steps, it is no to then follow the steps 55；Else if the user when Between wave beam sub-cell is accessed after threshold value, further judge whether current sub-cell and next sub-cell have available resources for the use Family is reserved, if had, thens follow the steps 54, no to then follow the steps 55；
Step 53: for be switched business, according to business location information, when service terminal relative motion to step 42 institute At the time of the time threshold for the sub-cell acquired, resource reservation request is initiated, system judges current sub-cell and next sub-cell Whether there are available resources reserved for the user, if had, thens follow the steps 54, it is no to then follow the steps 55；
Step 54: system has that enough resources are reserved for business at this time, then system is successfully that the user reserves resource, and to Family returns to resource reservation success signaling；
Step 55: system does not have enough resources reserved for business at this time, then user arrives into state is waited in line in business Up within the time before the right margin of current sub-cell, if system can satisfy money of the user as described in step 52 or step 53 Source demand, then enter step 54；Otherwise business waits time-out, enters step 56；
Step 56: resource reservation fails at this time, and for newly entering network service, system returns to resource reservation to user and unsuccessfully believes It enables；For to be switched business, then the business is forced to interrupt.
When the mild-natured equal communication time of business statistics is lower than the satellite network wave beam cell channel duration, if satellite network A length of non-integer relationship when wave beam cell duration and sub-cell, then when a length of business statistics of the last one sub-cell is mild-natured logical Believe that duration removes the remainder of satellite network wave beam cell duration, if a length of integer closes when satellite network wave beam cell duration and sub-cell System, then each sub-cell duration is the mild-natured equal communication time of business statistics.
A kind of satellite network handover control system based on resource reservation, including data obtaining module, wave beam sub-cell are drawn Sub-module, wave beam sub-cell computing module, thresholding determining module and resource reservation module；
Data obtaining module according to the service request of terminal, obtain the mild-natured equal communication time of business statistics, bandwidth demand with And service switching interruption rate；
Wave beam sub-cell division module is held according to the mild-natured equal communication time of business statistics with satellite network wave beam cell channel The size relation of continuous time, is divided into multiple sub-cells for a wave beam cell by the mild-natured equal communication time of business statistics；
Wave beam sub-cell computing module calculates the wave beam sub-cell for obtaining the accessed satellite of the service terminal；
Terminal is arranged using the predictability of satellite network link switching and the location information of terminal in thresholding determining module At the time of initiating resource reservation request in each sub-cell；
Resource reservation module is newly to enter network service and to be switched industry according to the real time resources state of next wave beam sub-cell The resource reservation of pragmatic existing distinct methods.
The specific division methods of wave beam sub-cell division module are as follows: if the mild-natured equal communication time of business statistics is lower than One complete satellite beams cell is then divided into multiple sub-cells, each by the satellite network wave beam cell channel duration A length of business statistics mild-natured equal communication time when sub-cell；If the mild-natured equal communication time of business statistics is greater than or equal to satellite network The network wave beam cell channel duration, then using an entire satellite network wave beam cell as a sub-cell.
The specific work process of the thresholding determining module are as follows: firstly, derive initiate resource reservation request at the time of and industry Be engaged in functional relation between the handoff rate in a sub-cell, then according to wave beam cell in step 2 and sub-cell it Between distributed relation, at the time of further deriving resource reservation request and handoff rate of the business in an entire wave beam cell Between functional relation solved finally according to the functional relation by successive ignition, obtain and meet service switching interruption rate phase The threshold value of the time threshold for the initiation resource reservation request answered.
The specific works engineering of the resource reservation module are as follows:
Step 511: judging business nature, if it is the business newly to network, then follow the steps 521, else if being to be cut The business changed, thens follow the steps 531；
Step 521: according to the location information for newly entering network service, it is small to judge whether the user accesses son before time threshold Area further judges whether current sub-cell has the available resources to be if the user accesses wave beam sub-cell before time threshold The user is reserved, if so, 541 are thened follow the steps, it is no to then follow the steps 551；Else if the user is followed by time threshold Enter wave beam sub-cell, further judge whether current sub-cell and next sub-cell there are available resources to reserve for the user, such as Fruit has, and thens follow the steps 541, no to then follow the steps 551；
Step 531: for be switched business, according to business location information, when service terminal relative motion to step 42 At the time of the time threshold of obtained sub-cell, resource reservation request is initiated, system judges that current sub-cell and next son are small Whether area has available resources reserved for the user, if had, thens follow the steps 541, no to then follow the steps 551；
Step 541: system has enough resources to reserve for business at this time, then system is successfully the reserved resource of the user, and to User returns to resource reservation success signaling；
Step 551: system does not have enough resources reserved for business at this time, then user is into state is waited in line, in business In time before reaching the right margin of current sub-cell, if system can satisfy the user as described in step 521 or step 531 Resource requirement, then enter step 541；Otherwise business waits time-out, enters step 561；
Step 561: resource reservation fails at this time, and for newly entering network service, system returns to resource reservation to user and unsuccessfully believes It enables；For to be switched business, then the business is forced to interrupt.
The invention has the following advantages:
1) method for obligating resource based on wave beam sub-cell model is used, the statistics for taking full advantage of the service communication time is special Property and the satellite constellation characteristics of motion priori sex knowledge, every time for business reserve a wave beam sub-cell duration resource, the party Method can be on the basis of guaranteeing that service communication is successional, and reserved resource required for reducing, the method overcome tradition to be based on The problem of resource waste of the method for handover control of resource reservation；
2) by the way of distinguishing and newly entering network service and to be switched service priority, according to newly entering network service and to be switched industry It is engaged in inconsistent to the tolerance of resource reservation failure, devises different resource reservation processes, this method can guarantee newly to enter It is preferential to guarantee to require stringenter to be switched service resources pre- handover failure rate under the premise of network service handover failure rate requires Successful probability is stayed, tradition is overcome and does not distinguish the deficiency for newly entering network service and to be switched operational approach.
Detailed description of the invention
Fig. 1 is that satellite beams cover schematic diagram.
Fig. 2 is the switching threshold schematic diagram of existing resource reservation techniques.
Fig. 3 is the method for handover control based on resource reservation under the prior art.
Fig. 4 is the method for handover control of the invention based on resource reservation.
Fig. 5 is that schematic diagram is divided in wave beam sub-cell of the invention.
Fig. 6 is sub-cell switching threshold schematic diagram of the invention.
Fig. 7 is the ERW algorithm of the invention figure compared with the performance of tradition DDBHP algorithm.
Specific embodiment
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Referring to fig. 4, it is the satellite network method for handover control of the invention based on resource reservation, includes the following steps:
Step 1, the service request according to terminal determine the statistical average communication duration T of businessu, bandwidth demand is Bbps, service switching interruption rate Pf；
Step 2 divides sub-cell process.According to satellite network wave beam cell channel duration TcellWith business statistics Average communication duration TuBetween relationship, which can be divided into two kinds of situations: (1) Tcell< Tu, then mild-natured with business statistics Communication time TuOne complete satellite beams cell is divided into multiple sub-cells as the length of a sub-cell, such as Fig. 5, In view of TcellWith TuBetween possible non-integer relationship, when the length of the last one sub-cell is business statistics average communication Long TuExcept wave beam cell length TcellRemainder；(2)Tcell≥Tu, then using an entire satellite network wave beam cell as a son Cell.
Step 3, determined according to positioning device service terminal access network when specific location and access satellite, according to step The division relationship of wave beam sub-cell and wave beam cell in 2, calculates the wave beam sub-cell of the accessed satellite of the service terminal.
Step 4, using the predictability of satellite network link switching and the location information of terminal, guaranteeing user service On the basis of quality, reasonable terminal is set and initiates t at the time of resource reservation request in each sub-cellTH, maximize satellite The resource utilization of network, as shown in fig. 6, the step can specifically:
Firstly, deriving t at the time of initiating resource reservation requestTHWith business between the handoff rate in a sub-cell Functional relation further derive resource reservation then according to the distributed relation in step 2 between wave beam cell and sub-cell and ask T at the time of askingTHWith handoff rate P of the business in an entire wave beam cellfBetween functional relation, finally according to the function Relationship is solved by successive ignition, is obtained and is met service switching interruption rate PfWhen initiate time of resource reservation request accordingly The threshold value t of threshold valueTH, to guarantee that resource utilization ratio maximizes；
Step 5, according to the real time resources state of next wave beam sub-cell, be that new business and service switchover realize that resource is pre- It stays, which can specifically:
Step 51: judging business nature, if it is network service is newly entered, then follow the steps 52, else if being to be switched industry Business, thens follow the steps 53.
Step 52: according to business location information, judging that whether this newly enters network service in the obtained time threshold of step 42 tTHPreceding access wave beam sub-cell, i.e., if the user accesses sub-cell in region A, further judging whether current sub-cell has can It is reserved for the user with resource Bbps, if so, 54 are thened follow the steps, it is no to then follow the steps 55；Else if the new networking industry Business accesses sub-cell in region B, further judges whether current sub-cell and next sub-cell have available resources Bbps to be somebody's turn to do User is reserved, if had, thens follow the steps 54, no to then follow the steps 55；
Step 53: for be switched business, according to business location information, when service terminal relative motion to sub-cell Between threshold value tTHAt the time of, switching arranged resources request is initiated, system judges whether current sub-cell and next sub-cell have can It is reserved for the user with resource Bbps, if had, then follow the steps 54, it is no to then follow the steps 55；
Step 54: system has enough resources to reserve for business at this time, then system is successfully that the business reserves resource, and system can Bbps is subtracted with resource, and returns to resource reservation success signaling to user；
Step 55: system does not have enough resources reserved for business at this time, then business is arrived into state is waited in line in business Up within the time before the region B right margin of current sub-cell, if system can satisfy the user such as step 52 or step 53 institute The bandwidth demand Bbps stated, then enter step 54；Otherwise business waits time-out, enters step 56；
Step 56: resource reservation fails at this time, and for newly entering network service, system returns to resource reservation to user and unsuccessfully believes It enables；For to be switched business, then the business is forced to interrupt.
After the completion of above-mentioned handoff procedure, if the non-natural termination of business, iteration executes above-mentioned handoff procedure, until business Natural termination, entire communication process terminate.
The impact of performance obtained using method of the invention is as shown in Figure 7.Performance curve is ERW algorithm of the invention in scheming With the system congestion rate P of traditional DDBHP methodbWith handover failure rate PfWith switching threshold tTHThe performance curve of variation.Work as business Switching threshold tTHIt is of the invention when accounting for percentage from 10% to 90% variation of variation of sub-cell longest channel services time ERW algorithm is able to maintain lower system congestion rate P relative to DDBHP algorithmb, hence it is evident that the utilization of resources for improving system is forthright Can, overcome the resource reservation waste problem in conventional method.This is because ERW algorithm is the reserved slot length of business by leading to The average duration of letter, rather than the channel duration of an entire wave beam cell described in DDBHP determines, therefore ERW Algorithm can significantly be reduced to the reserved stock number of business at double, to guarantee have more resources that can be utilized by other business Rather than it is reserved.However, the resource reservation time ratio DDBHP method due to ERW algorithm is short, for communication duration For long service terminal, ERW algorithm will increase the number of resource reservation request, and the request failure of any first resource can all be led Call failure is caused, therefore this makes ERW algorithm face higher handover failure risk, therefore, as shown, ERW algorithm is being Unite handover failure rate PfOn performance ratio DDBHP scheme it is slightly poor.However, if the appropriate switching threshold t that we selectTH, can be with By system handover failure rate PfControl is in minimum value, to eliminate this influence.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited, Although the present invention is described in detail with reference to preferred embodiments, those skilled in the art should understand that: its according to So can be with modification or equivalent replacement of the technical solution of the present invention are made, and these modifications or equivalent replacement cannot also make Modified technical solution is detached from the spirit and scope of technical solution of the present invention.

Claims (6)

1. a kind of satellite network method for handover control based on resource reservation, it is characterised in that include the following steps:
Step 1, the service request according to terminal determine the mild-natured equal communication time of business statistics, bandwidth demand and service switching Interruption rate；
Step 2, according to the size relation of business statistics mild-natured equal communication time and satellite network wave beam cell channel duration, One wave beam cell is divided into multiple sub-cells by the mild-natured equal communication time of business statistics；
Step 3 calculates the wave beam sub-cell for obtaining the accessed satellite of the service terminal；Method particularly includes: it is filled according to GPS positioning Set, determine service terminal access network when particular geographic location and its access satellite, and according to wave beam sub-cell in step 2 with The division relationship of wave beam cell calculates the tool in the correspondence wave beam cell and corresponding sub-cell of the accessed satellite of the service terminal Body position；
Step 4, using the predictability of satellite network link switching and the location information of terminal, it is small in every height that terminal is set At the time of initiating resource reservation request in area；
Step 5, according to the real time resources state of next wave beam sub-cell, it is different newly to enter network service and to be switched business realizing The resource reservation of method.
2. a kind of satellite network method for handover control based on resource reservation according to claim 1, it is characterised in that: institute State step 2 method particularly includes: if the mild-natured equal communication time of business statistics is lower than the satellite network wave beam cell channel duration, A complete satellite beams cell is then divided into multiple sub-cells, when each sub-cell a length of business statistics average communication Duration；If the mild-natured equal communication time of business statistics is greater than or equal to the satellite network wave beam cell channel duration, by one Entire satellite network wave beam cell is as a sub-cell.
3. a kind of satellite network method for handover control based on resource reservation according to claim 1, it is characterised in that: institute State step 4 method particularly includes:
Firstly, deriving at the time of initiating resource reservation request and function of the business between the handoff rate in a sub-cell Relationship, then according to the distributed relation in step 2 between wave beam cell and sub-cell, further derive resource reservation request when It carves and functional relation of the business between the handoff rate in an entire wave beam cell passes through finally according to the functional relation Successive ignition solves, and obtains the time gate limit value for initiating resource reservation request when meeting service switching interruption rate accordingly.
4. a kind of satellite network method for handover control based on resource reservation according to claim 1 to 3, feature It is: when the mild-natured equal communication time of business statistics is lower than the satellite network wave beam cell channel duration, if satellite network wave Shu little Qu duration and when sub-cell a length of non-integer relationship, then the when a length of business statistics average communication of the last one sub-cell Duration removes the remainder of satellite network wave beam cell duration, if a length of integer closes when satellite network wave beam cell duration and sub-cell System, then each sub-cell duration is the mild-natured equal communication time of business statistics.
5. a kind of satellite network handover control system based on resource reservation, it is characterised in that: including data obtaining module, wave beam Sub-cell division module, wave beam sub-cell computing module, thresholding determining module and resource reservation module；
Data obtaining module obtains the mild-natured equal communication time of business statistics, bandwidth demand and industry according to the service request of terminal Business handoff rate；
When wave beam sub-cell division module continues according to the mild-natured equal communication time of business statistics and satellite network wave beam cell channel Between size relation, one wave beam cell is divided into multiple sub-cells by the mild-natured equal communication time of business statistics；
Wave beam sub-cell computing module calculates the wave beam sub-cell for obtaining the accessed satellite of the service terminal；
Terminal is arranged every using the predictability of satellite network link switching and the location information of terminal in thresholding determining module At the time of initiating resource reservation request in a sub-cell；
Resource reservation module is newly to enter network service and to be switched business reality according to the real time resources state of next wave beam sub-cell The resource reservation of existing distinct methods；
The specific work process of the thresholding determining module are as follows: exist at the time of initiating resource reservation request with business firstly, deriving The functional relation between handoff rate in one sub-cell, then according in step 2 between wave beam cell and sub-cell Distributed relation, further derive resource reservation request at the time of and business between the handoff rate in an entire wave beam cell Functional relation solved finally according to the functional relation by successive ignition, obtain corresponding when meeting service switching interruption rate Initiate the time gate limit value of resource reservation request.
6. a kind of satellite network handover control system based on resource reservation according to claim 5, it is characterised in that: institute State the specific division methods of wave beam sub-cell division module are as follows: if the mild-natured equal communication time of business statistics is lower than satellite network wave One complete satellite beams cell is then divided into multiple sub-cells, each sub-cell duration by the beam cell channel duration For the mild-natured equal communication time of business statistics；If the mild-natured equal communication time of business statistics is greater than or equal to satellite network wave beam cell Channel duration, then using an entire satellite network wave beam cell as a sub-cell.
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