CN106850045A - A kind of self adaptation overbooks LEO satellite system channel distribution method - Google Patents
A kind of self adaptation overbooks LEO satellite system channel distribution method Download PDFInfo
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- CN106850045A CN106850045A CN201710033738.1A CN201710033738A CN106850045A CN 106850045 A CN106850045 A CN 106850045A CN 201710033738 A CN201710033738 A CN 201710033738A CN 106850045 A CN106850045 A CN 106850045A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
LEO satellite system channel distribution method is overbooked the invention discloses a kind of self adaptation, belongs to moving communicating field；Specially：First, the mobility model of LEO satellite system is set up, and sets the condition of channel assignment strategy；For wave beam cell Ci, initial setting up pseudo channel occupancy sum S=0；Then, the call request for certain high-priority users accesses wave beam cell Ci, judge that the call request is new call request or handover call request, channel allocation process is overbooked for what different requests carried out self adaptation respectively, decide whether to access new call request or handover call request；Finally, wave beam cell CiCalling to terminating is processed, and the reservation request on any pseudo channel is transferred on the available channel shared by it；Advantage is：It is able to ensure that the switching cutting off rate of high-priority users, close in the case of zero, obtains less new call blocking rate, the overall service quality of lifting system.
Description
Technical field
The invention belongs to moving communicating field, the LEO satellite system channel of overbooking of specifically a kind of self adaptation is distributed
Method.
Background technology
Due to geographic factor and economic factor, cause land mobile communication system to realize that the whole world is reachable, compare, satellite
GSM is not influenceed by geographical position and distance, can at any time provide global seamless coverage communication；And LEO satellite system with
The advantages such as low transmission power, low transmission time delay and efficient bandwidth availability ratio, using the teaching of the invention it is possible to provide high-quality instant mobile communication clothes
Business.
IRIDIUM, with 6 orbit planes, respectively there is 11 as typical LEO satellite system on each orbit plane
Satellite, as shown in figure 1, any one satellite radiation scope at the earth's surface is a border circular areas, referred to as satellite footprint；For
Efficient frequency division multiplexing, a satellite footprint is divided into a large amount of smaller regions, referred to as wave beam cell.
However, LEO satellite runs at high speed with respect to earth surface, cause the user terminal may during a calling connection
Many satellites or wave beam cell are experienced, is frequently switched over.Wherein, the switching of wave beam cell is especially frequent.Because satellite system
Middle resource is very rare, if the purpose cell that user will be switched to does not have idle channel, the calling connection of user will be by
It is disconnected.For a user, this to be blocked more be difficult to and receives than new calling.Therefore, for switching calling is assigned in channel allocation
It is highly important to give priority higher.However, it is excessive if the channel resource of switching calling distribution, can cause newly to exhale again
The blocking rate for crying is excessive.
In addition, the user in LEO satellite system also has different brackets, is broadly divided into two classes：High-priority users
And domestic consumer.High-priority users such as commercial user, it is more sensitive and higher to quality of service requirement for postponing.Domestic consumer
Demand for time delay and service quality is more flexible.In channel allocation, should emphasis meet high-priority users
Demand.However, it is excessive if the channel of high-priority users distribution, the service quality degradation of domestic consumer is caused again.
In sum, for LEO satellite system, asked, it is necessary to consider two simultaneously when channel assignment strategy is designed
Topic：How to carry out rational channel distribution between switching calling and new calling, and how in high-priority users and general
The channel distribution of justice is carried out between general family.
Regarding to the issue above, the strategy for using in the prior art includes as follows：
1) switching (GH) strategy, is ensured；
When a calling (new calling or switching calling) reaches cell CiWhen, GH strategies attempt cell CiNext cell
Ci+1It is high-priority users channel reservation, if the idle channel in system is all locked out, then be issued by reservation request etc.
Treat idle channel.Because channel reservation occurred before the actual switching of high-priority users, the success for switching calling is actually obtained
Guarantee is arrived.
Ensure switching (GH) strategy based on the assumption that：
System has fixed number of channel C using fixed channel assignment scheme (FCA), i.e. each cell.In addition, queue up
Switching of the reservation request priority higher than new calling (being all so for high-priority users and domestic consumer) and domestic consumer
Calling.The calling of one arrival could only be accessed when the first two cell that it will experience is free idle channel, wherein
Any one cell does not have idle channel, and calling will be blocked in initial time.
The channel reservation method used in GH strategies is referred to as channel locks mechanism.This method for obligating is very guarded and oneself
Private, after a channel is locked, other users will be unable to use in addition to specific user, even if specific user does not have
The channel is taken, or also has a suitable segment distance from the cell.Therefore, although GH strategies ensure that high-priority users
Switching cutting off rate is zero, and its cost is but new call blocking rate higher, causes the overall service quality of low-down system.
2) a kind of, time-based channel reservation (TCRA) strategy：
Different from GH strategies, in TCRA strategies, channel is only locked within the use time that user expects.TCRA
Tactful it is critical only that the cell for determining that user will visit, while calculating the necessary channel locks time.The strategy is system
More accurate channel reservation is carried out to access more users, while strengthening the satisfaction for waiting accessing user.
Compared with GH strategies, TCRA strategies effectively reduce channel resource in cell and, by the time of unnecessary locking, are protecting
Card handover blocking rate is while be zero, obtains the overall service quality of the system of lower new call blocking rate and Geng Gao.
Although TCRA strategies are effectively reduced the situation of call congestion, the strategy is not examined calling termination
Consider, i.e., calling terminal occurred before channel reservation use, during using the channel reservation of TCRA strategies, reservation request exists
Call setup and each switching instant can be issued；In both circumstances, channel is by the quilt in specified time interval
Locking；However, calling may terminate at any time, will be cancelled in the channel reservation of next visit cell.Therefore, channel quilt
Insignificant locking, processing the problem will cause the more users of system access, while obtaining system entirety higher
Service quality.
3) a kind of, TCRA of oversubscription (TCRA-O) strategy
The exclusive of TCRA-O strategies is characterised by introducing the concept overbooked, in order to obtain the utilization of resources of maximum
Rate, system will receive the channel reservation request more than its ability, it is assumed which part will be cancelled, be connect in TCRA-O strategies
The wasting of resources of termination zone is called to make up by more reservation requests.
The main implementation process of TCRA-O strategies is as follows：
It is assumed that given cell CiThere is the available channel that quantity is C, the cell will be received positioned at either own cell CiNew exhale
It is request or upper cell Ci-1Handover request.For new calling, cell CiIt is seen as cell-of-origin；Called for switching, it is small
Area CiIt is seen as switching cell.TCRA-O is the expanding policy based on TCRA, its requirement to the channel reservation time and TCRA plans
Slightly consistent, i.e., each reservation request can be predicted accurately for the locking time of channel resource.TCRA-O strategies are considered each
In individual cell, in addition to real channel resource, also there are a number of virtual channel resources, quantity is S.Therefore, one
The access of individual reservation request or refusal will depend on the availability rather than C channel of C+S channel.Left and taken in advance with least S
It is expection to disappear, and cell will receive S the extra of channel and reserve.
Compared with GH strategies and TCRA strategies, the strategy effectively reduces the new call blocking rate of high-priority users, so
And it to sacrifice the switching call features of high-priority users is cost that this is；The cutting off rate of high-priority users is also no longer
Zero, influenceed by pseudo channel quantity S.
But, for TCRA-O strategies, if pseudo channel quantity S sets excessive, it will cause high-priority users
Handover failure rate rises, and is difficult to receive for user.If pseudo channel quantity S sets too small, Gao You cannot be effectively ensured
First level user obtains relatively low new call blocking rate.How optimal pseudo channel quantity S is obtained, to reach to channel resource
Optimum utilization, obtains the key that more preferable system service quality is TCRA-O strategies.
At present, the strategy is emulated by taking fixed pseudo channel number, and pseudo channel quantity S is set into cell
The 10% of middle real channel number C, although achieve certain effect, but pseudo channel quantity cannot be according to user's shape in system
Condition carries out the regulation of self adaptation to obtain optimal system service quality.
Optimal pseudo channel quantity S is obtained for self adaptation, 2 points of factors related to user terminal need below
Especially consider：
1. the position distribution of user terminal
The position distribution of user terminal determines its switching instant, for the user of cell handoff boundary, its switching
Will occur, be that its distribution pseudo channel is likely to result in handoff failure, influence service quality.For switching side away from cell
For the user on boundary, be its distribution pseudo channel switch over it is reserved be more of practical significance, while its new calling quilt can be avoided
Obstruction.Accordingly, it would be desirable to consider the setting of the different adjustment pseudo channel quantity for user terminal location.
2. the flow accounting of high-priority users
Pseudo channel in system only serves the channel reservation of high-priority users switching calling；If high in system
The flow accounting of priority users is relatively low, it is possible to consider that the appropriate setting for reducing pseudo channel quantity is general to reduce handoff failure
Rate；If the flow accounting of high-priority users is higher in system, it is possible to consider appropriate increase pseudo channel quantity to reduce
New call blocking rate.
It should be noted that being combined by by above two factor, more rational pseudo channel quantity can be carried out
Set, it is ensured that in switching cutting off rate close in the case of zero, obtain less new call blocking rate, obtain optimal system clothes
Business quality.
The content of the invention
The present invention in order to solve TCRA-O strategy in, pseudo channel quantity cannot carry out adaptive according to user's situation in system
The regulation answered, cause to obtain optimal this problem of system service quality, it is proposed that a kind of self adaptation overbooks LEO
Satellite system method for channel allocation.
Comprise the following steps that：
Step one, the mobility model of LEO satellite system is set up, and set the condition of channel assignment strategy；
Each wave beam cell is modeled as continuous rectangle cell, abbreviation one-dimensional movement model；Divide in each wave beam cell
It is the available channel of C equipped with number；
Based on mobility model, when carrying out channel assignment strategy research, using hypothesis below：
1) new calling is obeyed in the generation position of each wave beam cell and is uniformly distributed.
2) average call initiation rate is independently of number of calls in progress in each wave beam cell.
The arrival process of new calling and switching calling all obeys Poisson distribution, and the two is separate；Different characteristic is exhaled
Make arrival process also separate.
3) call duration obeys exponential distribution.
4) channel duration of each wave beam cell obeys exponential distribution.
Step 2, for wave beam cell Ci, initial time sets wave beam cell CiPseudo channel take sum S=0；
Step 3, the call request for certain high-priority users access wave beam cell Ci, judge that the call request is new
Call request or handover call request, if new call request, into step 4, otherwise, into step 5；
Step 4, wave beam cell CiSelf adaptation is carried out to the new call request of high-priority users overbooks channel point
With treatment, decide whether to access the new call request；
Comprise the following steps that：
Step 401, system the wave beam cell C after the new call request for receiving high-priority users is accessedi, first determine whether
Cell-of-origin CiIn whether there is idle channel, if it is, into step 402；Otherwise, the new call request is blocked；
Step 402, judge switching cell Ci+1In whether there is idle channel, if it is, for the new call request is being cut
Changing district Ci+1In carry out channel reservation, and in cell-of-origin CiAccess the call request.Otherwise, into step 403；
Step 403, based on time threshold tTHEach wave beam cell is divided into two regions of A and B, calculating the new calling please
Seek the position distribution of user；
tTH*VtrkIt is the distance of user distance wave beam cell handoff boundary；VtrkRepresent substar speed；
Region A is remote from the region of cell handoff boundary；Region B is the region of cell handoff boundary, the void in the region
It is invalid to intend channel reservation；
Whether step 404, the position distribution for judging the new call request user are source wave beam cell CiRegion A, if
It is, into step 405；Otherwise, whether the position distribution of new call request user is source wave beam cell CiRegion B, this is new
Call request is blocked；
Step 405, judge switching cell Ci+1Middle pseudo channel takes whether sum S is less than pseudo channel maximum quantity
Smax, if it is, into step 406；Otherwise, the new call request is blocked；
Smax=[(α k+ β) * C]
K is the accounting of high-priority users flow, 0≤k≤1；α, β are the scale factors of control ratio, are constant；
Step 406, it is the new call request in switching cell Ci+1In reserve a pseudo channel, and pseudo channel is accounted for
Add 1 with total S, by the new call request in cell-of-origin CiAccess.
Step 5, wave beam cell CiSelf adaptation is carried out to the call handover request of high-priority users overbooks channel
Distribution is processed, and is decided whether to switch the calling and is accessed；
Comprise the following steps that：
Step 501, the handover call request for high-priority users switch to wave beam cell Ci, judge that high priority is used
Whether family reaches wave beam cell CiHandoff boundary, if it is, into step 502；Otherwise, continue waiting for until arrival switching is small
Area CiHandoff boundary；
Step 502, it is judged as high-priority users call handover request in switching cell CiIn reserve whether be virtual
Channel, if it is, the call handover request is switched into call drop；Otherwise, into step 503；
Step 503, judge next switching cell Ci+1In whether there is idle channel, if it is, for the calling switching please
Ask in next switching cell Ci+1In carry out channel reservation, and in switching cell CiSwitch successfully；Otherwise, into step 504；
Step 504, judge next switching cell Ci+1Middle pseudo channel takes whether sum S is less than pseudo channel maximum number
Amount Smax, if it is, into step 505；Otherwise, the call handover request is switched into call drop；
Step 505, it is the call handover request in next switching cell Ci+1In reserve a pseudo channel, and will be virtual
Channel occupancy sum S adds 1, by the call handover request in switching cell CiSwitch successfully.
Step 6, wave beam cell CiCalling to terminating is processed, by the reservation request transfer on any pseudo channel
To the available channel shared by it.
Whenever having calling to terminate, system will shift calling in pseudo channel to available channel, while release should
Pseudo channel, pseudo channel takes sum S and subtracts 1.
Beneficial effects of the present invention are：
1) a kind of, position point overbooked LEO satellite system channel distribution method, introduce user terminal of self adaptation
Cloth factor (shows as time threshold), the setting of pseudo channel quantity in regulation TCRA-O strategies；It is cell handoff boundary to avoid
User reserve invalid pseudo channel and cause handoff failure, while being the significant distribution of user away from cell handoff boundary
Pseudo channel, it is to avoid its new calling is blocked.
2) a kind of, stream overbooked LEO satellite system channel distribution method, introduce high-priority users of self adaptation
The setting of pseudo channel quantity in amount accounting factor regulation TCRA-O strategies, in systems the flow accounting of high-priority users compared with
In the case of low, suitably reduce the setting of pseudo channel quantity to reduce handoff failure probability；Conversely, suitably increasing pseudo channel
Quantity is reducing new call blocking rate.
3), a kind of self adaptation overbooks LEO satellite system channel distribution method, position distribution based on user terminal
Two factors of flow accounting of factor and high-priority users are mutually restricted, and carry out the channel reservation of overbooking of self adaptation, energy
Enough ensure that the switching cutting off rate of high-priority users, close in the case of zero, obtains less new call blocking rate, lifting system
The service quality of entirety of uniting.
Brief description of the drawings
Fig. 1 is the network coverage figure of typical case's LEO satellite system of the invention；
Fig. 2 is the one-dimensional movement illustraton of model in LEO satellite system of the present invention；
Fig. 3 is time threshold t of the present inventionTHTo the region division situation map of cell；
Fig. 4 is the flow chart for overbooking LEO satellite system channel distribution method of self adaptation of the present invention；
Fig. 5 is the new calling access process figure of high-priority users of the present invention；
Fig. 6 is the switching calling access process figure of high-priority users of the present invention.
Specific embodiment
Specific implementation method of the invention is described in detail below in conjunction with the accompanying drawings.
In existing communication, the flow accounting of the position distribution and high-priority users for user terminal is not accounted for,
Influence of the two factors to selection best visual channel quantity, it is inappropriate virtual with the change of user's situation in system
Channel quantity is set can cause handover failure rate too high or the decline of new call blocking rate is not obvious, it is impossible to reach TCRA-O strategies
Estimated performance.It is improved on the TCRA-O strategies of existing self adaptation in the present invention, it is proposed that a kind of excess of self adaptation
Subscribe LEO satellite system channel distribution method, referred to as ATCR-O strategies.
ATCR-O strategies are mainly improved in the treatment to high-priority users compared to TCRA-O strategies.It is preferential for height
Level user, as shown in figure 4, the implementation process of channel distribution is comprised the following steps that：
Step one, the mobility model of LEO satellite system is set up, and set the condition of channel assignment strategy；
In view of the two-forty operating of relative LEO satellite, the motion of user and earth rotation can be ignored, Jiang Gebo
Shu little Qu is modeled as continuous rectangle cell, abbreviation one-dimensional movement model.As shown in Fig. 2 when a handover occurs, purpose cell
It is the next cell on satellite motion rightabout.Rectangle cell length L is generally equivalent to the diameter of wave beam cell, typically takes
425km。VtrkSubstar speed is represented, 26600km/h is typically taken.User passes through a time for full cell, is expressed as Tmax：
Based on above-mentioned mobility model, when channel assignment strategy research is carried out, typically using following classical assumption：
1), new calling is obeyed in the generation position of each wave beam cell and is uniformly distributed.
2), average call initiation rate is independently of number of calls in progress in each wave beam cell.
The arrival process of new calling and switching calling all obeys Poisson distribution, and the two is separate；Different characteristic (user
Terminal type, type of service) calling arrival process it is also separate.
3), call duration obeys exponential distribution.
4), the channel duration of each wave beam cell obeys exponential distribution.
In the LEO system models set up, it is assumed that the channel that number is C is assigned in each wave beam cell.ATCR-O
Treatment of the strategy to domestic consumer is consistent with TCRA-O strategies.Call setup and switching i.e. for domestic consumer carry out nothing
The management of priority：If there is idle channel in system, just the calling is accessed；Otherwise block new calls or termination are cut
Change calling.
Step 2, for wave beam cell Ci, initial time sets wave beam cell CiPseudo channel take sum S=0；
Step 3, the call request for certain high-priority users access wave beam cell Ci, judge that the call request is new
Call request or handover call request, if new call request, into step 4, otherwise, into step 5；
Step 4, wave beam cell CiSelf adaptation is carried out to the new call request of high-priority users overbooks channel point
With treatment, decide whether to access the new call request；
New calling is accessed：System first determines whether cell-of-origin C after the new call request for receiving useriIn whether there is
Idle channel.If being blocked without if, switching cell C is then judged if havingi+1In whether there is idle channel, if having
It is the calling in switching cell Ci+1In carry out channel reservation and in cell-of-origin CiAccess the calling.Otherwise, the calling is carried out certainly
What is adapted to overbooks channel reservation, and idiographic flow is as follows：It is primarily based on time threshold tTHJudge the position of the new calling party
Distribution；If new calling party is located at cell-of-origin CiRegion B, then blocked；If new calling party is located at cell-of-origin CiRegion
A, then whether pseudo channel takes sum S less than pseudo channel maximum quantity S in judging current areamax；If S is less than Smax, then
It is the calling in switching cell Ci+1In reserve a pseudo channel, and by pseudo channel occupancy sum S add 1, by the calling in source
Cell is accessed；If S is more than or equal to Smax, then by the call congestion, in order to avoid excessive virtual channel reservation causes to switch call drop
Rate rises.
As shown in figure 5, comprising the following steps that：
Step 401, system the wave beam cell C after the new call request for receiving high-priority users is accessedi, first determine whether
Cell-of-origin CiIn whether there is idle channel, if it is, into step 402；Otherwise, the new call request is blocked；
Step 402, judge switching cell Ci+1In whether there is idle channel, if it is, for the new call request is being cut
Changing district Ci+1In carry out channel reservation, and in cell-of-origin CiAccess the call request.Otherwise, into step 403；
Step 403, based on time threshold tTHEach wave beam cell is divided into two regions of A and B, calculating the new calling please
Seek the position distribution of user；
As shown in figure 3, user passes through a time for full cell for Tmax, so, tTH*VtrkIt is that user distance wave beam is small
The distance of area's handoff boundary；VtrkRepresent substar speed；
Region A is remote from the region of cell handoff boundary；Region B is the region of cell handoff boundary, the void in the region
It is invalid to intend channel reservation, and the highspeed user in the B of region will quickly face switching, is that it carries out virtual channel reservation and very may be used
Its handoff failure can be caused.
Whether step 404, the position distribution for judging the new call request user are source wave beam cell CiRegion A, if
It is, into step 405；Otherwise, whether the position distribution of new call request user is source wave beam cell CiRegion B, this is new
Call request is blocked；
Show in the condition of channel assignment strategy：New calling is obeyed in the generation position of cell-of-origin and is uniformly distributed.
Step 405, judge switching cell Ci+1Middle pseudo channel takes whether sum S is less than pseudo channel maximum quantity
Smax, if it is, into step 406；Otherwise, the new call request is blocked；
Smax=[(α k+ β) * C]
K is the accounting of high-priority users flow, 0≤k≤1；α, β are the scale factors of control ratio, are constant；According to
Empirical value is chosen.
With increasing for high-priority users flow accounting, the virtual channel resources for using are allowed to increase in switching cell,
For the new calling of high-priority users provides more access chances.
Step 406, it is the new call request in switching cell Ci+1In reserve a pseudo channel, and pseudo channel is accounted for
Jia 1 with sum, by the new call request in cell-of-origin CiAccess.
Step 5, wave beam cell CiSelf adaptation is carried out to the call handover request of high-priority users overbooks channel
Distribution is processed, and is decided whether to switch the calling and is accessed；
Calling switching：System switches to C receiving itiAfter the request of cell, user can be waited to reach C firstiCell
Handoff boundary, is then judged as it in CiWhether what is reserved in cell is pseudo channel；If being still pseudo channel, this is switched
Call drop.If not pseudo channel, then judge next cell Ci+1In whether be free idle channel, if so, then in Ci+1Being in cell should
The switching calling of calling carries out channel reservation, and allows the calling to switch to CiCell.If no, being switched into for the calling
Row self adaptation overbooks channel reservation.
It should be noted that for call handover request, relative users are apart from next cell Ci+1Handoff boundary
Time is all Tmax；Then for calling switching user, it is always located in CiThe region A of cell.
As shown in fig. 6, comprising the following steps that：
Step 501, the handover call request for high-priority users switch to wave beam cell Ci, judge that high priority is used
Whether the call handover request at family reaches wave beam cell CiHandoff boundary, if it is, into step 502；Otherwise, continue waiting for
Until reaching switching cell CiHandoff boundary；
Step 502, it is judged as high-priority users call handover request in switching cell CiIn reserve whether be virtual
Channel, if it is, the call handover request is switched into call drop；Otherwise, into step 503；
If it is, user is actual switch over when do not wait until available channel also.Otherwise, user is actually being cut
Available actual channel is alternatively preceding waited until.
Step 503, judge next switching cell Ci+1In whether there is idle channel, if it is, for the calling switching please
Ask in next switching cell Ci+1In carry out channel reservation, and in switching cell CiSwitch successfully；Otherwise, into step 504；
Step 504, judge next switching cell Ci+1Middle pseudo channel takes whether sum S is less than pseudo channel maximum number
Amount Smax, if it is, into step 505, channel reservation is overbooked for what the call handover request carried out self adaptation；Otherwise, will
The call handover request switches call drop；
Step 505, it is the call handover request in next switching cell Ci+1In reserve a pseudo channel, and will be virtual
Channel occupancy sum S adds 1, by the call handover request in switching cell CiSwitch successfully.
Step 6, wave beam cell CiCalling to terminating is processed, and determines how to distribute the channel that the calling takes.
Identical with TCRA-O strategies, whenever having calling to terminate, system will shift calling in pseudo channel to can use
On channel, while discharging the pseudo channel, pseudo channel takes sum S and subtracts 1.
The present invention is according to two factor self adaptations of flow accounting of the position distribution of user terminal and high-priority users
The setting of pseudo channel quantity in regulation TCRA-O strategies, processes new calling and the switching calling procedure of high-priority users, obtains
Take optimal system service quality.
Claims (4)
1. a kind of self adaptation overbooks LEO satellite system channel distribution method, it is characterised in that comprise the following steps that：
Step one, the mobility model of LEO satellite system is set up, and set the condition of channel assignment strategy；
Step 2, for wave beam cell Ci, initial time sets wave beam cell CiPseudo channel take sum S=0；
Step 3, the call request for certain high-priority users access wave beam cell Ci, judge that the call request is that new calling please
Ask or handover call request, if new call request, into step 4, otherwise, into step 5；
Step 4, wave beam cell CiOverbooking at channel distribution for self adaptation is carried out to the new call request of high-priority users
Reason, decides whether to access the new call request；
Step 5, wave beam cell CiSelf adaptation is carried out to the call handover request of high-priority users overbooks channel distribution
Treatment, decides whether to switch the calling and accesses；
Step 6, wave beam cell CiCalling to terminating is processed, and the reservation request on any pseudo channel is transferred into its institute
On the available channel of occupancy；
Whenever having calling to terminate, system will shift calling in pseudo channel to available channel, while it is virtual to discharge this
Channel, pseudo channel takes sum S and subtracts 1.
2. a kind of as claimed in claim 1 self adaptation overbooks LEO satellite system channel distribution method, and its feature exists
In described step one is specially：
Each wave beam cell is modeled as continuous rectangle cell, abbreviation one-dimensional movement model；It is assigned in each wave beam cell
Number is the available channel of C；
Based on mobility model, when carrying out channel assignment strategy research, using hypothesis below：
1) new calling is obeyed in the generation position of each wave beam cell and is uniformly distributed；
2) average call initiation rate is independently of number of calls in progress in each wave beam cell；
The arrival process of new calling and switching calling all obeys Poisson distribution, and the two is separate；The calling of different characteristic is arrived
It is also separate up to process；
3) call duration obeys exponential distribution；
4) channel duration of each wave beam cell obeys exponential distribution.
3. a kind of as claimed in claim 1 self adaptation overbooks LEO satellite system channel distribution method, and its feature exists
In described step four is comprised the following steps that：
Step 401, system the wave beam cell C after the new call request for receiving high-priority users is accessedi, first determine whether that source is small
Area CiIn whether there is idle channel, if it is, into step 402；Otherwise, the new call request is blocked；
Step 402, judge switching cell Ci+1In whether there is idle channel, if it is, for the new call request switch it is small
Area Ci+1In carry out channel reservation, and in cell-of-origin CiAccess the call request；Otherwise, into step 403；
Step 403, based on time threshold tTHEach wave beam cell is divided into two regions of A and B, the new call request is calculated and is used
The position distribution at family；
tTH*VtrkIt is the distance of user distance wave beam cell handoff boundary；VtrkRepresent substar speed；
Whether step 404, the position distribution for judging the new call request user are source wave beam cell CiRegion A, if it is, entering
Enter step 405；Otherwise, whether the position distribution of new call request user is source wave beam cell CiRegion B, by the new calling please
Seek obstruction；
Step 405, judge switching cell Ci+1Middle pseudo channel takes whether sum S is less than pseudo channel maximum quantity Smax, such as
Fruit is, into step 406；Otherwise, the new call request is blocked；
Smax=[(α k+ β) * C]
K is the accounting of high-priority users flow, 0≤k≤1；α, β are the scale factors of control ratio, are constant；
Step 406, it is the new call request in switching cell Ci+1In reserve a pseudo channel, and pseudo channel is taken total
Number S adds 1, by the new call request in cell-of-origin CiAccess.
4. a kind of as claimed in claim 1 self adaptation overbooks LEO satellite system channel distribution method, and its feature exists
In described step five is comprised the following steps that：
Step 501, the handover call request for high-priority users switch to wave beam cell Ci, judge that high-priority users are
No arrival wave beam cell CiHandoff boundary, if it is, into step 502；Otherwise, continue waiting for until reaching switching cell Ci
Handoff boundary；
Step 502, it is judged as high-priority users call handover request in switching cell CiIn reserve whether be pseudo channel,
If it is, the call handover request is switched into call drop；Otherwise, into step 503；
Step 503, judge next switching cell Ci+1In whether there is idle channel, if it is, for the call handover request exists
Next switching cell Ci+1In carry out channel reservation, and in switching cell CiSwitch successfully；Otherwise, into step 504；
Step 504, judge next switching cell Ci+1Middle pseudo channel takes whether sum S is less than pseudo channel maximum quantity
Smax, if it is, into step 505；Otherwise, the call handover request is switched into call drop；
Step 505, it is the call handover request in next switching cell Ci+1In reserve a pseudo channel, and by pseudo channel
Take sum S and add 1, by the call handover request in switching cell CiSwitch successfully.
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