CN1761354A - Implementation method for switching arranged resources in mobile communication system - Google Patents

Implementation method for switching arranged resources in mobile communication system Download PDF

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CN1761354A
CN1761354A CN 200410080893 CN200410080893A CN1761354A CN 1761354 A CN1761354 A CN 1761354A CN 200410080893 CN200410080893 CN 200410080893 CN 200410080893 A CN200410080893 A CN 200410080893A CN 1761354 A CN1761354 A CN 1761354A
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resource
time slot
thresholding
sub
district
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CN100399859C (en
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周德锁
赵瑾波
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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Abstract

The disclosed method is a mixed implementation method of switching resources in sub zone prearranged in advance and switching resources in time slot prearranged in advance. The invention includes steps: first, executing determination in sub zone level, determining whether idle resource on the current sub zone meets to requirement of prearranged threshold after taking up the new call; if no, refusing the requirement; if yes, then executing determination of time slot level right along; the method determines whether idle resource of time slot meets to requirement of prearranged time slot threshold after taking up the new call or determines whether idle resource of current time slot meets to requirement requested from the switched call; if yes, then taking up the switched call; if no, then re-determining whether to take up the switched call after adjusting each time slot resource. Based on real time load in network, the system adjusts prearranged switching resource dynamically.

Description

The implementation method of switching arranged resources in the mobile communication system
Technical field
The present invention relates to the control technology in cell mobile communication systems allocation of radio resources and the handover, relate to the method for obligating in time division duplex/code division multiple access (TDD-CDMA) mobile communication system or rather for sub-district switch call reservation Radio Resource, this method should guarantee handover success rate, guarantees the user's communications quality and reduce cutting off rate, avoids the admittance success rate that causes the wasting of resources, resource utilization ratio decline because of irrational reservation and influence new user simultaneously again.
Background technology
In mobile communication system, user terminal might leave the service range that the service range of this sub-district enters another sub-district, generation handover procedure owing to a variety of causes after realizing initial sub-district and network is connected.Handover procedure in the TD-SCDMA system is exactly to switch to other sub-district by the connection with user terminal, thereby makes service can not produce interruption.For continuity and the stability that guarantees that the user converses in moving process, each sub-district in the cell mobile communication systems is generally switch call and reserves a part of Radio Resource, to improve user's handover success rate.This part uses for the Radio Resource of sub-district handoff reservation can only be switched the user, makes a call, asks the new user that admits and can not distribute in this sub-district.
In the existing first generation and second generation mobile communication system, the form of its Radio Resource shows as frequency and time slot, thereby system mainly is frequency and time slot for switching user's reserved resource.In 3-G (Generation Three mobile communication system) such as Wideband Code Division Multiple Access (WCDMA) (WCDMA) and CDMA1X system, owing to adopt the access way of code division multiple access, thereby introduced spread spectrum code resources, and general cdma system has tangible power limited characteristics, so system mainly is a power resource for switching user's reserved resource.
Existing mobile communication system adopts the fixing mode of reserving of cell radio resource usually, is that unit fixedly reserves the resource of some for switching user's use with each sub-district promptly.
The TD-SCDMA system is the resource that unit fixedly reserves some with the time slot promptly because its TDD has adopted the fixing mode of reserving (seeing " TD-SCDMA standard ") of slotted radio resource, carries out user admission judgment.
The implementation procedure of switching arranged resources is mainly reflected in new user and switches on user's the admittance control procedure, as a kind of strategy that calculates and judge, the specific implementation flow process of existing sub-district reservation mode generally as shown in Figure 1, the specific implementation flow process of existing time slot reservation mode is generally as shown in Figure 2.
Referring to Fig. 1, suppose T constantly, the customer call request arrives, and the application number of resources is designated as R q, this moment this sub-district the Resources allocation number scale be R T, be limited to R on the available resources number Th, the sub-district is that the number of resources of handoff reservation is fixed as R S
Step 11, at T constantly, the customer call request arrives;
Step 12 is judged this call request classification, judges that promptly this call request is new user's admittance request or the admittance request of switching the user;
Step 13, if new user's admittance request, then by calculating R q, R TSum and R Th, R SDifference between magnitude relationship decide and admit this new user or its request of refusal, when satisfying R q+ R T＞R Th-R SThe time, please number of resources in the explanation count sum and count the poor of the upper limit and handoff reservation number of resources greater than available resources with Resources allocation, can not admit execution in step 17, otherwise execution in step 14;
Step 14 is because R q+ R T＜R Th-R S, the application number of resources is counted sum with Resources allocation and is also counted the poor of the upper limit and handoff reservation number of resources less than available resources, therefore can admit this user to ask, and be its distributing radio resource.
Step 15 is the admittance request of switching the user if judge this call request in step 12, then by calculating R q, R TSum of the two and R ThBetween magnitude relationship decision be to admit this switchings user or its request of refusal, when satisfying R q+ R T＞R ThThe time, illustrate that the application number of resources counts sum with Resources allocation and count the upper limit greater than available resources, can not admit execution in step 17, otherwise execution in step 16;
Step 16 is because R q+ R T＜R Th, illustrate that the application number of resources counts sum with Resources allocation and also count the upper limit less than available resources, therefore admit this switchings user to ask, and be its distributing radio resource.
Step 17 is because R has been satisfied in new user's access request q+ R T＞R Th-R S, perhaps satisfied R owing to switch user's access request q+ R T＞R ThSo, refuse new user or switching user's call request.
Referring to Fig. 2, suppose T constantly, the customer call request arrives, and the application number of resources is designated as R q, in this moment time slot i the Resources allocation number scale be R i T, the upper limit of available resources number is designated as R in the time slot i i Th, be designated as R ' for the number of resources of handoff reservation in the time slot i S
Step 201, at T constantly, the customer call request arrives;
Step 202, priority according to time interval resource, select the highest time slot of priority to carry out acceptance judging, the priority of time interval resource can sort out according to factors such as interference, the priority of disturbing little time slot is greater than the priority of disturbing big time slot, just be higher than the priority of cross time-slot as the priority of non-cross time-slot, the priority of time interval resource also can be with fixedly sortord or alternate manner generation;
Step 203 is judged this call request classification, judges that promptly this call request is new user's admittance request or the admittance request of switching the user;
Step 204, if new user's admittance request, then by calculating R ' q, R i TSum and R i Th, R ' SDifference between magnitude relationship decision be to admit this new user or its request of refusal, when satisfying R ' q+ R i T＞R i Th-R ' SThe time, illustrate if in time slot i, apply for number of resources R ' qWith in the time slot i Resources allocation count R i TSum is greater than the upper limit R of available resources number in the time slot i i ThBe the number of resources R ' of handoff reservation in the time slot i SPoor, then can not admit execution in step 205, otherwise execution in step 210 in the time slot i;
Step 205 is because R ' q+ R i T＞R i Th-R ' S, illustrate that the surplus resources in time slot i has been not enough to satisfy the demand of new user to resource, then further judge whether to also have the time slot except that the i time slot can supply acceptance judging, then execution in step 206 is arranged, otherwise execution in step 211;
Step 206 is selected the time slot except that the i time slot, carries out acceptance judging, and returns step 203 and carry out.
Step 207 is the admittance request of switching the user if judge this call request in step 203, then by calculating R ' q, R i TSum and R i ThBetween magnitude relationship decision be to admit this switchings user or its request of refusal, when satisfying R ' q+ R i T＞R i ThThe time, illustrate if apply in time slot i in number of resources R ' x and the time slot i that Resources allocation is counted R i TSum is greater than the upper limit R of available resources number in the time slot i i Th, then can not admit execution in step 208, otherwise execution in step 210 in the time slot i;
Step 208 is because R ' q+ R i T＞R i Th, illustrate that the surplus resources in time slot i has been not enough to satisfy the demand of switching user to resource, then further judge whether to also have the time slot except that the i time slot can supply acceptance judging, then execution in step 209 is arranged, otherwise execution in step 211;
Step 209 is selected the time slot except that the i time slot, carries out acceptance judging, and returns step 203 and carry out.
Step 210 is because new user's R ' q+ R i T＜ i Th-R ' S, perhaps owing to switch user's R ' q+ R i T＜R i Th, then admit this new user or switching user's call request, and be new user or switching user resource allocation in time slot i.
Step 211 is because new user's R ' q+ R i T+ R i Th-R ' S, perhaps owing to switch user's R ' q+ R i T＞R i Th, and do not had any time slot and can be used as acceptance judging, then refuse this new user or switch user's call request.
Reserve except that above-mentioned sub-district is fixing and time slot fixedly the reservation schemes, the disclosed switching arranged resources implementation of available data also comprises: according to the definite resource reservation ratio of service quality (QoS) requirement of different business; Arrive frequency definite resource reservation ratios such as (the professional number of times that arrives of unit interval) according to business; Or come computational resource reservation ratio etc. (to see " research of radio multimedium network resource management ", literature search numbering: Y392076-TN919.85) according to the ratio that the switch call of being added up in nearest a period of time window accounts for total calling.
In sum, what the existing resource method for obligating mainly adopted is the resource reservation mode of fixed proportion, this mode can not be come the optimization system resource distribution according to factors such as the load condition of sub-district, bearer service type, mobile environment variations, thereby often cause two kinds of situations to take place: if reserved resource is very few, then can not satisfy in the network demand of switching the user, cause in the system conversation loss phenomenon serious; If too much for switching user's reserved resource, the corresponding minimizing of resource of then leaving new user for, the success rate of new user admission must reduce, and resource utilization ratio descends.Therefore, Gu Ding resource reservation mode can not guarantee that system is in the poised state that reaches comprehensive optimum aspect cutting off rate, admittance success rate and the resource utilization three.
The diversified business of 3G system bearing, the speed of miscellaneous service and service time difference are very big, no matter are that simple sub-district is reserved or the time slot reservation schemes, if adopt these fixedly methods of reserved resource, the optimal proportion of control resource reservation is very difficult; And according to Forecasting Methodology is adopted in the Information Statistics of switching the user, also can not be accurately concerning carrying multiple services system.Above-mentioned aspect has caused resource utilization ratio and has admitted performance index such as success rate, blocking rate and handover success rate to be difficult to reach the system optimal state.
And on the other hand, the switching arranged resources of TDD system has higher flexibility, the mode that it both can take the sub-district to reserve, the mode of slot reservation in the time of also can adopting;
The TD-SCDMA system is a tdd systems, and because TD-SCDMA has adopted technology such as uplink synchronous, joint-detection, smart antenna, the influence that multiple access disturbs and multipath disturbs alleviates greatly.Therefore, under the rational prerequisite of the network planning, interference and power no longer have been the principal elements of system for restricting capacity and performance.Each time slot of TD-SCDMA system has only 16 code channels to use simultaneously at most, therefore an important feature of TD-SCDMA system is theory and the notion reduction that makes traditional cdma system power limited, and it is then very obvious that system resource becomes the limited situation of code channel.Acceptance controlling method based on interference and power no longer is the acceptance controlling decision method of TD-SCDMA system the best, promptly for the TD-SCDMA system, the feature of cdma system soft capacity is no longer obvious, and has become the optimal way that this system admits control based on the hard decision of code channel resource.Emulation and experiment show, system adopts this acceptance controlling method, with compare with the acceptance controlling method of power based on disturbing, have the advantages of simplicity and high efficiency characteristics, and the Key Performance Indicators such as admittance success rate, handover success rate and resource utilization of system are improved all;
Consider that from satisfying system requirements the ratio of handoff reservation should determine jointly according to factors such as traffic intensity, class of service, system loadings.
Above-mentioned factor has been decided technical foundation for realizing the solution of the present invention allusion quotation.
Summary of the invention
The objective of the invention is to design the implementation method of the switching arranged resources in a kind of mobile communication system, by designing a kind of rational resource reservation scheme, can guarantee to switch user's handover success rate, guarantee the user's communications quality, minimizing system cutting off rate can be avoided again simultaneously taking place having reserved too much resource and causing waste, resource utilization ratio decline and influence new user's problems such as admittance success rate to switching the user.
The technical scheme that realizes the object of the invention is such:. the implementation method of switching arranged resources in a kind of mobile communication system is characterized in that: be the mixing implementation method that the sub-district switching arranged resources combines with the time slot switching arranged resources, comprise:
A. for new call request, according to the Rule of judgment of cell level, whether the idling-resource of current area satisfies the requirement of sub-district handoff reservation resource thresholding after this new call request of judgement admittance; For handover call request,, judge whether the idling-resource of current area satisfies the requirement of this handover call request to local resource according to the Rule of judgment of cell level; If do not satisfy, then refusal this new call request, refuse this handover call request, if satisfied then continue execution in step B;
B. judging whether all alternative time slots have all been carried out acceptance judging successively, is execution in step D then, otherwise execution in step C;
C. from alternative time slot, select a time slot, according to timeslot-level other Rule of judgment, for new call request, after this new call request is admitted in judgement, by whether idle time interval resource behind its distribution time interval resource satisfies the requirement of time slot handoff reservation resource thresholding; For handover call request,, judge whether the idling-resource of current time slots satisfies the requirement of this handover call request to time interval resource according to timeslot-level other Rule of judgment; If meet the demands, then admit this new call request, admit this switch call request at this time slot at this time slot, if do not satisfy, then return step B;
D. the resource of described alternative time slot is readjusted, returned step B then and carry out.
In the described steps A, for handover call request, according to the Rule of judgment of cell level, whether the idling-resource of judging current area satisfies the requirement of this handover call request to local resource, if do not satisfy, then refuse this handover call request, if satisfy then the described step B of continuation execution;
Among the described step C, for handover call request, according to timeslot-level other Rule of judgment, whether the idling-resource of judging current time slots satisfies the requirement of this handover call request to time interval resource, if meet the demands, then admit this handover call request,, then return described step B if do not satisfy at this time slot.
Described sub-district handoff reservation resource thresholding and time slot handoff reservation resource thresholding all comprise the reservation thresholding of power and code channel resource; The reservation thresholding of described code channel resource is expressed as the code channel number of reservation or is expressed as the preset code-channel number and the ratio of total code channel number; The reservation thresholding of described power resource is expressed as the ratio that power resource accounts for the gross power resource of reserving.
Use of the present invention sub-district reserve with the time slot reservation mixing reserved resource scheme that combines compare with existing reserved resource scheme, owing to taken into full account TDD/CDMA (as TD-SCDMA) system's time division duplex and the limited characteristics of code channel, both considered the sub-district reservation, again in conjunction with the time slot reservation, both considered to reserve power resource, consider the preset code-channel resource again, thereby be more suitable for TDD/CDMA (as TD-SCDMA) system.
After adopting this mixing method for obligating resource, system can be according to the real-time load condition of network, the multiple business situation of being carried and different mobile environment etc., resource reservation in switching comprises sub-district switching arranged resources and time slot switching arranged resources, makes real-time dynamic adjustment.
Simulation result shows, compares with existing fixed resource reservation mode, and this method had both reduced system's cutting off rate, had improved new user's admittance success rate and usage factor of system resource again.
Compare with traditional method for obligating resource, no matter mixing method for obligating resource of the present invention is also to be non-Hot Spot at Hot Spot, corresponding thresholding can be set as required, thereby can obtain systematic function preferably.
Description of drawings
Fig. 1 is the concrete admittance control flow block diagram of existing sub-district reservation mode;
Fig. 2 is the concrete admittance control flow block diagram of existing time slot reservation mode;
The concrete admittance control flow block diagram of the mixing reservation mode that slot reservation combined with the sub-district reservation when Fig. 3 was of the present invention the use.
Embodiment
The embodiment of the invention according to the limited characteristics of TD-SCDMA system code channel, when proposing to do resource reservation for switch call, the resource reservation based on the power form in considering general cdma system, has also been considered the resource reservation based on the code channel form.As the sub-district is that the resource of handoff reservation both can be a power, also can be the code channel number.
Simultaneously, the TD-SCDMA system is again a tdd systems, therefore can consider with the time slot to be that unit is the switch call reserved resource; Can also be in conjunction with existing method, the reservation of employing sub-district and the time slot reservation mode that combines.In realization, can consider to set two class thresholdings: sub-district switching arranged resources thresholding and time slot switching arranged resources thresholding; This two classes thresholding all comprises power and code channel two aspect implications.Both can be expressed as the code channel number of reservation for the reservation thresholding of code channel resource, can be expressed as the ratio that the preset code-channel number accounts for total code channel number again; And the reservation thresholding of power resource is represented with the percentage form usually, promptly reserves the ratio that power resource accounts for the gross power resource.
The setting of above-mentioned various thresholdings has influence on network performance indexes such as handover success rate, cutting off rate, call successful rate, can be the suitable initial value of each cell setting in the network planning; In service in network reality, can also dynamically adjust by the network maintenance staff by wireless resource management algorithm or network optimized approach as required.
When new user (user who makes a call in this sub-district) application was admitted, after this user was admitted in judgement, whether the surplus resources of current area satisfied sub-district switching arranged resources thresholding; If do not satisfy, then refuse this user's request.If satisfy, after then further this user is admitted in judgement, whether satisfy the requirement of time slot switching arranged resources thresholding for the remaining time interval resource of the time slot of this user resource allocation; If do not satisfy, then refuse this user's request; If satisfy, then allow this user admission.
When switching the user applies admittance, if the surplus resources of current area can not satisfy it to the requirement of resource then refuse this user's request, if the surplus resources of current area can satisfy its requirement to resource, judge further then whether the remaining resource of current time slots satisfies its requirement to resource, admit if satisfy then allow, otherwise refuse this handoff request.
Referring to Fig. 3, suppose T constantly, the customer call request arrives, and the application number of resources is R q, this moment this sub-district Resources allocation R T, be limited to R on the cell available resources Th, the sub-district is that the number of resources of handoff reservation is R S, time slot i (i=1,2,3 ... n, i are the timeslot numbers of reserved resource) in Resources allocation R i T, be limited to R on the time slot i available resources i Th, be R ' in the time slot i for the handoff reservation number of resources S
Adopt the mixing implementation of switching arranged resources, this user's admittance control procedure is shown in Fig. 3 step.
(1) when call request arrives, determines that at first new the calling still is switch call.Comprise:
Step 301, in the T moment, the customer call request arrives;
Step 302 is judged the call request classification, determines that new the calling still is switch call, is that step 303 execution is then changeed in new calling, is that step 312 execution is then changeed in switch call.
(2) according to cell available resources upper limit R Th, whether new calling or switch call are satisfied the judgement of cell level condition.Comprise:
Step 303 for new calling, is judged R q+ R T＞R Th-R S, current area idling-resource (R Th-R T) deduct cell-level reserved resource number (R Th-R T-R S) after, whether satisfy user's resource requirement R q(after promptly hypothesis inserted this new user, whether this sub-district idling-resource can also satisfy the requirement of cell-level switching arranged resources thresholding).Work as R q+ R T＞R Th-R S, promptly can not satisfy new user's resource requirement R q, then execution in step 310, otherwise execution in step 304.
Step 311 for switch call, is judged R q+ R T＞R Th, current area idling-resource (R Th-R T) whether satisfy user's resource requirement R qWork as R q+ R T＞R Th, promptly can not satisfy the resource requirement R that switches the user q, then execution in step 310, otherwise execution in step 312.
Step 310 for new calling, is worked as R q+ R T＞R Th-R SThe time, for switch call, work as R q+ R T＞R ThThe time, then refuse this customer call request.
(3), then select the highest time slot i of priority to carry out acceptance judging if the Rule of judgment of cell level all satisfies.The priority of time interval resource sorts out according to factors such as interference, and the priority of disturbing little time slot just is higher than the priority of cross time-slot greater than the priority of disturbing big time slot as the priority of non-cross time-slot.Comprise:
Step 304 to satisfying the new calling of cell level Rule of judgment, selects the highest time slot i of priority to carry out acceptance judging.
Step 312 to satisfying the switch call of cell level Rule of judgment, selects the highest time slot i of priority to carry out acceptance judging.
(4) according to time slot i available resources upper limit R i Th, whether new calling or switch call are satisfied the judgement of time slot level conditions.
1) for new calling, comprising:
Step 305 is judged R ' q+ R i T＞R i Th-R ' S, i.e. idling-resource (the R of current time slots i i Th-R i T) deduct timeslot-level reserved resource number (R i Th-R i T-R ' S) after whether satisfy user's resource requirement R ' q(after promptly hypothesis inserted this user, whether this time slot idling-resource can also satisfy timeslot-level switching arranged resources thresholding R ' SRequirement);
Step 306 is when satisfying R ' q+ R i T＞R i Th-R ' S, i.e. idling-resource (the R of current time slots i i Th-R i T) deduct timeslot-level reserved resource number (R i Th-R i T-R ' S) after can not satisfy new user to the requirement of resource (R ' q), then execution in step 306, otherwise execution in step 309;
Step 306 judges whether that other time slot (than the low time slot of current judgement time slot priority) can be used for acceptance judging in addition, and having then changes step 307, does not then carry out 308;
Step 307 is with other time slots of selecting and return step 305 and carry out acceptance judging.Step 305,306,307 may be carried out repeatedly, carries out acceptance judging at other time slots successively, execution in step 309 when choosing the time slot that can admit, execution in step 308 when perhaps can not find any one time slot that can admit.
Step 309 is as R ' q+ R i T＜R i Th-R ' SThe time, i.e. idling-resource (the R of current time slots i i Th-R i T) deduct timeslot-level reserved resource number (R i Th-R i T-R ' S) after can also satisfy new user to the requirement of resource (R ' q), then admit this customer call request, and be its Resources allocation at this time slot i.
2), comprising for switch call:
Step 313 is judged R ' q+ R i T＞R i Th, i.e. idling-resource (the R of current time slots i i Th-R i T) whether satisfy the user resource required R ' q(after promptly hypothesis inserted this user, whether this time slot idling-resource can also satisfy timeslot-level switching arranged resources thresholding R ' SRequirement), when satisfying R ' q+ R i T＞R i Th, i.e. idling-resource (the R of current time slots i i Th-R i T) can not satisfy new user to the requirement of resource (R ' q), then execution in step 314, otherwise execution in step 309;
Step 314 judges whether that other time slot (than the low time slot of current judgement time slot priority) can be used for acceptance judging in addition, and having then changes step 315, does not then carry out 308;
Step 315 is with other time slots of selecting and return step 313 and carry out acceptance judging.Step 313,314,315 may be carried out repeatedly, carries out acceptance judging at other time slots successively, execution in step 309 when choosing the time slot that can admit, execution in step 308 when perhaps can not find any one time slot that can admit.
Step 309 is as R ' q+ R i TLess than R i ThThe time, i.e. idling-resource (the R of current time slots i i Th-R i T) can also satisfy switch the user to the requirement of resource (R ' q), then admit this customer call request, and be its Resources allocation at this time slot i.
(5) if, then admit control without any can then adjusting the resource of each time slot for the time slot of acceptance judging.Comprise:
Step 308, if all can not satisfying, the idling-resource of all time slots switches the requirement of user to resource, but truly have enough resources in the sub-district (by step 303,311, the sub-district idling-resource satisfies the requirement of user to resource), just, therefore can not admit, at this moment owing to be distributed in each time slot scatteredly, need readjust the resource of each time slot, then admit this user again.
Be that background further specifies the described method of Fig. 3 by two examples with the TD-SCDMA system below.
The ratio of embodiment 1. hypothesis uplink and downlink business time-slots is 3: 3, stipulates that each time slot is to switch the user to reserve 2 code channels, i.e. time slot switching arranged resources thresholding R i S=2; Stipulate in the whole sub-district to the code channel resource of handoff reservation is no less than 4 (folk prescription is to upstream or downstream), i.e. cell-level switching arranged resources thresholding R S=4.
When system loading is light, during all vacant 2 the above code channels of each time slot, each time slot preset code-channel number sum is 6, reserves thresholding 4 greater than cell-level, it is then inoperative substantially that this moment, cell-level was reserved thresholding;
If system is in the moderate load condition, sometime, owing to there is a switching user who takies 2 code channels to insert this sub-district, the preset code-channel of a time slot uses up, another time slot only is left to be 2 code channels of handoff reservation, consider that from timeslot-level switching arranged resources thresholding and cell-level switching arranged resources thresholding double standards the 3rd time slot only need be reserved 2 code channels.
By that analogy, if system loading is very heavy, two time slots being arranged owing to switch user's access is that the resource of handoff reservation has all accounted for time slot, the 3rd time slot, consider only to need to reserve 2 code channels from timeslot-level reservation thresholding angle, consider and reserve thresholding, also will reserve 4 code channels in the 3rd time slot from cell-level.
As seen, when system loading was heavier, the inventive method can better satisfy the resource requirement of switching the user, and the priority of switching the user is higher than this sub-district and initiates the new User Priority of calling out, and this meets the mobile communication system basic demand.
Embodiment 2, suppose that the ratio of up-downgoing business time-slot is 3: 3, stipulate that each time slot is to switch the user to reserve 2 code channels, i.e. time slot switching arranged resources thresholding R i S=2; Stipulate in the whole sub-district to the handoff reservation code channel resource is no less than 8 (folk prescription is to upstream or downstream), i.e. sub-district switching arranged resources thresholding R S=8.
When system loading is light, during all vacant 2 the above code channels of each time slot, because cell-level is reserved the control action of thresholding, at least to be 8 code channels of handoff reservation (folk prescription is to upstream or downstream) in the whole sub-district, and because the control action of timeslot-level reservation thresholding, each time slot is reserved 2 code channels enough supporting a voice service at least for switching.
If system is in the moderate load condition, sometime owing to there is a switching user who takies 2 code channels to insert this sub-district, the preset code-channel of a time slot uses up, another time slot only is left to be 2 code channels of handoff reservation, although from the angle of timeslot-level reservation thresholding, the 3rd time slot only need be reserved 2 code channels, yet, in order to guarantee in the whole sub-district that for the handoff reservation code channel resource is no less than 8, the 3rd time slot at least also will be reserved 6 code channels again.
Enter this sub-district if the video telephony user request that this moment, a speed was 64k is switched,, require the resource of in a time slot, distributing 8 code channels for this user according to the regulation in the 3GPP34.108 agreement; If is that unit carries out acceptance judging (referring to Fig. 2) in this sub-district with the time slot, because the code channel number of each time slot free time is all not enough, so this user's request will be rejected, and this user this time handoff request is unsuccessful.And if this moment this user at the channel quality of former sub-district severe exacerbation, do not have other sub-districts to switch again, call drop takes place possibly.
If but the method for pressing Fig. 3 of the present invention is considered this admittance request from the idling-resource of whole sub-district again, this handoff request is satisfiable.System can make 8 idle code channels all concentrate on a time slot by do resource adjustment (step 308) between each time slot of this sub-district, thereby just can admit this user's request (step 313,309).On this point, the mixing implementation method of this switching arranged resources can better guarantee the handover success rate of system, reduces cutting off rate.
By that analogy, if system loading is very heavy, two time slots being arranged owing to switch user's access is that the resource of handoff reservation has all accounted for time slot, so in order to satisfy the thresholding of sub-district reserved resource, also to reserve 8 code channels in the 3rd time slot, more switching user can also be inserted,, even the big band width service of speed more than 64Kbps can be admitted such as the voice service of speed at 8K, 12.2K.
As seen, variation along with system loading, the inventive method is the process that the number of handoff reservation resource presents a dynamic change, the system that guaranteed all has higher handover success rate and lower cutting off rate under the different load situation, and than in the past fixedly the method for reserved resource reduced because the waste that resource reservation quantity is too much brought.
Can see that by above-mentioned 2 embodiment the quantity of sub-district reserved resource is not to equal each single file time slot reserved resource quantity sum simply.The inventive method is to control the cell-level reserved resource in the prior art scheme singlely, is improved to cell-level and the dual control of timeslot-level reserved resource, in the hope of adapting to the complex situations of multi-service and system dynamics load better.
And can further conclude and draw: along with the difference of system loading, the dynamic rule of mixing method for obligating and be switch call reserved resource number is as follows:
When sub-district handoff reservation resource less than each time slot handoff reservation resource sum, be designated as R S < &Sigma; i = 1 K R S i The time, then from whole sub-district, reality for the minimum value of the resource of sub-district handoff reservation is: R S_min=R S, maximum is R S _ max = R S + &Sigma; i = 1 K R S i - min { R S i } , I=1 ... K; Wherein, min{.} represents the function of minimizing.When sub-district handoff reservation resource more than or equal to each time slot handoff reservation resource sum, be designated as R S &GreaterEqual; &Sigma; i = 1 K R S i The time, then from whole sub-district, reality for the minimum value of handoff reservation resource is R S _ min = &Sigma; i = 1 K R S i , Maximum is R S _ max = R S + &Sigma; i = 1 K R S i - min { R S i } .
Work as R S＜min{R ' SThe time, promptly cell-level reserved resource thresholding is less than the minimum value of timeslot-level reserved resource thresholding, and this moment, cell-level reserved resource thresholding was inoperative, and the inventive method is actual to develop into a kind of simple time slot method for obligating.
Use above-mentioned dynamic rule, when carrying out the network planning or optimizing, according to different system load of estimating and the different service types of being supported, consider the network performance indexes such as handover success rate, cutting off rate, call successful rate of all kinds of business, maximum, the minimum value of switchable resource quantity reserved in the uplink and downlink direction sub-district of making the sub-district actual needs respectively; Determine sub-district handoff reservation resource thresholding and time slot handoff reservation resource thresholding according to this maximum, minimum value, with the assurance system when the actual motion, for the resource quantity of handoff reservation can be subjected to the dual restriction of these two thresholdings and along with the variation of load dynamic change between the maximum of the switching arranged resources quantity of needs and minimum value adaptively.Above-mentioned reserved resource thresholding is the value of setting for algorithm, and reserved resource quantity then is in service in system, the actual Resource Unit number that plays a role.Set maximum and the minimum value of determining reserved resource quantity, the then dynamic change in the scope of this maximum and minimum value of reserved resource quantity by thresholding according to real network situation such as load condition.
Reserve maximum, the minimum value of switchable resource quantity according to the uplink and downlink direction sub-district of sub-district actual needs, the concrete grammar of determining sub-district handoff reservation resource thresholding and time slot handoff reservation resource thresholding can have following two kinds of schemes, supposes that the handoff reservation resource quantity minimum value of sub-district actual needs is R S_min, maximum is R S_max:
(1) obtains some groups of sub-district handoff reservation resource thresholding R according to following two formula SWith each time slot handoff reservation resource thresholding R ' SSub-district actual handoff reservation resource quantity minimum value R S_min=R SWith sub-district actual handoff reservation resource quantity maximum R S _ max = R S + &Sigma; i = 1 K R S i - min { R S i } , Time slot i=1 ... K, min{.} represent the function of minimizing; Then according to sub-district handoff reservation resource thresholding R SWhether less than each time slot handoff reservation resource thresholding R ' SSum judges whether respectively organize thresholding reasonable, if R S < &Sigma; i = 1 K R S i , It is reasonable then should to organize thresholding, otherwise it is unreasonable to organize thresholding, can not use;
(2) obtain some groups of sub-district handoff reservation resource thresholding R according to following two formula SWith each time slot handoff reservation resource thresholding R ' SThe actual reservation in sub-district switchable resource quantity minimum value R S _ min = &Sigma; i = 1 K R S i ; The actual reservation in sub-district switchable resource quantity maximum R S _ max = R S + &Sigma; i = 1 K R S i - min { R S i } , Time slot i=1 ... K, min{.} represent the function of minimizing; Then whether be not less than each time slot handoff reservation resource thresholding R ' according to sub-district handoff reservation resource thresholding RS SSum judges whether respectively organize thresholding reasonable; If R S &GreaterEqual; &Sigma; i = 1 K R S i The time, this group thresholding is reasonable, otherwise it is unreasonable to organize thresholding, can not use.
More than be that example illustrates method of the present invention with the TD-SCDMA mobile communication, time slot reservation and sub-district that the present invention describes are reserved the switching arranged resources that combines and are mixed implementation method, are equally applicable to other TDD mobile communication system.
The inventive method is for the switch call reserved resource time, adopt the method that cell-level is reserved and timeslot-level reservation combines, set cell-level reserved resource and timeslot-level reserved resource two class thresholdings respectively, when switch call application Resources allocation, except satisfying time slot reserved resource thresholding, also to satisfy sub-district reserved resource thresholding.
The method according to this invention, arbitrary sub-district are dynamically changeables for the code channel resource that switches user's reservation at any time; This reserved resource not only comprises power resource but also comprise code channel resource; The time during slot reservation, can make whole time slots all reserve a certain proportion of resource, also can make part time slot reserved resource, each time slot can be reserved the resource of same ratio, also can reserve the resource of different proportion.
In the inventive method, the various thresholdings of setting can be the suitable initial value of each cell setting in the network planning; In the network operation, dynamically adjust by wireless resource management algorithm inside or by means such as the network optimizations as required again.

Claims (14)

1. the implementation method of switching arranged resources in the mobile communication system is characterized in that: be the mixing implementation method that the sub-district switching arranged resources combines with the time slot switching arranged resources, comprise:
A. for new call request, according to the Rule of judgment of cell level, whether the idling-resource of current area satisfies the requirement of sub-district handoff reservation resource thresholding after this new call request of judgement admittance, if do not satisfy, if then refusal this new call request is satisfied then continue execution in step B;
B. judging whether all alternative time slots have all been carried out acceptance judging successively, is execution in step D then, otherwise execution in step C;
C. from alternative time slot, select a time slot, according to timeslot-level other Rule of judgment, after judging this new call request of admittance, by whether idle time interval resource behind its distribution time interval resource satisfies the requirement of time slot handoff reservation resource thresholding, if meet the demands, then admit this new call request,, then return step B if do not satisfy at this time slot;
D. the resource of described alternative time slot is readjusted, returned step B then and carry out.
2. method according to claim 1 is characterized in that: in the described steps A, and described Rule of judgment according to cell level, whether the idling-resource of current area satisfies the requirement of sub-district handoff reservation resource thresholding after this new call request of judgement admittance, is to judge R q+ R T＞R Th-R S, R wherein qBe the resource of new call request, R TBe current area Resources allocation, R TnBe the current area available resources upper limits, R SBe that current area is the resource of handoff reservation; Work as R q+ R T＞R Th-R SThe time, be judged as and can not satisfy.
3. method according to claim 1, it is characterized in that: among the described step C, according to timeslot-level other Rule of judgment, after this new call request is admitted in judgement, by whether idle time interval resource behind its distribution time interval resource satisfies the requirement of time slot handoff reservation resource thresholding, be to judge R q'+R i T＞R i Th-R S', R wherein q' be the time interval resource of new call request, R i TBe current time slots i Resources allocation, R i ThBe the available resources upper limit of current time slots i, R S' be that current time slots i is the resource of handoff reservation; Work as R q'+R i T＞R i Th-R SIn ' time, be judged as and satisfy.
4. method according to claim 1 is characterized in that further comprising:
In the described steps A, for handover call request, according to the Rule of judgment of cell level, whether the idling-resource of judging current area satisfies the requirement of this handover call request to local resource, if do not satisfy, then refuse this handover call request, if satisfy then the described step B of continuation execution;
Among the described step C, for handover call request, according to timeslot-level other Rule of judgment, whether the idling-resource of judging current time slots satisfies the requirement of this handover call request to time interval resource, if meet the demands, then admit this handover call request,, then return described step B if do not satisfy at this time slot.
5. method according to claim 4 is characterized in that in the described steps A, according to the Rule of judgment of cell level, judges whether the idling-resource of current area satisfies the requirement of this handover call request to local resource, is to judge R q+ R T＞R Th, R wherein qBe the resource of handoff request, R TBe current area Resources allocation, R ThBe the current area available resources upper limits; Work as R q+ R T＞R ThThe time, be judged as and can not satisfy.
6. method according to claim 4 is characterized in that among the described step C, according to timeslot-level other Rule of judgment, judges whether the idling-resource of current time slots satisfies the requirement of this handover call request to time interval resource, is to judge R q'+R i T＞R i Th, R wherein q' be the time interval resource of handover call request, R i TBe current time slots i Resources allocation, R i ThIt is the available resources upper limit of current time slots i; Work as R q'+R i T＞R i ThThe time, be judged as and can not satisfy.
7. method according to claim 1 is characterized in that: among the described step B, all alternative time slots being carried out acceptance judging successively, is that the prioritization by time slot begins in sequence from limit priority.
8. method according to claim 1 is characterized in that: among the described step D time interval resource being adjusted, is by the resource in each time slot being redistributed, the idling-resource in each time slot being concentrated in certain time slot.
9. method according to claim 1, it is characterized in that: described sub-district handoff reservation resource thresholding and time slot handoff reservation resource thresholding, be according to comprising that the network performance of handover success rate, cutting off rate, call successful rate determines initial value when the network planning, when system's actual motion, dynamically adjust as required again, comprising:
Be in system under the situation of slight load, certain single file direction allows sub-district switching arranged resources thresholding be less than or equal to each time slot switching arranged resources thresholding sum;
Be in system under the situation of moderate or heavy loads, some time slot of certain single file direction, when its time slot switching arranged resources thresholding has been finished using, increase the time slot handoff reservation resource thresholding of all the other time slots, make the time slot handoff reservation resource thresholding sum of these all the other time slots equal sub-district handoff reservation resource thresholding.
10. method according to claim 1, it is characterized in that described sub-district handoff reservation resource thresholding and time slot handoff reservation resource thresholding, it determines that method comprises: when carrying out the network planning or optimizing, according to different system load of estimating and the different service types of being supported, consider to comprise handover success rate, the cutting off rate of all kinds of business, the network performance index of call successful rate, make maximum, the minimum value of the uplink and downlink direction sub-district handoff reservation resource quantity of sub-district actual needs respectively; Determine sub-district handoff reservation resource thresholding and time slot handoff reservation resource thresholding according to this maximum, minimum value, make when system's actual motion, for the resource quantity of handoff reservation is subjected to the dual restriction of these two thresholdings and along with the variation of load is dynamically adjusted adaptively between the maximum of the handoff reservation resource quantity of needs and minimum value.
11. method according to claim 10, the maximum, the minimum value that it is characterized in that described uplink and downlink direction sub-district handoff reservation resource quantity according to the sub-district actual needs, determine sub-district handoff reservation resource thresholding and time slot handoff reservation resource thresholding, comprising: the actual handoff reservation resource quantity minimum value R of sub-district as required S_min=R SWith the sub-district of needs actual handoff reservation resource quantity maximum R S _ max = R S + &Sigma; i = 1 K R S &prime; - min { R S &prime; } , Obtain some groups of sub-district handoff reservation resource thresholding R SWith each time slot handoff reservation resource thresholding R S', time slot i=1 ... K, min{.} represent the function of minimizing; According to sub-district handoff reservation resource thresholding R SWhether less than each time slot handoff reservation resource thresholding R S' sum is judged some groups of thresholding R that obtained S, R S' whether reasonable, if R S < &Sigma; i = 1 K R S &prime; , It is reasonable then should to organize thresholding, otherwise it is unreasonable to organize thresholding.
12. method according to claim 10, the maximum, the minimum value that it is characterized in that described uplink and downlink direction sub-district handoff reservation resource quantity according to the sub-district actual needs, determine sub-district handoff reservation resource thresholding and time slot handoff reservation resource thresholding, comprising: the actual handoff reservation resource quantity minimum value of sub-district as required R S _ min = &Sigma; i = 1 K R S &prime; With the sub-district of needs actual handoff reservation resource quantity maximum R S _ max = R S + &Sigma; i = 1 K R S &prime; - min { R S &prime; } , Obtain some groups of sub-district handoff reservation resource thresholding R SWith each time slot handoff reservation resource thresholding R S', time slot i=1 ... K, min{.} represent the function of minimizing; According to sub-district handoff reservation resource thresholding R SWhether be not less than each time slot handoff reservation resource thresholding R S' sum judges whether respectively organize thresholding reasonable, when R S &GreaterEqual; &Sigma; i = 1 K R S &prime; The time, this group thresholding is reasonable, otherwise it is unreasonable to organize thresholding.
13., it is characterized in that: described each time slot handoff reservation resource thresholding R according to claim 11 and 12 described methods S', be all to reserve time interval resource by described time slot handoff reservation resource thresholding at all time slots, perhaps reserve time interval resource by described time slot handoff reservation resource thresholding at the part time slot; The time interval resource ratio of each time slot handoff reservation can be identical or different.
14. method according to claim 1 is characterized in that: described sub-district handoff reservation resource thresholding and time slot handoff reservation resource thresholding all comprise the reservation thresholding of power and code channel resource; The reservation thresholding of described code channel resource is expressed as the code channel number of reservation or is expressed as the preset code-channel number and the ratio of total code channel number; The reservation thresholding of described power resource is expressed as the ratio that power resource accounts for the gross power resource of reserving.
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CN1984465B (en) * 2006-04-21 2010-05-12 华为技术有限公司 Method and system for controlling switch process
CN101106805B (en) * 2006-07-11 2010-05-12 华为技术有限公司 Processing method and device for user terminal to enter into or exit from idle status
CN1984468B (en) * 2006-04-25 2010-09-08 华为技术有限公司 Method, system and control for re-configuring resources
CN101242642B (en) * 2007-02-08 2011-08-24 联想(北京)有限公司 Dynamic resource reservation permission control method and device for broadband wireless access system
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CN101321375B (en) * 2007-06-06 2012-12-19 华为技术有限公司 Method and server for controlling conversation switch
CN108495341A (en) * 2018-02-08 2018-09-04 西安电子科技大学 A kind of method for obligating resource and system, mobile communication system based on flow direction prediction
CN114257287A (en) * 2020-09-24 2022-03-29 大唐移动通信设备有限公司 Resource allocation method and equipment for satellite communication system

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CN1984468B (en) * 2006-04-25 2010-09-08 华为技术有限公司 Method, system and control for re-configuring resources
CN101106805B (en) * 2006-07-11 2010-05-12 华为技术有限公司 Processing method and device for user terminal to enter into or exit from idle status
CN101115298B (en) * 2006-07-27 2012-05-23 Lg电子株式会社 Mobile communication terminal, method of operating the same in handover rejection and method of rejecting handover in portable internet system
CN101242642B (en) * 2007-02-08 2011-08-24 联想(北京)有限公司 Dynamic resource reservation permission control method and device for broadband wireless access system
CN101321375B (en) * 2007-06-06 2012-12-19 华为技术有限公司 Method and server for controlling conversation switch
CN108495341A (en) * 2018-02-08 2018-09-04 西安电子科技大学 A kind of method for obligating resource and system, mobile communication system based on flow direction prediction
CN114257287A (en) * 2020-09-24 2022-03-29 大唐移动通信设备有限公司 Resource allocation method and equipment for satellite communication system
CN114257287B (en) * 2020-09-24 2023-02-17 大唐移动通信设备有限公司 Resource allocation method and equipment for satellite communication system

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