CN102665189A - Optimizing method for macro base station neighbor cell list based on femtocell double-layered network - Google Patents

Optimizing method for macro base station neighbor cell list based on femtocell double-layered network Download PDF

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Publication number
CN102665189A
CN102665189A CN2012101128516A CN201210112851A CN102665189A CN 102665189 A CN102665189 A CN 102665189A CN 2012101128516 A CN2012101128516 A CN 2012101128516A CN 201210112851 A CN201210112851 A CN 201210112851A CN 102665189 A CN102665189 A CN 102665189A
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China
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base station
macro base
pci
ncl
cell list
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CN2012101128516A
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李林燕
郑伟
李伟
巨颖
温向明
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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Priority to CN2012101128516A priority Critical patent/CN102665189A/en
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Abstract

The embodiment of the invention relates to an optimizing method for a macro base station neighbor cell list based on a femtocell double-layered network. According to the optimizing method, base stations of different types in the cell are differentially processed and the highest priority is provided for a CA (Closed Access) type family; and when the measuring frequency of a user terminal meets the conditions, immediately adding PCI (Physical Cell Identification) of the base station corresponding to the user terminal into the macro base station NCL (Neighbor Cell List) so as to ensure the service quality of the user. For the base stations of other types, after a macro base station timer reaches the time, calculating the priority of each PCI PCI in a unified way according to the reporting frequency of each PCI reported by the user during the time period and the user switching success rate counted for a long term; and sorting the PCIs according to the priority; and adding base station PCIs with high priority into the NCL until the length limitation of the NCL reaches.

Description

A kind of optimization method based on macro base station Neighboring Cell List under the femtocell double-layer network
Technical field
The present invention relates to the mobile communication technology field; Special; The present invention is used for providing a kind of under the situation of a large amount of Home eNodeB of future mobile communication system deployment, and the optimization method of macro base station Neighboring Cell List (NCL) can be used in Long Term Evolution of future generation (LTE) GSM.
Background technology
Show that according to investigation about 70% voice service and 90% data service occur in indoor.And indoor mobile communication business amount increases along with the improvement of communication technology evolution, business development and user's custom gradually.Moreover the user is increasingly high to the demand of data service speed, and the frequency range that next generation mobile communication system uses causes wireless signal loss aggravation through walls about 2GHz.Therefore only rely on the ability of traditional base station self can't satisfy the quality of service requirement that the overwhelming majority is in indoor user.In order to solve this difficult problem, a kind of technology that is called Home eNodeB is arisen at the historic moment.
Home eNodeB is a kind of small-power, plug and play, and the femto cell equipment by the user buys and installs mainly is used for for the user of indoor user and hot spot region the more data, services of high-quality being provided.The application of Home eNodeB has improved the spectrum reuse rate greatly, and to the highly significant that improves of power system capacity, application prospect is boundless.Therefore Home eNodeB certainly will be accepted extensively by people in the near future, and will be deployed among the macrocell in large quantities.
Neighboring Cell List is when the known base station dominant pilot, and the list of pilots of the relation of possibly switching with it of this base station is given in configuration.Pilot tone is distinguished with Physical Cell Identifier (PCI) in general.The user who is in mobile status possibly switch to another sub-district from current service cell, and the base station need be that the user sets up the time synchronized with target BS when disconnect user and this base station are got in touch.This just requires before switch this base station must know target BS PCI, otherwise will cause because of lacking user's service disruption of target P CI initiation.Therefore under the double-layer network of forming by macro base station and Home eNodeB,, switch smoothness and become our new challenge to guarantee the user how for the suitable NCL of macro base station configuration.
The access control mechanism of Home eNodeB has three kinds at present:
Sealing access module (CA): only allow the registered user to insert this Home eNodeB, user's group is by owner's decision of Home eNodeB.Such Home eNodeB is used for family more.
Open access module (OA); All are with inserting this Home eNodeB per family.Such Home eNodeB is used for enterprise and other hot spot regions more.
Mix access module (HA); Part resource supplies all users to use, and other resources only allow the registered user to use.
The document of research base station NCL self-configuring and self-optimizing has much at present, but they do not solve the macro base station NCL allocation problem when Home eNodeB is disposed in a large number.And the NCL length of stipulating in the standard now is shorter, can not satisfy a large amount of demands for services of disposing of Home eNodeB.
Fig. 1 is the scenes of Home eNodeB in a large amount of deployment of macrocell, comprises two macro base stations, ten Home eNodeB and 17 mobile subscribers.
Summary of the invention
The present invention is intended to be directed against existing NCL self-configuring and self-organization method can't solve the macro base station NCL allocation problem when disposing Home eNodeB in a large number in the macrocell; According to the difference of macro base station and Home eNodeB access style and transmitting power, a kind of comparatively effectively NCL optimization method is proposed.
In three kinds of access control patterns of Home eNodeB, the HA model study is less, and application prospect is uncertain, therefore puts aside.Consider that Home eNodeB is different with the type of macro base station; Therefore the wireless aware information of user's measurement is except the PCI field that comprises tested base station; Also should add a cell type field; Dissimilar sub-districts should be treated with a certain discrimination, can distinguish dissimilar sub-districts for making the user, in subscriber equipment, also the corresponding matched field should be set.In addition, their transmitted power has very big difference, and the activation threshold value of user's measurement report also should be different.Suppose the length long enough of base station NCL.
The present invention proposes a kind of macro base station NCL optimization method based on the different base station type:
Step 1. macro base station timer T starts, and prepares to receive the wireless messages of user terminal measurement;
The information of step 2. user terminal demodulate reception is judged base station type;
Step 3. is if base station type is CA, and then further whether the judges terminal has the identifier of Home eNodeB coupling therewith, if coupling then gets into step 4, otherwise returns step 2; If base station type is not CA, directly get into step 4.
Step 4. user terminal sends measurement report to macro base station, and the corresponding PCI counter of base station end adds 1;
Step 5. is then judged this counter at this moment whether greater than threshold value Nc if reporting the corresponding base station type of PCI is CA, if add among the NCL greater than then at once that this PCI is the corresponding Home eNodeB of threshold value, otherwise jumps to step 6;
Step 6. macro base station is checked the counter time, then jumps to step 7 if reach the triggered time, otherwise returns step 2:
The report number of times that step 7. obtained according to this time period and each PCI handover success rate of long-time statistical are calculated the priority of each PCI, and by descending;
Step 8. is upgraded NCL.
Explain:
In the step 2, when having only the base station radio signal strength signal intensity that receives when user terminal greater than certain threshold value, user terminal just carries out demodulation to it, and is also different for the setting of dissimilar this threshold values of base station.
In the step 3; If the base station type that obtains is CA; Then whether subscriber equipment inspection self has the sign that base station therewith is complementary, if do not explain then that this user is not the registered user of this CA Home eNodeB, need not send measurement report; This has saved the power of user terminal battery to a certain extent, and has improved the efficient of measuring.
In the step 5, the Home eNodeB of CA type need be treated with a certain discrimination.We think that CA user's priority is higher, as long as the report number of times reaches N c, then the base station joins Neighboring Cell List to guarantee the CA quality of services for users with this PCI at once.This step does not influence the statistics of macro base station to other types base station PCI.
In the step 7, time is up as if counter, and the base station system basis is the handover success rate and each PCI times of reporting of long-time statistical in the past, calculating priority level, and computing formula is:
p i = α × N i Σ j = 1 . . . K N j + ( 1 - α ) × R i
Wherein α is a weight factor, N iBe the measurement report number of times of this time period PCI i, K is total number of the PCI that reports, R iThe user who obtains for long-time statistical is the home base station cells success rate for switching of i to PCI from macro base station.
In the step 8, the PCI that priority is high preferentially adds NCL, reaches the length of agreement up to it.
Through accompanying drawing and specific embodiment technical scheme of the present invention is further specified below.
Description of drawings
In order more clearly to set forth embodiments of the invention and existing technical scheme; Below the explanation accompanying drawing of using in technical scheme explanation accompanying drawing of the present invention and the description of the Prior Art is done simple introduction; Obviously; Under the prerequisite of not paying creative work, those of ordinary skills can obtain other accompanying drawing through this accompanying drawing.
Fig. 1 is the system's scene graph that comprises macro base station, Home eNodeB and mobile subscriber in the embodiment of the invention.
Fig. 2 is that macro base station NCL optimizes flow chart in the embodiment of the invention.
Embodiment
Clearer for what technical scheme advantage of the present invention was described, do further to set forth in detail below in conjunction with the accompanying drawing specific embodiments of the invention, obvious described embodiment is part embodiment of the present invention, rather than whole embodiment.Can embodiments of the invention be expanded on this basis, under the situation of overall architecture unanimity, obtain more prioritization schemes.According to embodiments of the invention, those of ordinary skill in the art can realize every other embodiment of the present invention on without the basis of creative work, all belong to protection scope of the present invention.
Main thought of the present invention is: in the macrocell of disposing a large amount of Home eNodeB; Give macro base station through the variation of wireless signal around the macrocell subscriber terminal equipment perception measurement and with the measurement result information reporting; Macro base station obtains the type information and the PCI of reporting base station through the analysis report result.If the PCI type of receiving is CA, then when its report number of times reaches some requirements, at once its family is gone into to NCL; And for the base station of other types; After then waiting the timer triggered time to reach,, calculate the priority of each PCI according to the handover success rate of measuring number of times and long-time statistical; The PCI that priority is high preferentially adds NCL, reaches length restriction up to tabulation.
Shown in Figure 1 is at the macro base station NCL of a plurality of Home eNodeB of macrocell scope deployed configuration scene graph, only provides two macro base stations, ten Home eNodeB and 17 mobile subscribers' scene among the figure.
Fig. 2 is that embodiment of the invention macro base station NCL under the Home eNodeB deployment scenario more than optimizes flow chart, specifically describes as follows:
Step 201. macro base station timer T starts, and prepares to receive the wireless messages of user terminal measurement;
Setting the time that timer upgrades NCL as a whole, is the moment change for fear of macro base station NCL, and the stability of enhanced system reduces because the consumption that frequent updating NCL causes equipment.
The signal of step 202. user terminal demodulate reception is judged base station type;
The condition of restituted signal does, wireless signal strength is greater than some threshold values, and the threshold value of dissimilar base stations is provided with difference, and the signal threshold value of Home eNodeB is less than the threshold value of macro base station.
Step 203. is if base station type is CA, and then further whether the judges terminal has the identifier of Home eNodeB coupling therewith, if coupling then gets into step 204, otherwise returns step 202; If base station type is not CA, directly get into step 204.；
Have only the registered user of this CA Home eNodeB just to be necessary information to this base station of macro base station report; Other users are not because of inserting this Home eNodeB; Consider from the angle that improves measurement report efficient; Do not send the measurement report of this Home eNodeB, also reached the purpose of saving the user terminal energy consumption to macro base station.
Step 204. user terminal sends measurement report to macro base station, and the corresponding PCI counter of base station end adds 1;
Step 205. is then judged counter at this moment whether greater than threshold value Nc if reporting the corresponding base station type of PCI is CA, if add among the NCL greater than then at once that this PCI is the corresponding Home eNodeB of threshold value, otherwise jumps to step 206;
The report number of times that needs only CA type Home eNodeB PCI in this step reaches N c, then the base station joins Neighboring Cell List to guarantee the CA quality of services for users with this PCI at once.Do the high priority that has just embodied CA user like this, many users that pays should obtain better service.
Step 206. macro base station is checked the counter time, then jumps to step 207 if reach the triggered time, otherwise returns step 202:
The report number of times that step 207. obtained according to this time period and each PCI handover success rate of long-time statistical are calculated the priority of each PCI, and by descending;
In this step, time is up as if counter, the handover success rate of the former long-time statistical of base station system basis and the number of times of each PCI report, and calculating priority level, computing formula is:
p i = α × N i Σ j = 1 . . . K N j + ( 1 - α ) × R i
Wherein α is a weight factor, N iBe the measurement report number of times of this time period PCI i, K is total number of the PCI that reports, R iThe user who obtains for long-time statistical is the home base station cells success rate for switching of i to PCI from macro base station.
Step 208. is upgraded NCL.
The PCI that priority is high preferentially adds NCL, reaches the length of agreement up to it.

Claims (6)

1. optimization method based on macro base station Neighboring Cell List under the femtocell double-layer network is characterized in that may further comprise the steps:
Step 1. macro base station timer T starts, simultaneously the start signal receiving equipment;
The information that the demodulation of step 2. user terminal obtains is judged base station type;
Step 3. then needs further judges terminal whether the identifier of Home eNodeB coupling therewith arranged if base station type is CA, then gets into next step if having, otherwise report measurement information not returns step 2; If base station type is CA, directly get into next step;
Step 4. user terminal sends measurement report to macro base station, and the corresponding PCI counter of base station end adds 1;
Step 5. is if reporting the corresponding base station type of PCI is CA, and whether this counter of systems inspection this moment greater than Nc, if greater than then at once this PCI being added NCL, otherwise jumps to step 6;
Step 6. macro base station is checked the counter time, then jumps to step 7 if reach the triggered time; Otherwise return step 2:
Step 7. is calculated the priority of each PCI according to this time period report number of times of obtaining of system and each PCI handover success rate of long-time statistical, and by descending;
Step 8. is upgraded NCL.
2. the optimization method based on macro base station Neighboring Cell List under the femtocell double-layer network according to claim 1 is characterized in that:
In the said step 1, the frequent updating of NCL has been avoided in the application of the timer in this step, has reduced system load.
3. the optimization method based on macro base station Neighboring Cell List under the femtocell double-layer network according to claim 1 is characterized in that:
In said step 2 and the step 3, user terminal at once to the macro base station report, but checks whether the sign that is complementary with the base station type of surveying self is arranged after obtaining the information of base station, determine whether reporting this measurement result to macro base station.
4. the optimization method based on macro base station Neighboring Cell List under the femtocell double-layer network according to claim 1 is characterized in that:
In the said step 4, user terminal also should comprise a base station type field to the measurement report that macro base station sends except that comprising PCI information.
5. the optimization method based on macro base station Neighboring Cell List under the femtocell double-layer network according to claim 1 is characterized in that:
In said step 5 and the step 6; The user class of service of CA Home eNodeB is higher, thus need such Home eNodeB is treated with a certain discrimination, when the measurement report number of times reaches requirement; At once it is joined the NCL of macro base station, the unified calculation when base station of other types then waits the counter time to reach.
6. the optimization method based on macro base station Neighboring Cell List under the femtocell double-layer network according to claim 1 is characterized in that:
In the said step 7, the priority of each PCI is obtained by report number of times and handover success rate COMPREHENSIVE CALCULATING, and each factor has corresponding with it weights.
CN2012101128516A 2012-04-13 2012-04-13 Optimizing method for macro base station neighbor cell list based on femtocell double-layered network Pending CN102665189A (en)

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CN109300218A (en) * 2018-10-18 2019-02-01 南京奥拓电子科技有限公司 A kind of queuing machine management system and method for the auto arrangement number of taking work flow
CN109963310A (en) * 2017-12-14 2019-07-02 中国移动通信集团吉林有限公司 A kind of different-system switching method and device
CN111050352A (en) * 2019-12-27 2020-04-21 京信通信系统（中国）有限公司 Terminal mobility interoperation method and network equipment

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN109963310A (en) * 2017-12-14 2019-07-02 中国移动通信集团吉林有限公司 A kind of different-system switching method and device
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Application publication date: 20120912