CN1434595A - Method for automatic maintenance neighborlist in CDMA system - Google Patents
Method for automatic maintenance neighborlist in CDMA system Download PDFInfo
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Abstract
This invention puts forward an automatic maitaining neighborlist method in CDMA system in which, switching is an important method for guaranteeing normal talk between local area, yet, the successful switch is to configurate correct heighborlist information at the network side, actually, base station distribution information by network planning and the neighborlist got frame actual path test are not very accurate. This invented method will get the lost matched heighbor in network plan and add the local information not listed in the list reported by mobile station to the neightborlist after filtering and matching the unlisted areas.
Description
Technical field
The present invention relates to the cdma cellular mobile communication system, relate in particular to the method for automatic maintenance neighborlist information when carrying out handover measurement in the cdma system.
Background technology
In existing C DMA (code division multiple access) cell mobile communication systems, the radio-frequency power of base station is confined within certain scope (sub-district).Enter the another one sub-district when travelling carriage leaves a sub-district, the signal of the original sub-district that this travelling carriage is received inevitable more and more a little less than, and its received signal that enters the sub-district will be more and more stronger just also.In order to keep the communication quality of travelling carriage, must switch to the stronger base station of signal that newly enters by original base station to continuing of this travelling carriage, the notion of switching in Here it is the cell mobile communication systems.
The strategy that switches in the cdma cellular mobile communication system has strategies such as network control switching, Mobile Assisted Handover, travelling carriage control switching, the strategy that initial cell mobile communication systems generally adopts network control to switch.And the system that upgrades, as GSM, IS-95 system etc. all adopts the strategy of Mobile Assisted Handover.In the 3G-WCDMA system, also adopt the strategy of Mobile Assisted Handover.
In the strategy of Mobile Assisted Handover, travelling carriage and base station are measured the quality (as RSSI, SIR or BER etc.) of forward direction and backward channel respectively, and respectively measurement result are reported network, and network based measurement result is carried out switch decision.Therefore, in the strategy of Mobile Assisted Handover, travelling carriage needs constantly to measure the quality of current sub-district of living in and adjacent cell forward channel.And which adjacent cell measurement travelling carriage will be to control defined by the measurement that network side issues to, measures the adjacent area list information defined when the network optimization in the control.
Network optimization allocating cell Neighboring Cell List adopts two kinds of methods to be used in combination, as shown in Figure 1.At first determine the adjacent area of sub-district, use the method for drive test to verify whether dispose rationally simultaneously according to base station distributed intelligence geographically.In Fig. 1,5 sub-districts are arranged, if the residing current area of travelling carriage is sub-district 5, according to base station distribution situation geographically, when network optimization allocating cell Neighboring Cell List, sub-district 1 and sub-district 3 are classified as the adjacent area of current area 5, sub-district 4 is not classified as the adjacent area of current area 5.During drive test, when road measuring device 6 moves in the sub-district 5 information that does not have adjacent area 3 in the neighboring BS information of finding sub-district, place 5, but the signal that measuring equipment and special-purpose software by special use can receive sub-district 3 again illustrates that then original configuration is wrong, be adjusted.But this method needs special-purpose measuring equipment and analysis software, and to measure its workload to all sub-districts be sizable, and still can not guarantee comprehensively.In real network, often there are situations such as miss-configured neighboring cells, area covered, cause island effect.When initiating to switch, travelling carriage just is easy to failure in this sub-district.
Summary of the invention
The objective of the invention is to propose the method for automatic maintenance neighborlist in a kind of cdma system, make cdma system put into operation after maintenance neighborlist information dynamically still, the sub-district that leakage is joined is appended in the Neighboring Cell List to be gone, to remedy the deficiency of the network optimization.Both can reduce network optimization personnel's workload, and can improve the accuracy of adjacent area list information again.
The method of automatic maintenance neighborlist in a kind of cdma system, described method is achieved in that
Network side sending measuring control messages has comprised cell list information to travelling carriage in the described measurement control messages, and cell list information is used to indicate travelling carriage to measure which sub-district.Wherein, cell list is made of residing sub-district of travelling carriage and adjacent area thereof, and Neighboring Cell List disposes when the network planning, because leakage is joined, the adjacent cell that causes having is not in Neighboring Cell List probably.
After travelling carriage is received the measurement control messages that network side issues, the measurement report of the sub-district of in the tabulation of network side reporting neighboring cell, setting.The sub-district that does not have in the cell neighbor list, then travelling carriage can not report its metrical information.Therefore, measure in the control signaling corresponding condition need be set, allow sub-district unlisted in the cell list to trigger certain incident, after events corresponding was triggered, travelling carriage will report the measurement result and the relevant information of unlisted sub-district.
In certain hour, network side is by to after the statistics of measurement report, the ordering, with occur in the measurement report and in Neighboring Cell List unlisted sub-district be decided to be suspicious sub-district, just suspect the adjacent cell of being omitted when these sub-districts are the network planning.But when the network planning, the sub-district that has is not to be added into intentionally in the neighbor cell list of current area to go really.At this situation, need deposit a mapping table at network side, wherein that the adjacent area of each sub-district and this sub-district that some are planned intentionally is not corresponding.Like this, suspicious sub-district is mated in mapping table,, remaining suspicious sub-district is done further checking again if be to have a mind to then these suspicious cell filterings be fallen the not adjacent area of planning really.
In measurement report, the information of suspicious sub-district comprises their local identities information, but does not comprise sub-district overall identification information.In the WCDMA system, be used as sub-district local identities information with main scrambler exactly, be used as sub-district overall identification information with sub-district ID.Because local identities information is used for local distinguishing cell, sub-district global identifier information is only the information of unique identification cell identity in whole network, so network side will match a plurality of sub-districts overall situation indications according to the local identifier of certain suspicious sub-district, promptly match a plurality of suspicious sub-districts.
After network side obtains these suspicious sub-districts, will judge whether these sub-districts are in the position, adjacent area of current area by geographical location information.Utilize geographical location information as basis for estimation, need deposit the latitude and longitude coordinates and the radius of society information of center of housing estate at network side.Wherein, radius of society information is when the network planning, is disposed by network planning personnel.
Described network side calculates the centre distance of residing current area of described travelling carriage and described suspicious sub-district and is multiplied by penalty coefficient, compares with the radius sum of residing current area of travelling carriage and suspicious sub-district again, if satisfy formula:
α C
kC
j<(R
k+ R
j) then described suspicious sub-district is in the position, adjacent area of current area geographically, if do not satisfy above-mentioned formula, then described suspicious sub-district is not in the position, adjacent area of current area geographically; Wherein, α is a penalty coefficient, and α is greater than 1;
C
kC
jCentre distance for current area k and suspicious sub-district j;
R
kIt is the radius of current area k;
R
jIt is the radius of suspicious sub-district j.
The suspicious sub-district of not satisfying formula will be not processed, network side continues to judge whether the suspicious sub-district of satisfying formula is in the center of the control area of base station controller, if then network side adds suspicious sub-district in the Neighboring Cell List of the residing current area of travelling carriage to automatically; If not, the subordinate sub-district that may be another base station controller, this suspicious sub-district then, for current area is an interfered cell, need further confirm suspicious sub-district by network optimization personnel, this suspicious sub-district not added in the Neighboring Cell List of the residing current area of travelling carriage.
Remarkable result of the present invention is: adopt cell mobile communication systems of the present invention can significantly reduce network optimization personnel's workload, reduce the expense that Neighboring Cell List is safeguarded.After putting into operation, cdma system utilize domestic consumer to replace the planning personnel, utilize general mobile platform to replace special measurement equipment, maintenance neighborlist information automatically, the sub-district that leakage is joined is appended in the Neighboring Cell List to be gone, to remedy the deficiency of the network optimization, improve the accuracy of adjacent area list information.Thereby effectively guarantee success rate for switching, improve systematic function.
Description of drawings
Fig. 1: road measuring method allocating cell Neighboring Cell List
The geographical position figure of the suspicious sub-district of Fig. 2: embodiment
Fig. 3: the current area 1 among the embodiment is positioned at the base station controller center
Fig. 4: the current area 1 among the embodiment is positioned at the base station controller marginal position
Fig. 5: the cell neighbor list among the embodiment is safeguarded flow chart
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
The cell neighbor list that is illustrated in figure 5 as present embodiment is safeguarded flow chart, after travelling carriage is received the measurement control messages that network side issues, reports the measurement report of the reporting cell of setting to network side.Comprised cell list information in the described measurement control messages, cell list information is used to indicate travelling carriage to measure which sub-district.Wherein, cell list is made of residing sub-district of travelling carriage and adjacent area thereof, and Neighboring Cell List disposes when the network planning, probably has to leak the adjacent cell of joining.The corresponding conditions that is provided with in measurement that network side the issues control signaling makes sub-district unlisted in the cell neighbor list trigger certain incident, after events corresponding is triggered, travelling carriage will the reporting neighboring cell tabulation in the measurement result and the relevant information of unlisted sub-district.For example, in the WCDMA system, in common frequency measurement control signaling, the reporting standards of incident 1A and 1E is set, and the reporting cell that travelling carriage is set is active set cell and unlisted collection sub-district.Active set is the set that the travelling carriage sub-district of communicating by letter is formed.And monitoring that collection is to enter the set that the sub-district of travelling carriage active set is formed, they are by with monitoring that frequently collection, alien frequencies monitor constituting of collection, different system monitoring collection or they.Unlisted collection is active set and the set that monitors the adjacent cell that does not relate in the collection.When travelling carriage has satisfied the trigger condition of 1A or 1E incident by measuring certain unlisted collection sub-district of discovery, will on network side, send out measurement report, in report, comprise the measured value of this sub-district, the synchronizing information of sub-district, relevant informations such as the main scrambler of sub-district etc.
In certain hour, network side is by to after the statistics of measurement report, the ordering, with occur in the measurement report and in the Neighboring Cell List of current area 1 unlisted sub-district be decided to be suspicious sub-district, just suspect the adjacent cell of being omitted when these sub-districts are the network planning.But when the network planning, the sub-district that has is not to be added into intentionally in the neighbor cell list of current area to go really.Therefore deposited a mapping table at network side, wherein that the adjacent area of each sub-district and this sub-district that some are planned intentionally is not corresponding.Suspicious sub-district is mated with the not planning sub-district of current area 1 in mapping table one by one,, then these suspicious sub-districts are filtered out one by one if having a mind to the not adjacent area of planning.After filtering out the suspicious sub-district of not planning intentionally, judge whether all suspicious sub-districts all have been filtered,, then remaining suspicious sub-district is done further checking again if also have remaining suspicious sub-district; If all filtered out, then turn back to the beginning step, network side is the measurement report that reports of receiving mobile once more.
The information of the suspicious sub-district in the measurement report comprises their local identities information, but does not comprise sub-district overall identification information.For example in the WCDMA system, be used as sub-district local identities information with main scrambler exactly, be used as sub-district overall identification information with sub-district ID.Because local identities information is used for local distinguishing cell, sub-district global identifier information is only the information of unique identification cell identity in whole network, so, network side will match a plurality of sub-districts overall situation indications according to the local identifier of suspicious sub-district, in the present embodiment, the suspicious sub-district that matches is sub-district 2 and sub-district 3.
As shown in Figure 2, behind the suspicious sub-district 2 and 3 that network side obtains determining, will judge whether sub-district 2 and sub-district 3 are in the position, adjacent area of current area 1 by geographical location information.By the geographical location information that network side is deposited, determine the center of housing estate latitude and longitude coordinates of current area 1 and sub-district 2,3, also determine that radius of society is R
1, R
2, R
3, be C by the air line distance that calculates sub-district 1 and sub-district 2
1C
2, air line distance and C between sub-district 1 and the sub-district 3
1C
3
Described network side calculates the centre distance of residing current area of described travelling carriage and described suspicious sub-district and is multiplied by penalty coefficient, compares with the radius sum of residing current area of travelling carriage and suspicious sub-district again, if satisfy formula:
α C
kC
j<(R
k+ R
j) then described suspicious sub-district is in the position, adjacent area of current area geographically, if do not satisfy above-mentioned formula, then described suspicious sub-district is not in the position, adjacent area of current area geographically; Wherein, α is a penalty coefficient, and α is greater than 1;
C
kC
jCentre distance for current area k and suspicious sub-district j;
R
kIt is the radius of current area k;
R
jIt is the radius of suspicious sub-district j.
Through judging, wherein the distance between sub-district 1 and the sub-district 3 is greater than the radius of society sum of sub-district 1 and sub-district 3: α C
1C
3>(R
1+ R
3), and the distance between sub-district 1 and the sub-district 2 is less than the sub-district 1 radius of society sum with sub-district 2: α C
1C
2<(R
1+ R
2).This shows that sub-district 3 can not be the adjacent area of sub-district 1, and the not planning adjacent area of sub-district 1 just, sub-district 2.
Network side continues to judge whether the suspicious sub-district of satisfying formula is in the center of the control area of base station controller, if, as shown in Figure 3, current area 1 is in the center of the control area 31 of base station controller, and then network side adds suspicious sub-district 2 in the Neighboring Cell List of the residing current area 1 of travelling carriage to automatically; If not, as shown in Figure 4, current area 1 is in the marginal position of the control area 41 of base station controller, the subordinate sub-district of the control area 42 that may be another base station controller, this suspicious sub-district 2 then, for current area 1 is an interfered cell, this suspicious sub-district 2 is not added in the Neighboring Cell List of the residing current area 1 of travelling carriage, need further confirm suspicious sub-district 2 by network optimization personnel.
Claims (7)
1, the method for automatic maintenance neighborlist in a kind of cdma system is characterized in that, said method comprising the steps of:
The measurement report that step a, network side report by travelling carriage obtains suspicious cell information;
Step b, judge by the sub-district geographical location information of network side whether described suspicious sub-district is in the position, adjacent area of the residing current area of travelling carriage, if not, step c then entered; If then enter steps d;
Step c, described suspicious sub-district are not processed, enter step g;
Steps d, judge whether current area is in the center of base station controller, if not, step e entered; If then enter step f;
Step e, suspicious sub-district is not added in the Neighboring Cell List of the residing current area of travelling carriage, enter step g;
Step f, described network side add described suspicious sub-district in the Neighboring Cell List of the residing current area of travelling carriage to automatically;
Step g, return step a.
2, the method for automatic maintenance neighborlist in a kind of cdma system as claimed in claim 1, it is further characterized in that step a is further comprising the steps of:
The measurement report that step 1, described network side receiving mobile report;
After step 2, described network side are added up, are sorted measurement result, with occur in the described measurement report and in Neighboring Cell List unlisted sub-district be decided to be suspicious sub-district;
Step 3, described network side mate described suspicious sub-district according to mapping table, and the suspicious cell filtering that mates is fallen, and remaining suspicious sub-district is further mated;
Step 4, according to the local identities information of described remaining suspicious sub-district, mate corresponding sub-district overall identification information, the suspicious sub-district that obtains determining.
3, the method for automatic maintenance neighborlist in a kind of cdma system as claimed in claim 2, it is further characterized in that, occur in the measurement report described in the step 2 and the sub-district of joining or not disposing intentionally for each cell configuration adjacent area hourglass when unlisted sub-district is the network optimization in the described Neighboring Cell List.
4, the method for automatic maintenance neighborlist in a kind of cdma system as claimed in claim 2, it is further characterized in that, make the method that writes down cell information unlisted in the Neighboring Cell List in the described measurement report be in the step 2: by in the measurement control signaling of sending at network side corresponding condition being set, described corresponding conditions requires travelling carriage to allow unlisted sub-district to trigger the event report of regulation, after described event report is triggered, will write down the measurement result and the relevant information of unlisted sub-district in the measurement report that travelling carriage reports.
5, the method for automatic maintenance neighborlist in a kind of cdma system as claimed in claim 2, it is further characterized in that the mapping table in the step 3 leaves network side in, comprising each sub-district and intentionally do not plan adjacent area corresponding with it.
6, the method for automatic maintenance neighborlist in a kind of cdma system as claimed in claim 1, it is further characterized in that, among the step b, judges that the method whether suspicious sub-district is in the position, adjacent area of current area is:
Described network side storing has the latitude and longitude coordinates of each center of housing estate and the radius of each sub-district, described network side calculates the centre distance of residing current area of described travelling carriage and described suspicious sub-district and is multiplied by penalty coefficient, compare with the radius sum of residing current area of travelling carriage and suspicious sub-district again, if satisfy formula:
α C
kC
j<(R
k+ R
j) then described suspicious sub-district is in the position, adjacent area of current area geographically, if do not satisfy above-mentioned formula, then described suspicious sub-district is not in the position, adjacent area of current area geographically; Wherein, α is a penalty coefficient, and α is greater than 1;
C
kC
jCentre distance for current area k and suspicious sub-district j;
R
kIt is the radius of current area k;
R
jIt is the radius of suspicious sub-district j.
7, the method for maintenance neighborlist in a kind of cdma system as claimed in claim 6, it is further characterized in that the value of penalty coefficient α is between 1.0 to 2.5.
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