CN1984459A - Switch for discriminating missing adjacent domain - Google Patents
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- CN1984459A CN1984459A CNA2006100723311A CN200610072331A CN1984459A CN 1984459 A CN1984459 A CN 1984459A CN A2006100723311 A CNA2006100723311 A CN A2006100723311A CN 200610072331 A CN200610072331 A CN 200610072331A CN 1984459 A CN1984459 A CN 1984459A
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Abstract
The method comprises: a) according to local ID of each cell carried in the measurement report reported from mobile station, the network side identifies the global ID of each cell, and according to the identified global ID, decides if there is a neighboring cell missing the match; if yes, then entering step b; otherwise, entering step c; b) according to local ID of each neighboring cell missing the match and the cell parameter database, identifies the global ID of each neighboring cell missing the match; for the neighboring cell missing the match, which is identified out its global ID, and the cell in step a, executes the next switch process; c) for the cell which is identified its global ID, executes the next switch process.
Description
Technical field
The present invention relates to handoff technique, refer to a kind of changing method of discerning miss-configured neighboring cells especially.
Background technology
In existing code division multiple access (CDMA) cell mobile communication systems, because the transmitting power of base station is confined within certain scope, therefore when travelling carriage leaves a sub-district and enters the another one sub-district, the received former cell signal of this travelling carriage certainly will be more and more a little less than and the signal that enters the sub-district that receives can be more and more stronger.In order to keep the communication quality of travelling carriage, the connection of this travelling carriage must be switched to the stronger base station of signal that newly enters by original base station, the notion of switching in Here it is the cell mobile communication systems.
In the strategy of the Mobile Assisted Handover of cdma cellular mobile communication system, travelling carriage needs constantly to measure the forward channel quality of current sub-district of living in and adjacent cell; And measurement result is reported network side by special measurement report message, the measurement result that network side reports according to travelling carriage is carried out switch decision and carry out to be switched, and is specially: situation enforcements of the judgment such as the signal strength signal intensity of sub-district and load thereof are switched or are abandoned switching in the measurement report that network side reports according to travelling carriage; If the network enforcement of the judgment is switched, will send to travelling carriage and switch execution command, the content update Active Set that travelling carriage executes instruction according to switching, and then finish whole handoff procedure.
When switch decision is carried out in the sub-district that travelling carriage is reported, network side also needs a very important information, it is the overall identification of sub-district, when the measurement report that reports according to travelling carriage when network side can't identify the overall identification of sub-district, network side then can not carry out switch decision to this sub-district, and promptly this sub-district can not participate in the switching of travelling carriage.Here, the overall identification of sub-district is the local identities that network side carries in measurement report according to travelling carriage, mates to obtain in Serving cell tabulation of the current mobile station place of network side self storage and neighbor cell list.
The overall identification of sub-district is sub-district unique identify label in whole network; And the local identities of sub-district just is used for local distinguishing cell, can not represent the real identity of sub-district.In the measurement report of cdma system, use pilot offset (PN Offset) or pilot phase (PN Phase) to come sub-district of local identities usually.If network side can not obtain corresponding overall identification according to the local identities coupling in tabulation of the Serving cell of travelling carriage and neighbor cell list, then network side just can not identify the overall identification of this local identities respective cell, accordingly, this sub-district also just can not participate in the sub-district switching of travelling carriage.
Here, the Serving cell tabulation of travelling carriage and neighbor cell list are by the network side configuration and be stored in network side, in the Serving cell tabulation, write down the corresponding relation of the local identities and the overall identification of Serving cell at least, in neighbor cell list, write down the corresponding relation of the local identities and the overall identification of neighbor cell at least.Described neighbor cell is the sub-district that has neighboring BS relationship with the travelling carriage Serving cell, and the sub-district that has neighboring BS relationship with Serving cell is to obtain according to the neighboring BS relationship of putting in order each sub-district of writing down in the net cell parameter database.Because may there be a plurality of Serving cells in travelling carriage, therefore in neighbor cell list, record be the neighbor cell of each Serving cell of travelling carriage.
What wherein, write down in the whole net cell parameter database is: the cell information of each sub-district and neighboring BS information in the network.Cell information comprises: the information relevant with cell attribute of the local identities of sub-district, overall identification and geographical location information; Neighboring BS relationship then is the sub-district that has neighbouring relations with the sub-district of record.The mode that obtains the sub-district neighbouring relations is: according to topology of networks, sub-district adjacent on the geography, be configured to neighbor cell in database; Perhaps,, be configured to neighbor cell those sub-districts that overlapping area of coverage is arranged according to the method for drive test.
In this article, claim that the Serving cell tabulation and the neighbor cell list of travelling carriage are the cell list of travelling carriage.Along with travelling carriage constantly moves, network side is that the cell list of travelling carriage setting also can constantly change.
The neighboring BS relationship of configuration network, be neighbor cell list of each cell maintenance in the network, be a very large order, network side at first needs to determine according to base station distributed intelligence geographically the initial adjacent area of sub-district, uses the method for drive test to verify whether dispose rationally simultaneously; In addition, can also further optimize neighbor cell configuration work from the measurement data that travelling carriage collects according to network side.Since the complexity of network wireless environment, and the restriction of neighbor cell number size, the feasible situation that miss-configured neighboring cells often occur existing.Miss-configured neighboring cells are: occur in travelling carriage reports the measurement report of network side, but be not recorded in sub-district in the cell list that network side is the travelling carriage configuration.
When travelling carriage from a sub-district when move another sub-district, and the sub-district that current mobile station to be ready entering just network side and be not configured in the current cell list of travelling carriage for various reasons.Because network side all can not successfully match overall identification according to the sub-district local identities that travelling carriage reports in the cell list of self storing, and cause network side can not set up the communication link of this sub-district for travelling carriage, therefore cause handoff failure, the final call drop that causes, had a strong impact on quality of services for users, the communication quality of travelling carriage is descended.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of changing method of discerning miss-configured neighboring cells, uses this method and can discern miss-configured neighboring cells in the process that switch the sub-district, and make miss-configured neighboring cells can participate in the handoff procedure of sub-district, improve handover success rate, prevent call drop.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of changing method of discerning miss-configured neighboring cells, this method may further comprise the steps:
The local identities of each sub-district of carrying in the measurement result that A, network side report according to travelling carriage is discerned the overall identification of each sub-district, and judges whether to exist miss-configured neighboring cells according to the result of identification overall identification, if exist, and execution in step B then; Otherwise, execution in step C;
B, according to the local identities and the whole net cell parameter database of each miss-configured neighboring cells, discern the overall identification of each miss-configured neighboring cells; Follow-up switching flow is carried out in the sub-district of identifying overall identification in the miss-configured neighboring cells of identifying overall identification and the steps A, finish current handling process;
C, follow-up switching flow is carried out in the sub-district of identifying overall identification.
Wherein, in the steps A, described result according to the identification overall identification judges whether to exist miss-configured neighboring cells to be: the overall identification of searching each sub-district of travelling carriage current area tabulation identification according to the local identities of each sub-district, judge whether also to exist the sub-district that does not have identified overall identification, if exist, then execution in step B; Otherwise, execution in step C.
Wherein, among the step B, described local identities and whole net cell parameter database according to miss-configured neighboring cells, the overall identification of identification miss-configured neighboring cells is:
B1, in whole net cell parameter database, search the sub-district identical, set up the doubtful cell list of miss-configured neighboring cells with the miss-configured neighboring cells local identities;
The geographical location information of each doubtful sub-district in B2, the doubtful cell list of acquisition, and, determine it is the doubtful sub-district of miss-configured neighboring cells according to the geographical location information of each doubtful sub-district and the geographical location information of travelling carriage contrast Serving cell;
B3, basis are the doubtful sub-districts of miss-configured neighboring cells, obtain the overall identification of miss-configured neighboring cells.
Wherein, set in advance distance threshold, described geographical location information is a latitude and longitude information;
Among the step B2, described according to the geographical location information of each doubtful sub-district and the geographical location information of travelling carriage contrast Serving cell, determine that the doubtful sub-district of miss-configured neighboring cells is:
B21, obtain the latitude and longitude information of each doubtful sub-district, and the latitude and longitude information of each doubtful sub-district subtracted each other with the latitude and longitude information of contrast Serving cell obtain difference;
B22, judge each the doubtful sub-district calculate and contrast Serving cell the latitude and longitude information difference whether all greater than distance threshold, if, then can't be defined as the doubtful sub-district of current miss-configured neighboring cells, finish current handling process; Otherwise, execution in step B23;
Whether B23, judgement have only one less than the latitude and longitude information difference of distance threshold, if determine that then the pairing doubtful sub-district of current latitude and longitude information difference less than distance threshold is current miss-configured neighboring cells; Otherwise, execution in step B24;
B24, each difference is compared less than each doubtful sub-district of distance threshold latitude and longitude information difference with the contrast Serving cell, obtain minimum latitude and longitude information difference, determine that then the doubtful sub-district of minimum latitude and longitude information difference correspondence is current miss-configured neighboring cells.
Wherein, when there was more than one Serving cell in travelling carriage, described contrast Serving cell was: Serving cell that signal quality is best or reference cell;
When only there was a Serving cell in travelling carriage, described contrast Serving cell was: the travelling carriage current service cell.
In addition, restriction switching cell tabulation is set, among the step B, the sub-district of identifying overall identification in the miss-configured neighboring cells of identifying overall identification and the steps A is carried out before the follow-up switching flow, further comprise at each sub-district:
Judge that travelling carriage contrast Serving cell is whether in the restriction switching cell tabulation of miss-configured neighboring cells, if then refuse these miss-configured neighboring cells and participate in follow-up switching flow.
Wherein, when there was more than one Serving cell in travelling carriage, described contrast Serving cell was: Serving cell that signal quality is best or reference cell;
When only there was a Serving cell in travelling carriage, described contrast Serving cell was: the travelling carriage current service cell.
Wherein, described whole net cell parameter database is: write down the local identities of each sub-district and the database of overall identification corresponding relation in the network at least.
In addition, this method further comprised before steps A: network side is provided with the identification range of each local identities;
Steps A comprises: the identification range of the local identities measurement result that network side reports described travelling carriage and each local identities of network side setting mates, with the local identities of each sub-district of carrying in the identification measurement result.
Wherein, described sub-district is: by base station section or the definite sub-district of base station section carrier frequency.
A kind of changing method of discerning miss-configured neighboring cells provided by the present invention by finishing the identification to miss-configured neighboring cells at the handoff procedure of sub-district, and then makes miss-configured neighboring cells can participate in the handoff procedure of sub-district equally.By using method provided by the present invention, even exist under the network environment of miss-configured neighboring cells, also can discern miss-configured neighboring cells automatically, and make miss-configured neighboring cells participate in switching directly, improved success rate for switching, reduce the call drop probability in the handoff procedure, improved the communication quality of quality of services for users and travelling carriage.
Description of drawings
Fig. 1 is the flow chart of identification miss-configured neighboring cells changing method among the present invention;
Fig. 2 is the flow chart of identification miss-configured neighboring cells among the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
The flow chart of present embodiment may further comprise the steps as shown in Figure 1:
Step 101: travelling carriage carries out periodic measurement to the Serving cell at self place and the neighbor cell adjacent with Serving cell, and measurement result is reported network side under the control of network side.Wherein, carried the local identities of each sub-district that moving table measuring obtains in the measurement result.
Step 102: network side is searched the current cell list of travelling carriage according to the local identities of each sub-district of carrying in the measurement result, according to local identities the overall identification of each sub-district is discerned.After cell identification is finished, judge whether to exist miss-configured neighboring cells according to the situation of cell identification, if exist, then execution in step 103; Otherwise, execution in step 105.
Here, because the factor of network environment, according to reporting of mobile station measurements, network side may be found to have one or more miss-configured neighboring cells in the current cell list of travelling carriage.
Situation according to cell identification judges whether to exist miss-configured neighboring cells to be specially: judge according to local identities identification overall identification whether also have the sub-district that does not have identified overall identification, if there is the sub-district that does not have identified overall identification, then there are miss-configured neighboring cells in the cell list of current mobile station, execution in step 103; If there is no do not have identified sub-district, promptly all sub-districts carry out can both identifying corresponding overall identification after the cell identification, then do not have miss-configured neighboring cells in the cell list of current mobile station, execution in step 105.
The local identities of in cdma system, representing the sub-district usually with pilot offset or pilot phase, usually pilot phase distortion can occur through after the transmission of wireless channel, therefore just needs are provided with distortion factor according to the concrete condition of network environment in advance, are used for adjusting the identification of network to the sub-district local identities.For example, when pilot phase be 6400, when distortion factor is 64, network side then is provided with pilot phase in 6336 to 6464 scopes, equal corresponding pilot phase 6400.Here, claim the scope of local identities X-distortion factor A to X+A to be: the identification range of local identities X.Local identities within local identities X identification range determines that all this local identities is X.In order to realize this process, need network side in advance each local identities to be provided with the local identities identification range, after network side receives the local identities measurement result that travelling carriage reports, then the identification range with each local identities of network side setting mates, with the local identities of each sub-district of carrying in the identification measurement result.
Step 103:, discern the overall identification of each miss-configured neighboring cells according to the local identities and the whole net cell parameter database of each miss-configured neighboring cells.
At this, the detailed process of discerning the overall identification of miss-configured neighboring cells according to the local identities of miss-configured neighboring cells can be referring to Fig. 2.
Step 104:, carry out follow-up switching flow according to the measurement result that travelling carriage reports to identifying the sub-district of overall identification in the miss-configured neighboring cells of identifying overall identification and the step 102.Finish current handling process.
When step 103 enters execution in step 104, then show in the measurement result network side discovery current area tabulation that reports according to current mobile station and have miss-configured neighboring cells, and in step 103, miss-configured neighboring cells are carried out the identification of overall identification, then be that follow-up switching flow is carried out in the miss-configured neighboring cells of identifying overall identification in step 103 and the sub-district of identifying overall identification in step 102 in step 104, here, and be not included in the miss-configured neighboring cells that do not have identified overall identification in the step 103.
Step 105:, carry out follow-up switching flow according to the measurement result that travelling carriage reports to identifying the sub-district of overall identification.Here, the follow-up switching flow of described execution is: according to the measurement result that travelling carriage reports, carry out switch decision, and the follow-up flow process that increases or delete link according to the result of switch decision.
In step 105, when when step 102 enters execution in step 105, show in the cell list of current mobile station not have miss-configured neighboring cells that the measurement result that network side then reports according to travelling carriage is carried out follow-up switching flow to the sub-district of identifying overall identification.
In order to realize discerning the process of miss-configured neighboring cells overall identification, need network side to set in advance distance threshold.Distance threshold specifically be provided with can for: the network parameters such as pilot offset multiplex distance that are provided with during according to the coverage of each sub-district or the network planning are provided with.
Fig. 2 is for carrying out the process of overall identification identification, specifically as shown in Figure 2 to miss-configured neighboring cells.
Step 201: network side is searched in whole net cell parameter database according to the local identities of miss-configured neighboring cells, search the sub-district that has same local identities with miss-configured neighboring cells, here title is doubtful sub-district with the sub-district that miss-configured neighboring cells have same local identities, then according to searching the doubtful cell list that current miss-configured neighboring cells are set up in the doubtful sub-district that obtains.Here, doubtful cell list is: write down a plurality of doubtful sub-districts identical with the miss-configured neighboring cells local identities.
Consider that current miss-configured neighboring cells can't discern in travelling carriage current area tabulation, can not discern but do not represent in the neighbouring relations of every other sub-district, therefore according to the local identities of miss-configured neighboring cells, foundation may be the tabulation of the doubtful sub-district of miss-configured neighboring cells, then, in follow-up step,, be defined as the doubtful sub-district of miss-configured neighboring cells again according to doubtful cell list.
Because, be used in cdma system representing that the pilot offset of sub-district local identities can be multiplexing, therefore from whole network, a pilot offset may be used for representing local identities by a plurality of sub-districts; And then, search in whole net cell parameter database according to the local identities of miss-configured neighboring cells in this step, just might find a plurality of doubtful sub-districts identical with the miss-configured neighboring cells local identities, therefore, just there has been the doubtful cell list described in the step 201.
Step 202: obtain the geographical location information of each doubtful sub-district in the doubtful cell list and the geographical location information of contrast Serving cell.
Wherein the geographical location information of the geographical location information of each doubtful sub-district and contrast Serving cell can obtain according to the geographical location information of each sub-district of network side storing in the prior art, such as whole net cell parameter database.
Contrast Serving cell described here is: when there was more than one Serving cell in travelling carriage, described contrast Serving cell was: Serving cell that signal quality is best or reference cell; When only there was a Serving cell in travelling carriage, described contrast Serving cell was: the travelling carriage current service cell.
Step 203: calculate each doubtful sub-district and UE the contrast Serving cell latitude and longitude information between the latitude and longitude information difference.
Step 204: judge that the doubtful sub-district and the UE that respectively calculate contrast the latitude and longitude information difference of Serving cell whether all greater than distance threshold, if then miss-configured neighboring cells are not certain the doubtful sub-district in the doubtful cell list, execution in step 210; Otherwise miss-configured neighboring cells are certain the doubtful sub-district in the doubtful cell list, execution in step 205.
Step 205: judge whether have only one of the latitude and longitude information difference of doubtful sub-district and UE contrast Serving cell, if then execution in step 206 less than distance threshold; Otherwise, execution in step 207.
Step 206: the pairing doubtful sub-district of current latitude and longitude information difference less than distance threshold is current miss-configured neighboring cells, execution in step 209.
Step 207: will compare with the latitude and longitude information difference that contrasts Serving cell less than each doubtful sub-district of distance threshold, obtain the minimum value of latitude and longitude information difference.
Step 208: the doubtful sub-district of current latitude and longitude information difference minimum value correspondence is current miss-configured neighboring cells.
Step 209: obtain the overall identification of current doubtful sub-district, then the overall identification of Huo Deing is the overall identification of miss-configured neighboring cells, finishes current handling process.
Step 210: the overall identification that can't discern current miss-configured neighboring cells.
In the network planning, owing to some special reason, network side does not allow some sub-district to participate in the switching of other sub-district, in view of this, in the present embodiment, can also be further set in advance the restriction switching cell tabulation that this sub-district refusal switches at each sub-district at network side, promptly network side is refused this sub-district and is switched listed sub-district in the tabulation of restriction switching cell.Before follow-up switching flow was carried out in the miss-configured neighboring cells of identifying overall identification, whether the contrast Serving cell of judging travelling carriage was in the restriction switching cell of miss-configured neighboring cells is tabulated, if then refuse miss-configured neighboring cells and participate in follow-up switching flow; Otherwise, allow this sub-district to participate in follow-up switching flow.
The sub-district of being mentioned is in this article: by base station section or the definite sub-district of base station section carrier frequency.
Method of the present invention is applicable to soft handover and direct-cut operation simultaneously.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1, a kind of changing method of discerning miss-configured neighboring cells is characterized in that, this method may further comprise the steps:
The local identities of each sub-district of carrying in the measurement result that A, network side report according to travelling carriage is discerned the overall identification of each sub-district, and judges whether to exist miss-configured neighboring cells according to the result of identification overall identification, if exist, and execution in step B then; Otherwise, execution in step C;
B, according to the local identities and the whole net cell parameter database of each miss-configured neighboring cells, discern the overall identification of each miss-configured neighboring cells; Follow-up switching flow is carried out in the sub-district of identifying overall identification in the miss-configured neighboring cells of identifying overall identification and the steps A, finish current handling process;
C, follow-up switching flow is carried out in the sub-district of identifying overall identification.
2, method according to claim 1, it is characterized in that, in the steps A, described result according to the identification overall identification judges whether to exist miss-configured neighboring cells to be: the overall identification of searching each sub-district of travelling carriage current area tabulation identification according to the local identities of each sub-district, judge whether also to exist the sub-district that does not have identified overall identification, if exist, then execution in step B; Otherwise, execution in step C.
3, method according to claim 1 is characterized in that, among the step B, and described local identities and whole net cell parameter database according to miss-configured neighboring cells, the overall identification of identification miss-configured neighboring cells is:
B1, in whole net cell parameter database, search the sub-district identical, set up the doubtful cell list of miss-configured neighboring cells with the miss-configured neighboring cells local identities;
The geographical location information of each doubtful sub-district in B2, the doubtful cell list of acquisition, and, determine it is the doubtful sub-district of miss-configured neighboring cells according to the geographical location information of each doubtful sub-district and the geographical location information of travelling carriage contrast Serving cell;
B3, basis are the doubtful sub-districts of miss-configured neighboring cells, obtain the overall identification of miss-configured neighboring cells.
4, method according to claim 3 is characterized in that, sets in advance distance threshold, and described geographical location information is a latitude and longitude information;
Among the step B2, described according to the geographical location information of each doubtful sub-district and the geographical location information of travelling carriage contrast Serving cell, determine that the doubtful sub-district of miss-configured neighboring cells is:
B21, obtain the latitude and longitude information of each doubtful sub-district, and the latitude and longitude information of each doubtful sub-district subtracted each other with the latitude and longitude information of contrast Serving cell obtain difference;
B22, judge each the doubtful sub-district calculate and contrast Serving cell the latitude and longitude information difference whether all greater than distance threshold, if, then can't be defined as the doubtful sub-district of current miss-configured neighboring cells, finish current handling process; Otherwise, execution in step B23;
Whether B23, judgement have only one less than the latitude and longitude information difference of distance threshold, if determine that then the pairing doubtful sub-district of current latitude and longitude information difference less than distance threshold is current miss-configured neighboring cells; Otherwise, execution in step B24;
B24, each difference is compared less than each doubtful sub-district of distance threshold latitude and longitude information difference with the contrast Serving cell, obtain minimum latitude and longitude information difference, determine that then the doubtful sub-district of minimum latitude and longitude information difference correspondence is current miss-configured neighboring cells.
5, according to claim 3 or 4 described methods, it is characterized in that,
When there was more than one Serving cell in travelling carriage, described contrast Serving cell was: Serving cell that signal quality is best or reference cell;
When only there was a Serving cell in travelling carriage, described contrast Serving cell was: the travelling carriage current service cell.
6, according to claim 3 or 4 described methods, it is characterized in that, at each sub-district the tabulation of restriction switching cell is set, among the step B, the sub-district of identifying overall identification in the miss-configured neighboring cells of identifying overall identification and the steps A is carried out before the follow-up switching flow, further comprises:
Judge that travelling carriage contrast Serving cell is whether in the restriction switching cell tabulation of miss-configured neighboring cells, if then refuse these miss-configured neighboring cells and participate in follow-up switching flow.
7, method according to claim 6 is characterized in that,
When there was more than one Serving cell in travelling carriage, described contrast Serving cell was: Serving cell that signal quality is best or reference cell;
When only there was a Serving cell in travelling carriage, described contrast Serving cell was: the travelling carriage current service cell.
According to the described method of arbitrary claim in the claim 1 to 4, it is characterized in that 8, described whole net cell parameter database is: write down the local identities of each sub-district and the database of overall identification corresponding relation in the network at least.
9, method according to claim 1 is characterized in that, this method further comprised before steps A: network side is provided with the identification range of each local identities;
Steps A comprises: the identification range of the local identities measurement result that network side reports described travelling carriage and each local identities of network side setting mates, with the local identities of each sub-district of carrying in the identification measurement result.
10, according to claim 1,2,3,4 or 9 described methods, it is characterized in that described sub-district is: by base station section or the definite sub-district of base station section carrier frequency.
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| WO2009043216A1 (en) * | 2007-09-29 | 2009-04-09 | Huawei Technologies Co., Ltd. | Method for detecting cell identity collisions |
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