CN102131215A - Method and system for optimizing handoff parameters - Google Patents
Method and system for optimizing handoff parameters Download PDFInfo
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- CN102131215A CN102131215A CN2010100006372A CN201010000637A CN102131215A CN 102131215 A CN102131215 A CN 102131215A CN 2010100006372 A CN2010100006372 A CN 2010100006372A CN 201010000637 A CN201010000637 A CN 201010000637A CN 102131215 A CN102131215 A CN 102131215A
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Abstract
The invention discloses a method and system for optimizing handoff parameters. The method comprises the following steps: a first base station to which a first target cell belongs sends preset information to a second base station to which a source cell belongs, wherein the preset information comprises handoff parameter information from the first target cell to a second target cell; and the handoff parameter is optimized by the second base station according to the preset information. According to the method and the system, the handoff parameters can be more accurately optimized, and network performance is improved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of handoff parameter optimization method and system.
Background technology
Self-organizing network (Self Organized Network abbreviates SON as) is a kind of technology of carrying out network configuration and optimization automatically.At Long Term Evolution (Long Term Evolution, abbreviate LTE as) in the system, can be by this technology so that LTE base station (EvolvedNodeB, abbreviate eNB as) according to the automatic configuration network parameter of specific measurement result, and carry out Automatic Optimal according to network change, thereby keep the network performance optimum, use manpower and material resources sparingly simultaneously.Particularly, the realization of LTE system self-optimization of switching parameter needs based on network operation conditions, switches relevant measurement, optimizes the sub-district gravity treatment and switches relevant parameter according to certain algorithm, to improve the performance of network.
Subscriber equipment (User Equipment, abbreviating UE as) process switched is as follows: network side is according to this sub-district and the signal quality of adjacent cells of user equipment to report, make handover decisions based on certain handoff algorithms, and carry out the execution of concrete switching flow according to the handover decisions notifying user equipment.In the process of carrying out handover decisions, inappropriate handoff parameter setting switching, handoff failure and Radio Link Failure (radio link failure that can cause rattling, abbreviate RLF as), these all are the switchings of not expecting, can cause negative effect to user experience, and can waste Internet resources.Therefore, for self-optimization of switching parameter, be to carry out the basis that handoff parameter is adjusted to the accurate judgement of handoff failure or the handoff scenario do not expected.
RLF after taking place in subscriber equipment, and the reconstruction that meeting is carried out Radio Resource control (Radio Resource Control abbreviates RRC as) according to the user profile of source base station or target BS reservation is upright.UE rebuilds in the upright request message at RRC, can carry customer equipment identification (UE-Identity), UE Radio Network Temporary Identifier (Cell Radio NetworkTemporary Identifier in the sub-district, abbreviate C-RNTI as), short medium access control integrity verification value (short Medium Access Control integrity protection, abbreviate shortMAC-I as) and/or cell physical address (Physical Cell Identity abbreviates PCI as).Wherein, C-RNTI distributes (scene of handoff failure) in the cell-of-origin, or (other scene) of distributing in the sub-district of triggering the RRC reconstruction; PCI is the physical address (scene of handoff failure) in the cell-of-origin, or at the physical address (other scene) that triggers the sub-district that RRC rebuilds.
UE can carry out cell selecting according to the quality of wireless signal carrying out the RRC reconstruction immediately.In addition, can carry out the judgement of handoff scenario according to RLF generation sub-district and the upright sub-district of RRC reconstruction, handoff scenario comprises normal handoff scenario and the handoff scenario of not expecting, wherein, the handoff scenario of not expecting comprises to be switched evening, switched too early, switches the scene of selecting wrong cell, switching fast, below the handoff scenario of not expecting was described in detail:
1. switched evening: as shown in Figure 1, among the Cell b of UE under eNB B RLF has taken place, attempted carrying out RRC then among the Cell a under eNB A and rebuild, illustrated that then the switching of this UE from Cell b to Cell a is late excessively.
2. switch too early: as shown in Figure 2, after switching to the Cell b under the eNB B the Cell a of UE under eNB A, soon just in Cell b Radio Link Failure has taken place, UE has selected Cell a to carry out RRC and has rebuild trial then, just get back to again and carry out RRC reconstruction trial in the sub-district before switching, just illustrate that then UE is too early to the switching of Cell b from Cell a.
3. switch and select wrong cell: as shown in Figure 3, UE Cell a under eNB A switches to RLF has just taken place after the Cell b under the eNB B soon, the Cell c of UE under eNB C carries out RRC reconstruction trial then, illustrate that then the eNB B Cellb down that eNB A selects is the switching target small area of mistake, correct switching target small area should be sub-district Cell c, and UE should carry out the switching from sub-district Cell a to sub-district Cell c.
4. switch fast: as shown in Figure 4, UE switches to behind the Cell b under the eNBB soon from the Cell a under the eNB A, switched to Cell c under the eNB C from Cell b again, promptly very short in the resident time of Cell b, UE is unnecessary to the switching of Cell b, UE should directly carry out the switching from Cell a to Cell c, and this scene may also be referred to as unnecessary switching.
In the correlation technique, the base station can be judged above-mentioned four kinds of handoff scenario of typically not expecting by the following method:
To the be correlated with information of RLF of eNB A is notified to eNB B, this process as shown in Figure 5, wherein the information of RLF comprise following one of at least: C-RNTI, short MAC-I in the sub-district takes place at RLF in the Cell Global Identity (Evolved Cell Global Identifier abbreviates ECGI as), UE that PCI, the RRC of the sub-district that RLF takes place rebuilds the evolution of attempting.PCI, the UE of the sub-district that RLF takes place is to rebuild message from eNB A from the RRC that UE receives in C-RNTI and the short MAC-I information that RLF takes place in the sub-district.ENB B receives the information of RLF, according to the contextual information of wherein UE (promptly, PCI and C-RNTI information) judge the type of handoff scenario, particularly, if just having switched from Cell a, this UE comes, then eNB B judges the too early to the switching of Cell b from Cell a of this UE, and notice eNB A; If there be not the contextual information corresponding with this UE, eNB B judges that the switching of UE from Cell b to Cell a is late excessively.
ENB C is notified to eNB B with the RLF relevant information, wherein the information of RLF comprise following one of at least: C-RNTI, short MAC-I in the sub-district takes place at RLF in the Cell Global Identity (Evolved Cell Global Identifier abbreviates ECGI as), UE that PCI, the RRC of the sub-district that RLF takes place rebuilds the evolution of attempting.The PCI of the sub-district that RLF takes place and UE are to rebuild message from eNB C from the RRC that UE receives in the C-RNTI information that RLF takes place in the sub-district.Come if this UE has just switched from Cell a, then eNB B judges the Target cell selection mistake of the switching of UE from Cell a to Cell b, and correct Target cell should be sub-district Cell c, and notice eNB A; UE switches away from Cell b, if this UE just switches from Cell a, what then eNB B judged this UE is quick switching from Cell a to Cell b to the switching of Cell c, just unnecessary switching, and notice eNB A.
In the correlation technique, the base station can be carried out the optimization of handoff parameter according to the judged result of handoff scenario type.Yet because the base station when carrying out the optimization of handoff parameter, has only obtained the type information of handoff scenario, and can't obtain the handoff parameter information of concrete Target cell, therefore, it is unsatisfactory to optimize effect.
Summary of the invention
Main purpose of the present invention is to provide a kind of handoff parameter optimization method and system, can't obtain the handoff parameter information of concrete Target cell with in the solution correlation technique because base station and cause handoff parameter to optimize the unfavorable problem of effect.
One aspect of the present invention provides a kind of handoff parameter optimization method, comprise: second base station of first base station under first Target cell under the cell-of-origin sends predetermined information, wherein, predetermined information comprises the handoff parameter information of first Target cell to second Target cell; Handoff parameter optimization is carried out according to predetermined information in second base station.
Another aspect of the present invention provides a kind of handoff parameter optimization system, comprise: first base station, it is the serving BS of first Target cell, second base station that is used under the cell-of-origin sends predetermined information, wherein, predetermined information comprises the handoff parameter information of first Target cell to second Target cell; Second base station is used to receive predetermined information, and carries out handoff parameter optimization according to predetermined information.
By the present invention, adopt the affiliated base station of base station under the cell-of-origin of switching target small area of cell-of-origin to send the handoff parameter information of this switching target small area to other sub-districts, make the base station under the cell-of-origin can carry out the optimization of handoff parameter according to handoff parameter information, having solved the handoff parameter information that in the correlation technique because base station can't obtain concrete Target cell causes handoff parameter to optimize the unfavorable problem of effect, make that the optimization of handoff parameter is more accurate, improved network performance.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is a kind of schematic diagram that switched the evening show scape according to correlation technique;
Fig. 2 is a kind of schematic diagram that switches too early scene according to correlation technique;
Fig. 3 is a kind of schematic diagram of selecting the wrong cell scene that switches according to correlation technique;
Fig. 4 is the schematic diagram according to a kind of fast switching scene of correlation technique;
Fig. 5 is according to the schematic diagram that transmits RLF information in the LTE system of correlation technique;
Fig. 6 is the flow chart according to the handoff parameter optimization method of the embodiment of the invention;
Fig. 7 passs the schematic diagram of handover report information by the X2/S1 oral instructions in the LTE system according to the embodiment of the invention;
Fig. 8 is the structured flowchart according to the handoff parameter optimization system of the embodiment of the invention;
Fig. 9 is the detailed block diagram according to the handoff parameter optimization system of the embodiment of the invention.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
The embodiment of the invention provides a kind of handoff parameter optimization method, and Fig. 6 is the flow chart according to the handoff parameter optimization method of the embodiment of the invention, and as shown in Figure 6, this method comprises:
Second base station of first base station under the step S602, first Target cell under the cell-of-origin sends predetermined information, and wherein, described predetermined information comprises the handoff parameter information of first Target cell to second Target cell;
Step S604, handoff parameter optimization is carried out according to predetermined information in second base station.
In the prior art, first base station only sends handoff scenario information to second base station, the optimization of handoff parameter is carried out according to this handoff scenario information in second base station, and in fact, system to the optimization means that different handoff scenario adopted be pre-set (for example, mapping relations of predefined scene and threshold shift or the like), that is to say, a kind of optimization means of handoff scenario generally has only one or more, can't be optimized as the case may be, this optimal way precision is lower, and it is also not ideal enough to optimize effect.Difference and prior art, the said method that the embodiment of the invention provides makes first base station send the predetermined information that comprises handoff parameter information to second base station, make second base station to carry out meticulousr handoff parameter optimization according to predetermined information, feasible optimization is more accurate, has improved network performance.
Preferably, be under the situation of predetermined scene in current handoff scenario, second base station of first base station under first Target cell under the cell-of-origin sends predetermined information, and wherein, predetermined scene comprises: switching is too early, wrong cell is selected in switching or switching fast.Pass through said process, set first base station sends opportunity from handoff parameter information to second base station, can be so that under the situation of the scene that occurs not expecting, just carry out the feedback of handoff parameter information, otherwise, under normal scene, be defaulted as and need not to carry out handoff parameter optimization, this method can be saved Internet resources, and because the handoff parameter under the normal scene is generally proper, the optimization of not carrying out handoff parameter is very little to the influence of optimizing effect, optimization precision.
Below several situations of predetermined scene are described respectively:
In predetermined scene is to switch under the too early situation, first Target cell is the sub-district that Radio Link Failure RLF occurs, and second Target cell is the UE that occurs RLF in first Target cell Target cell attempting RRC and rebuild (or claiming RRC to rebuild upright sub-district of selecting of attempting) and identical with the cell-of-origin;
For switching under the situation of selecting wrong cell, first Target cell is the sub-district that RLF occurs in predetermined scene, and second Target cell is that the UE that occurs RLF in first Target cell attempts the Target cell that RRC rebuilds;
In predetermined scene is under the situation about switching fast, second Target cell be user equipment (UE) after switching to first Target cell from the cell-of-origin, the Target cell that next time switches from first Target cell in the given time.
Preferably, in predetermined scene is under the situation about switching fast, predetermined information also comprise following one of at least: the Cell Global Identity of the evolution of predetermined cell, UE switch to the switch reasons of first Target cell, UE switches to second Target cell from first Target cell switch reasons from the cell-of-origin, wherein, predetermined cell comprise following one of at least: cell-of-origin, first Target cell, second Target cell.Under the scene of switching fast, the information more than further sending on the basis of handoff parameter information can help the optimization of handoff parameter so that second base station obtains more handover relevant information.
Preferably, the content of handoff parameter information can comprise following one of at least: the sub-district biasing of cell-level handover trigger thresholding, measurement event, the frequency offset of measurement event, wherein, the cell-level handover trigger thresholding thresholding that to be current area initiate handover preparation request to abutting subdistrict, measurement event can comprise following one of at least: A1 incident, A2 incident, A3 incident, A4 incident, A5 incident, B1 incident, B2 incident.Need to prove, the embodiment of the invention has provided the particular content of handoff parameter information, yet in actual applications, the particular content of handoff parameter information also can be other the information that foundation and reference can be provided for handoff parameter optimization, and the embodiment of the invention does not limit this.
The sub-district biasing (cell Individual Offset) of above-mentioned measurement event can comprise the sub-district biasing (cell Individual Offset) of abutting subdistrict and/or the Serving cell of UE; The frequency offset of measurement event (offset Freq) can comprise the abutting subdistrict of UE and/or the frequency offset of Serving cell correspondence (offset Freq).
Preferably, above-mentioned predetermined information can also comprise current handoff scenario information, information such as promptly above-mentioned switching is too early, handoff error Target cell, quick switching.
Preferably, first base station under first Target cell comprises to the transmission predetermined information of second base station under the source base station: predetermined information is carried in first base station under first Target cell in handover report information; First base station under first Target cell is sent to second base station under the cell-of-origin with handover report information.As a kind of mode of saving Internet resources more, the handoff scenario information of feeding back in above-mentioned handoff parameter information and the prior art can be carried in handover report information jointly, second base station is optimized preliminary treatment (promptly, the handover relevant information that parsing receives) in the process, analyzing efficiency is higher, simultaneously, Internet resources have also been saved.
Need to prove, handoff parameter information can be as described in the above-mentioned process, in handover report information, carry, but in specific implementation process, also can in other existing information, carry, perhaps carry in for the newly-increased information of this handoff parameter information, the embodiment of the invention does not limit this.
In addition, transmit when handoff parameter information can be with the handoff scenario information of same, can not transmit simultaneously yet, can transmit in same information/message, can transmit separately yet, the embodiment of the invention does not limit this.
Preferably, first base station under first Target cell can be carried in handover report information among the handover report message HANDOVER REPORT by predetermined interface and be sent to second base station under the cell-of-origin, wherein, it is one of following that predetermined interface comprises: X2 interface, S1 interface, but be not limited thereto.
Example 1
Describe the handoff parameter optimizing process that switches under the too early scene in detail below in conjunction with Fig. 2, Fig. 5 and Fig. 7, may further comprise the steps:
Step 101, UE switches to sub-district Cell b (that is first Target cell) under the eNB B (that is first base station) from the sub-district Cell a (that is, the cell-of-origin) under the eNB A (that is second base station);
Step 102, UE switches to Radio Link Failure has just taken place under the Cell b soon, UE has selected at sub-district Cell a (promptly according to the cell selecting process, second Target cell, in this example, identical with the cell-of-origin) carry out RRC and rebuild to attempt, just get back to again and carry out RRC in the sub-district before switching and rebuild uprightly, UE sends RRC for eNB A and rebuilds upright request message.
Step 103, eNB A receives that the RRC of UE rebuilds upright request message, according to wherein RLF cell information takes place the RLF indication information is sent to eNB B.The RLF indication information can contain the PCI information of the sub-district Cell b of RLF generation, RRC rebuilds Cell Global Identity (the Evolved Cell Global Identifier of the evolution of the sub-district Cell a that attempts, abbreviating ECGI as) C-RNTI information under the Cell b of sub-district takes place at RLF in information, UE, in the short MAC integrity verification value (short MAC-I) one or multinomial, as shown in Figure 5, in the LTE system, eNB A can transmit RLF indication information (that is RLF information) to eNB B by the X2/S1 mouth.
Step 104, eNB B receives the RLF indication information of eNB A, by be provided with to contextual timer that should UE, can know that UE in the Cell of this base station b RLF has taken place, carry out RRC then among the Cell a in eNB A and rebuild and attempt.According to the handover information of this UE last time that keeps, it is too early that eNB B adjudicates the switching of this UE from Cell a to Cellb, and promptly above-mentioned handoff scenario is for switching too early.
Step 105, eNB B sends handover report information to eNB A, in handover report information, contain switch too early scene indication (promptly, handoff scenario information), Cell a has taken place to the too early switching behavior of the switching of Cell b in notice eNB A, in handover report information, also can contain the handoff parameter information of Cell b to Cell a, above-mentioned handoff parameter information can comprise following one of at least: the sub-district biasing of cell-level handover trigger thresholding, measurement event, the frequency offset of measurement event.As shown in Figure 7, in the LTE system, eNB B can transmit handover report information to eNB A by the X2/S1 mouth, for example can transmit described handover report information by handover report message HANDOVER REPORT.
Step 106, eNB A carries out the optimization of handoff parameter to the handoff parameter information of Cell a according to handoff scenario information and Cell b, for example can adjust the threshold parameter of Cell a to the handoff parameter information of Cell a according to Cell b to the switching of Cell b, can improve and trigger the threshold value of Cell a, avoid or reduce from Cell a to the too early generation of the switching of Cell b to the switching of Cell b.
Example 2
Describe the handoff parameter optimizing process that switches under the scene of selecting wrong cell in detail below in conjunction with Fig. 3, Fig. 5 and Fig. 7, may further comprise the steps:
Step 201, UE switches to sub-district Cell b (that is first Target cell) under the eNB B (that is first base station) from the sub-district Cell a (that is, the cell-of-origin) under the eNB A (that is second base station);
Step 202, UE switches to Radio Link Failure has just taken place under the Cell b soon, and UE has selected to carry out RRC at sub-district Cell c (that is, second Target cell) according to the cell selecting process and has rebuild, and UE sends RRC for the eNB C of Cell c correspondence and rebuilds upright request message.
Step 203, eNB C receives that the RRC of UE rebuilds upright request message, according to wherein RLF cell information takes place the RLF indication information is sent to eNB B.RLF information can contain the PCI information of the sub-district Cell b that RLF takes place, and the ECGI information, UE that RRC rebuilds the sub-district Cell c that attempts takes place in the C-RNTI information, short MAC integrity verification value (short MAC-I) under the Cell b of sub-district one or multinomial at RLF.As shown in Figure 5, in the LTE system, eNB C can transmit RLF information to eNB B by the X2/S1 mouth.
Step 204, eNB B receives the RLF information of eNB C, by be provided with to contextual timer that should UE, can know that UE in the Cell of this base station b RLF has taken place, carry out RRC then among the Cell c in eNB C and rebuild and attempt.Determine that according to the handover information of this UE last time that keeps this UE just switches to sub-district Cell b from sub-district Cell a again, then eNB B adjudicates this UE and has selected wrong switching target small area from Cell a to the switching of Cell b, promptly, above-mentioned handoff scenario is selected wrong cell for switching, and correct Target cell is Cell c.
Step 205, eNB B sends handover report information to eNB A, containing the scene that has switched to wrong cell in handover report information indicates (promptly, handoff scenario information), Cell a has selected wrong switching target small area to the switching of Cell b switching behavior has taken place in notice eNB A, correct Target cell is Cell c, in handover report information, also can contain the handoff parameter information of Cell b to Cell c, above-mentioned handoff parameter information can comprise following one of at least: cell-level handover trigger thresholding, the sub-district biasing of measurement event, the frequency offset of measurement event.As shown in Figure 7, in the LTE system, eNB B can transmit handover report information to eNB A by the X2/S1 mouth, for example can transmit described handover report information by handover report message HANDOVER REPORT.
Step 206, eNB A carries out the optimization of handoff parameter to the handoff parameter information of Cell c according to handoff scenario information and Cell b, for example can adjust the handoff threshold parameter of Cell a to the handoff parameter information of Cell c according to Cell b to Cell b and Cell a to Cell c, for example can improve and trigger the threshold value of Cell a to the switching of Cell b, reduce the threshold value of Cell a, avoid or reduce the generation of having selected wrong switching target small area from Cell a to the switching of Cell b to the switching of Cellc.
Example 3
Describe the handoff parameter optimizing process under the scene of quick switching below in conjunction with Fig. 4, Fig. 5 and Fig. 7 in detail, may further comprise the steps:
Step 301, the sub-district Cell a of UE under the eNB A (that is second base station) is (promptly, the cell-of-origin) switches to sub-district Cell b (that is first Target cell) under the eNB B (that is first base station), resident very short time has switched to the Cell c among the eNB C again under Cell b.
Step 302, eNB B at UE when successful switch is to Cell b under the Cell a of sub-district, be provided with a timer (timing of timer is the scheduled time), if UE just carried out from Cell b to Cell c (promptly in the scheduled time of timer, second Target cell) switching, then eNB B judges that the quick switching to Cell c has taken place from Cell a to Cell b UE again.
Step 303, eNB B sends handover report information to eNB A, Cell a arrives Cell c again to Cell b quick switching behavior has taken place in notice eNB A, in handover report information, contain the ECGI information of indication (being handoff scenario information), Cell a and/or the Cell b and/or the Cell c of the scene of quick switching or unnecessary switching, switch reasons that UE switches from Cell a to Cell b, switch reasons that UE switches from Cell b to Cell c, Cellb to the contents such as handoff parameter information of Cell c or multinomial.As shown in Figure 7, in the LTE system, eNB B transmits handover report information by the X2/S1 mouth to eNB A, for example can transmit described handover report information by handover report message HANDOVER REPORT.
Step 304, eNB A carries out the optimization of handoff parameter to the handoff parameter information of Cell c according to handoff scenario information and Cell b, for example can adjust the handoff threshold parameter of Cell a to the handoff parameter information of Cell c according to Cell b to Cell b and Cell a to Cell c, for example can improve and trigger the threshold value of Cell a to the switching of Cell b, reduce the threshold value of Cell a, avoid or reduce from Cell a to Cell b again quick switching to Cell c to the switching of Cellc.
At above-mentioned example 1 to example 3, the parameter information that decision algorithm when first Target cell is meant that to the handoff parameter information of second Target cell judgement UE initiates switching from first Target cell to second Target cell first Target cell needs can be to dispose in first Target cell.
The embodiment of the invention also provides a kind of handoff parameter optimization system, Fig. 8 is the structured flowchart according to the handoff parameter optimization system of the embodiment of the invention, as shown in Figure 8, this system comprises: first base station 82, it is the serving BS of first Target cell, be used for sending predetermined information to second base station 84, wherein, predetermined information comprises the handoff parameter information of first Target cell to second Target cell; Second base station 84, it is the serving BS of cell-of-origin, is connected in first base station 82, is used to receive predetermined information, and carries out handoff parameter optimization according to predetermined information.
Fig. 9 is the detailed block diagram according to the handoff parameter optimization system of the embodiment of the invention, and as shown in Figure 9, on the basis of Fig. 8, first base station 82 comprises: configuration module 92 is used for carrying predetermined information in handover report information; Sending module 94 is connected in configuration module 92, is used for handover report information is sent to second base station 84.
The handoff parameter optimization method that the embodiment of the invention provides passes through feedback handoff parameter information, and carries out the optimization of handoff parameter according to handoff parameter information, has reduced waste of network resources, has improved the performance of network, thereby has realized the self-optimization function of network.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a handoff parameter optimization method is characterized in that, comprising:
Second base station of first base station under first Target cell under the cell-of-origin sends predetermined information, and wherein, described predetermined information comprises the handoff parameter information of described first Target cell to second Target cell;
Handoff parameter optimization is carried out according to described predetermined information in described second base station.
2. method according to claim 1, it is characterized in that, in current handoff scenario is under the situation of predetermined scene, described second base station of described first base station under described cell-of-origin under described first Target cell sends described predetermined information, wherein, described predetermined scene comprises: switch too early, switch and select wrong cell or quick the switching.
3. method according to claim 2 is characterized in that,
In described predetermined scene is under the too early situation of described switching, described first Target cell is the sub-district that Radio Link Failure RLF occurs, described second Target cell is that the user equipment (UE) that occurs described RLF in described first Target cell is attempted the Target cell that RRC rebuilds, and identical with described cell-of-origin;
In described predetermined scene is that described switching is selected under the situation of wrong cell, and described first Target cell is the sub-district that RLF occurs, and described second Target cell is that the UE that occurs described RLF in described first Target cell attempts the Target cell that RRC rebuilds;
In described predetermined scene is under the situation of described quick switching, described second Target cell be UE after switching to described first Target cell from described cell-of-origin, the Target cell that next time switches from described first Target cell in the given time.
4. method according to claim 2, it is characterized in that, in described predetermined scene is under the situation of described quick switching, described predetermined information also comprise following one of at least: the Cell Global Identity of the evolution of predetermined cell, UE switch to the switch reasons of described first Target cell, described UE switch to described second Target cell from described first Target cell switch reasons from described cell-of-origin, wherein, described predetermined cell comprise following one of at least: described cell-of-origin, described first Target cell, described second Target cell.
5. method according to claim 1, it is characterized in that, the content of described handoff parameter information comprise following one of at least: the sub-district biasing of cell-level handover trigger thresholding, measurement event, the frequency offset of measurement event, wherein, the described cell-level handover trigger thresholding thresholding that to be current area initiate handover preparation request to abutting subdistrict, described measurement event comprise following one of at least: A1 incident, A2 incident, A3 incident, A4 incident, A5 incident, B1 incident, B2 incident.
6. method according to claim 5 is characterized in that, the sub-district biasing of described measurement event comprises the sub-district biasing of abutting subdistrict and/or the Serving cell of UE; The frequency offset of described measurement event comprises the abutting subdistrict of UE and/or the frequency offset of Serving cell correspondence.
7. method according to claim 1 is characterized in that, described predetermined information also comprises: current handoff scenario information.
8. according to each described method in the claim 1 to 7, it is characterized in that described first base station under described first Target cell sends described predetermined information to described second base station and comprises:
Described predetermined information is carried in described first base station under described first Target cell in handover report information;
Described first base station under described first Target cell is sent to described second base station under the described cell-of-origin with described handover report information.
9. method according to claim 8 is characterized in that, described first base station under described first Target cell comprises described second base station that described handover report information is sent under the described cell-of-origin:
Described first base station under described first Target cell is carried among the handover report message HANDOVER REPORT described handover report information by predetermined interface and is sent to described second base station under the described cell-of-origin, wherein, described predetermined interface comprises one of following: X2 interface, S1 interface.
10. a handoff parameter optimization system is characterized in that, comprising:
First base station is the serving BS of first Target cell, and second base station that is used under the cell-of-origin sends predetermined information, and wherein, described predetermined information comprises the handoff parameter information of described first Target cell to second Target cell;
Described second base station is used to receive described predetermined information, and carries out handoff parameter optimization according to described predetermined information.
11. system according to claim 10 is characterized in that, described first base station comprises:
Configuration module is used for carrying described predetermined information in handover report information;
Sending module is used for described handover report information is sent to described second base station.
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| CN102131215A true CN102131215A (en) | 2011-07-20 |
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| WO2016112670A1 (en) * | 2015-01-16 | 2016-07-21 | 中兴通讯股份有限公司 | Method and device for cell switching optimization and evaluation |
| CN107864481A (en) * | 2016-09-22 | 2018-03-30 | 中兴通讯股份有限公司 | Neighbor cell optimizing method, device and base station |
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| WO2013071476A1 (en) * | 2011-11-14 | 2013-05-23 | 富士通株式会社 | Method for determining unnecessary handover, and base station |
| CN103918300A (en) * | 2012-01-20 | 2014-07-09 | 富士通株式会社 | Method for analyzing cause of link failure and devices thereof |
| CN103918300B (en) * | 2012-01-20 | 2018-05-25 | 富士通株式会社 | Analyze the method and its device of link failure reason |
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| CN102547764A (en) * | 2012-02-01 | 2012-07-04 | 电信科学技术研究院 | Method, system and device for improving mobile robustness |
| WO2013113247A1 (en) * | 2012-02-01 | 2013-08-08 | 电信科学技术研究院 | Method, system and device for increasing mobility robustness |
| CN102547764B (en) * | 2012-02-01 | 2014-09-10 | 电信科学技术研究院 | Method, system and device for improving mobile robustness |
| CN104919877A (en) * | 2013-01-17 | 2015-09-16 | Kddi株式会社 | Terminal device, base station device, communications system, and communications method |
| WO2016112670A1 (en) * | 2015-01-16 | 2016-07-21 | 中兴通讯股份有限公司 | Method and device for cell switching optimization and evaluation |
| CN107864481A (en) * | 2016-09-22 | 2018-03-30 | 中兴通讯股份有限公司 | Neighbor cell optimizing method, device and base station |
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