CN101932015B - Handoff parameter adjusting method and device - Google Patents
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Abstract
The invention discloses a handoff parameter adjusting method and device; in the method, as the handoff parameter adjustment caused by load balancing is limited by the handoff parameter adjustment caused by mobility robustness optimization, specifically, the handoff parameter is configured to satisfy the following conditions for the handoff parameter adjustment caused by the load balancing between a first cell and a second cell: the parameter is between the handoff premature point and the handoff late point of the mobility robustness optimization of the first cell; and a handoff protecting area exists between the first cell and the second cell. The invention can improve the network optimizing performance.
Description
Technical field
The present invention relates to the communications field, particularly, relate to handoff parameter adjusting method and device.
Background technology
Long Term Evolution (Long Term Evolution, referred to as LTE) network is by E-UTRAN (Evolved UTRAN) base station eNB (Evolved NodeB) and evolution packet switching center (Evolved Packet Core, referred to as EPC) form network configuration flattening.Wherein, the set that E-UTRAN comprises the eNB being connected by S1 interface with EPC, can connect by X2 between eNB.S1, X2 are logic interfacing.An EPC can manage one or more eNB, and a NodeB also can be controlled by a plurality of EPC, and an eNB can manage one or more communities.LTE-A system is by LTE system evolved, and the network architecture is consistent with LTE.
MANET (Self Organization Network, referred to as SON) is a kind of technology of automatically carrying out network configuration and optimization.The feature of this technology is self-configuring, self-optimizing, the application of this technology in LTE make LTE base station (eNB) can be according to certain measurement automatic configuration network parameter, and carry out Automatic Optimal according to network change, thus keep network performance optimum, save a large amount of manpower and materials simultaneously.In SON, comprise load balancing optimization and handoff parameter optimization.
Load balancing optimization (MLB, Mobility Load balancing optimisation) target is to optimize cell reselection/handoff parameter, to tackle unbalanced traffic load, and be minimised as and reach the required switching of load balancing and redirected number of times.Mobility parameters in preload self-optimizing LTE and between RAT for community and adjacent area, can improve power system capacity and compare cell reselection/handoff parameter that static state/nothing is optimized.Such optimization can also minimize the manual intervention in network management and optimization task.Load balancing should not have negative effect to user's QoS.
At present, the solution of load balancing optimization is as follows: by a kind of algorithm, determine that distributing user equipment (User Equipment, referred to as UE) is resident or be connected to Yi Ge community, with balanced traffic load.This can be by postponing or the in advance switching of minizone UE reaches.
The action that load balancing optimization comprises is as follows:
(1) load of eNB monitoring jurisdiction district, and by X2 or S1 interface and adjacent node exchange pertinent information.For example, by the load in smaller interval,, type of ongoing business, cell configuration etc. determine whether to distribute cell load to abutting subdistrict or common coverage cell, comprise different RAT community.(2) eNB jurisdiction district and one or more neighboring interval switch and/or cell reselection parameters revise to be consulted, and make can more easily switch/gravity treatment of terminal in cell edge to the relatively Qing community of loading.
Due to inappropriate switching (Handoff, referred to as HO) parameter setting can cause HOping-pong (pingpang handoff), HO failures (handoff failure) and Radio Link Failures (Radio Link Failure, RLF), user's experience is caused negative effect and can waste Internet resources, therefore, need to carry out mobility optimization (MRO, Mobility robustnessoptimisation).But not causing the HO failure of RLF is can find with visible for user, the RLF that the HO parameter settings of mistake causes experiences for user and network performance has impact.Therefore, the main purpose of mobility optimization is exactly to reduce the relevant RLF of HO.Further, unoptimizable HO parameter configuration, even without causing RLF, also can cause the degradation of service quality.For example, for the mistake setting of HO hysteresis, can cause pingpang handoff or in unoptimizable community residence time long.Therefore, second object of mobility optimization is exactly to reduce unnecessary switching or the switching of loss, to improve network performance.
The process that terminal is switched in network is as follows: network side is according to the signal quality of terminal to report Zhe community and adjacent area, and the handoff algorithms based on certain is made handover decisions, then, according to handover decisions notification terminal, carries out concrete switching flow.For self-optimization of switching parameter, to the accurate judgement of handoff failure or less desirable handoff scenario, be the basis of carrying out handoff parameter adjustment.
HO unsuccessfully can be categorized as: the failure that (1) HO causes excessively evening; (2) failure that HO causes too early; (3) failure that wrong cell causes.
Fig. 1 shows the excessively late scene of a kind of switching, and as shown in Figure 1, UE in Cell b, RLF has occurred under eNB B, then in the Cell a under eNB A, attempts carrying out RRC reconstruction.Illustrate from GaiUECong community Cell b excessively late to the switching of community Cell a.
Fig. 2 shows a kind of too early scene of switching, as shown in Figure 2, be switched to eNB B Xia community Cell b from the Cell a of eNB A Xia community after, just in Cell b, there is RLF soon in UE, then, UE has selected community Cell a to carry out RRC reconstruction, namely gets back to again to switch in Qian community and carries out RRC reconstruction.Illustrate that UECong community Cell a is too early to the switching of community Cell b.
Fig. 3 shows a kind of scene of selecting wrong cell of switching, and as shown in Figure 3, the Cell c of UE from eNB C, after being switched to the Cell b under eNB B, RLF has just occurred soon, and then, UE carries out RRC reconstruction at eNB A Xia community Cell a.Under the eNB B that explanation is selected, Cell b is wrong Target cell, and correct Target cell is community Cell a, that is to say, UE should directly carry out the switching from community Cell c to community Cell a.
From above description, load balancing optimization and mobility optimizing process are all by adjusting handoff parameter, to reach the object of the network optimization, but, because these the two kinds reasons of optimizing scenario triggered are different, , the optimization of load balancing handoff parameter is to take minizone load difference as judgement foundation, the optimization of mobility handoff parameter is to take cell signal quality as judgement foundation, and load balancing optimization and mobility optimization are separate, therefore, after load balancing optimization is adjusted current handoff parameter, if it is improper that handoff parameter is adjusted, can cause the performance of handoffs of minizone to decline, cause the generation of terminal RLF, affect user satisfaction,
Summary of the invention
Consider that the load balancing optimization that exists in correlation technique and mobility optimize separately, cannot reach the problem of network optimization optimum and propose the present invention, for this reason, the present invention aims to provide a kind of improved handoff parameter adjusting method, in order to address the above problem.
The invention discloses a kind of handoff parameter adjusting method, wherein, for the handoff parameter adjustment being caused by the load balancing handoff parameter causing in mobility optimization that is tied, adjust.
Preferably; for the handoff parameter adjustment between the first community and the second community causing due to load balancing; the handoff parameter of the first community is set to meet following condition: between the switching of the mobility optimization of the first community cross earlier and switched late between, and make to have switch protecting region between the first community and the second community.
Preferably, by carrying out following one of arrange, make to exist between the first community and the second community switch protecting region:
Va > Wa and Vb > Wb;
Va≤-Wa and Vb > Wb, and | Vb| > | Va|;
Vb≤-Wb and Va > Wa, and | Va| > | Vb|;
Wherein, Va is the handoff parameter of the first community, and Wa is the switching guard interval of the first community, and Vb is the handoff parameter of the second community, and Wb is the switching guard interval of the second community.
Wherein, switch protecting region is the region between the handoff boundary of the first community and the handoff boundary of the second community, and in switch protecting region, subscriber equipment resides in former Serving cell.Preferably, if the first community when preload is higher than the preload of work as of the second community, dwindle the handoff boundary of the first community or the handoff boundary of expansion the second community.
According to a further aspect in the invention, provide a kind of handoff parameter adjusting device, this device comprises: the first determining unit, and for the switching of definite community, cross earlier and switched late; The second determining unit, for determining the handoff boundary of community; Adjustment unit, for based on switching earlier, switching late, to switch Liang Ge community handoff boundary separately, carries out handoff parameter adjustment.
Preferably, handoff parameter adjustment comprises: make handoff parameter adjusting range between the switching of the mobility optimization of the first community cross earlier and switched late between, and make to have switch protecting region between the first community and the second community.
Preferably, by carrying out following one of arrange, make to exist between the first community and the second community switch protecting region:
Va > Wa and Vb > Wb;
Va≤-Wa and Vb > Wb, and | Vb| > | Va|;
Vb≤-Wb and Va > Wa, and | Va| > | Vb|;
Wherein, Va is the handoff parameter of the first community, and Wa is the switching guard interval of the first community, and Vb is the handoff parameter of the second community, and Wb is the switching guard interval of the second community.
Preferably, said apparatus also comprises: handoff boundary adjustment unit, be used for according to the preload of working as of Liang Ge community, handoff boundary to community is adjusted, if the first community when preload is higher than the preload of work as of the second community, dwindle the handoff boundary of the first community or the handoff boundary of expansion the second community.
Above-mentioned at least one technical scheme providing by the embodiment of the present invention, the handoff parameter adjusting range that load balancing optimization is caused retrains, make the handoff parameter adjustment that load balancing optimization causes reduce the ambulant impact on minizone as far as possible, processing than carrying out separately load balancing optimization and mobility in prior art and optimizing, can further improve network optimizing performance.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, or understand by implementing the present invention.Object of the present invention and other advantages can be realized and be obtained by specifically noted structure in the specification write, claims and accompanying drawing.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, for explaining the present invention, is not construed as limiting the invention together with embodiments of the present invention.In the accompanying drawings:
Fig. 1 be according to the switching of correlation technique the schematic diagram of evening show scape;
Fig. 2 is according to the schematic diagram of the too early scene of switching of correlation technique;
Fig. 3 selects the schematic diagram of the scene of wrong cell according to the switching of correlation technique;
Fig. 4 is according to switching too early/switched the schematic diagram in evening in the CELL A of the embodiment of the present invention;
Fig. 5 and Fig. 6 optimize under scene and in CELLA/CELL B, switch too early/switched the schematic diagram in evening according to the mobility of the embodiment of the present invention;
Fig. 7 to Fig. 9 is according to the schematic diagram of the switching guard interval of the embodiment of the present invention;
Figure 10 shows the schematic diagram of adjusting according to the handoff parameter of the embodiment of the present invention;
Figure 11 to Figure 13 adjusts schematic diagram according to the handoff boundary of the embodiment of the present invention;
Figure 14 to Figure 16 adjusts schematic diagram according to the handoff boundary of the embodiment of the present invention;
Figure 17 is according to the structured flowchart of the handoff parameter adjusting device of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described.If do not conflicted, the feature in the embodiment of the present invention and embodiment can combine mutually.
According to the embodiment of the present invention, a kind of improved handoff parameter adjusting method is provided, the method is suitable for being applied in LTE/LTE-A system, particularly, the embodiment of the present invention provides a kind of handoff parameter adjustment ground scheme of how carrying out under load balancing optimization and mobility optimization scene, wherein, when carrying out load balancing optimization, consider to occur handoff threshold corresponding to these switching problems, when load balancing optimization is adjusted handoff parameter, adjusting range is limited in the scope that mobility optimization allows, , the handoff parameter adjusting range that load balancing optimization causes is tied and optimizes handoff parameter adjusting range in mobility, like this, can guarantee the coordinate operation that load balancing optimization and mobility are optimized, the handoff parameter adjustment that load balancing optimization is caused reduces to minimum to the impact of minizone mobility effect, make handoff parameter adjust optimization, reach the object of network self-organization.
Fig. 4 has provided in CELL A and has switched too early/switched the schematic diagram in evening.In Fig. 4, for CELL A, abscissa R represents distance, ordinate RSRP representation signal intensity.CELL A is by the relevant statistics of inner mobility optimization, for example, performance of handoffs counters count, can judge the too early switching point (Ra is too early) of CELL A and the late switching point of mistake (Ra is excessively late) of CELL A, and circular can be as described below:
Conventionally, the measurement event A3 of utilization (Event A3) carries out switch decision:
Event?A3(Neighbor?becomes?offset?better?than?serving)
Inequality?A3-1(Entering?condition)
Mn+Ofn+Ocn-Hys＞Ms+Ofs+Ocs+Off
That is:
Mn＞Ms+(Ofs-Ofn)+(Ocs-Ocn)+Off+Hys
If: O=(Ofs-Ofn)+(Ocs-Ocn)+Off
: Mn > Ms+O+Hys
Wherein, Ms represents the signal quality of Serving cell, Mn represents the signal quality of adjacent area, Ofs represents the frequency particular offset of service frequency, Ofn represents the frequency particular offset of adjacent area frequency, and Ocs represents the cell specific offset of Serving cell, and Ocn represents the cell specific offset of abutting subdistrict, Off represents the skew of A3 event, and Hys represents the sluggishness of A3 event.
For CELLA:
When Mn > Ms+O1+Hys, switch, establish O1+Hys=Va
Suppose that probability or number of times that Va1 represents that terminal occurs to switch too early in CELL A surpass threshold value, when Va < Va1, also when UE is more easily switched to CELL B from CELL A, the possibility of too early switching is larger.Suppose that probability or number of times that Va2 represents that terminal occurred to switch in CELL A evening surpass threshold value, when Va > Va2, also, when UE is more difficult while being switched to CELL B from CELLA, the possibility of crossing late switching is larger.
The Va1 here and Va2 can be set by OAM backstage, also can be in network operation process by CELL A, according to self statistics, be set.
In like manner, for CELL B:
When Mn > Ms+O2+Hys, switch, establish O2+Hys=Vb
Vb1 represents that probability or number of times that terminal occurs to switch too early in CELL B surpass threshold value, and when Vb < Vb1, also when UE is more easily switched to CELLB from CELL A, the possibility of too early switching is larger.Vb2 represents that probability or number of times that terminal occurred to switch in CELL B evening surpass threshold value, and when Vb > Vb2, also, when UE is more difficult while being switched to CELL B from CELLA, the possibility of crossing late switching is larger.
The Vb1 here and Vb2 can be set by OAM backstage, also can be in network operation process by CELL A, according to self statistics, be set.
In simple mobility is optimized, with A3 event for example, also when Va, Vb > 0, just can switch, in the ideal case, CELL A and CELL B too early/to cross late boundary line be symmetrical, but, because calculate respectively Liang Ge community, therefore, the difference of Va1, Va2, Vb1, Vb2 there will be some deviations unavoidably.Fig. 5 has comprehensively provided too early/excessively late schematic diagram that switches of CELLA and CELL B.As shown in Figure 5, the adjusting range that Va allows is Va1 < Va < Va2, and the adjusting range that Vb allows is Vb1 < Vb < Vb2.
When introducing load balancing optimization, because the switching that load balancing triggers be take load difference as Main Basis, therefore, there is situation about switching in the situation of Mn-Ms < 0.In load balancing optimization and mobility optimization and deposit in the situation that, carrying out load balancing optimization while causing that handoff parameter is optimized, also to avoid UE after being switched to balanced community, to introduce too early/cross the situation of late RLF and pingpang handoff simultaneously.
In like manner, as shown in Figure 6, under the prerequisite existing in load balancing, CELL A and CELLB carry out too early in this locality/cross switching evening after statistics and judgement, and the condition of switching too early can change.Similarly, the adjusting range that Va allows is Va1 < Va < Va2, and the adjusting range that Vb allows is Vb1 < Vb < Vb2.Now, Va1 and Vb1 are likely negative value.Wherein, in Fig. 5 and Fig. 6, region 1 represents the CELL B too early region that switches, and region 2 represents the region that CELL B switched evening, and region 3 represents the CELL A too early region that switches, and region 4 represents the region that CELLA switched evening.
Meanwhile, in order to prevent that the situation of pingpang handoff from occurring, and also needs to meet the following conditions:
Va > 0 and Vb > 0 (as shown in Figure 7)
Or Va <=0 and Vb > 0 and | Vb| > | Va| (as shown in Figure 8)
Or Vb <=0 and Va > 0 and | Va| > | Vb| (as shown in Figure 9)
Wherein, in Fig. 7 to Fig. 9, region 1 represents that UE is switched to the region of CELLA from CELL B, and region 2 represents that UE is switched to the region of CELL B from CELL A, and region 3 is boundary belt, and UE resides in former Serving cell in this region.
In order to prevent signal jitter, arrange protection be spaced apart Wa and Wb, wherein, Wa, Wb be on the occasion of.Here Wa, Wb can be set by OAM backstage.Above formula is transformed to:
Va > Wa and Vb > Wb
Or Va <=-Wa and Vb > Wb and | Vb| > | Va|
Or Vb <=-Wb and Va > Wa and | Va| > | Vb|
By above description, can find out; suppose to adjust the handoff parameter of CELL A; for CELL A; as can be seen from Figure 10; the adjusting range of the handoff parameter of CELL A is switched too early at Ra, Ra switched between evening; and will meet between CELLA and CELL B and keep certain switch protecting band (region 6), also, the region 5 in Figure 10 is that handoff parameter allows the scope of adjusting.Meanwhile, due to the existence of handoff parameter negotiation mechanism, the handoff parameter of CELL B also can carry out corresponding adjustment in order to meet the adjustment demand of CELL A.
With CELL A load difference, higher than CELL B load difference, meeting load balancing optimization condition is example, and the handoff parameter of CELL A and CELL B need to meet the following conditions:
Va1 < Va < Va2 and Va > Wa and Vb > Wb
Or Va1 < Va < Va2 and Va <=-Wa and Vb > Wb and | Vb| > | Va|
Or Va1 < Va < Va2 and Vb <=-Wb and Va > Wa and | Va| > | Vb|
Below in conjunction with embodiment, present invention is described.
Embodiment mono-
Suppose CELL A and CELL B adjacent area each other; suppose that the handoff boundary of current C ELL A and CELLB is respectively as right side dotted line and left-hand broken line in Figure 11, wherein, region 6 is switching guard interval; that is, the handoff boundary of CELL A and CELL B need to guarantee the minimum range at interval.If CELL A works as preload higher than the preload of working as of CELL B, and meets the condition of load balancing optimization, there are following two kinds of adjustment modes, that is, adjust the handoff boundary of CELLA or the handoff boundary of adjustment CELL B.
(1) adjust the handoff boundary of CELL A:
Due to CELLA when preload too high, therefore, the object of adjustment is to allow the UE of the edge zone in CELL A and CELL B can more easily be switched to CELLB.Therefore, by the adjustment of turning left of the right side dotted line in Figure 11, that is, the handoff boundary of CELL A is dwindled, the permission adjusting range of the handoff boundary of CELL A is as shown in region in Figure 12 5.
(2) if adjust the handoff boundary of CELL B:
Due to CELL A when preload too high, therefore, the object of adjustment is to allow the UE in CELLA and CELLB edge zone can more easily be switched to CELLB.Therefore, by the adjustment of turning left of the left-hand broken line in Figure 11, that is, the handoff boundary of CELL B is expanded, the permission adjusting range of CELL B handoff boundary is as shown in the region 5 in Figure 13.
Embodiment bis-
Suppose CELL A and CELL B adjacent area each other, the handoff boundary of current C ELL A and CELL B is respectively as right side dotted line and left-hand broken line in Figure 14, and wherein, area 5 is switching guard interval, that is, left-hand broken line and right side dotted line need to guarantee the minimum range of being separated by.If CELL A works as preload higher than the preload of working as of CELL B, and meets the condition of load balancing optimization, there are following two kinds of adjustment modes: adjust CELLA handoff boundary or adjust CELLB handoff boundary.
(1) if adjust the handoff boundary of CELL A:
Due to CELL A when preload too high, therefore, the object of adjustment is to allow the UE in CELL A and CELL B edge zone can more easily be switched to CELL B.That is, the adjustment of turning left of the right side dotted line in Figure 14, dwindles the handoff boundary of CELL A, and the permission adjusting range of the handoff boundary of CELL A is as shown in region in Figure 15 5.
(2) if adjust the handoff boundary of CELL B:
Due to CELL A when preload too high, therefore, the object of adjustment is to allow the UE in CELL A and CELL B edge zone can more easily be switched to CELLB.That is, the left-hand broken line adjustment of turning left in Figure 14, expands the handoff boundary of CELL B, and the permission adjusting range of the handoff boundary of CELLB is as shown in region in Figure 16 5.
According to the embodiment of the present invention, also provide a kind of handoff parameter adjusting device.Figure 17 is the structured flowchart illustrating according to the handoff parameter adjusting device of the embodiment of the present invention.As shown in figure 17, this device comprises following structure: the first determining unit 1, the second determining unit 3, adjustment unit 5; And preferably, this device can also have handoff boundary adjustment unit 7.
With community CELL A particularly, the first determining unit 1 is for determining the switching of community and cross earlier and switching lately, and for example, Ra in Fig. 4 is too early and Ra is excessively late; The second determining unit 3 is for determining the handoff boundary of community, for example, and shown in the dotted line in Figure 11 to Figure 16; Adjustment unit 5, is connected to the first determining unit 1 and the second determining unit 3, for based on switching earlier, switching late, to switch Liang Ge community handoff boundary separately, carries out handoff parameter adjustment.Similar with above-mentioned embodiment of the method; preferably; the handoff parameter adjustment here comprises: make handoff parameter adjusting range between the switching of the mobility optimization of the first community cross earlier and switched late between, and make to have switch protecting region between the first community and the second community.
Preferably, by carrying out following one of arrange, make to exist between the first community and the second community switch protecting region:
Va > Wa and Vb > Wb;
Va≤-Wa and Vb > Wb, and | Vb| > | Va|;
Vb≤-Wb and Va > Wa, and | Va| > | Vb|;
Wherein, Va is the handoff parameter of the first community, and Wa is the switching guard interval of the first community, and Vb is the handoff parameter of the second community, and Wb is the switching guard interval of the second community.
Above-mentioned handoff boundary adjustment unit 7 is preferably connected to the second determining unit 3 and/or adjustment unit 5, be used for according to the preload of working as of Liang Ge community, handoff boundary to community is adjusted, for example, if the first community when preload is higher than the preload of work as of the second community, dwindle the handoff boundary of the first community or the handoff boundary of expansion the second community.Specifically can understand with reference to above-mentioned Figure 11 to Figure 16.
Above-mentioned at least one technical scheme providing by the embodiment of the present invention, by the analysis to mobility handoff parameter adjusting range, and the relation that conditions each other of minizone handoff parameter, the handoff parameter adjusting range causing for load balancing optimization retrains, make the handoff parameter adjustment that load balancing optimization causes can not affect minizone mobility effect, thereby make network self-organization reach optimum, improve network performance and QoS of customer.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a handoff parameter adjusting method, is characterized in that,
For the handoff parameter adjustment being caused by the load balancing handoff parameter causing in mobility optimization that is tied, adjust;
Wherein, for the handoff parameter adjustment between the first community and the second community causing due to load balancing; the handoff parameter of described the first community is set to meet following condition: between the switching of the mobility optimization of described the first community cross earlier and switched late between, and make to have switch protecting region between described the first community and described the second community.
2. method according to claim 1, is characterized in that, by carrying out following one of arrange, makes to exist between described the first community and described the second community described switch protecting region:
Va>Wa and Vb>Wb;
Va≤-Wa and Vb>Wb, and | Vb|>|Va|;
Vb≤-Wb and Va>Wa, and | Va|>|Vb|;
Wherein, Va is the handoff parameter of described the first community, and Wa is the switching guard interval of described the first community, and Vb is the handoff parameter of described the second community, and Wb is the switching guard interval of described the second community.
3. method according to claim 1 and 2; it is characterized in that; described switch protecting region is the region between the handoff boundary of described the first community and the handoff boundary of described the second community, and in described switch protecting region, subscriber equipment resides in former Serving cell.
4. method according to claim 3, is characterized in that, if described the first community when preload is higher than the preload of working as of described the second community, dwindle the handoff boundary of described the first community or expand the handoff boundary of described the second community.
5. a handoff parameter adjusting device, is characterized in that, comprising:
The first determining unit, crosses earlier and switched late for the switching of definite community;
The second determining unit, for determining the handoff boundary of community;
Adjustment unit, for crossing based on described switching earlier, describedly switched late, to switch Liang Ge community handoff boundary separately, carries out handoff parameter adjustment;
Wherein, described handoff parameter adjustment comprises: make handoff parameter adjusting range between the switching of the mobility optimization of the first community cross earlier and switched late between, and make to have switch protecting region between described the first community and the second community.
6. device according to claim 5, is characterized in that, by carrying out following one of arrange, makes to exist between described the first community and described the second community described switch protecting region:
Va>Wa and Vb>Wb;
Va≤-Wa and Vb>Wb, and | Vb|>|Va|;
Vb≤-Wb and Va>Wa, and | Va|>|Vb|;
Wherein, Va is the handoff parameter of described the first community, and Wa is the switching guard interval of described the first community, and Vb is the handoff parameter of described the second community, and Wb is the switching guard interval of described the second community.
7. device according to claim 5, also comprises:
Handoff boundary adjustment unit, be used for according to the preload of working as of described Liang Ge community, handoff boundary to community is adjusted, if described the first community when preload is higher than the preload of working as of described the second community, dwindle the handoff boundary of described the first community or expand the handoff boundary of described the second community.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102638831B (en) * | 2011-02-12 | 2014-12-10 | 中兴通讯股份有限公司 | Handover parameter optimization method and system |
| KR101555614B1 (en) * | 2011-08-09 | 2015-09-24 | 노키아 솔루션스 앤드 네트웍스 오와이 | Mobility robustness optimization with an extended key performance indicator message |
| CN102625365B (en) * | 2012-03-20 | 2014-07-30 | 华为技术有限公司 | Method for mobility robustness optimization (MRO) and mobility load balancing (MLB) and base station |
| EP2954725A4 (en) * | 2013-02-06 | 2016-09-21 | Ericsson Telefon Ab L M | An enhanced solution for handover |
| CN104219707B (en) * | 2013-05-29 | 2017-11-03 | 中国移动通信集团设计院有限公司 | A kind of methods, devices and systems for obtaining handover between cells parameter |
| CN104811967B (en) * | 2014-01-27 | 2019-08-30 | 中兴通讯股份有限公司 | Mobile robustness optimization method, base station and terminal under a kind of more covering scenes |
| CN107690150A (en) * | 2016-08-05 | 2018-02-13 | 中兴通讯股份有限公司 | With reference to cell quality and the mobile robustness optimization method and device of switch failure |
| CN106572511A (en) * | 2016-11-15 | 2017-04-19 | 中国联合网络通信集团有限公司 | Cell switching or reselection method in heterogeneous network and apparatus thereof |
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