CN102170673B - Method, system and device for adjusting switching parameter - Google Patents
Method, system and device for adjusting switching parameter Download PDFInfo
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Abstract
The embodiment of the invention relates to a wireless communication technology, in particular to a method, system and device for adjusting a switching parameter, which are used for solving the problem of reduction of stability and switching performance of a system due to the ping-pong switching condition caused by slowly switching or switching to an error cell when the switching parameter is optimized existing in the prior art. Meanwhile, in the method, system and device for adjusting the switching parameter, provided by the embodiment of the invention, ping-pong switching can be eliminated by optimizing the switching parameter when the ping-pong switching is generated. The method disclosed by the embodiment of the invention comprises the following steps of: confirming whether the user terminal in a first cell generates error switching or not and adjusting a first switching trigger threshold value and/or second switching trigger threshold value under the condition that the sum of the first switching trigger threshold value and the second switching trigger threshold value is larger than zero when the user terminal generates error switching in the first cell. By adopting the method of the embodiment of the invention, the stability and switching performance of the system can be improved.
Description
Technical field
The present invention relates to wireless communication technology, particularly a kind of mthods, systems and devices of adjusting handoff parameter.
Background technology
In mobile communications network, the call drop caused because switching time is improper can bring very poor experience to the user, and the user generally can think the carrier network poor signal, and this is that mobile operator is unwilling to see.Switching improperly generally includes following three kinds of situations:
1, user terminal is not switched to wireless signal community preferably in time, and original Serving cell signal constantly worsens until call drop, and this situation is called ' crossing switching late ', means that switching should more early carry out, and has been delayed but switch.
2, user terminal is switched to Target cell from cell-of-origin, but the Target cell signal is also unstable, after the result switching, Radio Link Failure occurs soon, subsequently user terminal selecting one Ge Xinde community rebuild wireless connections, this situation is called ' being switched to wrong cell ', the target selection that means switching is improper, and rebuild that community connected and be only a suitable target, and the original target of selecting improper.
3, user terminal Cong Yige community is switched to another community, has only stopped very short a period of time, then switches go back to again original community.Situation about switching back and forth between user terminal Zai Liangge community, be called ' pingpang handoff '.
Whether, in current mobile communication system, determine to switch based on the defined event of standard and carry out switch decision, be that example describes with LTE (Long Term Evolution, Long Term Evolution) and 3G system.
According to 3GPP (3rd Generation Partnership Project, 3G (Third Generation) Moblie standardization body) agreement, in the LTE system, be used to the trigger condition of the A3 measurement event that triggers switching be:
M
n+ Of
n+ Oc
n-Hys>Ms+Of
s+ Oc
s+ Off........... formula 1.
Wherein, M
nIt is the wireless signal measurement result of adjacent cell n; Ms is the measurement result of Serving cell s; Hys is the A3 event lagged value of Serving cell s; Oc
nIt is the cell specific offset value of adjacent cell n; Oc
sIt is the cell specific offset value of Serving cell s; Of
nIt is the frequency particular offset values of adjacent cell n; Of
sIt is the specific deviant of Serving cell s frequency; Off is the deviant of A3 event.
According to the 3GPP agreement, in 3G TDD (Time division duplex, time division duplex) system, for the same trigger condition of the 1G measurement event of switching frequently be:
10LogM
i+ O
i-H
1g>10LogM
Previous_best+ O
Previous_best... ... .. formula 2.
Wherein, Mprevious_best is P-CCPCH (P-CCPCH:PrimaryCommon Control Physical Channel Primary Common Control Physical Channel) RSCP (the RSCP:Received Signal Code Power received signal code power) intensity of former optimum subdistrict, and unit is mW; Oprevious_best is the community individual character deviant of former optimum subdistrict; Mi is the P-CCPCH RSCP intensity of the cell i of evaluation, and unit is mW; Oi is the community individual character deviant of the cell i of evaluation; H1g is the lagged value of 1g event.
By optimizing handoff parameter, avoid at present the generation of " after switching late ", " being switched to wrong cell " and " pingpang handoff " three kinds of switch instances, but these switching problems are to be caused by different handoff parameters, thus solved switch late or be switched to the wrong cell problem in there will be pingpang handoff.
In sum, at present when optimizing handoff parameter, can switch late or be switched to the situation that pingpang handoff appears in wrong cell because avoiding, thereby reduced stability and the performance of handoffs of system.
Summary of the invention
The embodiment of the present invention provides a kind of mthods, systems and devices of adjusting handoff parameter, in order to solve in prior art, exist when optimizing handoff parameter, there will be and avoided switching late or be switched to wrong cell and the situation of pingpang handoff occurs, thereby reduce the stability of system and the problem of performance of handoffs.A kind of mthods, systems and devices of adjusting handoff parameter that the while embodiment of the present invention provides can also, when pingpang handoff occurring, by optimizing handoff parameter, be eliminated pingpang handoff.
A kind of method of adjusting handoff parameter that the embodiment of the present invention provides, the method comprises:
Determine the switching that whether makes a mistake of user terminal in the first community; And
When the user terminal in determining the first community makes a mistake switching, according to the first handover trigger threshold value and the second handover trigger threshold value sum, be greater than zero condition, the first handover trigger threshold value and/or the second handover trigger threshold value are adjusted, wherein, the first handover trigger threshold value is that user terminal is switched to the handover trigger threshold value of the second community from the first community; The second handover trigger threshold value is that user terminal is switched to the handover trigger threshold value of the first community from the second community; The second community is the Target cell of user terminal when late switching or user terminal occurring being switched to wrong cell.
A kind of network measurement equipment that the embodiment of the present invention provides, this network equipment comprises:
Judge module, for the switching that whether makes a mistake of the user terminal of determining the first community;
Adjusting module, while for the user terminal determining the first community, making a mistake switching, be greater than zero condition according to the first handover trigger threshold value and the second handover trigger threshold value sum, and the first handover trigger threshold value and/or the second handover trigger threshold value are adjusted;
Wherein, the first handover trigger threshold value is that user terminal is switched to the handover trigger threshold value of the second community from the first community; The second handover trigger threshold value is that user terminal is switched to the handover trigger threshold value of the first community from the second community; The second community is the Target cell of user terminal when late switching or user terminal occurring being switched to wrong cell.
When embodiment of the present invention user terminal in determining the first community makes a mistake switching, be greater than zero condition according to the first handover trigger threshold value and the second handover trigger threshold value sum, the first handover trigger threshold value and/or the second handover trigger threshold value are adjusted.In mistake switching, be to switch late or while being switched to wrong cell, because the first handover trigger threshold value after adjusting and the second handover trigger threshold value sum are greater than zero, thereby avoid the situation of pingpang handoff occurring having solved when switching late or being switched to wrong cell, obtain stability and performance of handoffs thereby improved system; Further, improved user's experience.When mistake switching is pingpang handoff, because the first handover trigger threshold value after adjusting and the second handover trigger threshold value sum are greater than zero, thereby can, when pingpang handoff occurring, by optimizing handoff parameter, eliminate pingpang handoff.
The accompanying drawing explanation
Fig. 1 Wei Liangge community switching band schematic diagram;
Fig. 2 is the structural representation of embodiment of the present invention network equipment;
Fig. 3 is the method flow schematic diagram that the embodiment of the present invention is adjusted handoff parameter.
Embodiment
When embodiment of the present invention user terminal in determining the first community makes a mistake switching, be greater than zero condition according to the first handover trigger threshold value and the second handover trigger threshold value sum, the first handover trigger threshold value and/or the second handover trigger threshold value are adjusted.In mistake switching, be to switch late or while being switched to wrong cell, because the first handover trigger threshold value after adjusting and the second handover trigger threshold value sum are greater than zero, thereby avoid the situation of pingpang handoff occurring having solved when switching late or being switched to wrong cell, obtain stability and performance of handoffs thereby improved system; Further, improved user's experience.When mistake switching is pingpang handoff, because the first handover trigger threshold value after adjusting and the second handover trigger threshold value sum are greater than zero, thereby can, when pingpang handoff occurring, by optimizing handoff parameter, eliminate pingpang handoff.
Wherein, the handover parameter values of mistake switching Shi Yin community arranges the switching of unreasonable generation, is switched to wrong cell and user terminal generation pingpang handoff (handover parameter values of Ji Yin community arranges the pingpang handoff of unreasonable generation) such as switching, user terminal late occur user terminal.
The embodiment of the present invention can be applied in GSM (Global System for MobileCommunications, global system for mobile communications), EDGE (Enhanced Data rates for GSM Evolution, the enhancing data transfer rate of GSM evolution) system, LTE (Long Term Evolution, Long Term Evolution) system and 3G TDD system (such as TD-SCDMA (Time Division Synchronized Code Division Multiple Access, TD SDMA) system, WCDMA system and CDMA2000 system).
It should be noted that, the embodiment of the present invention is not limited to said system, the applicable equally embodiment of the present invention of the system of other switchings that can make a mistake.
Below take LTE system and 3G TDD system describes as example, and other system and LTE system and 3G TDD system class seemingly, do not repeat them here.
Suppose that user terminal 1 is switched to community 2 from community, in the LTE system, formula 1, through conversion, can be expressed as:
Mn>Ms+Thresh
1,2... ... ... .. formula 3.
Wherein, Thresh
1,2=Hys
1+ Off
1+ Ocs
1+ Ofs
1-Oc
2-O
F2... ... ... .. formula 4.Thresh
1,2Shi Cong community 1 is to the threshold value of community 2 handover trigger, and unit is dB.
Suppose that user terminal 1 is switched to community 2 from community, in 3G TDD system, formula 1, through conversion, can be expressed as:
M
2>M
1+ Thresh
1,2... ... ... .. formula 5.
Wherein, Thresh
1,2=H
1g+ O
Previous_best-O
i... ... ... .. formula 6.
M
2=10Log M
iBe the signal strength signal intensity of adjacent area, unit is dBm; M
1=10Log M
Previous_bestBe the signal strength signal intensity of current service cell, unit is dBm; Thresh
1,2Shi Cong community 1 is to the threshold value of community 2 handover trigger, and unit is dB.
No matter from formula 3 and 5, can find out, be the LTE system, or the TD-SCDMA system, and the trigger condition of switching is all that neighboring area signal intensity is greater than deviant of current service cell signal strength signal intensity (this deviant can be on the occasion of, can be also negative value).
For a pair of community 1 and 2:
1 trigger condition that is switched to community 2 is M to user terminal from community
2>M
1+ Thresh
1,2
2 trigger conditions that are switched to community 1 are M to user terminal from community
1>M
2+ Thresh
2,1.
Be reflected in Fig. 1, A be user terminal from community 1 trigger point that is switched to community 2, B be user terminal from community 2 trigger points that are switched to community 1.
If handoff parameter arranges improper, will produce the handover trigger band overlapping (being Mixed Zone) of Liang Ge community, in this piece zone, user terminal can be from community 1 be switched to community 2, on the contrary also can, therefore cause pingpang handoff frequently.
For fear of pingpang handoff, need to meet Thresh1,2+Thresh2,1>0........... formula 7.
Namely make the A point be positioned at the right side that B is ordered.The situation that the handover triggering condition of both direction all meets, can not occur in the intersection of Zai Liangge community like this.
Below in conjunction with Figure of description, the embodiment of the present invention is described in further detail.
As shown in Figure 2, the network equipment of the embodiment of the present invention comprises: judge module 10 and adjusting module 20.
Adjusting module 20, while for the user terminal determining the first community, making a mistake switching, according to the first handover trigger threshold value and the second handover trigger threshold value sum, be greater than zero condition, the first handover trigger threshold value and/or the second handover trigger threshold value are adjusted.
Wherein, the first handover trigger threshold value is that user terminal is switched to the handover trigger threshold value of the second community from the first community; The second handover trigger threshold value is that user terminal is switched to the handover trigger threshold value of the first community from the second community; The second community is the Target cell of user terminal when late switching or user terminal occurring being switched to wrong cell.
According to the first handover trigger threshold value and the second handover trigger threshold value sum, be greater than zero condition, the first handover trigger threshold value and/or the second handover trigger threshold value are adjusted, require exactly whether to be greater than zero regardless of the first handover trigger threshold value before adjusting and the second handover trigger threshold value sum, after guaranteeing to adjust, the first handover trigger threshold value and the second handover trigger threshold value sum are greater than zero.
In specific implementation process, if user terminal is occurring unsuccessfully before handover trigger or in handoff procedure, then user terminal in another community that is different from former Serving cell (if RLF (Radio Link Failure occurs in handoff procedure, Radio Link Failure), this community refers to Target cell so) middle trial reconstruction wireless connections, can determine the switching that makes a mistake (switching late namely occurred).If user terminal occurs unsuccessfully after from the cell-of-origin successful switch to Target cell very soon, perhaps failure in handoff procedure, then user terminal is attempted a third party community (neither cell-of-origin, also non-Target cell) and is rebuild and connect, and can determine the switching that makes a mistake (namely being switched to wrong cell).Between terminal Zai Liangge community, switch back and forth frequently, check that the lagged value of two neighbor cells all arranges smallerly, and the signal strength differences of measurement report Zhong Liangge community is not very large, judgement is the improper pingpang handoff caused of lagged value.
In specific implementation process, if being applied in the handover parameter values of LTE system Zhong， community, the embodiment of the present invention comprises following parameters:
The cell specific offset value Ocn of cell specific offset value Ocs, the adjacent cell n of frequency particular offset values Ofs, the Serving cell s of deviant off, the Serving cell s of the A3 event of A3 event lagged value Hys, the Serving cell s of Serving cell s and the frequency particular offset values Ofn of adjacent cell n.
Due in specific implementation process, in the handover parameter values of community, some parameter value may be 0, during such as identical networking, the frequency particular offset values Ofn of the frequency particular offset values Ofs of the cell specific offset value Ocs of Serving cell s, Serving cell s and adjacent cell n equals 0, so in implementation process, can not consider these three handover parameter values.
Certainly, above-mentioned three parameter values are 0 just to give an example, and do not consider that specifically which parameter value can determine with different applied environments according to actual needs.
Accordingly, adjusting module 20 is also determined the first handover trigger threshold value at least one of the handover parameter values of the handover parameter values according to following the first community and the second community:
The deviant of the A3 event lagged value (Hysteresis) of the first community, the A3 event of the first community, the cell specific offset value of the first community (cell specific offset), the frequency particular offset values (frequency specific offset) of the first community, the cell specific offset value of the second community and the frequency particular offset values of the second community.
Concrete, adjusting module 20 is determined the first handover trigger threshold value according to formula 8:
Thresh
1,2=Hys
1+ Off
1+ Ocs
1+ Ofs
1-Oc
2-O
F2... ... ... .. formula 8.
Wherein, Thresh
1,2It is the first handover trigger threshold value; Hys
1It is the A3 event lagged value of the first community; Off
1It is the deviant of the A3 event of the first community; Ocs
1Cell specific offset value, the Ofs of the first community
1It is the frequency particular offset values of the first community; Oc
2It is the cell specific offset value of the second community; O
F2It is the frequency particular offset values of the second community.
If which parameter value does not need, do not consider, can in formula 8, reject corresponding value or table is 0 for corresponding value.
Accordingly, adjusting module 20 is also determined the second handover trigger threshold value at least one of the handover parameter values of the handover parameter values according to following the first community and the second community:
The frequency particular offset values of frequency particular offset values, the first cell specific offset value and first community of the deviant of the A3 event lagged value of the second community, the A3 event of the second community, the cell specific offset value of the second community, the second community.
Concrete, adjusting module 20 is determined the second handover trigger threshold value according to formula 9:
Thresh
2,1=Hys
2+ Off
2+ Oc
2+ Of
2-Oc
1-O
F1... ... ... .. formula 9.
Wherein, Thresh
2,1It is the second handover trigger threshold value; Hys
2It is the A3 event lagged value of the second community; Off
2It is the deviant of the A3 event of the second community; Oc
2Cell specific offset value, the Of of the second community
2It is the frequency particular offset values of the second community; Oc
1It is the first cell specific offset value; O
F1It is the frequency particular offset values of the first community.
If which parameter value does not need, do not consider, can in formula 9, reject corresponding value or table is 0 for corresponding value.
In specific implementation process, adjusting module 20 can be adjusted the first handover trigger threshold value and/or the second handover trigger threshold value.
Concrete, when needs are adjusted the first handover trigger threshold value, can adjust at least one handover parameter values of the handover parameter values for determining the first handover trigger threshold value;
A3 event lagged value such as the first community, the deviant of the A3 event of the first community, the cell specific offset value of the first community, the frequency particular offset values of the first community, in the frequency particular offset values of the cell specific offset value of the second community and the second community, 20 event of the A3 according to the first community lagged values of adjusting module, the deviant of the A3 event of the first community, the frequency particular offset values of the cell specific offset value of the first community and the second community is determined the first handover trigger threshold value, when adjusting also only to the A3 event lagged value of the first community, the deviant of the A3 event of the first community, at least one in the frequency particular offset values of the cell specific offset value of the first community and the second community adjusted.
When needs are adjusted the second handover trigger threshold value, can adjust at least one handover parameter values of the handover parameter values for determining described the second handover trigger threshold value.
A3 event lagged value such as the second community, the deviant of the A3 event of the second community, the cell specific offset value of the second community, the frequency particular offset values of the second community, in the frequency particular offset values of the cell specific offset value of the first community and the first community, 20 event of the A3 according to the second community lagged values of adjusting module, the deviant of the A3 event of the second community, the frequency particular offset values of the cell specific offset value of the second community and the first community is determined the second handover trigger threshold value, when adjusting also only to the A3 event lagged value of the second community, the deviant of the A3 event of the first community, at least one in the frequency particular offset values of the cell specific offset value of the first community and the second community adjusted.
Specifically can determine as required which handover trigger threshold value and which handoff parameter are adjusted.
In specific implementation process, if being applied in the handover parameter values of 3G TDD system Zhong， community, the embodiment of the present invention comprises following parameters:
The 1g event lagged value Hys of Serving cell, the individual character side-play amount O of adjacent cell and the individual character side-play amount O of Serving cell
Previous_best.
Because some parameter value in the handover parameter values in specific implementation process Zhong， community may be 0, so can not consider some handover parameter values in implementation process, the process in concrete process and LTE system is similar, does not repeat them here.
Accordingly, adjusting module 20 is also determined the first handover trigger threshold value at least one of the handover parameter values of the handover parameter values according to following the first community and the second community:
The community individual character deviant (cellindividual offset) of the 1g event lagged value (Hystersis) of the first community, the first community and the community individual character deviant of the second community;
Concrete, adjusting module 20 is determined the first handover trigger threshold value according to formula 10:
Thresh
1,2=H
1-1g+ O
1-previous_best-O
2... ... ... .. formula 10.
Wherein, Thresh
1,2It is the first handover trigger threshold value; H
1-1gIt is the 1g event lagged value of the first community; O
1-previous_bestIt is the community individual character deviant of the first community; O
2It is the community individual character deviant of the second community.
If which parameter value does not need, do not consider, can in formula 10, reject corresponding value or table is 0 for corresponding value.
Accordingly, adjusting module 20 is also determined the second handover trigger threshold value at least one of the handover parameter values of the handover parameter values according to following the first community and the second community:
The community individual character deviant of the 1g event lagged value of the second community, the community individual character deviant of the second community and the first community.
Concrete, adjusting module 20 is determined the second handover trigger threshold value according to formula 11:
Thresh
2,1=H
2-1g+ O
2-previous_best-O
1... ... ... .. formula 11.
Wherein, Thresh
2,1It is the second handover trigger threshold value; H
2-1gIt is the 1g event lagged value of the second community; O
2-previous_bestIt is the community individual character deviant of the second community; O
1It is the community individual character deviant of the first community.
If which parameter value does not need, do not consider, can in formula 11, reject corresponding value or table is 0 for corresponding value.
In specific implementation process, adjusting module 20 can be adjusted the first handover trigger threshold value and/or the second handover trigger threshold value.
Concrete, when needs are adjusted the first handover trigger threshold value, can adjust at least one handover parameter values of the handover parameter values for determining described the first handover trigger threshold value;
In community individual character deviant such as the community individual character deviant of the 1g event lagged value of the first community, the first community and the second community, the community individual character deviant of 20 individual character deviants of the community according to the first community of adjusting module and the second community is determined the first handover trigger threshold value, when adjusting, also only at least one in the community individual character deviant of the community individual character deviant of the first community and the second community is adjusted.
When needs are adjusted the second handover trigger threshold value, can adjust at least one handover parameter values of the handover parameter values for determining described the first handover trigger threshold value;
In community individual character deviant such as the community individual character deviant of the 1g event lagged value of the second community, the second community and the first community, the community individual character deviant of 20 individual character deviants of the community according to the second community of adjusting module and the first community is determined the second handover trigger threshold value, when adjusting, also only at least one in the community individual character deviant of the community individual character deviant of the second community and the first community is adjusted.
Specifically can determine as required which handover trigger threshold value and which handoff parameter are adjusted.
Wherein, the network equipment of the embodiment of the present invention can further include: acquisition module 30.
Concrete, acquisition module 30 can obtain the handover parameter values of the second community when neighboring BS relationship is set up; After also can changing in the handover parameter values of the second community, receive from the handover parameter values after the variation of the second community.
After acquisition module 30 also can change in the handover parameter values of self, the handover parameter values after changing is sent to adjacent area.
If the embodiment of the present invention is applied in the LTE system, the network equipment of the embodiment of the present invention is base station; Further, if the first community and the second community belong to different base stations, acquisition module 30 can be by obtaining the handover parameter values of the second community the base station of X2 interface under the second community; Or obtain the handover parameter values of the second community by OAM (Operations Administration and Maintenance, Operations, Administration and Maintenance) entity.
If the embodiment of the present invention is applied in 3G TDD system, the network equipment of the embodiment of the present invention is RNC (Radio Network Controller, radio network controller); Further, if the first community and the second community belong to different base stations, and two base stations connect different RNC, and acquisition module 30 obtains the handover parameter values of the second community can the RNC that the base station under the second community connects by the Iur interface; Or by the OAM entity, obtain the handover parameter values of the second community.
As shown in Figure 3, the method for embodiment of the present invention adjustment handoff parameter comprises the following steps:
When step 302, the user terminal in determining the first community make a mistake switching, be greater than zero condition according to the first handover trigger threshold value and the second handover trigger threshold value sum, the first handover trigger threshold value and/or the second handover trigger threshold value are adjusted;
Wherein, the first handover trigger threshold value is that user terminal is switched to the handover trigger threshold value of the second community from the first community; The second handover trigger threshold value is that user terminal is switched to the handover trigger threshold value of the first community from the second community; The second community is the Target cell of user terminal when late switching or user terminal occurring being switched to wrong cell.
According to the first handover trigger threshold value and the second handover trigger threshold value sum, be greater than zero condition, the first handover trigger threshold value and/or the second handover trigger threshold value are adjusted, require exactly whether to be greater than zero regardless of the first handover trigger threshold value before adjusting and the second handover trigger threshold value sum, after guaranteeing to adjust, the first handover trigger threshold value and the second handover trigger threshold value sum are greater than zero.
In specific implementation process, if being applied in the handover parameter values of LTE system Zhong， community, the embodiment of the present invention comprises following parameters:
The cell specific offset value Ocn of cell specific offset value Ocs, the adjacent cell n of frequency particular offset values Ofs, the Serving cell s of deviant off, the Serving cell s of the A3 event of A3 event lagged value Hys, the Serving cell s of Serving cell s and the frequency particular offset values Ofn of adjacent cell n.
Due in specific implementation process, in the handover parameter values of community, some parameter value may be 0, during such as identical networking, the frequency particular offset values Ofn of the frequency particular offset values Ofs of the cell specific offset value Ocs of Serving cell s, Serving cell s and adjacent cell n equals 0, so in implementation process, can not consider these three handover parameter values.
Certainly, above-mentioned three parameter values are 0 just to give an example, and do not consider that specifically which parameter value can determine with different applied environments according to actual needs.
Accordingly, according at least one in the handover parameter values of the handover parameter values of following the first community and the second community, determine the first handover trigger threshold value:
The frequency particular offset values of the deviant of the A3 event lagged value of the first community, the A3 event of the first community, the cell specific offset value of the first community, the first community, the cell specific offset value of the second community and the frequency particular offset values of the second community.
Concrete, can determine the first handover trigger threshold value according to formula 8.
Accordingly, according at least one in the handover parameter values of the handover parameter values of following the first community and the second community, determine the second handover trigger threshold value:
The frequency particular offset values of frequency particular offset values, the first cell specific offset value and first community of the deviant of the A3 event lagged value of the second community, the A3 event of the second community, the cell specific offset value of the second community, the second community.
Concrete, according to formula 9, determine the second handover trigger threshold value.
In specific implementation process, can adjust the first handover trigger threshold value and/or the second handover trigger threshold value in step 302.
Concrete, when needs are adjusted the first handover trigger threshold value, can adjust at least one handover parameter values of the handover parameter values for determining the first handover trigger threshold value;
A3 event lagged value such as the first community, the deviant of the A3 event of the first community, the cell specific offset value of the first community, the frequency particular offset values of the first community, in the frequency particular offset values of the cell specific offset value of the second community and the second community, only according to the A3 event lagged value of the first community, the deviant of the A3 event of the first community, the frequency particular offset values of the cell specific offset value of the first community and the second community is determined the first handover trigger threshold value, when adjusting also only to the A3 event lagged value of the first community, the deviant of the A3 event of the first community, at least one in the frequency particular offset values of the cell specific offset value of the first community and the second community adjusted.
When needs are adjusted the second handover trigger threshold value, can adjust at least one handover parameter values of the handover parameter values for determining described the second handover trigger threshold value.
A3 event lagged value such as the second community, the deviant of the A3 event of the second community, the cell specific offset value of the second community, the frequency particular offset values of the second community, in the frequency particular offset values of the cell specific offset value of the first community and the first community, only according to the A3 event lagged value of the second community, the deviant of the A3 event of the second community, the frequency particular offset values of the cell specific offset value of the second community and the first community is determined the second handover trigger threshold value, when adjusting also only to the A3 event lagged value of the second community, the deviant of the A3 event of the first community, at least one in the frequency particular offset values of the cell specific offset value of the first community and the second community adjusted.Specifically can determine as required which handover trigger threshold value and which handoff parameter are adjusted.
In specific implementation process, if being applied in the handover parameter values of 3G TDD system Zhong， community, the embodiment of the present invention comprises following parameters:
The 1g event lagged value Hys of Serving cell, the individual character side-play amount O of adjacent cell and the individual character side-play amount O of Serving cell
Previous_best.
Because some parameter value in the handover parameter values in specific implementation process Zhong， community may be 0, so can not consider some handover parameter values in implementation process, the process in concrete process and LTE system is similar, does not repeat them here.
Accordingly, according at least one in the handover parameter values of the handover parameter values of following the first community and the second community, determine the first handover trigger threshold value:
The community individual character deviant of the 1g event lagged value of the first community, the community individual character deviant of the first community and the second community;
Concrete, according to formula 10, determine the first handover trigger threshold value.
Accordingly, according at least one in the handover parameter values of the handover parameter values of following the first community and the second community, determine the second handover trigger threshold value:
The community individual character deviant of the 1g event lagged value of the second community, the community individual character deviant of the second community and the first community.
Concrete, according to formula 11, determine the second handover trigger threshold value.
In specific implementation process, can adjust the first handover trigger threshold value and/or the second handover trigger threshold value in step 302.
Concrete, when needs are adjusted the first handover trigger threshold value, can adjust at least one handover parameter values of the handover parameter values for determining described the first handover trigger threshold value;
In community individual character deviant such as the community individual character deviant of the 1g event lagged value of the first community, the first community and the second community, only according to the community individual character deviant of the first community and the community individual character deviant of the second community, determine the first handover trigger threshold value, when adjusting, also only at least one in the community individual character deviant of the community individual character deviant of the first community and the second community adjusted.
When needs are adjusted the second handover trigger threshold value, can adjust at least one handover parameter values of the handover parameter values for determining described the first handover trigger threshold value;
In community individual character deviant such as the community individual character deviant of the 1g event lagged value of the second community, the second community and the first community, only according to the community individual character deviant of the second community and the community individual character deviant of the first community, determine the second handover trigger threshold value, when adjusting, also only at least one in the community individual character deviant of the community individual character deviant of the second community and the first community adjusted.
Specifically can determine as required which handover trigger threshold value and which handoff parameter are adjusted.
Wherein, before step 301, can further include:
Concrete, in step 300, the first community can obtain the handover parameter values of the second community when neighboring BS relationship is set up; After also can changing in the handover parameter values of the second community, receive from the handover parameter values after the variation of the second community.
After in step 300, also can changing in the handover parameter values of self, the handover parameter values after changing is sent to adjacent area.
If the embodiment of the present invention is applied in the LTE system, the executive agent of the embodiment of the present invention is base station; Further, if the first community and the second community belong to different base stations, can be by the base station of X2 interface under the second community, obtaining the handover parameter values of the second community in step 300; Or by the OAM entity, obtain the handover parameter values of the second community.
If the embodiment of the present invention is applied in 3G TDD system, the executive agent of the embodiment of the present invention is RNC; Further, if the first community and the second community belong to different base stations, and two base stations connect different RNC, obtain the handover parameter values of the second community can the RNC that the base station under the second community connects by the Iur interface in step 300; Or by the OAM entity, obtain the handover parameter values of the second community.
The present invention will be described below to enumerate several embodiment.
Embodiment mono-, LTE network detected the A3 event lagged value Hys of switching ，Dui community late and were optimized:
1, user terminal resides in the LTE system, is in connection status.
2, Radio Link Failure occurs at LTE community A in user terminal, and user terminal carries out connection reconstruction in the B of LTE community subsequently.
3, the LTE base station detects this situation, and the judgement be community A after switching late.
4, the LTE base station is adjusted the handoff parameter of community A, reduces lagged value Hys.
Suppose that the LTE network is identical networking, Oc
s=Of
s=Of
2=0 ，Ze Cong community A is switched to the activation threshold value Thresh1 of community B, 2=Hys
1+ Off
1-Oc
2, along with Hys
1Reduce Thresh
1,2Also diminish.For fear of ' pingpang handoff ', need Hys
1>Oc
2-Off
1+ Oc
1-Off
2-Hys
2, this value is exactly (in the situation that other parameter remains unchanged) Hys
1The adjustable lower limit of parameter, Hys
1Can not be worth lower than this.
If base station A does not know the handoff parameter configuration of community B, need with base station, B place, community by X2 interface or OAM interface exchange handoff parameter separately.
Embodiment bis-, LTE network detected the A3 event offset amount offset of switching ，Dui community late and were optimized:
1, user terminal resides in the LTE system, is in connection status.
2, Radio Link Failure occurs at LTE community A in user terminal, and user terminal carries out connection reconstruction in the B of LTE community subsequently.
3, the LTE base station detects this situation, and the judgement be community A after switching late.
4, the LTE base station is adjusted the handoff parameter of community A, reduces A3 event offset amount off.
Suppose that the LTE network is identical networking, the frequency particular offset Of1 of Serving cell and cell specific offset amount Oc1 are 0, and the frequency particular offset Of2 of adjacent area is also 0, i.e. Oc1=Of1=Of2=0.Ze Cong community A is switched to the activation threshold value Thresh of community B
1,2=Hys
1+ Off
1-Oc
2, along with Off
1Reduce Thresh
1,2Also diminish.For fear of ' pingpang handoff ', need Off
1>Oc
2-Hys
1+ Oc
1-Off
2-Hys
2, this value is exactly (in the situation that other parameter remains unchanged) A3 event offset amount Off
1The adjustable lower limit of parameter, Off
1Can not be worth lower than this.
If the handoff parameter configuration of community B is not known in base station, need with base station, B place, community by X2 interface or OAM interface exchange handoff parameter separately.
Embodiment tri-, LTE network detect and are switched to wrong cell, and Ocn is optimized to cell specific offset value.
1, user terminal resides in the LTE system, is in connection status.
2, user terminal is switched to community B from LTE community A, and Radio Link Failure occurs very soon, and user terminal carries out connection reconstruction in the C of LTE community subsequently.
3, the LTE base station detects this situation, and judgement is that A existence in community is switched to wrong cell.
4, the LTE base station is adjusted the handoff parameter of community A, reduces the individual character skew Oc of adjacent area B
2, and the individual character skew Oc of increase adjacent area C
3.
Suppose that the LTE network is identical networking, Ocs=Ofs=Of
2=Of
3=0 ，Ze Cong community A is switched to the activation threshold value Thresh of community C
1,3=Hys
1+ Off
1-Oc
3, along with Oc
3Increase Thresh
1,3To diminish.For fear of ' pingpang handoff ', need Oc
3<Hys
1+ Off
1+ Hys
3+ Off
3-Oc
1, this value is exactly (in the situation that other parameter remains unchanged) Oc
3The adjustable upper limit of parameter, Oc
3Can not be worth higher than this.
If base station A does not know the handoff parameter configuration of community C, need with base station, C place, community by X2 interface or OAM interface exchange handoff parameter separately.
Embodiment tetra-, 3G TDD network detected the lagged value H of the 1G event of switching problem ，Dui community late
1gBe optimized.
1, user terminal resides in 3G TDD system, is in connection status.
2, Radio Link Failure occurs in user terminal Zai3G TDD community A, and UE does cell reselection subsequently, in Zai3G TDD community B, sends cell update (cell update) message and carries out cell update.Community A and B are under the base station of RNC 1 administration.
3,3G TDD RNC detects this situation, and the judgement be community A after switching late.
4, the handoff parameter of 3G TDDRNCDui community A is adjusted, and reduces lagged value H
1g.
From community A, be switched to the activation threshold value Thresh of community B
1,2=H
1g+ O
Previous_best-O
2, along with H
1gReduce Thresh
1,2Also diminish.For fear of ' pingpang handoff ', H
1g>(O
2+ O
1-O
Previous_best(A)-O
Previous_best(B))/2, O
Previous_best(A) be the individual character side-play amount in the A handover trigger threshold value of community, O
Previous_best(B) be the individual character side-play amount in the B handover trigger threshold value of community, above-mentioned value is exactly (in the situation that other parameter remains unchanged) H
1gThe adjustable lower limit of parameter, H
1gCan not be worth lower than this.
All under the base station of RNC management, RNC understands all handoff parameters configurations of Liang Ge community, does not therefore need between RNC to do mutual due to community A and B.
Embodiment five, 3G TDD network detect and are switched to wrong cell, and the individual character side-play amount O of adjacent area is optimized
1, user terminal resides in 3G TDD system, is in connection status.
2, user terminal Cong3G TDD community A is switched to community B, and Radio Link Failure occurs very soon, and user terminal is done cell reselection subsequently, in Zai3G TDD community C, sends cell update (cell update) message and carries out cell update.Community A and C are respectively under the base station of RNC 1 and RNC 2 administrations.
3,3G TDD RNC 1 detects this situation, and judgement is the wrong cell that is switched to of community A.
4, the handoff parameter of 1 couple of community A of 3G TDD RNC is adjusted, and reduces the individual character side-play amount O of adjacent area B
2, increase simultaneously the individual character side-play amount O of adjacent area C
3.
From community A, be switched to the activation threshold value Thresh of community C
1,3=H
1g+ O
Previous_best-O
3, along with O
3Increase Thresh
1,3Diminish.For fear of pingpang handoff, need O
3<2H
1g+ O
Previous_best(A)+O
Previous_best(C)-O
1, O
Previous_best(A) be the individual character side-play amount in the A handover trigger threshold value of community, O
Previous_best(C) be the individual character side-play amount in the C handover trigger threshold value of community, above-mentioned value is exactly (in the situation that other parameter remains unchanged) O
3The adjustable upper limit of parameter, O
3Can not be worth higher than this.
The base station that belongs to different RNC 1 management due to community A and C, 1 of RNC understands the handoff parameter configuration of community A, and does not understand the configuration of community C, therefore need between RNC to carry out mutual, by Iur interface or OAM interface exchange handoff parameter.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, implement software example or in conjunction with the form of the embodiment of software and hardware aspect fully.And the present invention can adopt the form that wherein includes the upper computer program of implementing of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code one or more.
The present invention describes with reference to flow chart and/or the block diagram of method, equipment (system) and computer program according to the embodiment of the present invention.Should understand can be in computer program instructions realization flow figure and/or block diagram each flow process and/or the flow process in square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce for realizing the device in the function of flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction be stored in this computer-readable memory produce the manufacture that comprises command device, this command device is realized the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make on computer or other programmable devices and to carry out the sequence of operations step to produce computer implemented processing, thereby in the instruction of carrying out on computer or other programmable devices, be provided for realizing the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art obtain the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
From above-described embodiment, finding out: the embodiment of the present invention is determined the switching that whether makes a mistake of the user terminal in the first community; And the user terminal in determining the first community is while making a mistake switching, according to the condition that the first handover trigger threshold value and the second handover trigger threshold value sum are greater than zero, the first handover trigger threshold value and/or the second handover trigger threshold value are adjusted; Wherein, the first handover trigger threshold value is that user terminal is switched to the handover trigger threshold value of the second community from the first community; The second handover trigger threshold value is that user terminal is switched to the handover trigger threshold value of the first community from the second community; The second community is the Target cell of user terminal when late switching or user terminal occurring being switched to wrong cell.
In mistake switching, be to switch late or while being switched to wrong cell, because the first handover trigger threshold value after adjusting and the second handover trigger threshold value sum are greater than zero, thereby avoid the situation of pingpang handoff occurring having solved when switching late or being switched to wrong cell, obtain stability and performance of handoffs thereby improved system; Further, improved user's experience.
When mistake switching is pingpang handoff, because the first handover trigger threshold value after adjusting and the second handover trigger threshold value sum are greater than zero, thereby can, when pingpang handoff occurring, by optimizing handoff parameter, eliminate pingpang handoff.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1. a method of adjusting handoff parameter, is characterized in that, the method comprises:
Determine the switching that whether makes a mistake of user terminal in the first community; And
When the user terminal in determining the first community makes a mistake switching, according to the first handover trigger threshold value and the second handover trigger threshold value sum, be greater than zero condition, the first handover trigger threshold value and/or the second handover trigger threshold value are adjusted, wherein, the first handover trigger threshold value is that user terminal is switched to the handover trigger threshold value of the second community from the first community; The second handover trigger threshold value is that user terminal is switched to the handover trigger threshold value of the first community from the second community; The second community is the Target cell of user terminal when late switching or user terminal occurring being switched to wrong cell;
Wherein, the first handover trigger threshold value is to determine according at least one handover parameter values of the handover parameter values that comprises the handover parameter values of one or more the first communities and one or more the second communities; The second handover trigger threshold value is to determine according at least one handover parameter values of the handover parameter values of the handover parameter values that comprises one or more the first communities and one or more the second communities.
2. the method for claim 1, is characterized in that, for the handover parameter values of the first community of determining the first handover trigger threshold value, comprises at least one of following parameters value:
The frequency particular offset values frequency specific offset of the deviant of the A3 event lagged value Hysteresis of the first community, the A3 event of the first community, the cell specific offset value cell specific offset of the first community and the first community;
The handover parameter values that is used for the second community of definite the first handover trigger threshold value comprises at least one of following parameters value: the frequency particular offset values of the cell specific offset value of the second community and the second community;
The handover parameter values that is used for the second community of definite the second handover trigger threshold value comprises at least one of following parameters value: the deviant of the A3 event lagged value of the second community, the A3 event of the second community, the cell specific offset value of the second community and the frequency particular offset values of the second community;
The handover parameter values that is used for the first community of definite the second handover trigger threshold value comprises at least one of following parameters value: the frequency particular offset values of the first cell specific offset value and the first community.
3. method as claimed in claim 2, is characterized in that, when needs are adjusted the first handover trigger threshold value, comprising:
At least one handover parameter values to the handover parameter values for determining described the first handover trigger threshold value is adjusted;
When needs are adjusted the second handover trigger threshold value, comprising:
At least one handover parameter values to the handover parameter values for determining described the second handover trigger threshold value is adjusted.
4. the method for claim 1, is characterized in that, for the handover parameter values of the first community of determining the first handover trigger threshold value, comprises at least one of following parameters value:
The community individual character deviant cell individual offset of the 1g event lagged value Hysteresis of the first community and the first community;
The handover parameter values that is used for the second community of definite the first handover trigger threshold value comprises: the community individual character deviant of the second community;
The handover parameter values that is used for the second community of definite the second handover trigger threshold value comprises at least one of following parameters value: the 1g event lagged value of the second community, the community individual character deviant of the second community;
The handover parameter values that is used for the first community of definite the second handover trigger threshold value comprises: the community individual character deviant of the first community.
5. method as claimed in claim 4, is characterized in that, when needs are adjusted the first handover trigger threshold value, comprising:
At least one handover parameter values to the handover parameter values for determining described the first handover trigger threshold value is adjusted;
When needs are adjusted the second handover trigger threshold value, comprising:
At least one handover parameter values to the handover parameter values for determining described the second handover trigger threshold value is adjusted.
6. the described method of claim as arbitrary as claim 2～5, is characterized in that, describedly also comprises before the first handover trigger threshold value and/or the second handover trigger threshold value are adjusted:
By X2 interface, obtain the handover parameter values of the second community; Or
By the Iur interface, obtain the handover parameter values of the second community; Or
By Operations, Administration and Maintenance OAM entity, obtain the handover parameter values of the second community.
7. a network equipment, is characterized in that, this network equipment comprises:
Judge module, for the switching that whether makes a mistake of the user terminal of determining the first community;
Adjusting module, while for the user terminal determining the first community, making a mistake switching, be greater than zero condition according to the first handover trigger threshold value and the second handover trigger threshold value sum, and the first handover trigger threshold value and/or the second handover trigger threshold value are adjusted;
Wherein, the first handover trigger threshold value is that user terminal is switched to the handover trigger threshold value of the second community from the first community; The second handover trigger threshold value is that user terminal is switched to the handover trigger threshold value of the first community from the second community; The second community is the Target cell of user terminal when late switching or user terminal occurring being switched to wrong cell;
Wherein, described adjusting module is also determined the first handover trigger threshold value at least one handover parameter values of the handover parameter values according to comprising the handover parameter values of one or more the first communities and one or more the second communities; And determine the second handover trigger threshold value according at least one handover parameter values of the handover parameter values of the handover parameter values that comprises one or more the first communities and one or more the second communities.
8. network equipment as claimed in claim 7, is characterized in that, for the handover parameter values of the first community of determining the first handover trigger threshold value, comprises at least one of following parameters value:
The frequency particular offset values frequency specific offset of the deviant of the A3 event lagged value Hysteresis of the first community, the A3 event of the first community, the cell specific offset value cell specific offset of the first community and the first community;
The handover parameter values that is used for the second community of definite the first handover trigger threshold value comprises at least one of following parameters value: the frequency particular offset values of the cell specific offset value of the second community and the second community;
The handover parameter values that is used for the second community of definite the second handover trigger threshold value comprises at least one of following parameters value:
The deviant of the A3 event lagged value of the second community, the A3 event of the second community, the cell specific offset value of the second community and the frequency particular offset values of the second community;
The handover parameter values that is used for the first community of definite the second handover trigger threshold value comprises at least one of following parameters value: the frequency particular offset values of the first cell specific offset value and the first community.
9. network equipment as claimed in claim 8, is characterized in that, described adjusting module specifically comprises:
When needs are adjusted the first handover trigger threshold value, at least one handover parameter values of the handover parameter values for determining described the first handover trigger threshold value is adjusted;
When needs are adjusted the second handover trigger threshold value, at least one handover parameter values of the handover parameter values for determining described the second handover trigger threshold value is adjusted.
10. network equipment as claimed in claim 7, is characterized in that, for the handover parameter values of the first community of determining the first handover trigger threshold value, comprises at least one of following parameters value:
The community individual character deviant cell individual offset of the 1g event lagged value Hysteresis of the first community and the first community;
The handover parameter values that is used for the second community of definite the first handover trigger threshold value comprises: the community individual character deviant of the second community;
The handover parameter values that is used for the second community of definite the second handover trigger threshold value comprises at least one of following parameters value: the community individual character deviant of the 1g event lagged value of the second community and the second community;
The handover parameter values that is used for the first community of definite the second handover trigger threshold value comprises: the community individual character deviant of the first community.
11. network equipment as claimed in claim 10, is characterized in that, described adjusting module specifically comprises:
When needs are adjusted the first handover trigger threshold value, at least one handover parameter values of the handover parameter values for determining described the first handover trigger threshold value is adjusted;
When needs are adjusted the second handover trigger threshold value, at least one handover parameter values of the handover parameter values for determining described the second handover trigger threshold value is adjusted.
12. the described network equipment of claim as arbitrary as claim 7～11, is characterized in that, described network equipment also comprises:
Acquisition module, for obtaining the handover parameter values of the second community by X2 interface; Or by the Iur interface, obtain the handover parameter values of the second community; Or obtain the handover parameter values of the second community by Operations, Administration and Maintenance OAM entity.
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| US9357456B2 (en) * | 2013-06-03 | 2016-05-31 | Telefonaktiebolaget Lm Ericsson (Publ) | Handover control method and apparatus for high speed mobility user equipment |
| CN104349416A (en) * | 2013-08-06 | 2015-02-11 | 中兴通讯股份有限公司 | Switching threshold processing method, device, base station, RNC (Radio Network Controller) and BSC (Base Station Controller) |
| WO2015066917A1 (en) * | 2013-11-11 | 2015-05-14 | 华为技术有限公司 | Method and device for enabling interoperability |
| CN106605428B (en) * | 2015-05-27 | 2020-01-17 | 华为技术有限公司 | Serving cell switching method and switching equipment |
| CN110831099B (en) * | 2018-08-08 | 2022-06-28 | 大唐移动通信设备有限公司 | Cell reselection method, device, terminal and network node |
| CN111586743B (en) * | 2019-02-15 | 2022-11-25 | 成都华为技术有限公司 | Wireless network communication method, network equipment and terminal equipment |
| CN112654072B (en) * | 2019-10-11 | 2022-06-24 | 维沃移动通信有限公司 | Cell residence method, equipment and system |
| WO2021226982A1 (en) * | 2020-05-15 | 2021-11-18 | Qualcomm Incorporated | Measurement report offset increase for avoiding ping-pong between long term evolution cells in non-stand-alone mode |
| WO2023216214A1 (en) * | 2022-05-13 | 2023-11-16 | Qualcomm Incorporated | Handover measurements associated with multiple threshold amounts |
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Effective date of registration: 20210528 Address after: 100085 1st floor, building 1, yard 5, Shangdi East Road, Haidian District, Beijing Patentee after: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |
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