CN102368861A - Idle mode UE (user equipment) cell reselection method in long term evolution (LTE) system - Google Patents
Idle mode UE (user equipment) cell reselection method in long term evolution (LTE) system Download PDFInfo
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Abstract
The invention discloses an idle mode UE (user equipment) cell reselection method in a long term evolution (LTE) system. In the method, idle mode UE acquires measurement resource limit information firstly, and when the idle mode UE judges self in an interference region, cells related to cell reselection are measured according to the measurement resource limit information; and finally cell reselection is carried out by the idle mode UE according to the measurement result. The invention provides a specific scheme for applying eICIC (enhanced Inter-cell Interference Coordination) in the cell reselection process of the idle mode UE.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly relate to idle pulley UE residence reselecting in a kind of Long Term Evolution LTE system.
Background technology
Heterogeneous network is the technology of a kind of remarkable elevator system throughput and network whole efficiency, is meant that low power nodes is placed in the macro base station coverage area by cloth, forms the heterogeneous system with the different node types that cover.(Low Power Node LPN) comprises little base station to low power nodes, millimicro cellular basestation (being often referred to Home eNodeB) etc.That is to say that the wireless coverage of different sizes such as grand (macro) sub-district, little (pico) sub-district, Home eNodeB (femto) sub-district, different capacity possibly arranged in zone simultaneously.These sub-districts power separately are different, and the interference that UE is produced in different positions is also different.In the heterogeneous network very part and parcel be exactly with each the internodal interference problem that covers; Especially because the macro base station transmitting power is a lot of greatly than LPN; Cause the interference of macro base station, and high-power terminal, macro base station edge is to the interference of LPN near to the descending reception of boundary user among the LPN.In addition, (Closed Subscriber Group, CSG) under the scene, the emission of Home eNodeB also can impact near macro base station user, thereby the interference between the control channel is more crucial problem in closed user group such as Home eNodeB.
The task of Inter-Cell Interference Coordination (ICIC) is exactly a managing radio resources, so that the interference of control sub-district.
In LTE Release 10, introduced Inter-Cell Interference Coordination (eICIC) method that strengthens.It is a kind of time domain scheme, and (Almost Blank Sub frames ABS) protects the resource that receives strong presence of intercell interference to use almost blank subframe.Wherein, the ABS subframe is meant the subframe that on some physical channels, reduces transmitted power (comprise and not sending) and taking in sail property.
In the prior art, also not about the eICIC scheme in the idle pulley.Promptly also not about how using the scheme of eICIC in the cell reselection process of idle pulley UE.
Summary of the invention
The invention provides idle pulley UE residence reselecting in a kind of Long Term Evolution LTE system, this method has provided about using the concrete scheme of eICIC in the cell reselection process of idle pulley UE.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses idle pulley UE residence reselecting in a kind of Long Term Evolution LTE system, this method comprises:
Idle pulley UE obtains the resource limit information of measuring;
Said idle pulley UE judges when self being in interference region, the sub-district relevant according to said measurement resource limit information measurement district reselecting;
Said idle pulley UE carries out district reselecting according to measurement result.
In said method, said idle pulley UE obtains measurement resource limit information and comprises:
Said measurement resource limit information is checked the Physical Cell Identifier PCI tabulation of answering for measuring resource-constrained model, and wherein, different measurement resource-constrained models is corresponding different is blank ABS subframe almost;
Idle pulley UE receives the measurement resource limit information of network side notice.
In said method, said idle pulley UE judges and self is in interference region and comprises:
Idle pulley UE is according to the threshold parameter of broadcasting among the measured value of Serving cell and adjacent sub-district and the system information block SIB is judged own residing zone.
In said method, under macrocell-Microcell scene, said idle pulley UE judges when self being in interference region, and idle pulley UE comprises according to the relevant sub-district of said measurement resource limit information measurement district reselecting:
When said idle pulley UE judged the border that self is in service Pico sub-district and get into the cell edge expansion CRE of Pico sub-district, idle pulley UE measured service Pico sub-district and adjacent Pico sub-district according to the ABS subframe of the Macro sub-district that covers service Pico sub-district;
When said idle pulley UE judges when self being in the Pico CRE access areas that is deployed in the Pico sub-district in the service Macro cell coverage area, idle pulley UE measures this Pico sub-district according to the AB S subframe of service Macro sub-district.
In said method, under grand Macro sub-district-Home eNodeB Femto cell scenario, said idle pulley UE judges when self being in interference region, and idle pulley UE comprises according to the relevant sub-district of said measurement resource limit information measurement district reselecting:
When said idle pulley UE judges when self being in the edge that is deployed in the Femto sub-district in the service Macro cell coverage area and getting into the home base station cells area of coverage, idle pulley UE measures service Macro sub-district according to the ABS subframe of this Femto sub-district.
In said method, under Macro sub-district-Pico sub-district-Femto cell scenario, said idle pulley UE judges when self being in interference region, and idle pulley UE comprises according to the relevant sub-district of said measurement resource limit information measurement district reselecting:
Judge the Pico CRE zone that self is in service Pico sub-district as said idle pulley UE; And should the zone and during the overlapped coverage of Macro sub-district and Femto sub-district, idle pulley UE measures service Pico sub-district and adjacent Pico sub-district according to the common subframe of Macro sub-district ABS and Femto sub-district ABS;
When judging, said idle pulley UE self is in the Pico sub-district Pico CRE access areas that is deployed in the service Macro cell coverage area; And should the zone and during the overlapped coverage of home base station cells, idle pulley UE comes measuring adjacent Pico sub-district according to the ABS of service Macro sub-district and the common subframe of home base station cells ABS.
In said method, said idle pulley UE carries out district reselecting according to measurement result and comprises:
Idle pulley UE is based on district reselecting R criterion, and under Macro-Pico and Macro-Pico-Femto scene, considers deviant, carries out district reselecting.
In said method, saidly consider that under Macro-Pico and Macro-Pico-Femto base station cell scene deviant comprises:
Increase a side-play amount on RSRP value that idle pulley UE measures or the idle pulley UE district reselecting evaluate parameter.
In said method, said idle pulley UE comprises according to the threshold parameter of broadcasting among the measured value of Serving cell and adjacent sub-district and the system information block SIB is judged own residing zone:
The RSRP value that measured value is measured for idle pulley UE;
Idle pulley UE judges that needed threshold parameter in own present position and deviant dispose in system information;
Idle pulley UE obtains from system information block after the deviant, is taken in the R criterion formulas, and the evaluation criteria of reusing district reselecting R criterion is judged the position of oneself.
By above-mentioned visible; This idle pulley UE of the present invention obtains the resource limit information of measuring; Judge when self being in interference region; The technical scheme of district reselecting is carried out according to measurement result in the sub-district relevant according to said measurement resource limit information measurement district reselecting, has provided about using the concrete scheme of eICIC in the cell reselection process of idle pulley UE.
Description of drawings
Fig. 1 is macrocell in the instance of the present invention-Microcell scene sketch map;
Fig. 2 is macrocell in the instance of the present invention-home base station cells scene sketch map;
Fig. 3 is macrocell-Microcell in the instance of the present invention-home base station cells scene sketch map;
Fig. 4 be use in the cell reselection process among the present invention eICIC flow chart.
Embodiment
Core concept of the present invention is: idle pulley UE obtains the resource limit information of measuring; Said idle pulley UE judges when self being in interference region, the sub-district relevant according to said measurement resource limit information measurement district reselecting; Said idle pulley UE carries out district reselecting according to measurement result.
In order to make the object of the invention, technical scheme and advantage clearer, describe the present invention below in conjunction with accompanying drawing and specific embodiment.
Specific embodiments is following:
UE eICIC associative operation separately in Macro, Pico and the Femto sub-district is discussed under the different scenes below.
In order to measure accurately, suppose that PUE (UE under the Pico sub-district) and MUE (UE under the Macro sub-district) should measure resource limit (subframe of sub-district ABS) in some area applications.The definition of ABS can be identical to the definition of the ABS under the connection mode with Rel-10.
Network disposes suitable threshold parameter in system information block SIB4, UE judges the position of oneself according to these parameters and own measurement result to Serving cell and adjacent sub-district.Such as for PUE, let PUE judge and lay oneself open to Pico center of housing estate, PicoCRE, still leave Pico CRE and get into the Macro sub-district.For MUE, judge to lay oneself open to sub-district, still near Pico CRE away from Pico.
1) Macro-Pico scene
Fig. 1 is macrocell in the instance of the present invention-Microcell scene sketch map.As shown in Figure 1: for PUE:
When a. idle pulley UE judges the border that self is in service Pico sub-district and gets into the cell edge expansion Pico CRE of Microcell; Just when PUE moves to the border (circle 1 among Fig. 1) of its service Microcell and gets into pico CRE (the diagonal line hatches zone among Fig. 1), PUE can use:
A.1.PUE measure service Pico sub-district and adjacent Pico sub-district according to the AB S subframe of the Macro sub-district that covers service Pico sub-district; Promptly measure resource limit (the ABS subframe in the macro sub-district) and measure oneself service Pico sub-district and adjacent Pico sub-district, and carry out the district reselecting assessment;
A.2. in carrying out the district reselecting evaluation process, PUE measure R SRP value (such as Qmeas) or PUE district reselecting evaluate parameter (such as Qoffset etc.) are gone up deviant of increase;
B. when PUE moves to pico CRE border (circle 2 among Fig. 1 based on district reselecting R criterion, is considered deviant), PUE possibly gravity treatment arrive the Macro sub-district, becomes a MUE.
For MUE:
A. (be equivalent to MUE and move to one during when said idle pulley UE judges when self being in the Pico CRE access areas that is deployed in the Pico sub-district in the service Macro cell coverage area near pico CRE regional; Horizontal line shadow region among Fig. 1), MUE is applied in this Pico sub-district of ABS subframe measurement of Macro sub-district.
B. when MUE moves to pico CRE border (circle 2 among Fig. 1), MUE can gravity treatment Macro sub-districts, become a PUE.
2) Macro-Femto scene
Fig. 2 is Macro sub-district in the instance of the present invention-Femto cell scenario sketch map.As shown in Figure 2:
For MUE:
When said idle pulley UE judges when self being in the edge that is deployed in the Femto sub-district in the service Macro cell coverage area and getting into the home base station cells area of coverage, this idle pulley UE measures the service macrocell according to the ABS subframe of this Femto sub-district.Just when MUE moves to the femto edge and enters in the femto covering (circle 1 of Fig. 2), MUE uses the ABS subframe of Femto sub-district and measures service Macro sub-district.
3) Macro-Femto-Pico scene
Fig. 3 is macrocell-home base station cells in the instance of the present invention-Microcell scene sketch map.As shown in Figure 3:
For PUE:
A. when judging, idle pulley UE self is in the Pico CRE zone of serving the Pico sub-district; And should the zone and during the overlapped coverage of Macro sub-district and Femto sub-district; Be the overlapping region (the diagonal line hatches zone among Fig. 3) of pico CRE, Macro and Femto, PUE uses:
A.1.PUE measure service Pico sub-district and adjacent Pico sub-district in the common subframe of the ABS in ABS in the macro sub-district and the Femto sub-district;
A.2. in carrying out the district reselecting evaluation process, increase a deviant on PUE measure R SRP value or the PUE district reselecting evaluate parameter;
B. when PUE moves to pico CRE border (circle 1 among Fig. 3 based on district reselecting R criterion, is considered deviant), but still in the overlay region of Macro and Femto the time, PUE possibly gravity treatment arrive the macro sub-district, becomes a MUE.
For MUE:
A. when judging, said idle pulley UE self is in the Microcell Pico CRE access areas that is deployed in the service macrocell coverage area; And should the zone and during the overlapped coverage of home base station cells idle pulley UE come the measuring adjacent Microcell according to the ABS of service macrocell and the common subframe of home base station cells ABS; Briefly; Exactly when MUE moves to the overlapping region of Macro and Femto, be applied in measuring adjacent Pico sub-district in the common subframe of ABS and the ABS in the Femto sub-district in the macro sub-district;
B. when MUE moves to the overlapping region of pico CRE, Macro and Femto (like the diagonal line hatches among Fig. 3 zone), MUE can gravity treatment pico sub-district, becomes a PUE.
The deviant of mentioning in above-mentioned each scene description is to increase a deviant on UE measure R SRP value or the UE district reselecting evaluate parameter.
In addition, to macro-pico and macro-pico-femto scene, idle pulley UE needs a plurality of threshold settings in order to judge own residing position, promptly in SIB, increases threshold parameter.Therefore according to the structure of SIB4 among the T S 36.331 and the determination methods of reference cell gravity treatment, in SIB4, increase an IE (being deviant), such as IEMeasRestrictionStartInfo, structure is following:
When the Q-offset parameter here can should start to UE is measured the resource limit setting;
UE reads from SIB4 after this IE, and the evaluation criteria that can reuse district reselecting R criterion is judged the position of oneself:
1) when measuring the sub-district of relevant physCellId (physical area mark sign ID), the Q-Offset parameter among the MeasRestrictionStartInfo is brought in the R criterion formulas
Whether the adjacent sub-district of 2) judging this physCellId indication satisfies Rn＞Rs
3) if satisfy Rn＞Rs, then UE thinks and has got into interference range or disturbed area.
4) if do not satisfy Rn＞Rs, then UE thinks that oneself is not in interference range or disturbed area.
Simultaneously, in order to accomplish the UE behavior in top each scene, should which sub-district which type of to be used to the UE notice and measure resource-constrained model.Be the method for in reuse adoption process, using eICIC below.Fig. 4 be use in the cell reselection process among the present invention eICIC flow chart.As shown in Figure 4, may further comprise the steps:
401, idle pulley UE obtains the resource limit information of measuring.Be specially idle pulley UE and receive the measurement resource limit information that network side is notified.Measure resource limit and comprise and measure resource-constrained model and corresponding physical cell ID, different measurement resource-constrained model correspondences is different is blank ABS subframe almost.
The UE that is idle pulley obtains its Serving cell and adjacent sub-district measurement resource-constrained model separately.Each is measured resource limit pattern can notify the corresponding district tabulation, such as notice PCI tabulation.That is to say that this measurement resource limit pattern only is applicable to the sub-district in the tabulation.
402; Idle pulley UE is according to the threshold parameter of broadcasting among the measured value of Serving cell and adjacent sub-district and the system information block SIB is judged own residing zone; If judging according to the threshold parameter of broadcasting among the SIB, UE oneself is not in interference region perhaps by interference region; Then execution in step 403, on the contrary execution in step 404.Wherein, measured value is the RSRP value of idle pulley UE measurement.
403, if judging according to the threshold parameter of broadcasting among the SIB, UE oneself is not in interference region perhaps by interference region, it does not use any measurement resource limit or deviant so.Process ends.
404, if idle pulley UE judges when self being in interference region, the sub-district relevant according to said measurement resource limit information measurement district reselecting.Specifically; Be exactly that UE oneself has got into interference region perhaps by interference region according to the threshold parameter judgement of broadcasting among the SIB; And the PCI of detected co-frequency cell belongs to certain and measures the pairing cell list of resource limit pattern, and UE can use corresponding measurement resource limit to measure relevant sub-district so.
405, idle pulley UE carries out district reselecting according to measurement result.
Idle pulley UE mainly is based on district reselecting R criterion, and under macrocell-Microcell and macrocell-Microcell-home base station cells scene, considers deviant, carries out district reselecting.That cover reselecting parameters was provided with before the real district reselecting thresholding of UE still adopted.Consider that deviant is that idle pulley UE obtains after the deviant from system information block, be brought in the R criterion formulas that the evaluation criteria of reusing district reselecting R criterion is judged the position of oneself.
Wherein, the idle pulley UE that mentions in the above-mentioned steps judges that needed threshold parameter in own present position and deviant dispose in system information, such as the SIB4 that is used for the co-frequency neighbor cell gravity treatment.
In sum; This idle pulley UE of the present invention obtains the resource limit information of measuring; Judge when self being in interference region; The technical scheme of district reselecting is carried out according to measurement result in the sub-district relevant according to said measurement resource limit information measurement district reselecting, has provided about using the concrete scheme of eICIC in the cell reselection process of idle pulley UE.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (9)
1. idle pulley UE residence reselecting in the Long Term Evolution LTE system is characterized in that this method comprises:
Idle pulley UE obtains the resource limit information of measuring;
Said idle pulley UE judges when self being in interference region, the sub-district relevant according to said measurement resource limit information measurement district reselecting;
Said idle pulley UE carries out district reselecting according to measurement result.
2. the method for claim 1 is characterized in that, said idle pulley UE obtains measurement resource limit information and comprises:
Said measurement resource limit information is for measuring resource-constrained model and corresponding physical cell ID PCI tabulation, and different measurement resource-constrained model correspondences is different is blank ABS subframe almost;
Idle pulley UE receives the measurement resource limit information of network side notice.
3. according to claim 1 or claim 2 method is characterized in that, said idle pulley UE judges and self is in interference region and comprises:
Idle pulley UE is according to the threshold parameter of broadcasting among the measured value of Serving cell and adjacent sub-district and the system information block SIB is judged own residing zone.
4. method as claimed in claim 2 is characterized in that, under macrocell-Microcell scene, said idle pulley UE judges when self being in interference region, and idle pulley UE comprises according to the relevant sub-district of said measurement resource limit information measurement district reselecting:
When said idle pulley UE judged the border that self is in the service Microcell and get into the cell edge expansion Pico CRE of Microcell, idle pulley UE measured service Microcell and adjacent Microcell according to the ABS subframe of the macrocell that covers the service Microcell;
When said idle pulley UE judged the Pico CRE access areas that self is in the Microcell of the service of being deployed in the macrocell coverage area, idle pulley UE measured this Microcell according to the ABS subframe of service macrocell.
5. method as claimed in claim 2; It is characterized in that; Under macrocell-home base station cells scene, said idle pulley UE judges when self being in interference region, and idle pulley UE comprises according to the relevant sub-district of said measurement resource limit information measurement district reselecting:
When said idle pulley UE judged the edge that self is in the home base station cells of the service of being deployed in the macrocell coverage area and gets into the home base station cells area of coverage, idle pulley UE measured the service macrocell according to the ABS subframe of this home base station cells.
6. method as claimed in claim 2; It is characterized in that; Under macrocell-Microcell-home base station cells scene, said idle pulley UE judges when self being in interference region, and idle pulley UE comprises according to the relevant sub-district of said measurement resource limit information measurement district reselecting:
Judge the Pico CRE zone that self is in the service Microcell as said idle pulley UE; And should the zone and during the overlapped coverage of macrocell and home base station cells, idle pulley UE measures service Microcell and adjacent Microcell according to the common subframe of macrocell ABS and home base station cells ABS;
When judging, said idle pulley UE self is in the Microcell Pico CRE access areas that is deployed in the service macrocell coverage area; And should the zone and during the overlapped coverage of home base station cells, idle pulley UE comes the measuring adjacent Microcell according to the ABS of service macrocell and the common subframe of home base station cells ABS.
7. the method for claim 1 is characterized in that, said idle pulley UE carries out district reselecting according to measurement result and comprises:
Idle pulley UE is based on district reselecting R criterion, and under macrocell-Microcell and macrocell-Microcell-home base station cells scene, considers deviant, carries out district reselecting.
8. method as claimed in claim 7 is characterized in that, saidly considers that under macrocell-Microcell and macrocell-Microcell-home base station cells scene deviant comprises:
Increase a side-play amount on Reference Signal Received Power RSRP value that idle pulley UE measures or the idle pulley UE district reselecting evaluate parameter.
9. method as claimed in claim 3 is characterized in that, said idle pulley UE comprises according to the threshold parameter of broadcasting among the measured value of Serving cell and adjacent sub-district and the system information block SIB is judged own residing zone:
The RSRP value that measured value is measured for idle pulley UE;
Idle pulley UE judges that needed threshold parameter in own present position and deviant dispose in system information;
Idle pulley UE obtains from system information block after the deviant, is brought in the R criterion formulas, and the evaluation criteria of reusing district reselecting R criterion is judged the position of oneself.
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