CN1852558A - Switching-over method - Google Patents
Switching-over method Download PDFInfo
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- CN1852558A CN1852558A CNA2005100798629A CN200510079862A CN1852558A CN 1852558 A CN1852558 A CN 1852558A CN A2005100798629 A CNA2005100798629 A CN A2005100798629A CN 200510079862 A CN200510079862 A CN 200510079862A CN 1852558 A CN1852558 A CN 1852558A
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Abstract
The method includes steps: (1) under control of network side, user terminal accomplishes measurement of signal intensities of adjacent cells, and sends measured report to radio network controller (RNC); (2) obtaining external interference value of candidate set of cell; (3) based on received type from measured report, comparison between external interference value and interference threshold, RNC executes switching judgment, and accomplishes switching if it is needed. When external interference in destination cell is heavy, the invention sets up lower priority for down going switching for destination cell so as to raise switching success ratio, and guarantee normal operation of network.
Description
Technical field
The present invention relates to mobile communication technology, refer to a kind of method of switching especially.
Background technology
In cell mobile communication systems, when moved another overlay area, network side still needed to provide lasting service for the user user from an overlay area.At this moment, just the user need be switched between different sub-districts.Reasonably switching can keep the continuation of user's communication, simultaneously also can be maximum utilize Radio Resource, service is provided for maximum users.
Switching is divided into soft handover and direct-cut operation two big classes, and soft handover is that user terminal remains the process of a wireless links with Radio Access Network when Radio Link takes place to increase or discharges.The advantage of soft handover is there is not link down, can bring better speech quality.Direct-cut operation is in handoff procedure, before user terminal and new base station are got in touch, interrupts earlier and the communicating by letter of former base station, and gets in touch with the foundation of new base station again.Of short duration interruption is arranged, easily call drop in the direct-cut operation.
Figure 1 shows that the soft switching process in Wideband Code Division Multiple Access (WCDMA) (WCDMA) cell mobile communication systems, signal measurement wherein all is based on the signal to noise ratio (Ec/Io) of downlink pilot frequency channel, specifically is made of following basic step:
Step 11: user terminal (UE) is finished the measurement to the neighbor cell pilot signal strength under the control of network side.
Step 12:UE sends measurement report for radio network controller (RNC).
Step 13:RNC carries out switch decision according to the measurement report of collecting to UE, and switch decision comprises whether decision increases, deletes or replace Radio Link, switches if carry out, and then execution in step 14; Otherwise, then do not increase, delete or replace Radio Link, finish current handling process.
Step 14: switch carrying out and to comprise a series of signaling procedure, is to increase by Radio Link, or process such as Radio Link deletion is finished.
In soft switching process, UE is under the control of network side, and to the RNC reporting measurements, this measurement report type is an event report.Be example now, introduce the soft switching process of WCDMA system, introduce the soft handover judging process with the 1A event report among the WCDMA, 1B event report, 1C event report.As shown in Figure 2, transverse axis is a time shaft among Fig. 2, and the longitudinal axis is pilot signal strength value (CPICH), and Δ T is the triggered time.
In Fig. 2, sub-district 1 is unique active set cell of UE under the initial situation, but along with UE is constantly close to sub-district 2, UE records sub-district 2 signal strength signal intensities to be strengthened gradually.T1 constantly the pilot signal strength measured value of sub-district 2 greater than MAX_CPICH_AS-(AS_Th-AS_Th_Hyst), and the duration surpass Δ T, UE carries out the 1A event report to RNC.The 1A event report is: the report of carrying out to RNC when certain neighbor cell pilot signal strength measured value of UE enters report district A, report district A is the interval greater than MAX_CPICH_AS-(AS_Th-AS_Th_Hyst), and wherein MAX_CPICH_AS is that active set cell pilot signal strength maximum, AS_Th are that relative threshold, AS_Th_Hyst are the relative threshold magnetic hysteresis.The difference of pilot signal strength measured value that then is expressed as the pilot signal strength measured value of sub-district 1 and sub-district 2 in Fig. 2 is at the 1A event report less than AS_Th-AS_Th_Hyst carried out.At this moment, sub-district 2 becomes the candidate set cells of UE.Owing in the prior art, the Soft Handover Algorithm of use limits the number that is positioned at active set cell can not be above 2.At this moment, network side then under the situation that this UE active set cell is discontented with, increases the switch decision of candidate set cells, and sub-district 2 is added active set cell, and at this moment, the active set cell of UE is sub-district 1 and sub-district 2.What is called active set cell and candidate set cells all belong to a class of measuring in the sub-district, and active set cell is to have enough signal strength signal intensities, in the sub-district that supports mobile is called out, are being to communicate simultaneously with UE just, are separated the relevant merging of mediation simultaneously at the UE place; The sub-district that candidate set cells can supports mobile be called out by signal strength signal intensity is formed.
Along with moving of UE, the UE signal strength signal intensity that records sub-district 3 strengthens gradually as can be seen from Figure 2, begins to surpass the signal strength signal intensity of sub-district 1.Be better than the signal measurements of the sub-district 1 in the active set when the measured value of sub-district 3 becomes constantly at T2, and continue to surpass Δ T, promptly sub-district 3 pilot signal strength measured values are greater than MIN_CPICH_AS+AS_Rep_Hyst, and UE carries out the 1C event report.The 1C event report is: when certain neighbor cell pilot signal strength measured value of UE enters report district C, the report of carrying out to RNC, i.e. this cell downlink pilot signal strength measured value pilot signal strength measured value of becoming and being better than certain sub-district in the active set, report district C is the interval greater than MIN_CPICH_AS+AS_Rep_Hyst, wherein, MIN_CPICH_AS is that active set cell pilot signal strength minimum value, AS_Rep_Hyst are for replacing the thresholding hysteresis.The 1C event report that the difference of pilot signal strength measured value that then is expressed as the pilot signal strength measured value of sub-district 3 and sub-district 1 in Fig. 2 is carried out during greater than AS_Rep_Hyst.At this moment, sub-district 3 becomes candidate set cells, owing to had two sub-districts in the active set cell, so the network side switch decision of sub-district 3 alternative cell 1, at this moment, the active set cell of UE becomes sub-district 2 and sub-district 3.
As can be seen from Figure 2, after sub-district 3 became active set cell, signal strength signal intensity just weakened always, T3 constantly the measured value of sub-district 3 less than MAX_CPICH_AS-(AS_Th+AS_Th_Hyst), and the duration surpasses Δ T, and at this moment, UE carries out the 1B event report.The 1B event report is: the report of carrying out to RNC when certain neighbor cell pilot signal strength measured value of UE leaves report district B, report district B is the interval less than MAX_CPICH_AS-(AS_Th+AS_Th_Hyst).The difference of pilot signal strength measured value that is expressed as sub-district 2 pilot signal strength measured values and sub-district 3 in Fig. 2 is greater than 1B event report that AS_Th+AS_Th_Hyst carried out, network side is deleted the switch decision of sub-district 3, and active set cell is shifted out in sub-district 3.At this moment, the only remaining sub-district 2 of the active set cell of UE.
More than be that soft switching process with WCDMA is an example, illustrate that switching of the prior art generally all is based on downstream signal, external interference does not exert an influence to handoff procedure.But in the wireless network environment of reality, there is multiple other types Wireless Communication Equipment near the network equipment, exists between the equipment of different systems and interfere with each other, such as of the interference of Personal Handyphone System (PHS) network to the WCDMA network.Frequency range between the PHS network using 1910MHz-1920MHz, more close with the frequency of WCDMA, obvious especially to the up channel interference of WCDMA network, and do not disturb descending.Therefore, because the asymmetry of disturbing, downstream signal is intact, and upward signal is poor, can cause equally call drop occurring when use has handoff technique now, and unsuccessful situation is cut in the sub-district.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of switching, and this method can improve success rate for switching under the heavier situation of Target cell external interference, guarantees the normal operation of network.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method of switching may further comprise the steps:
A, user terminal are finished the measurement of neighbor cell signal intensity under the control of network side, and send measurement report to radio network controller;
The external interference value of B, acquisition candidate set cells;
C, radio network controller be according to the type of receiving measurement report, and the comparative result of external interference value and interference threshold carries out switch decision, and finish switching when needs switch.
Wherein, step B detailed process is:
B1. the difference of making an uproar at the bottom of the received bandwidth total power that receives of calculation base station and the system;
B2. with the difference of the lifting value that user load produced in the result of calculation of step B1 and the candidate set cells as the external interference value.
Wherein, described interference threshold is determined according to the make an uproar relation of lifting of base station ascending load and the end.Described switch decision is for increasing Radio Link or replacing Radio Link.
Wherein, step C is specially: whether judge the external interference value less than interference threshold, if less than, then the measurement report type of receiving according to radio network controller is carried out corresponding switch decision, otherwise, do not carry out switch decision.
Wherein, described measurement report is the 1A event report, and the corresponding switch decision of then described execution is: carry out the switch decision that whether increases Radio Link.Described measurement report is the 1C event report, and the corresponding switch decision of then described execution is: carry out the switch decision of whether replacing Radio Link.
Changing method provided by the present invention in handoff procedure, makes switch decision not only according to the quality of the down-bound pilot frequency signal quality of offering on the user terminal measurement, also considers the external interference situation of switching target small area simultaneously.Earlier the down-bound pilot frequency signal quality is reported, carried out switch decision according to the external interference situation of switching target small area again, be equivalent to put the priority of the descending switching of Target cell low.Under the heavier situation of target external interference, can improve success rate for switching, guarantee the normal operation of network.
Description of drawings
Fig. 1 is a prior art soft handover realization flow schematic diagram;
Fig. 2 realizes principle schematic for the soft handover judgement;
Fig. 3 is a soft handover realization flow schematic diagram of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below enumerate embodiment, the present invention is described in further detail.
Core concept of the present invention is: in the basic process of switching, not only according to the quality of the down-bound pilot frequency signal quality of offering on the user terminal measurement, also consider the external interference situation of switching target small area simultaneously, according to the size of external interference value and the interference threshold of setting, carry out switch decision, finish handoff procedure.
Institute of the present invention extracting method can be applied in the multiple mobile communication system, as WCDMA, universal mobile telecommunications system (UMTS), GSM, CDMA.Be that example describes to implement changing method that the present invention is carried in the WCDMA system now, this changing method is a soft handover method.Specific implementation process is as follows: UE finishes the measurement of neighbor cell pilot signal strength under the control of network side, and measured value is reported.RNC is after receiving measurement report, measure the external interference value size of each neighbor cell jointly by RNC and base station node B, RNC is according to the comparable situation of external interference value and interference threshold, and the type of current event report, the judgement of execution soft handover, then UE finishes switching under the control of network side.Among the present invention, described soft handover judgement is for increasing Radio Link or replacing Radio Link, corresponding 1A event report of difference and 1C event report.
Utilize 1A event report shown in Figure 2 to describe for example in specific embodiment, specific implementation process may further comprise the steps as shown in Figure 3:
Step 33:RNC according to the received bandwidth total power (RTWP, received total wide band power) that the base station periodically reports, obtains the external interference value of sub-district 2 in the candidate set cells after receiving measurement report.
Here, the RTWP that the base station the receives stack with up lifting value of making an uproar at the bottom of for system, lifting value and external interference that up lifting value comprises user load again and produced, therefore, the external interference value equals up lifting value and deducts the lifting value that user load produces, and up lifting value equals again to make an uproar at the bottom of RTWP that the base station receives deducts system.
In the practical application, the RTWP that the base station receives is exactly the RTWP value of the current actual measurement in base station, and making an uproar at the bottom of the system is system noise when neither existing the user also not have external interference in the sub-district, and this value measures in the time of can setting up in system.The lifting value that described network internal user load is produced can be according to formula
Determine, wherein η
ULBe ascending load.
Based on above-mentioned analysis, at the bottom of deducting system, the RTWP value that the external interference value just equals the current actual measurement in base station makes an uproar the lifting value that deducts user load again and produced.Give an example, suppose that RTWP value that the base station receives is that the RTWP value of the current actual measurement in base station is A, the value of making an uproar be B at the bottom of the system, and the number of users of actual support is that the lifting value that user load produces is C, and so, the external interference value is A-B-C, and unit is decibel.
What introduce in the present embodiment is the situation of having only a candidate set cells, under the situation of a plurality of candidate set cells of physical presence, then selects the sub-district of signal quality the best to carry out the measurement of external interference value, carries out switch decision.
The external interference value that records in event report that step 34:RNC reports according to UE and the step 33 is carried out switch decision.Because what RNC received in the present embodiment is the 1A event report, so whether increase the switch decision of Radio Link in this step.When measured external interference value during greater than the interference threshold value set, then do not carry out the switch decision that increases Radio Link, sub-district 2 is not connected with UE, and the active set cell of UE still has only sub-district 1 at this moment, finishes current handling process; When external interference value during less than the interference threshold value set, then carry out the switch decision that increases Radio Link, increase Radio Link, sub-district 2 is connected with UE, and the active set cell of UE comprises sub-district 1 and sub-district 2.
The wherein setting of interference threshold can be considered to determine according to the make an uproar relation of lifting of base station ascending load and the end, and the end lifting of making an uproar is the system noise that is produced by load itself.For example, loaded in the WCDMA system 75% o'clock, the uplink interference that concerns of lifting improves 6dB owing to make an uproar in the end; Loaded on 50% o'clock, the uplink interference that concerns of lifting improves 3dB owing to make an uproar in the end.Wherein uplink interference comprises from interference between this community user and external interference.Therefore, when the network design load is higher, can the external interference decision threshold be set and hangs down, generally about 1dB; When the network design load is low, can the external interference decision threshold be set higher, generally about 2-3dB.
Step 35: carry out and switch, this treatment step is same as the prior art.
When UE sent the 1C event report to RNC, handoff process was the same substantially with the processing procedure that the 1A event report takes place.When UE after RNC sends the 1C event report, RNC obtains the external interference value size of candidate set cells according to the RTWP of NodeB periodic report, and the external interference value of candidate set cells size and the interference threshold of setting compared, if the external interference value, is not then carried out the sub-district greater than interference threshold and is replaced judgement; Otherwise carry out the sub-district and replace judgement.When UE to RNC send be the 1B event report time, carry out the deletion of active set cell, carry out according to former WCDMA soft handover judgement this moment.
Claims (7)
1, a kind of method of switching is characterized in that, this method may further comprise the steps:
A, user terminal are finished the measurement of neighbor cell signal intensity under the control of network side, and send measurement report to radio network controller;
The external interference value of B, acquisition candidate set cells;
C, radio network controller be according to the type of receiving measurement report, and the comparative result of external interference value and interference threshold carries out switch decision, and finish switching when needs switch.
2, method according to claim 1 is characterized in that, step B detailed process is:
B1. the difference of making an uproar at the bottom of the received bandwidth total power that receives of calculation base station and the system;
B2. with the difference of the lifting value that user load produced in the result of calculation of step B1 and the candidate set cells as the external interference value.
3, method according to claim 1 is characterized in that, described interference threshold is determined according to the make an uproar relation of lifting of base station ascending load and the end.
4, method according to claim 1 is characterized in that, described switch decision is for increasing Radio Link or replacing Radio Link.
5, method according to claim 1 is characterized in that, step C is specially: judge that whether the external interference value is less than interference threshold, if less than, then the measurement report type of receiving according to radio network controller is carried out corresponding switch decision, otherwise, do not carry out switch decision.
6, method according to claim 5 is characterized in that, described measurement report is the 1A event report, and the corresponding switch decision of then described execution is: carry out the switch decision that whether increases Radio Link.
7, method according to claim 5 is characterized in that, described measurement report is the 1C event report, and the corresponding switch decision of then described execution is: carry out the switch decision of whether replacing Radio Link.
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| WO2009143747A1 (en) * | 2008-05-28 | 2009-12-03 | 华为技术有限公司 | Automatic neighbor relation measuring method, terminal equipment and base station equipment |
| WO2010127506A1 (en) * | 2009-05-08 | 2010-11-11 | 华为技术有限公司 | Method, device and system for reporting measuring result of a closed subscriber group cell |
| CN101897213A (en) * | 2007-10-12 | 2010-11-24 | 高通股份有限公司 | Identification of target node for wireless handoff |
| CN101931988A (en) * | 2009-06-26 | 2010-12-29 | 华为技术有限公司 | Network switching method, evolution base station and communication system |
| CN101933383A (en) * | 2008-02-01 | 2010-12-29 | 高通股份有限公司 | Utran enhancements for the support of inter-cell interference cancellation |
| CN101646212B (en) * | 2008-08-06 | 2012-01-11 | 电信科学技术研究院 | Cell switching control method, device and communication system |
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| WO2015085471A1 (en) * | 2013-12-09 | 2015-06-18 | 华为技术有限公司 | Cell handover method and device, and network system |
| US9402193B2 (en) | 2009-03-19 | 2016-07-26 | Qualcomm Incorporated | Systems, apparatus and methods for interference management in wireless networks |
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| CN106998580A (en) * | 2016-01-25 | 2017-08-01 | 上海无线通信研究中心 | Extensive mimo system cell selecting method and base station |
| WO2017177421A1 (en) * | 2016-04-14 | 2017-10-19 | Intel Corporation | Device and method for performing handover in massive multiple-input-multiple-output (mimo) systems |
| CN109890054A (en) * | 2012-01-21 | 2019-06-14 | 华为技术有限公司 | The method and apparatus of enhancing are measured in wireless communication system |
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| CN101897213A (en) * | 2007-10-12 | 2010-11-24 | 高通股份有限公司 | Identification of target node for wireless handoff |
| CN101897213B (en) * | 2007-10-12 | 2015-11-25 | 高通股份有限公司 | To the identification of the destination node for wireless switching |
| US9173148B2 (en) | 2007-10-12 | 2015-10-27 | Qualcomm Incorporated | Identification of target node for wireless handoff |
| CN101933383A (en) * | 2008-02-01 | 2010-12-29 | 高通股份有限公司 | Utran enhancements for the support of inter-cell interference cancellation |
| US9246541B2 (en) | 2008-02-01 | 2016-01-26 | Qualcomm Incorporated | UTRAN enhancements for the support of inter-cell interference cancellation |
| WO2009143747A1 (en) * | 2008-05-28 | 2009-12-03 | 华为技术有限公司 | Automatic neighbor relation measuring method, terminal equipment and base station equipment |
| CN103139831B (en) * | 2008-05-28 | 2017-04-12 | 华为技术有限公司 | Automatic neighborhood relation measuring method, terminal device and base station device |
| CN101594631B (en) * | 2008-05-28 | 2013-01-30 | 华为技术有限公司 | Method for measuring automatic neighboring relationship, end equipment and base station equipment |
| CN101646212B (en) * | 2008-08-06 | 2012-01-11 | 电信科学技术研究院 | Cell switching control method, device and communication system |
| US9402193B2 (en) | 2009-03-19 | 2016-07-26 | Qualcomm Incorporated | Systems, apparatus and methods for interference management in wireless networks |
| WO2010127506A1 (en) * | 2009-05-08 | 2010-11-11 | 华为技术有限公司 | Method, device and system for reporting measuring result of a closed subscriber group cell |
| WO2010127537A1 (en) * | 2009-05-08 | 2010-11-11 | 华为技术有限公司 | Method, apparatus and system for reporting measurement result of closed subscriber group cell |
| CN101931988A (en) * | 2009-06-26 | 2010-12-29 | 华为技术有限公司 | Network switching method, evolution base station and communication system |
| CN101931988B (en) * | 2009-06-26 | 2013-08-28 | 华为技术有限公司 | Network switching method, evolution base station and communication system |
| CN109890054B (en) * | 2012-01-21 | 2023-12-15 | 华为技术有限公司 | Method and apparatus for measurement enhancement in a wireless communication system |
| CN109890054A (en) * | 2012-01-21 | 2019-06-14 | 华为技术有限公司 | The method and apparatus of enhancing are measured in wireless communication system |
| WO2015062363A1 (en) * | 2013-10-30 | 2015-05-07 | 中兴通讯股份有限公司 | Anti-interference method and apparatus for fixed wireless terminal |
| CN105052204A (en) * | 2013-12-09 | 2015-11-11 | 华为技术有限公司 | Cell handover method and device, and network system |
| WO2015085471A1 (en) * | 2013-12-09 | 2015-06-18 | 华为技术有限公司 | Cell handover method and device, and network system |
| CN106998580A (en) * | 2016-01-25 | 2017-08-01 | 上海无线通信研究中心 | Extensive mimo system cell selecting method and base station |
| CN106998580B (en) * | 2016-01-25 | 2020-08-11 | 上海无线通信研究中心 | Large-scale MIMO system cell selection method and base station |
| WO2017177421A1 (en) * | 2016-04-14 | 2017-10-19 | Intel Corporation | Device and method for performing handover in massive multiple-input-multiple-output (mimo) systems |
| US11159995B2 (en) | 2016-04-14 | 2021-10-26 | Intel Corporation | Device and method for performing handover in massive multiple-input-multiple-output (MIMO) systems |
| CN114189297A (en) * | 2021-11-23 | 2022-03-15 | 上海移为通信技术股份有限公司 | Wireless communication device and interference detection method thereof |
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