CN102257850B - TDD intra frequency handover measurement enhancement method and device - Google Patents
TDD intra frequency handover measurement enhancement method and device Download PDFInfo
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- CN102257850B CN102257850B CN200880132335.1A CN200880132335A CN102257850B CN 102257850 B CN102257850 B CN 102257850B CN 200880132335 A CN200880132335 A CN 200880132335A CN 102257850 B CN102257850 B CN 102257850B
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- rscp
- serving cell
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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Abstract
A method for performing handover measurement may comprise steps of calculating received signal code powers (RSCPs) of a serving cell and a target cell; determining if the RSCPs meet a trigger criteria; and comparing the RSCP of the serving cell with an absolute threshold. By comparing the RSCP of the serving cell with the absolute threshold, the UE may evaluate the communication quality with the current serving cell, making it possible to report to the RNC when the communication condition degrades rapidly without waiting for a fixed period as in the prior art.
Description
Technical field
In general, the present invention relates to the switching between the frequency band in cellular radio communication system.Not exclusively specifically, the present invention relates to 3G (third generation) communication system, frequently, switch as TDD between the different districts in TD-SCDMA.
Background technology
Universal Mobile Telecommunications System (UMTS) network architecture as shown in Figure 1 comprises core net (CN), UMTS terrestrial radio Access Network (UTRAN) and subscriber equipment (UE).In system, there is the radio interface Uu between Iu interface and UTRAN and the UE between two general interface: UTRAN and core net.UTRAN is made up of the some radio network sub-system (RNS) that interconnect by Iur interface.This interconnection allows the process that is independent of core net between different RNS.RNS is made up of radio network controller (RNC) and some base stations (Node B).Base station is connected to RNC by Iub interface.One or more communities can be served in a base station, and conventionally serve multiple UE.
Each base station can be in conjunction with communicating by letter with UE on multiple channels with the various technology RAKE diversity scheme such as smart antenna.Each UE comprises reflector, receiver, controller and user interface, and identifies by particular user equipment unit identifier.
In this class cellular radio communication system, may need handover operation, to allow the dedicated radio link set up to continue during in moving between cells as UE.Low signal intensity or the instruction of bad signal quality usually represent that UE approaches the border between Liang Ge community.More approach Target cell if UE moves to, dedicated radio link is switched to wireless radio transmission and the reception that Target cell is improved conventionally.
In current UMTS TDD system, be no matter frequently in or frequently between the sole criterion of switching be the path loss difference between current base station (, " service " base station) and target BS.This situation as shown in Figure 2.Mobile subscriber equipment (UE) is shown the signal receiving from two base stations: 1) serving BS BS1; And 2) target BS BS2.UE receives the physical channel of carrying broadcast channel BCH1 and BCH2 from two base station BSs 1 and BS2, and measures the signal strength signal intensity of channel BCH1, BCH2.When the BCH2 from Target cell is recently in the time that the channel BCH1 of Serving cell is enough strong, measurement result is transmitted to RNC, and RNC determines whether to initiate to switch.
Carried out to determine whether that the current mechanism that starts to switch can illustrate with reference to Fig. 3 A by prior art UMTS TDD communication system.In the time that particular event meets trigger criteria, " measurement report " message will send to its current service RNC (radio network controller) from UE.In general, when measured P-CCPCH (main Common Control Physical Channel) RSCP (received signal code power) than current P-CCPCH RSCP large when predetermined value, can report this event to Serving RNC, wherein predetermined value is called lag parameter in TDD communication, and it is by " measure and control " the set parameter of message by RNC.Serving RNC can start handover evaluation according to event report and measurement result.But for example, in the time of the fast moving of the border of UELiang Ge community, this process can repeat, switch back and forth, this is called pingpang handoff.This is undesirable, because call quality may reduce, and this process is poor efficiency in the use of system resource.
Therefore, reduce the quantity of unnecessary switching, current 3G handoff algorithms adopts hysteresis and triggered time mechanism in the quantity of institute's reporting event and trades off between the switching delay time.The value in triggered time offers UE in the reporting standards field of measuring control message.The effect in triggered time is, only after the condition of event has existed the appointment triggered time, just triggers report.That is to say, the signal difference between timer Liang Ge community brings into operation while being equal to or greater than lagged value.Only in the time that the measurement RSCP of Target cell has passed through predetermined period of time than the measurement RSCP of Serving cell after large hysteresis, just reporting event.
Summary of the invention
Although the introducing of " triggering timing device " can reduce many unnecessary switchings, it brings other problem.Designer must carefully select " triggering timing device " parameter.If " triggering timing device " parameter arranges too shortly, it cannot avoid unnecessary switching effectively, if this parameter arranges longly, communication system cannot adapt to the rapid degradation of signals on current channel, because UE is to base station report, until expire by " triggering timing device " set time cycle of parameter.This makes to switch too late generation or even causes call drop.
Therefore, need to provide a kind of for the method to base station report before exceeding its permissible range at the power of Serving cell.Solve the aforementioned problems in the prior, the invention provides a kind ofly for carry out the method for handover measurement in TDD communication system, comprise the following steps:
The received signal code power (RSCP) of calculation services community and Target cell; And
Determine whether RSCP meets trigger criteria; Described method is characterised in that, it also comprises the step that the RSCP of Serving cell and absolute threshold are compared.
By the RSCP of Serving cell and absolute threshold are compared, UE can assess the communication quality with current service cell, thereby makes likely in the time that communication condition is demoted rapidly, to report to RNC, and without the fixed cycle of waiting for as in prior art.
In addition, the RSCP value that used here can be the value using in judging whether to meet the process of trigger criteria, and therefore this method can be carried out according to the current system resource of UE, and without carrying out additional measurement, thereby the use of improved system resource.
Preferably, if the RSCP of Serving cell lower than absolute threshold, UE sends measurement report to RCN.This measurement report can comprise the 1g event defining in 3GPP TS 25.331 v4.17.0 for example.1g event is used for to RNC report TDD " best cell change ", and makes RNC start handover evaluation.The present invention shortens measurement event 1g report time in the situation that current service cell signal is demoted rapidly, and reduces the possibility of call drop.
Preferably, trigger criteria is whether the RSCP of Target cell is than the large predetermined value of the RSCP of Serving cell, for example lag parameter, and the method also comprises the following steps: to start the timer of predetermined period of time in the time meeting trigger criteria, and the RNC to Serving cell sends measurement report after process predetermined period of time.Communication quality on current channel is during higher than absolute channel, and the present invention can reduce effectively by the combination of lag parameter and timer the quantity of unnecessary switching.Therefore, the present invention does not have negative effect to current mechanism.
Preferably, predetermined period of time and predetermined value and absolute threshold are arranged by measuring control message by RNC.For example, predetermined period of time and predetermined value can be " triggering timing device " and the lag parameters using during event 1g measures.Therefore, the present invention can be by adding simply new argument in RRC message " measure control ", absolute threshold is realized.
It is a kind of for carrying out the device of handover measurement that the present invention also provides, and comprising:
Be used for the parts of the received signal code power (RSCP) of calculation services community and Target cell;
For determining whether RSCP meets the parts of trigger criteria; And
For the parts that the RSCP of Serving cell and absolute threshold are compared.
It is a kind of for carrying out the computer program of said method that the present invention also provides.Computer program can comprise that the set of computer-executable instructions of storing in the data mediums such as such as memory stick closes.Set of computer-executable instructions is closed the universal or special processor allowing in UE and is carried out said method, and it can also can be used for for example downloading from remote server via WAP service.
Brief description of the drawings
By the more specifically description of following preferred embodiment as shown in the drawing, above-mentioned and other objects, features and advantages of the present invention will be very obvious, and in accompanying drawing, reference number represents the same section in each view.Accompanying drawing is not necessarily drawn in proportion, emphasis but be to illustrate principle of the present invention.
Fig. 1 is the sketch that wherein can advantageously adopt example mobile communication system of the present invention.
Fig. 2 is the prior art UE that receives broadcast channel from two base stations.
Fig. 3 A-C is the diagrammatic view that the handover measurement mechanism adopting in prior art and the present invention is shown respectively.
Fig. 4 is the flow chart that improvement switching measurement method according to an embodiment of the invention is shown.
Embodiment
For convenience of explanation instead of limit, the details such as for example concrete framework, interface, technology are proposed, to thoroughly understand the present invention in below describing.But, it will be apparent to one skilled in the art that also and can in other embodiment that departs from these details, implement the present invention.In other cases, omit the detailed description to well-known device, circuit and method, in order to avoid unnecessary details makes description of the invention hard to understand.In the non-limiting example context of the universal mobile telecommunications shown in Fig. 1 (UMTS), the present invention is described.
Fig. 3 B is the diagrammatic view that the handover measurement mechanism of available technology adopting is shown.At the radio access bearer (RAB) that is established to UE afterwards, radio network controller (RNC) sends " measure and control " message to UE, measures to enable UE.Then, UE assesses certain trigger condition of contrast the received signal code power (RSCP) of the main Common Control Physical Channel (P-CCPCH) of current area 1 and Target cell 2, and sends event 1g to RNC in the time meeting this trigger condition.In 3GPP specification 25.331 or CCSA RRC agreement, event 1g is used for reporting TDD " best cell change ".It will switch in conventionally triggering frequently.
As described in reference to Fig. 3 A, reduce the quantity of unnecessary switching, this process adopts two parameters all the time: lag parameter and " triggering timing device " parameter, both arrange by " measure and control " message by RNC.1g event criteria in Fig. 3 B is:
1), if meet formula 1, start by " triggering timing device "; And
2), only after " triggering timing device " expires, just report 1g event.
Formula 1 is defined as follows:
(formula 1)
Wherein, Mtar is the current P-CCPCH RSCP of the evaluation community 2 that represents with mW, and H1g is the lag parameter of event 1g, and Mcurr is the current P-CCPCH RSCP of the current service cell that represents with mW.
Can understand, only after " triggering timing device " expires, just trigger 1g event.Although this can reduce unnecessary switching,, it for example will cause other problem in the time that the communication condition of Serving cell is demoted rapidly.As shown in Figure 3 B, in the time that the P-CCPCH RSCP of community 1 and community 2 meets formula 1, UE starts triggering timing device to count at t1.According to prior art, in the time that triggering timing device expires, UE is at t2 reporting event 1g.RNC can respond the 1g event receiving from UE and correspondingly start to carry out switching.For example, but in some cases, when the communication link between DangUEYu community 1 is blocked by certain high constructure, the communication quality of community 1 is demoted rapidly after t1.The user of UE thereby bear the communication quality of extreme difference in the time cycle between t1 and t2, even because degradation rapidly interrupts.
Therefore, in the time that demoting rapidly, communication quality need to shorten report delay.Fig. 3 C is the diagrammatic view illustrating according to handover measurement mechanism of the present invention.In the embodiment of Fig. 3 C, introduce absolute threshold THa.Except whether the RSCP that judges community 1 and 2 meets formula 1, and if be, wait for outside set time cycle of " triggering timing device " parameter, according to UE of the present invention also by Serving cell, P-CCPCH RSCP and the absolute threshold of community 1 compare.
When the RSCP of Serving cell is during lower than this absolute threshold, this means that the communication quality between UE and current service cell is not enough to keep gratifying service.So, UE can report 1g event to RNC at t2 ', instead of waits until the determined time point t2 of " triggering timing device " parameter.Handover measurement mechanism according to the present invention shortens measurement event 1g report time in the situation that current service cell signal is demoted rapidly, and reduces the possibility of call drop.
Here the RSCP value that used can be the value using in judging whether to meet the process of trigger criteria, and therefore this method can the current system resource based on UE be carried out, and without carrying out additional measurement, thereby the use of improved system resource.In addition, absolute threshold also can be arranged by " measure and control " message identical with lag parameter with " triggering timing device " by RNC.Advantageously, community or one by one RAB type ground change absolute threshold one by one.That is to say, can be that each community or RAB type are set up threshold value separately.
Fig. 4 is the flow chart that improvement switching measurement method according to an embodiment of the invention is shown.Method 400 is from step 402, and wherein UE receives " measure and control " message.This message comprises lag parameter H1g, " triggering timing device " parameter and absolute threshold.In step 404, UE, based on these parameters, by according to the value of " triggering timing device " parameter, counter being set, carrys out its intraware of initialization.
Then, the received signal code power Mtar (step 408) on the main Common Control Physical Channel of the received signal code power Mcurr (step 406) on the main Common Control Physical Channel of its calculation plot 1 and community 2.In step 410, UE determines whether the relation between these two received signal code powers meets formula 1 as above,, the received signal code power of Target cell (community 2) whether than the received signal power of current service cell (community 1) large predetermined value H1g.
If the definite result in step 410 is sure, the method proceeds to step 412, and counter starts to successively decrease, and " triggering timing device " set time cycle of parameter is counted.In step 414, whether UE, by determining whether counter is greater than 0, has expired since the relation between the next received signal code power of determining " triggering timing device " Zi Liangge community meets formula 1.Whether too promptly if the definite result in step 414 is to negate, the method turns back to step 418, so that by received signal code power and absolute threshold are compared, determine the communication quality degradation between UE and current service cell.If the received signal code power of Serving cell is higher than absolute threshold, the method forwards step 406 to, and repeating step 406-414.
But, if the result of step 414 is, this means, " triggering timing device " expired since formula 1 is remained valid, if or the received signal code power of current service cell lower than absolute threshold to indicate the communication quality in current communication channel to be not enough to obtain gratifying service, the method forwards step 416 to.
In step 416, UE will report 1g event to RNC, to initiate handover evaluation.Then, the method finishes in step 420.If the definite result in step 410 is to negate, the method also proceeds to step 420, and finishes the measurement to current goal community.
Although the method adopts the example of current service cell and a Target cell to illustrate, and those skilled in the art may appreciate that, can have multiple communities of assessing in this process.Can assess one by one the RSCP of these multiple communities, to reduce hardware complexity, or reduce Measuring Time simultaneously, depend on particular system requirement.In addition, may be preferably,, before the received signal code power that contrasts Serving cell is evaluated, sort according to its received signal code power or other communication quality parameter in these multiple communities.The community with highest received signal code power will obtain first evaluated limit priority.Like this, the method will have the more high probability that finds best cell and the communication quality on current area to be altered to best candidate cell when inadequate.
Although described series of steps about Fig. 4, the order of these actions can be through amendment in other realization of principle according to the invention.In addition, irrelevant action can executed in parallel.For example, the step 418 that the RSCP of Serving cell and absolute threshold are compared can be inserted the diverse location from step 406 to step 414, and can realize the target of reporting 1g event before " triggering timing device " expires.
The above description of the preferred embodiments of the present invention furnishes an explanation and describes, but is not want exhaustive the present invention or limit the invention to disclosed accurate form.According to above-mentioned instruction, modifications and changes are possible, or can be obtained from the practice of the present invention.
It will be apparent to one skilled in the art that aspect of the present invention as above can be by many multi-form realization of software, firmware and hardware in realizing shown in accompanying drawing.The actual software code or the special control hardware that are used for the aspect that realizes principle according to the invention are not limitation of the present invention.Therefore, do not have the operation and the Hang that describe each side with reference to concrete software code to understand Wei –, those skilled in the art can realize according to description design herein software and the control hardware of each side.
In addition, some part of the present invention can be embodied as " logic " of carrying out one or more functions.This logic can comprise the hardware such as firmware hardwired logic, application-specific integrated circuit (ASIC), field programmable gate array, microprocessor, software, or the combination of hardware and software.
Should emphasize, the term using in this specification and/or claims " comprises/comprises " being used for indicating and has described feature, integer, step or an assembly; But do not get rid of existence or add one or more further features, integer, step, assembly or above-mentioned every group.
The element using in the application, action or instruction should be interpreted as for the present invention to be crucial or requisite, unless otherwise noted.And the article " a " using is herein intended to comprise one or more.In the situation that only wanting to refer to one, use term " " or similar language.
Claims (8)
1. for carrying out a method for handover measurement, comprise the following steps:
The received signal code power (RSCP) (406,408) of calculation services community and Target cell;
Determine whether described RSCP meets trigger criteria (410);
Described method is characterised in that, it also comprises the following steps:
In the time meeting described trigger criteria, start the timer (412) of predetermined period of time;
Through after described predetermined period of time, send measurement report (416) to the RNC of described Serving cell;
Before described predetermined period of time expires, the RSCP of described Serving cell and absolute threshold are compared to (418); And
If the RSCP of described Serving cell, lower than described absolute threshold, sends described measurement report (416) to the described RNC of described Serving cell immediately.
The method of claim 1, wherein described trigger criteria be described Target cell RSCP whether than the RSCP of described Serving cell large predetermined value.
3. method as claimed in claim 2, wherein, described predetermined period of time, described predetermined value and described absolute threshold are arranged by measuring control message by described RNC.
4. the method as described in claim 1 or 3, wherein, described measurement report comprises the 1g event of measurement result being notified to described RNC.
5. for carrying out a device for handover measurement, comprising:
Be used for the parts of the received signal code power (RSCP) (406,408) of calculation services community and Target cell;
For determining whether described RSCP meets the parts of trigger criteria (410);
For predetermined period of time being counted the timer of (412) in the time meeting described trigger criteria;
For send the parts of measurement report (416) to the RNC of described Serving cell after the described predetermined period of time of process;
For the RSCP of described Serving cell and absolute threshold being compared to the parts of (418) before described predetermined period of time expires; And
If for the RSCP of described Serving cell lower than described absolute threshold,, send immediately the parts of described measurement report (416) to the described RNC of described Serving cell.
6. device as claimed in claim 5, wherein, described trigger criteria be described Target cell RSCP whether than the RSCP of described Serving cell large predetermined value.
7. device as claimed in claim 6, wherein, described predetermined period of time, described predetermined value and described absolute threshold are arranged by measuring control message by described RNC.
8. the device as described in claim 5 or 7, wherein, described measurement report comprises the 1g event of notifying described RNC.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2008/001990 WO2010066063A1 (en) | 2008-12-10 | 2008-12-10 | Tdd intra frequency handover measurement enhancement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102257850A CN102257850A (en) | 2011-11-23 |
| CN102257850B true CN102257850B (en) | 2014-12-03 |
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| CN200880132335.1A Expired - Fee Related CN102257850B (en) | 2008-12-10 | 2008-12-10 | TDD intra frequency handover measurement enhancement method and device |
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| Country | Link |
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| CN (1) | CN102257850B (en) |
| WO (1) | WO2010066063A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110319080A1 (en) * | 2010-06-24 | 2011-12-29 | Maik Bienas | Method of cell reselection and cellular radio terminal |
| CN102316463B (en) * | 2010-07-06 | 2015-05-20 | 电信科学技术研究院 | Carrier frequency regulation method and system |
| CN105103614A (en) * | 2013-01-11 | 2015-11-25 | 高通股份有限公司 | Method and apparatus for fast handover evaluation |
| WO2014107881A1 (en) * | 2013-01-11 | 2014-07-17 | Qualcomm Incorporated | Method and apparatus for fast handover evaluation |
| CN103974351B (en) * | 2013-01-24 | 2017-11-28 | 中国移动通信集团北京有限公司 | A kind of switching method and network side equipment |
| US9078180B2 (en) | 2013-02-26 | 2015-07-07 | Qualcomm Incorporated | Measurement reporting to avoid strong interference |
| US20150049737A1 (en) * | 2013-08-19 | 2015-02-19 | Qualcomm Incorporated | Measurement reporting when communicating with weak serving cell |
| US9516541B2 (en) * | 2013-09-17 | 2016-12-06 | Intel IP Corporation | Congestion measurement and reporting for real-time delay-sensitive applications |
| US20150281989A1 (en) * | 2014-04-01 | 2015-10-01 | Qualcomm Incorporated | Delaying transmission of measurement report |
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| CN2566537Y (en) * | 2001-08-16 | 2003-08-13 | 交互数字技术公司 | User equipment for definiting switchover or not |
| CN1694565A (en) * | 2005-05-20 | 2005-11-09 | 上海贝豪通讯电子有限公司 | Method of switching in TD-SCDMA communication system |
| CN101075830A (en) * | 2006-05-17 | 2007-11-21 | 大唐移动通信设备有限公司 | Method for determining down initial transmitting power |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7529560B2 (en) * | 2004-06-10 | 2009-05-05 | Nokia Corporation | Intersystem cell reselection from GERAN to UTRAN |
| KR101091038B1 (en) * | 2005-05-10 | 2011-12-09 | 에스케이 텔레콤주식회사 | Handover Method for Dual Band/Dual Mode Mobile Communication Terminal |
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2008
- 2008-12-10 CN CN200880132335.1A patent/CN102257850B/en not_active Expired - Fee Related
- 2008-12-10 WO PCT/CN2008/001990 patent/WO2010066063A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2566537Y (en) * | 2001-08-16 | 2003-08-13 | 交互数字技术公司 | User equipment for definiting switchover or not |
| CN1694565A (en) * | 2005-05-20 | 2005-11-09 | 上海贝豪通讯电子有限公司 | Method of switching in TD-SCDMA communication system |
| CN101075830A (en) * | 2006-05-17 | 2007-11-21 | 大唐移动通信设备有限公司 | Method for determining down initial transmitting power |
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| Title |
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| 3GPP TS 25.331 V4.17.0;3GPP;《3GPP》;20050331;正文第861—862页 * |
| 3GPP.3GPP TS 25.331 V4.17.0.《3GPP》.2005,正文第861—862页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010066063A8 (en) | 2011-09-01 |
| WO2010066063A1 (en) | 2010-06-17 |
| CN102257850A (en) | 2011-11-23 |
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