CN1859705A - Method for reducing soft switching resource consumption - Google Patents
Method for reducing soft switching resource consumption Download PDFInfo
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- CN1859705A CN1859705A CN 200510027890 CN200510027890A CN1859705A CN 1859705 A CN1859705 A CN 1859705A CN 200510027890 CN200510027890 CN 200510027890 CN 200510027890 A CN200510027890 A CN 200510027890A CN 1859705 A CN1859705 A CN 1859705A
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Abstract
The present invention discloses reducing soft switching resource consumptive method, in each base station with base station controller having large time delay difference, saving soft switching network resources. It contains regular measuring cell base station with base station controller time delay, mutually configuring excessive time delay difference neighbor cell as prohibiting switching cell, these cell having prohibiting switching relation with UE current location cell not participation soft switching cell measuring.
Description
Technical field
The present invention relates to mobile communication technology, particularly the treatment technology of IuB interface transmission delay in the broadband CDMA system.
Background technology
Universal mobile telecommunications system (Universal Mobile Telecommunications System, be called for short " UMTS ") be (the European Telecommunications StandardsInstitute of ETSI European Telecommunications Standards Institute, be called for short " ETSI ") propose, be intended to be smoothly transitted on global system for mobile communications (Global System formobile Communication is called for short " the GSM ") network foundation solution of 3G (Third Generation) Moblie.Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, be called for short " WCDMA ") be one of international standard of International Telecommunications Union's (International Telecommunications Union is called for short " ITU ") Global 3G mobile communication of admitting.Also can be described as the 3-G (Generation Three mobile communication system) that puts it into commercial operation the earliest in the world, is the standard of European 3-G (Generation Three mobile communication system) Frequency Division Duplexing (FDD) (Frequency Division Duplex is called for short " FDD ") frequency range simultaneously.Because UMTS adopts Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access is called for short " WCDMA ") air interface technologies, therefore, also the UMTS system is called the WCDMA communication system usually.
As shown in Figure 1, the UMTS system has adopted and the similar structure of second generation mobile communication system, by such as cell phone, portable computer, the subscriber equipment of vehicular phone and so on (User Equipment, be called for short " UE "), be responsible for to handle universal mobile telecommunications system grounding wireless access network (the UMTS Terrestrial Radio Access Network of all and wireless function associated, be called for short " UTRAN "), and be responsible for to handle that all voice calls are connected with data in the UMTS system, and the core net of the exchange of realization and external network and routing function (Core Net is called for short " CN ") constitutes.
Wherein CN is from being divided into circuit switching (Circuit Switching is called for short " CS ") territory and packet switching (Packet Switching is called for short " PS ") territory in logic.
And UTRAN comprises one or several RNS (Radio Network Subsystem is called for short " RNS ").As shown in Figure 2, each RNS is made up of a radio network controller (Radio NetworkController is called for short " RNC ") and one or more base-station node (Node Base Station is called for short " NodeB ").Wherein, be connected by the Iu interface between RNC and the CN; NodeB is connected by Iub interface with RNC; Connect by the Iur interface between the RNC, the Iur interface can connect by the connection of the direct physical between the RNC or by transmission network to be realized.
In said structure, RNC is responsible for distributing and is attached thereto with control or the Radio Resource of relevant NodeB, in other words, promptly be responsible for the Radio Resource of control UTRAN, mainly finish functions such as connection foundation and disconnection, switching, the merging of grand diversity, RRM control.
NodeB then is responsible for finishing the conversion of the data flow between Iub interface and the Uu interface, also participates in a part of RRM simultaneously.Specifically, it comprises radio receiving-transmitting unit and Base-Band Processing parts, as mentioned above, by the Iub interface and the RNC interconnection of standard, mainly finishes the processing of Uu interface physical layer protocol.Its major function is spread spectrum, modulation, chnnel coding and despreading, demodulation, channel-decoding, also comprises the functions such as mutual conversion of baseband signal and radiofrequency signal.
In mobile communication system, switch the critical function that is absolutely necessary.Because the overlay area of a base station is limited, and along with the moving of subscriber equipment (User Equipment, be called for short " UE "), for keep communicating by letter continuously, UE and internetwork wireless connections must be transferred to the another one sub-district by a sub-district, and Here it is switches.The switching of gsm system generally is the Radio Link that disconnects original sub-district at cell edge earlier, foundation and the newly Radio Link of sub-district again, and this switching is called direct-cut operation.And in the WCDMA system except direct-cut operation, also introduced the notion of soft handover.Soft handover is the peculiar switching mode of cdma system, because neighbor cell can be configured to same frequency, travelling carriage can be set up wireless connections with plural sub-district simultaneously when cell edge, that is to say, soft handover allows under the situation of the Radio Link of maintenance and former sub-district, sets up the Radio Link with Target cell earlier.But when UE was in soft changing state, according to the regulation of 3GPP, UE must keep strict synchronized relation (assurance air interface synchronization) between a plurality of wireless physical channel.In order to reach this target, in the 3GPP agreement, stipulated the process of transport channel synchronization.Transport channel synchronization mechanism provides a public number of frames (CFN) between UTRAN and UE, the moment that this number of frames has specified the inner transmission block that transmits of transmission channel to send aloft.CFN is interface transmission aloft not, but is mapped as in physical layer the moment of SFN.Fig. 4, Fig. 5 have illustrated in the prior art UTRAN transport channel synchronization mechanism respectively and under soft changing state, UTRAN transport channel synchronization mechanism.
In the time of need carrying out soft handover, base station controller sends measures control messages to subscriber equipment.Subscriber equipment is according to the cell measurement that the cell information that provides in the control messages is used for soft handover is provided.In technique known standard 3GPP TS 25.402 " Synchronisation in UTRAN Stage 2 " (Chinese name can be translated into " UTRAN in the 2nd stage synchronously "), stipulated the transport channel synchronization mechanism under the soft changing state.
In actual applications, there is following problem in such scheme: the UTRAN transport channel synchronization mechanism that is under the soft changing state of 3GPP regulation of standard can run into some insurmountable problems, make subscriber equipment can only receive the data of one of them cell base station, Internet resources are caused waste.
Cause the main cause of this situation to be, base station controller with its physically the measuring control information of neighbor cell send to subscriber equipment, subscriber equipment is according to the cell measurement that the cell information that provides in the control messages is used for soft handover is provided.But in present actual networking,, cause the propagation delay time difference of Iub interface owing to the Iub interface transmission medium difference that adopt different base stations.For example some base station adopts E1 directly to transmit, and some base station is then by multiple transmission mediums such as WLAN, microwave, ADSL, satellites.The propagation delay time that these transmission mediums are introduced is compared with standard E1, has a few tens of milliseconds or hundreds of millisecond not to wait.Therefore, under the very big situation of the difference of two base stations and base station controller propagation delay time, the UTRAN transport channel synchronization mechanism that is under the soft changing state of 3GPP regulation of standard can run into some insurmountable problems, make the subscriber equipment that is in soft handover also can only receive the data of one of them cell base station, thereby caused the soft handover waste of network resources.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method that reduces soft switching resource consumption, makes when the difference of time delay is big between each base station and base station controller, saves the Internet resources of soft handover.
For achieving the above object, the invention provides a kind of method that reduces soft switching resource consumption, comprise following steps:
The A base station controller measure and each subordinate's cell base station between propagation delay time, and judge each to the difference of the propagation delay time of the base station of neighbor cell whether greater than the thresholding that presets, if then write down this sub-district is forbidden switching cell each other;
The described base station controller of B is inquired about the described record of forbidding switching cell before generation sends to the measurement control messages of subscriber equipment, only comprise the neighbor cell of not forbidding handoff relation with current area in this message;
The cell measurement of soft handover is provided according to the cell information that provides in the described measurement control messages the described subscriber equipment of C.
Wherein, in the described steps A, the propagation delay time between described base station controller pair and each subordinate's cell base station takes multiple measurements, with the average of measured value repeatedly as The ultimate results.
In this external described method, in the described steps A, the network planning information that described base station controller basis presets is as judging the adjacent foundation in sub-district.
In this external described method, described steps A also further comprises following substep:
Described base station controller will forbid each other that the relevant information of switching cell charges to daily record.
In this external described method, described steps A also further comprises following substep:
Described base station controller will forbid each other that the relevant information of switching cell reports operation maintenance center.
In this external described method, described steps A can be periodically to carry out.
In this external described method, described thresholding can be set in advance in described base station controller by operation maintenance center.
In this external described method, described method can be applicable to broadband CDMA system, and wherein, described base station is Node B, and described base station controller is a radio network controller.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, time delay between periodic measurement cell base station and the base station controller, the neighbor cell that the difference of time delay is excessive is set to forbid switching cell mutually, come down to these two physically adjacent sub-districts logically are set to non-conterminous, the cell measurement when having the sub-district of forbidding handoff relation not participate in soft handover with sub-district, the current place of UE.
Difference on this technical scheme has brought comparatively significantly beneficial effect, the Internet resources in the time of promptly can saving soft handover.This is because the process that has during soft handover a grand diversity to merge, grand diversity data from a plurality of neighbor cells can merge on base station controller and UE, used a time window during merging, only the data in this time window just can be participated in merging, and dropping on the outer data of time window can be dropped.The position of time window can be moved, but width is limited, if two cell base stations to the difference serious offense certain limit of the time delay of base station controller, then how the position of time window moves the data that all can only receive from one of them cell base station.Since therefore can't use the data of these two cell base stations simultaneously, not as not doing soft handover, the reason of Internet resources when the present invention that Here it is can save soft handover.
The present invention is an adaptive process, the workload that causes in the time of can reducing the network planning greatly and consider time delay to the influencing of soft handover.
Description of drawings
Fig. 1 is the structural representation of UMTS system in the prior art;
Fig. 2 is a UTRAN schematic network structure in the prior art;
Fig. 3 is a UTRAN transport channel synchronization mechanism in the prior art;
Fig. 4 is in the prior art under the soft changing state, UTRAN transport channel synchronization mechanism;
Fig. 5 is the method flow diagram that mark is forbidden switching cell in one embodiment of the present of invention;
Fig. 6 is the method flow diagram of soft handover in one embodiment of the present of invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 5, in step 510, base station controller is measured the propagation delay time between this base station controller and each subordinate's cell base station.Its method of measurement can be utilized the synchronization mechanism between base station controller and the base station.Specifically, when base station controller is sent out a message to a base station, write down the moment Tl of transmission, when this message is received in this base station, write down the moment T2 that receives, send one again and receive the response, and write down the moment T3 that sends.Need to prove, contain the base station in receiveing the response and receive the moment T2 of message and send the moment T3 of receiveing the response that base station controller receives and receive T4 constantly under the postscript, then propagation delay time=(T4-T3)+(T2-T1).In order to make measurement result more reliable, can adopt the method for getting average of repeatedly measuring.Such as base station controller is through repeatedly measuring, and the propagation delay time that obtains is respectively t1, t2, t3 ... tn, the propagation delay time of base station controller and this base station is (t1+t2+t3+ so ... tn)/n.By this method of measurement, base station controller can finally obtain a more accurate propagation delay time between this base station controller and each subordinate's cell base station.
In step 520, base station controller will be noted through the propagation delay time of measuring between resulting each subordinate's cell base station and this base station controller in step 510, for example, and base station controller-base station 1:5 millisecond (ms); Base station controller-base station 2:40ms; Base station controller-base station 3:25ms;
Then, enter step 530, mark is forbidden switching cell in neighbor cell.At first, base station controller is judged the neighbor cell of some sub-districts according to the network planning information that presets.For example, for sub-district A, can judge that according to the network planning information that presets its neighbor cell is sub-district B, sub-district C and sub-district D.Then, according to its device of base stations control of record and the propagation delay time between the cell base station in step 520, obtain each transmission time delay difference to neighbor cell base station and base station controller.At above-mentioned case, base station controller can find the propagation delay time of itself and sub-district A, sub-district B, sub-district C and sub-district D in record.For example, base station controller-sub-district A:5ms; Base station controller-sub-district B:10ms; Base station controller-sub-district C:6ms; Base station controller-sub-district D:40ms.So, the transmission time delay difference of neighbor cell A and B is 5ms, and the transmission time delay difference of neighbor cell A and C is 1ms, and the transmission time delay difference of neighbor cell A and D is 35ms.At last, according to the transmission time delay difference of resulting neighbor cell, judge whether this forbids switching cell each other to the sub-district.Specifically, can set in advance a thresholding, when certain, then writes down this sub-district is forbidden switching cell each other during greater than this thresholding the transmission time delay difference of neighbor cell.Wherein, this thresholding can be provided with by operation maintenance center and set in advance in base station controller.At above-mentioned case, if the thresholding that sets in advance is 15ms, so because the transmission time delay difference of neighbor cell A and D is 35ms, greater than this thresholding, base station controller will be labeled as sub-district A and D forbids switching cell.
In step 540 and 550, will forbid that the relevant information of switching cell is charged to daily record and reported (the Operations ﹠amp of operation maintenance center; Maintenance Center is called for short " OMC "), can provide useful information for the later network optimization.
Need to prove that base station controller can be set the one-period timer, such as, Cycle Length was made as one minute, step 510 to step 530 is done periodic execution, just periodically in neighbor cell mark forbid switching cell.In addition, this method can be applicable to Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access is called for short " WCDMA "), and described cell base station is Node B, described base station controller is radio network controller (Radio Network Controller is called for short " RNC ").More than be that how mark is forbidden the explanation that switching cell is done to base station controller, below mark forbidden that the concrete application of switching cell is further explained.
As shown in Figure 6, in the flow process of soft handover, base station controller sends measures control messages to subscriber equipment.Subscriber equipment is measured control messages according to this again and is carried out cell measurement, carries out soft handover at last.
In step 610, the measurement control messages that base station controller sends to the user only comprises the neighbor cell of not forbidding handoff relation with current area.So in step 620, subscriber equipment is only measured with the current area at this subscriber equipment place and is not forbidden the neighbor cell of handoff relation when being used for the cell measurement of soft handover.In step 630, carry out soft handover according to measurement result.
At above-mentioned case, if subscriber equipment need carry out soft handover when the A of sub-district, the base station controller of sub-district A sends measures control messages to this subscriber equipment.Because being labeled as sub-district A and sub-district D, base station controller forbids switching cell, so, send to the cell information that has only sub-district B and sub-district C in the measurement control messages of subscriber equipment.That is to say that when being used for the cell measurement of soft handover, only energy measurement is to the cell information of sub-district B and sub-district C at the subscriber equipment of sub-district A.At last, subscriber equipment also can only switch to sub-district B or sub-district C when carrying out soft handover.
Mark is forbidden switching cell in neighbor cell, can save the Internet resources of soft handover.This be because, when the difference of two cell base stations and base station controller propagation delay time is excessive, time delay when arriving base station controller from the signal of two cell base stations all can the overtime window width, adjust the time window position that is used to receive grand diversity this moment in any case, subscriber equipment can only be received the data of one of them cell base station, and the Internet resources of soft handover are caused waste.By switching cell is forbidden in the neighbor cell setting each other, just logically be set to two physically adjacent sub-districts non-conterminous.In sending to the measurement control messages of subscriber equipment, do not comprise the neighbor cell of forbidding handoff relation is arranged with current area, when subscriber equipment carries out the cell measurement of soft handover according to the cell information that is provided in this measurement control messages again, just can not cause waste to Internet resources.
Though by with reference to some preferred embodiment of the present invention, the present invention is illustrated and describes, those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (8)
1. a method that reduces soft switching resource consumption is characterized in that, comprises following steps:
The A base station controller measure and each subordinate's cell base station between propagation delay time, and judge each to the difference of the propagation delay time of the base station of neighbor cell whether greater than the thresholding that presets, if then write down this sub-district is forbidden switching cell each other;
The described base station controller of B is inquired about the described record of forbidding switching cell before generation sends to the measurement control messages of subscriber equipment, only comprise the neighbor cell of not forbidding handoff relation with current area in this message;
The cell measurement of soft handover is provided according to the cell information that provides in the described measurement control messages the described subscriber equipment of C.
2. the method for minimizing soft switching resource consumption according to claim 1, it is characterized in that, in the described steps A, the propagation delay time between described base station controller pair and each subordinate's cell base station takes multiple measurements, with the average of measured value repeatedly as The ultimate results.
3. the method for minimizing soft switching resource consumption according to claim 1 is characterized in that, in the described steps A, the network planning information that described base station controller basis presets is as judging the adjacent foundation in sub-district.
4. the method for minimizing soft switching resource consumption according to claim 1 is characterized in that, described steps A also further comprises following substep:
Described base station controller will forbid each other that the relevant information of switching cell charges to daily record.
5. the method for minimizing soft switching resource consumption according to claim 1 is characterized in that, described steps A also further comprises following substep:
Described base station controller will forbid each other that the relevant information of switching cell reports operation maintenance center.
6. the method for minimizing soft switching resource consumption according to claim 1 is characterized in that, described steps A can be periodically to carry out.
7. the method for minimizing soft switching resource consumption according to claim 1 is characterized in that, described thresholding can be set in advance in described base station controller by operation maintenance center.
8. according to the method for each described minimizing soft switching resource consumption in the claim 1 to 7, it is characterized in that described method can be applicable to broadband CDMA system, wherein, described base station is NodeB, and described base station controller is a radio network controller.
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| CNB2005100278906A CN100396155C (en) | 2005-07-19 | 2005-07-19 | Method for reducing soft switching resource consumption |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011020382A1 (en) * | 2009-08-19 | 2011-02-24 | 中兴通讯股份有限公司 | Method and device for preventing switching user to cell in barred state |
| CN101159959B (en) * | 2007-11-15 | 2011-04-13 | 华为技术有限公司 | Method, device and system of cell measurement |
| CN102238614A (en) * | 2010-05-05 | 2011-11-09 | 中兴通讯股份有限公司 | Method for selecting candidate cell for terminal in multi-cell coverage and network element |
| WO2012151835A1 (en) * | 2011-07-07 | 2012-11-15 | 中兴通讯股份有限公司 | Method and device for performing neighboring cell handover and reporting measurement information |
| CN104053195A (en) * | 2014-06-30 | 2014-09-17 | 京信通信系统（中国）有限公司 | Method and device for determining members of blacklist |
Family Cites Families (6)
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| CA2278830A1 (en) * | 1998-08-31 | 2000-02-29 | Lucent Technologies Inc. | Handoffs in extended range concentric cell base station |
| CN1230033C (en) * | 2001-02-13 | 2005-11-30 | 艾利森电话股份有限公司 | Handover in shared radio access network environment using subscriber-dependent neighbor cell lists |
| US7197318B2 (en) * | 2001-04-26 | 2007-03-27 | Nokia Corporation | Method and network element for controlling handover |
| CN1679367A (en) * | 2003-06-27 | 2005-10-05 | 三菱电机株式会社 | Mobile communication system, mobile device and network high-end device |
| KR100575942B1 (en) * | 2003-07-24 | 2006-05-02 | 삼성전자주식회사 | Method for delete neighbor cell list at ststem deact |
| KR100548399B1 (en) * | 2003-08-08 | 2006-02-02 | 엘지전자 주식회사 | Hand-off method in a mobile telecommunication terminal equipment |
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2005
- 2005-07-19 CN CNB2005100278906A patent/CN100396155C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159959B (en) * | 2007-11-15 | 2011-04-13 | 华为技术有限公司 | Method, device and system of cell measurement |
| WO2011020382A1 (en) * | 2009-08-19 | 2011-02-24 | 中兴通讯股份有限公司 | Method and device for preventing switching user to cell in barred state |
| CN102238614A (en) * | 2010-05-05 | 2011-11-09 | 中兴通讯股份有限公司 | Method for selecting candidate cell for terminal in multi-cell coverage and network element |
| WO2011137698A1 (en) * | 2010-05-05 | 2011-11-10 | 中兴通讯股份有限公司 | Method and network element for selecting candidate cells for terminal covered by multiple cells |
| CN102238614B (en) * | 2010-05-05 | 2014-03-19 | 中兴通讯股份有限公司 | Method for selecting candidate cell for terminal in multi-cell coverage and network element |
| WO2012151835A1 (en) * | 2011-07-07 | 2012-11-15 | 中兴通讯股份有限公司 | Method and device for performing neighboring cell handover and reporting measurement information |
| CN104053195A (en) * | 2014-06-30 | 2014-09-17 | 京信通信系统（中国）有限公司 | Method and device for determining members of blacklist |
| CN104053195B (en) * | 2014-06-30 | 2018-03-27 | 京信通信系统（中国）有限公司 | A kind of method and device for determining blacklist list member |
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