CN1753561A - Control method of different frequency different system switchover - Google Patents
Control method of different frequency different system switchover Download PDFInfo
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Abstract
This invention discloses a method for controlling the switch of different frequencies and systems, which can carry out measurement and switch judgment when the adjacent areas of different frequencies and different systems exist at the same time and control the usage of compressed mode effectively to avoid over large influence on the system performance. First of all, the network selects one of the two measurements and starts the other one after the preset time length is over and it has not received the measurement report meeting the switch condition.
Description
Technical field
The present invention relates to mobile communication technology, particularly alien frequencies in the mobile communication system and different system switching controls.
Background technology
Along with advancing by leaps and bounds of cellular mobile communication technology, analog and digital cell mobile communication systems has appearred successively, entered at present with " multimedia, personalization at a high speed, " is the developing stage of the 3G (Third Generation) Moblie (The Third Generation is called for short " 3G ") of characteristics.
In all cellular mobile communication technologies, switch and all be and important part, specifically, as travelling carriage (Mobile Station, be called for short " MS ") when leaving a sub-district and entering the another one sub-district, the signal of the original sub-district that this MS is received inevitable more and more a little less than, and its received signal that enters the sub-district will be more and more stronger just also.In order to keep the communication quality of MS, must switch to the stronger base station of signal that newly enters by original base station to continuing of this MS.
Mainly contain following three kinds of switchover policy at present.
First kind is that network control is switched, and is used for initial cell mobile communication systems; Second kind is the auxiliary switching of MS, be used for such as global system for mobile communications (Global System for mobileCommunication, be called for short " GSM "), the system that IS-95 system etc. upgrade, and 3G-Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, be called for short " WCDMA ") system, in this switchover policy, MS and base station are respectively to the quality of forward direction and backward channel, such as received field strength indication (Receiving Signal Strength Indicator, be called for short " RSSI "), signal-to-jamming ratio (Signal to Interference Ratio, be called for short " SIR "), bit error rate (Bit Error Rate, be called for short " BER ") etc. measure, and respectively measurement result being reported network, network based measurement result is carried out switch decision.Therefore, in the auxiliary strategy that switches of MS, MS needs constantly to measure the quality of forward channel.Also have a kind of MS of being control to switch.
The difference of time division multiple access (Time DivisionM ultiple Access is called for short " TDMA ") system and cdma system is described below.
In traditional tdma system, time slot of the general every N Time Slot Occupancy of MS communicates, and is in " free time " state at other time slot.Because general MS only has a radio-frequency transmitter, so MS can utilize these idle conditions that target frequency is measured, so that MS is to the channel conditions of network-reporting target frequency.
In cdma system, neighbor cell may use identical frequency, so that carry out soft handover, and different MS is also no longer divided the time slot frequency of utilization.For the MS in the cdma system, " free time " that they no longer have resembling among the TDMA comes the measurement target frequency like this.
This shows, in cdma system, need to adopt " idle time slot " other modes in addition that target frequency is measured on the one hand, on the other hand,, also need to manage to know the intensity of alien frequencies signal if MS has only a receiver.In this case, must use downlink compression mode.
Further the application and the implementation method of compact model is described below.
Compact model is crucial for cellular mobile communication.For instance, at optical fiber substep data-interface (FIBER DISTRIBUTED DATA INTERFACE, abbreviation " FDDI ") under the pattern, in order to carry out alien frequencies direct-cut operation, optical fiber substep data-interface (FIBER DISTRIBUTEDDATA INTERFACE, be called for short " FDDI ") to time-division duplex (Time Division Duplex, be called for short " TDD ") switch and such as CDMA to the preparation of switching between gsm system, need measure the Target cell that switches.Under the CDMA fdd mode, if downstream signal takies in time always, then MS will receive descending data continuously, and its receiver just can not receive the signal of other frequencies when receiving the work at present frequency signal.If MS carries out different-frequency measure by two cover transceivers, can cause cost too high; But,, just need a kind of mechanism that can in descending radio frames, produce certain idle time slot, compact model promptly mentioned above if MS has only a cover transceiver.
Compact model is used very general in cellular mobile communication.For example, in cdma system, before portable terminal carried out the alien frequencies direct-cut operation, network can require MS to carry out different-frequency measure, promptly might need to start the signal that compact model is measured adjacent alien-frequency district.In the different-frequency measure, portable terminal is initiated the signal to noise ratio (Ec/No) of contiguous alien-frequency district pilot channel or the measurement of RSCP (letter of acceptance number power), and measuring needs to use a compressed mode pattern.
Again for example, before switching to gsm system from cdma system, network can require portable terminal to carry out isosystem measurement, for switch decision between system is submitted necessary information.Because the frequency of gsm system is inequality, also may need to start the frequency signal of compact model measure neighbor GSM sub-district.
This process can be divided into three phases.
In first stage, MS initiates the measurement to contiguous GSM CBCH RSSI; Second stage, MS selects wherein 8 the strongest base stations of RSSI, catches synchronization burst (SynchronizationBurst is called for short " SB "), decode base station identity code (Base Station Identify Code is called for short " BSIC ") and GSM sub-district observed time difference information; Three phases successfully obtains constantly to reaffirm behind the BSIC value of BSIC, in order to avoid BSIC changes, and upgrades GSM sub-district observed time difference information.
More than three processes be called that GSM rssi measurement, initial BSIC are confirmed to measure, BSIC heavily confirms to measure.It is pointed out that these three kinds of measurements use three different compressed mode pattern respectively.
The essence of compact model is the transmission " space " that forms a period of time by technology such as sign indicating number punchings in radio frames, and in this section space, any data are not transmitted to MS in the base station.Thus, MS can be transformed into radio-frequency transmitter the target frequency that needs supervision, and target frequency is measured.Fig. 1 illustrates the parameter of compressed mode pattern (Pattern).As can be seen, the size in transmission space (TG) and the length of relative position and pattern have determined a compressed mode pattern.
After it is pointed out that the commercialization of 3G-CDMA system, because existing 2G network can not all be upgraded to 3G network simultaneously, the therefore situation that is certainly existing 3G network and 2G network in one period and depositing.The purpose of switching between system is exactly to wish and can provide good quality of service for user's communications at the borderline region of different system, and switch between system and will become indispensable functional requirement this moment.Simultaneously, owing to have the alien frequencies neighbor cell in the cdma system, so the alien frequencies direct-cut operation also exists simultaneously.
Problem is, in the document of existing correlation technique, need use compact model to carry out different-frequency measure though propose the alien frequencies direct-cut operation that MS carries out in the cdma system respectively, and will use compact model to carry out the GSM measurement before cdma system switches to gsm system, and three processes that GSM measures are used three kinds of different compressed mode pattern respectively.But, do not exist simultaneously under the situation at alien frequencies and different system neighbor cell, how to measure and how to carry out explanation and the announcement that switch decision is correlated with.
On the other hand, compact model causes carrying out compact model repeatedly and reshuffles if use frequently, will increase the burden of command transmitting and the complexity of control, thereby increases the influence to systematic function.Like this, must cause bad influence to the performance of system.This shows that in cdma system, it is most important to reduce its influence to systematic function by the usage frequency that reduces compact model.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of control method of different frequency different system switchover, not only can exist simultaneously under the situation and measure and switch decision at alien frequencies and different system neighbor cell, and can effectively control the use of compact model, thereby avoid it that systematic function is produced excessive influence.
For achieving the above object, the invention provides a kind of control method of different frequency different system switchover, comprise following steps:
A when network measuring when needs start alien frequencies and different system and switch, select to start different-frequency measure or isosystem measurement;
B starts the measurement of selecting, and starts corresponding measurement timer simultaneously;
C waits for, until receiving that before corresponding measurement timer is overtime the measurement report or the described measurement timer that satisfy switching condition are overtime, and
If before described measurement timer is overtime, receive the measurement report that satisfies switching condition then stop described measurement timer, switch;
If described measurement timer is overtime, then selects to start another kind of the measurement, and enter step B.
Wherein, in described steps A,, select to start different-frequency measure or isosystem measurement according to a kind of in pre-configured boot sequence switch, UE ability and the UE service attribute or their combination in any.
Described steps A also comprises following substep:
A1 judges whether the measurement boot sequence switch that sets in advance specifies switching priority, if, then start the pairing measurement of the higher switching of priority, otherwise, steps A 2 entered;
A2 according to the UE ability judge alien frequencies or isosystem measurement whether all needs start corresponding compact model, if, then enter steps A 3, otherwise, optionally in the measurement that does not need to start corresponding compact model start a measurement;
A3 starts different-frequency measure or isosystem measurement according to the service handover information element content choice in the RAB assignment message in the service attribute.
When one of satisfied following at least condition, network determines to need to start alien frequencies and different system is switched:
UE communication quality on current frequency is poor, and the signal of alien frequencies or different system is better;
Network side has started load balance, has specified this UE to switch to alien frequencies or different system.
Described step B also comprises following substep:
B1 judges whether that according to the UE ability needs start the corresponding compact model of described measurement, if then enter step B2, otherwise enter step B3;
B2 starts the corresponding compact model of described measurement, and enters step B3;
B3 starts described measurement.
Among the described step B2, when being measured as isosystem measurement, also comprise following substep when described:
Dispose simultaneously and activate that rssi measurement, initial BSIC are confirmed to measure, BSIC heavily confirms three compressed mode pattern measuring.
Described compressed mode transmissions space pattern length desirable 12 or 24 frames.
Among the described step B2, when being measured as isosystem measurement, also comprise following substep when described:
Dispose and activate rssi measurement, two compressed mode pattern of initial BSIC affirmation measurement simultaneously.
Among the described step B2, when described when being measured as isosystem measurement, also comprise configuration and activate the substep of a compressed mode pattern of rssi measurement.
By relatively finding, technical scheme difference with the prior art of the present invention is, network based actual conditions, select to start a kind of measurement in different-frequency measure or the isosystem measurement earlier, and surpassing the scheduled measurement time span, be that measurement timer is overtime, and after not receiving the measurement report that satisfies switching condition, select to start another kind of the measurement.
Difference on this technical scheme has brought comparatively significantly beneficial effect, at first, to alien frequencies and the different system simultaneous situation in adjacent area, can Serial Control measure and switch decision.Secondly, for the parallel mode that starts alien frequencies and isosystem measurement simultaneously,, only start a kind of compact model at every turn, thereby make and reduce the influence of compact model widely systematic function because the present invention measures serially.
Description of drawings
Fig. 1 is a compressed mode pattern argument structure schematic diagram of the prior art;
Fig. 2 is the schematic flow sheet of control method of different frequency different system switchover according to an embodiment of the 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 2, at first in step 200, system need to judge whether the different system of alien frequencies to switch.Specifically, when one of satisfied following at least condition, network determines to need to start alien frequencies and different system is switched, and a kind of is subscriber equipment (User Equipment, being called for short " UE ") communication quality is poor on current frequency, and the signal of alien frequencies or different system is better; A kind of is that network side has started load balance, has specified this UE to switch to alien frequencies or different system.
Need to start alien frequencies or the switching of different system if network is thought, then enter the different system of alien frequencies and switch the Serial Control flow process, promptly enter following step 210, otherwise do not enter this control flow.
Then, in step 210, system is according to measuring boot sequence switch, travelling carriage (MobileStation is called for short " MS ") ability information and customer service attribute, and judgement is to start alien frequencies earlier or start different system earlier.
Specifically, in this deterministic process, measurement boot sequence switch is at first judged by system, preferentially switches to alien-frequency district if this boot sequence switch explicitly calls for, and then directly enters step 220; If the boot sequence switch explicitly calls for and preferentially switches to different system cell, then enter step 280; If the boot sequence switch is not specified the priority of switching, then judge according to the ability information of MS; If the ability information of MS does not need to start the alien frequencies compact model, then preferentially switch to alien-frequency district, promptly enter step 220; If the ability information of MS does not need to start different system compresses pattern, then preferentially switch to different system cell, enter step 280; If the both need start compact model, then determine the boot sequence of measurement according to user's service attribute; If RAB (Radio Access Bearer, abbreviation " RAB ") serves handover information element (Service Handover IE) in the assignment message and be " shouldnot be handed over to GSM " or " shall not be handed over to GSM ", then enter step 220, start different-frequency measure earlier; If Service Handover IE is " should be handed overto GSM ", then enter step 280 subsequently, start isosystem measurement earlier.
In step 220, system start-up different-frequency measure timer.Need to prove that this measurement timer is for fear of in official hour, when the signal of alien-frequency district can not satisfy requiring of switching, the system that makes can start the measurement of different system.Subsequently, enter step 230.
In step 230～250, finish the startup of alien frequencies compact model and the foundation of measurement.
Specifically, in step 230, system need to judge whether compact model according to the ability information of MS, need to start the alien frequencies compact model if judge, then enter step 240, start the different-frequency measure compact model, activate Frequency Division Duplexing (FDD) (Frequency Division Duplex, abbreviation " FDD ") compressed mode pattern of measuring, after the compression mode starting success, send different-frequency measure message, after this enter step 250 again; Do not need to start the alien frequencies compact model if judge the ability information of MS, then directly enter step 250.
In step 250, start different-frequency measure, directly send different-frequency measure message.After this, enter step 260.
In step 260, wait for, receive the measurement report that satisfies switching condition until earlier, or this measurement timer is overtime.Need to prove, as shown in the figure,, just show after isosystem measurement does not satisfy condition and restart different-frequency measure,, at this moment do not need to carry out any processing at this situation if this moment, the different-frequency measure measurement timer was not activated; Before it is not overtime, receive the measurement report that satisfies switching condition if the different-frequency measure timer has started, then during this period of time can handle different-frequency measure reporting, enter following step 270; If the different-frequency measure timer is overtime, need stops different-frequency measure and close the alien frequencies compact model, and forward in the step 290.
In step 270, carry out the enforcement of the judgment of different-frequency measure reporting.At this moment, for the different-frequency measure reporting that satisfies the alien frequencies switching condition, court verdict switches for carrying out alien frequencies, is about to MS and switches to the alien frequencies adjacent area; If receive the response message of success, then finish this flow process, and continue to wait for that MS reports the different-frequency measure result.
Need to prove, if different-frequency measure with the signal-to-noise power density ratio (Ec/No) of district pilots channel as measuring amount, then alien frequencies handoff threshold scope be-24dB is to 0dB; If different-frequency measure with the letter of acceptance number power of district pilots channel (Received Signal Code Power is called for short " RSCP ") as measuring amount, then alien frequencies handoff threshold scope should be-115dBm is to 0dBm.
Next, the situation of selecting to start isosystem measurement earlier is described.
As mentioned above, when judging in the step 210 that starting different system earlier switches, enter step 280.In this step, start the isosystem measurement timer, the isosystem measurement timer here, be for fear of in official hour, signal at different system cell can not satisfy requiring under the situation of switching, starts different-frequency measure, and this function with above-mentioned different-frequency measure timer is consistent.Subsequently, enter step 290.
In step 290～310, start different system compresses pattern, and set up and measure.
Specifically, in step 290,, need to judge whether compact model according to the ability information of MS.If judging needs to start different system compresses pattern, then enter step 300, activate the compressed mode pattern that GSM measures, and after the compression mode starting success, in step 310 subsequently, start isosystem measurement, send isosystem measurement message; Do not need to start different system compresses pattern if judge the ability information of MS, then directly enter and send isosystem measurement message in the step 310, start isosystem measurement.
Here need to prove that the compact model of isosystem measurement need activate described rssi measurement simultaneously, initial BSIC confirms that measurement and BSIC heavily confirm three compressed mode pattern measuring.Many compressed mode pattern sequences confirm that according to rssi measurement, initial BSIC measurement, BSIC heavily confirm the order of measuring simultaneously, its transmission space successively is distributed in the compressed mode pattern length T GPL frame, makes GSM sub-district through rssi measurement enter very soon that BSIC confirms to measure and BSIC heavily confirms measurement.
And, dispose and activate three kinds of compressed mode pattern sequences simultaneously a plurality of transmission space overlapping situation in same frame just may take place.Third generation partner program (3rd Generation PartnershipProject, be called for short " 3GPP ") protocol requirement, when having a plurality of compressed mode pattern sequence-activated simultaneously, must satisfy following condition: (1) guarantees to have at least a frame not to be compressed in continuous three frames; (2) guarantee that the finish time in first transmission space in continuous two condensed frames and the initial moment in second transmission space differ 8 time slots at least.
With reference to Fig. 1, the GSM that recommends from the 3GPP agreement measures compressed mode pattern, and transmission space pattern length (Transmission Gap Pattern Length is called for short " TGPL ") has three kinds of selections: 8 frames, 12 frames or 24 frames.In order to reduce a plurality of transmission space overlapping possibility in same frame, can choose TGPL is 12 or 24 frames.Three compressed mode pattern that are used for isosystem measurement are used for different measurement purposes, can only use rssi measurement, initial BSIC to confirm two compressed mode pattern measuring, even only use a compressed mode pattern of rssi measurement, reduced a plurality of transmission space overlapping possibility in same frame like this.
Next, in step 320, wait for, receive measurement report that satisfies switching condition or isosystem measurement timer expiry until earlier.If started but do not had at the isosystem measurement timer and received the measurement report that satisfies switching condition before overtime, then entered step 330; Otherwise,, then need to stop isosystem measurement and close different system compresses pattern, and forward execution in step 230 to if isosystem measurement is overtime.Need to prove if this fashion of isosystem measurement measurement timer does not start, this just shows it is the isosystem measurement of restarting after different-frequency measure does not satisfy condition, and does not at this moment just need to carry out any processing.
In step 330, isosystem measurement report enforcement of the judgment.In other words, this moment, network received the isosystem measurement report of satisfying switching condition that MS reports, and court verdict switches for carrying out different system, carries out different system and switches, and MS is switched to different system cell.As measuring amount, if then different system handoff threshold scope were isosystem measurement with RSSI-115dBm would be to 0dBm.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (9)
1. a control method of different frequency different system switchover is characterized in that, comprises following steps:
A when network measuring when needs start alien frequencies and different system and switch, select to start different-frequency measure or isosystem measurement;
B starts the measurement of selecting, and starts corresponding measurement timer simultaneously;
C waits for, until receiving that before corresponding measurement timer is overtime the measurement report or the described measurement timer that satisfy switching condition are overtime, and
If before described measurement timer is overtime, receive the measurement report that satisfies switching condition, then stop described measurement timer, switch;
If described measurement timer is overtime, then selects to start another kind of the measurement, and enter step B.
2. control method of different frequency different system switchover according to claim 1, it is characterized in that, in described steps A, according to a kind of in pre-configured boot sequence switch, UE capability and the user apparatus service attribute or their combination in any, select to start different-frequency measure or isosystem measurement.
3. control method of different frequency different system switchover according to claim 2 is characterized in that, described steps A also comprises following substep:
A1 judges whether the measurement boot sequence switch that sets in advance specifies switching priority, if, then start the pairing measurement of the higher switching of priority, otherwise, steps A 2 entered;
A2 according to UE capability judge alien frequencies or isosystem measurement whether all needs start corresponding compact model, if, then enter steps A 3, otherwise, optionally in the measurement that does not need to start corresponding compact model start a measurement;
A3 starts different-frequency measure or isosystem measurement according to the service handover information element content choice in the wireless access load-bearing allocation message in the service attribute.
4. control method of different frequency different system switchover according to claim 1 is characterized in that, when one of satisfied following at least condition, network determines to need to start alien frequencies and different system is switched:
Subscriber equipment communication quality on current frequency is poor, and the signal of alien frequencies or different system is better;
Network side has started load balance, has specified this subscriber equipment to switch to alien frequencies or different system.
5. control method of different frequency different system switchover according to claim 1 is characterized in that, described step B also comprises following substep:
B1 judges whether that according to UE capability needs start the corresponding compact model of described measurement, if then enter step B2, otherwise enter step B3;
B2 starts the corresponding compact model of described measurement, and enters step B3;
B3 starts described measurement.
6. control method of different frequency different system switchover according to claim 5 is characterized in that, among the described step B2, when being measured as isosystem measurement, also comprises following substep when described:
Dispose and activate three compressed mode pattern of received field strength indication measurement, initial base station identification code affirmation measurement, identification of base stations code weight affirmation measurement simultaneously.
7. control method of different frequency different system switchover according to claim 6 is characterized in that, described compressed mode transmissions space pattern length desirable 12 or 24 frames.
8. control method of different frequency different system switchover according to claim 5 is characterized in that, among the described step B2, when being measured as isosystem measurement, also comprises following substep when described:
Dispose and activate received field strength indication measurement, two compressed mode pattern of initial base station identification code affirmation measurement simultaneously.
9. control method of different frequency different system switchover according to claim 5 is characterized in that, among the described step B2, when described when being measured as isosystem measurement, also comprise configuration and activates the substep of a compressed mode pattern of received field strength indication measurement.
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| CN102137422A (en) * | 2010-01-25 | 2011-07-27 | 中国移动通信集团江苏有限公司 | Pilot frequency neighborhood measuring method and device |
| CN101374313B (en) * | 2007-08-22 | 2011-11-09 | 鼎桥通信技术有限公司 | Method for measuring iso system |
| WO2012022050A1 (en) * | 2010-08-20 | 2012-02-23 | 中兴通讯股份有限公司 | Method for controlling compressed mode and system thereof |
| CN101827384B (en) * | 2009-03-06 | 2013-07-10 | 电信科学技术研究院 | Cell handover method and base station |
| CN103327512A (en) * | 2013-06-03 | 2013-09-25 | 北京神州泰岳软件股份有限公司 | Method and system for switching signals rapidly |
| CN103546905A (en) * | 2012-07-09 | 2014-01-29 | 中兴通讯股份有限公司 | Measuring process optimizing method, terminal and base station |
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| CN1208987C (en) * | 1999-02-26 | 2005-06-29 | 高通股份有限公司 | Method and system for handoff between asynchronous CDMA base station and synchronous CDMA base station |
| US6975608B1 (en) * | 1999-10-22 | 2005-12-13 | Utstarcom, Inc. | Method for performing handoff between asynchronous base station and synchronous base station |
| CN1154274C (en) * | 2001-01-11 | 2004-06-16 | 华为技术有限公司 | Control method and device for compression mode in CDMA system |
| CN1154277C (en) * | 2001-06-27 | 2004-06-16 | 华为技术有限公司 | Method for controlling compression mode according to power of mobile station |
| US7313116B2 (en) * | 2002-05-13 | 2007-12-25 | Samsung Electronics Co., Ltd. | Method of performing inter-RAT measurement for a handover from NB-TDD to GSM |
| CN1324828C (en) * | 2002-06-11 | 2007-07-04 | 华为技术有限公司 | Method for switching between different systems in CDMA communication system |
| DE10228885B4 (en) * | 2002-06-27 | 2006-09-21 | T-Mobile Deutschland Gmbh | Method for performing a blind handover for inter-system and inter-frequency handover in mobile communication systems |
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| CN101827384B (en) * | 2009-03-06 | 2013-07-10 | 电信科学技术研究院 | Cell handover method and base station |
| CN102137422A (en) * | 2010-01-25 | 2011-07-27 | 中国移动通信集团江苏有限公司 | Pilot frequency neighborhood measuring method and device |
| CN102137422B (en) * | 2010-01-25 | 2016-01-27 | 中国移动通信集团江苏有限公司 | A kind of alien frequencies adjacent cell measurement method and device |
| WO2012022050A1 (en) * | 2010-08-20 | 2012-02-23 | 中兴通讯股份有限公司 | Method for controlling compressed mode and system thereof |
| CN103069876A (en) * | 2010-08-20 | 2013-04-24 | 中兴通讯股份有限公司 | Method for controlling compressed mode and system thereof |
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| CN103546905A (en) * | 2012-07-09 | 2014-01-29 | 中兴通讯股份有限公司 | Measuring process optimizing method, terminal and base station |
| CN103327512A (en) * | 2013-06-03 | 2013-09-25 | 北京神州泰岳软件股份有限公司 | Method and system for switching signals rapidly |
| CN103327512B (en) * | 2013-06-03 | 2016-04-20 | 北京神州泰岳软件股份有限公司 | A kind of signal fast switch over method and system |
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