CN100366126C - Method for selecting non-common frequency measurement neighbouring region to make measurement - Google Patents
Method for selecting non-common frequency measurement neighbouring region to make measurement Download PDFInfo
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Abstract
The present invention discloses a measurement method through selecting non-common frequency measurement adjacent regions, which is applied to code division multiple access mobile communication systems. The present invention comprises steps: A. a base station controller constructs a reference cell collection, wherein each cell in the reference cell collection comprises a current resident cell of a mobile station or a cell of an active collection and other reference cells of a common frequency, and the reference cells of a common frequency are cells which are selected from a common frequency measurement report submitted by the mobile station and satisfy the goal value of quality; B. a non-common frequency measurement cell collection is generated according to the intersections of non-common frequency adjacent cells in the cells of the reference cell collection; C. the generated non-common frequency measurement cell collection is delivered to the mobile station, and the mobile station initiates non-common frequency measurement for the cells in the non-common frequency measurement cell collection. When the method of the present invention is used, the number of measured non-common frequency cells can be reduced, the processing capacity of the mobile station is saved, and accurate non-common frequency switching target cells are obtained.
Description
Technical field
The present invention relates to CDMA mobile communication systems, relate in particular to a kind of method of selecting non-common frequency measurement neighbouring region to make measurement.
Background technology
In the existing cell mobile communication systems,, need make that the radio-frequency power of base station is confined within certain scope (sub-district) in the system for the utilance that improves frequency spectrum resource and the capacity of whole system.Enter the another one sub-district when travelling carriage leaves a sub-district, the signal of the original sub-district that this travelling carriage received inevitable more and more a little less than, and the signal that enters the sub-district that it receives is also just more and more stronger.In order to keep the communication quality of travelling carriage, must switch to the stronger base station of signal that newly enters by original base station to continuing of this travelling carriage, the notion of switching in Here it is the cellular mobile system.
The strategy that switches has strategies such as network control switching, Mobile Assisted Handover, travelling carriage control switching.The strategy that initial cell mobile communication systems generally adopts network control to switch.And the system that upgrades all adopts the strategy of Mobile Assisted Handover as systems such as GSM, IS-95.In the 3G-WCDMA system, also adopt the strategy of Mobile Assisted Handover.
In the strategy of Mobile Assisted Handover, travelling carriage and base station are respectively to the quality such as RSSI (the Received Signal Strength Indicator of forward direction and backward channel; Received signal intensity indication), SIR (signal tointerference ratio, signal interference ratio) or BER (Bit error ratio, the error rate) etc. measure, and respectively measurement result are reported network, network based measurement result is carried out switch decision.Therefore, in the strategy of Mobile Assisted Handover, travelling carriage needs constantly to measure the quality of forward channel.
In traditional time division multiple access (TDMA) cell mobile communication systems, time slot of the general every N Time Slot Occupancy of travelling carriage communicates, and is in " free time " state at other time slot.Because general travelling carriage has only a radio-frequency transmitter, so travelling carriage can utilize these idle conditions that target frequency is measured, so that travelling carriage is to the channel conditions of network-reporting target frequency.But, be different from tdma system, in code division multiple access (CDMA) cell mobile communication systems, neighbor cell may use identical frequency, so that carry out soft handover, and different mobile stations is also no longer divided the time slot frequency of utilization.Like this for the travelling carriage in the cdma system, " free time " time measurement target frequency they no longer have in TDMA.Therefore, must adopt the measurement of additive method realization to target frequency.And, can't measure the signal of two different frequencies simultaneously for the travelling carriage that has only a receiver.Know the intensity of alien frequencies signal if desired, just must use downlink compression mode.
At FDD (Frequency division duplex; Frequency Division Duplexing (FDD)) under the pattern, in order to carry out alien frequencies direct-cut operation, FDD to TDD (Time division duplex; The preparation of switching between switching time division duplex) and system need be measured the Target cell that switches.Under the fdd mode of CDMA, if downstream signal takies in time always, then travelling carriage 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 travelling carriage has two cover transceivers, can carry out different-frequency measure very easily, but realize that like this cost is too high.If travelling carriage has only a cover transceiver, just need a kind of mechanism in descending radio frames, to produce certain free time, Here it is compact model.
When using downlink compression mode, if the upstream frequency of travelling carriage is being launched always and measured frequency and upstream frequency between more approaching, then up tranmitting frequency may be disturbed by measured frequency, for the correctness that guarantees to measure, also need up emission, Here it is the uplink compressed mode of stopping this moment.
After starting compact model, travelling carriage is measured alien frequencies or different aims of systems sub-district, and reports base station controller, and base station controller judgement carrying out alien frequencies or different system are switched then.We are referred to as non-switching frequently together with alien frequencies or the switching of different system, and relevant measurement is called non-common frequency measurement, to be different from frequency soft handover together.
The non-handoff procedure of frequency together is made up of measurement control, measurement report, switch decision, switching execution in step.Measure control and be handed down to UE (travelling carriage), wherein comprised the non-homogeneous-frequency adjacent-domain information that needs are measured by RNC (radio network controller).Non-homogeneous-frequency adjacent-domain information is based on cell configuration by the network planning.The current mode that issues the adjacent area mainly contains based on optimum subdistrict with based on the method for active set, is exactly only to issue the non-homogeneous-frequency adjacent-domain that active user's optimum subdistrict is disposed based on the mode of optimum subdistrict; And be exactly the non-homogeneous-frequency adjacent-domain that issues all active set cell of active user based on the mode of active set.
Existing mode has following shortcoming: when non-common frequency measurement adjacent area is a lot, need to consume the disposal ability of UE, especially when UE need start compact model and measures, make and measure insufficiently, often can not get optimum switching target small area sometimes.
Illustrate, when the user is in soft changing state, active set has two sub-districts, and the GSM neighbor cell configuration of sub-district 1 has 25, and sub-district 2 also has 25, and sub-district 1 and 2 unduplicated GSM adjacent areas, sub-district always have 33.If use adjacent area method, to issue 25 adjacent areas during GSM measures and controls and measure based on optimum subdistrict; Need issue 33 GSM adjacent areas and measure and use method based on active set, GSM to measure control.When the GSM adjacent area is a lot, need to consume the disposal ability of UE, especially when UE need start compact model and measures, UE measured too many GSM adjacent area in limited compact model space, make that measurement is insufficient, often can not get optimum switching target small area sometimes.
As shown in Figure 1, there are GSM-1, GSM-2, GSM-3, GSM-4, GSM-5, GSM-6 in the GSM adjacent area of WCDMA-1 sub-district, there are GSM-3, GSM-4, GSM-5, GSM-6, GSM-7, the GS side of body-8 in the GSM adjacent area of WCDMA-2 sub-district, and UE is in the soft handover area of WCDMA-1 sub-district and WCDMA-2 sub-district.Current optimum subdistrict is the WCDMA-1 sub-district, if dispose the adjacent area that GSM measures according to optimum subdistrict, 6 GSM adjacent areas is arranged; According to the active set configuration, 8 GSM adjacent areas are arranged then.According to the position of UE, GSM-1, GSM-2, GSM-7, GSM-8 do not need the adjacent area as the GSM measurement but in fact.
Summary of the invention
The present invention proposes the method for the selection non-common frequency measurement neighbouring region to make measurement in a kind of code division multiple access system, reach and reduce non-common frequency measurement number of cells, with disposal ability of saving travelling carriage and the purpose that can obtain the non-more accurately switching target small area of frequency together.
The inventive method comprises the following steps:
A: base station controller is constructed a reference cell collection, the sub-district that described reference cell is concentrated comprises persistent district or the active set cell that travelling carriage is current, and other same reference cell frequently, described other same reference cell frequently is the sub-district of selecting from the same-frequency measure reporting that travelling carriage reports of satisfying quality target value;
B: concentrate the common factor of the non-homogeneous frequency adjacent area of each sub-district to generate non-common frequency measurement cell set according to reference cell;
C: the non-common frequency measurement cell set that will generate is handed down to travelling carriage, by travelling carriage non-common frequency measurement is initiated in the sub-district in this non-common frequency measurement cell set.
According to said method of the present invention, described other may further comprise the steps with the system of selection of reference cell frequently:
A1: the measurement report content of the homogeneous frequency adjacent area that the base station controller storing mobile station reports; Described measurement report content comprises at least on cell id, the measurement report and calling time and measured value of parameters;
A2:, calculate the measurement report content caching time of the homogeneous frequency adjacent area of storage according to calling time on current time in system and the measurement report;
A3: abandon cache-time greater than the maximum report sub-district of effective time;
A4: calculate residue cell signal quality estimated value according to measured value of parameters;
A5: with estimated value greater than the sub-district of setting threshold value as other with reference cell frequently.
According to said method of the present invention, the concrete computational methods of described steps A 4 are: cell signal quality estimated value=measured value of parameters-cache-time * linear coefficient.
According to said method of the present invention, described measured value of parameters comprise Common Pilot Channel received signal code power measurement value and/or Common Pilot Channel signal-to-noise ratio measurements/
According to said method of the present invention, described reference cell concentrate each sub-district put in order for:
If travelling carriage is in non-cell private channel status, then the current persistent district of travelling carriage is at first put into the reference cell collection;
Otherwise, at first the optimum subdistrict in the active set cell is put into the reference cell collection, other active set cell is put into successively;
Put into other again with the frequency reference cell.
According to said method of the present invention, described other same reference cell frequently is according to its cell signal quality estimated value sequence arrangement from big to small that calculates.
According to said method of the present invention, also include the step of setting maximum reference cell collection size, if the reference cell collection is full, then stop to put into other with the frequency reference cell.
According to said method of the present invention, described non-common frequency measurement comprises alien frequencies and/or isosystem measurement.
This method is utilized common-frequency cell signal quality and network planning information, it is non-with the measurement control of switching frequently to select non-homogeneous-frequency adjacent-domain to be used for, this method can reduce the measurement number of non-co-frequency cell, saves the disposal ability of travelling carriage, obtains non-more accurately with the frequency switching target small area.
Description of drawings
Fig. 1 is a GSM adjacent area schematic diagram;
Fig. 2 is the flow chart of the inventive method.
Embodiment
Below in conjunction with accompanying drawing, the solution of the present invention is further elaborated.
Non-common frequency measurement among the present invention comprises alien frequencies and/or isosystem measurement, in carrying out the non-handoff procedure of frequency together, needs to start earlier the measurement of non-homogeneous-frequency adjacent-domain.
In code division multiple access system, travelling carriage can carry the additional measurement report of RACH (Random Access Channel) of adjacent cell when inserting, and this selection for the sub-district provides foundation.And other the time (as under the connection status), can report the signal quality information of adjacent cell by the same-frequency measure reporting in the soft switching process.
UE measures and monitors down public guide frequency channel RSCP (Received Signal CodePower, received signal code power) intensity level or Ec/No (signal to noise ratio) value of concentrating all sub-districts, passes to RNC (base station controller) by uplink RRC (Radio Resource Control) signaling.
Under dedicated channel status, trigger the same-frequency measure reporting (MEASUREMENTREPORT) of soft switching process, report the down public guide frequency channel RSCP intensity level or Ec/No (signal to noise ratio) measured value of the neighbor cell of active set cell.
The measurement report content of current homogeneous frequency adjacent area in RNC buffer memory RAGH (Random Access Channel) measurement report and the same-frequency measure reporting, comprise on cell id, the measurement report call time, relevant parameter measured value information such as (as Common Pilot Channel Ec/No or Common Pilot Channel RSCP).Because time of measurement report is uncertain, and because the moving of user, the measured value of sub-district has ageing, and the use of measurement report need be provided with the maximum report effective time of measurement report.
Referring to Fig. 2, the inventive method concrete steps are as follows:
Step 201: base station controller is constructed a reference cell collection, and the sub-district that described reference cell is concentrated comprises persistent district or the active set cell that UE is current, and other is with the frequency reference cell; Described other same reference cell frequently is the sub-district of selecting from the same-frequency measure reporting that travelling carriage reports of satisfying quality target value.
If UE is in non-CELL _ DCH (cell private channel) state, then at first that UE is current persistent district is put into reference cell and is concentrated;
If UE is in the CELL_DCH state, there is active set cell, then at first the optimum subdistrict in the active set cell is put into reference cell and concentrated; Other active set cell is put into successively.
Concrete system of selection with the frequency reference cell is as follows:
The measurement report content of the homogeneous frequency adjacent area that the base station controller storing mobile station reports; Described measurement report content comprises at least and calling time on cell id, the measurement report and the relevant parameter measured value;
According to calling time on current time in system and the measurement report, calculate the measurement report content caching time of the homogeneous frequency adjacent area of storage;
Abandon cache-time greater than the maximum report sub-district of effective time;
Calculate residue sub-district current demand signal quality estimated value according to the relevant parameter measured value: cell signal quality estimated value=relevant parameter measured value (Common Pilot Channel Ec/No)-cache-time * linear coefficient;
With estimated value greater than the sub-district of setting threshold value as with the frequency reference cell.
With the same frequency reference cell that obtains according to cell signal quality estimated value sequence arrangement from big to small.
Can carry out according to following principle during the content of the homogeneous frequency adjacent area that base station controller reports at storing mobile station:
At first, abandon measured value less than the reporting subdistrict of setting threshold value;
And, according to the measurement report content of measured value sequential storage residue sub-district from high to low.
Reference cell concentrates the discharging of each sub-district to be in proper order:
If travelling carriage is in sub-district private network channel (CELL_DCH) state, then the current persistent district of travelling carriage is at first put into the reference cell collection;
Otherwise, at first the optimum subdistrict in the active set cell is put into the reference cell collection, other active set cell is put into successively;
Put into other again with reference cell frequently, full or handle till the measurement report of homogeneous frequency adjacent area of all storages up to the reference cell collection.
After reference cell collection structure is finished, carry out step 202.
Step 202: concentrate the common factor of the non-homogeneous frequency adjacent area of each sub-district to generate non-common frequency measurement cell set according to reference cell.
Now generating the isosystem measurement cell set with the common neighbor cell in reference cell collection sub-district is that example describes, and the generation method of other non-co-frequency cells is similar.The actual number of supposing " reference cell collection " sub-district is n, then chooses the common different system neighbor cell of this n reference cell as the isosystem measurement sub-district.
Still Figure 1 shows that example explanation: current reference cell collection sub-district has 2, is WCDMA-1, WCDMA-2 according to putting in order of signal quality estimation values, and the adjacent different system cell of sub-district WCDMA-1 has { GSM-1, GSM-2, GSM-3, GSM-4, GSM-5, GSM-6}, the adjacent different system cell of sub-district WCDMA-2 has { GSM-3, GSM-4, GSM-5, GSM-6, GSM-7, GSM-8}.
The operation that generates the isosystem measurement cell set is as follows:
Obtain the isosystem measurement cell set according to the common factor of the adjacent different system cell of sub-district WCDMA-1, WCDMA-2 and be { GSM-3, GSM-4, GSM-5, GSM-6}.
Alien frequencies, isosystem measurement cell operation can carry out simultaneously.
Step 203: UE is handed down to by corresponding measurement control in above-mentioned non-common frequency measurement sub-district, and UE initiates non-common frequency measurement operation.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (8)
1. method of selecting non-common frequency measurement neighbouring region to make measurement is applied to may further comprise the steps in the CDMA mobile communication systems:
A: base station controller is constructed a reference cell collection, the sub-district that described reference cell is concentrated comprises persistent district or the active set cell that travelling carriage is current, and other same reference cell frequently, described other same reference cell frequently is the sub-district of selecting from the same-frequency measure reporting that travelling carriage reports of satisfying quality target value;
B: concentrate the common factor of the non-homogeneous frequency adjacent area of each sub-district to generate non-common frequency measurement cell set according to reference cell;
C: the non-common frequency measurement cell set that will generate is handed down to travelling carriage, by travelling carriage non-common frequency measurement is initiated in the sub-district in this non-common frequency measurement cell set.
2. the method for claim 1 is characterized in that: described other may further comprise the steps with system of selection of reference cell frequently:
A1: the measurement report content of the homogeneous frequency adjacent area that the base station controller storing mobile station reports; Described measurement report content comprises at least on cell id, the measurement report and calling time and measured value of parameters;
A2:, calculate the measurement report content caching time of the homogeneous frequency adjacent area of storage according to calling time on current time in system and the measurement report;
A3: abandon cache-time greater than the maximum report sub-district of effective time;
A4: calculate residue cell signal quality estimated value according to measured value of parameters;
A5: with estimated value greater than the sub-district of setting threshold value as other with reference cell frequently.
3. method as claimed in claim 2 is characterized in that: the concrete computational methods of described steps A 4 are: cell signal quality estimated value=measured value of parameters-cache-time * linear coefficient.
4. method as claimed in claim 3 is characterized in that: described measured value of parameters comprises Common Pilot Channel received signal code power measurement value and/or Common Pilot Channel signal-to-noise ratio measurements.
5. method as claimed in claim 4 is characterized in that: described reference cell concentrate each sub-district put in order for:
If travelling carriage is in non-cell private channel status, then the current persistent district of travelling carriage is at first put into the reference cell collection;
Otherwise, at first the optimum subdistrict in the active set cell is put into the reference cell collection, other active set cell is put into successively; Put into other again with the frequency reference cell.
6. method as claimed in claim 5 is characterized in that: described other same reference cell frequently is according to its cell signal quality estimated value sequence arrangement from big to small that calculates.
7. method as claimed in claim 6 is characterized in that: also include the step of setting maximum reference cell collection size, if the reference cell collection is full, then stop to put into other with the frequency reference cell.
8. the method for claim 1, it is characterized in that: described non-common frequency measurement comprises alien frequencies and/or isosystem measurement.
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Families Citing this family (10)
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| CN101094482B (en) * | 2006-06-23 | 2011-08-10 | 华为技术有限公司 | Method and system for measuring parameters in channels of neighboring areas |
| CN100446623C (en) * | 2006-08-02 | 2008-12-24 | 华为技术有限公司 | OTDOA positioning method and equipment |
| CN101159985B (en) * | 2007-11-01 | 2010-11-10 | 中兴通讯股份有限公司 | Overload control method and device for control channel of wireless communication system |
| CN101252760B (en) * | 2008-04-10 | 2011-03-02 | 中兴通讯股份有限公司 | Same frequency measuring case evaluating method |
| CN101505172B (en) * | 2009-03-13 | 2013-01-16 | 中兴通讯股份有限公司 | Mobile terminal measurement method and apparatus in multi-carrier time-division synchronous CDMA system |
| CN102083161A (en) * | 2009-11-30 | 2011-06-01 | 中国移动通信集团广西有限公司 | Method, system for updating cell in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) network and user equipment |
| CN102740349B (en) * | 2011-04-07 | 2015-06-10 | 联发科技（新加坡）私人有限公司 | Terminal measurement scheduling method and device |
| CN107005870B (en) * | 2015-04-10 | 2020-06-23 | 陕西英苑信息技术有限公司 | Method and device for reporting measurement result |
| CN106332136A (en) * | 2016-08-24 | 2017-01-11 | 上海华为技术有限公司 | Data processing method and wireless network controller |
| CN115347995B (en) * | 2022-08-11 | 2023-10-27 | 哲库科技(北京)有限公司 | Measurement position configuration method, device, terminal and storage medium |
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