CN1805592A - Measurement control method for switching between mobile communication cells - Google Patents
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Abstract
The invention relates to a test control method of mobile communication section switch, which can selectively process common-frequency and different-frequency switches when confirming the user chain circuit quality and the tested UE section number is minimum, and can balance loads between sections in several carrier waves flexibly. The method comprises: wireless network controller RNC receives the test report from the UE which is organized and reported according to the test control information distributed for UE by RNC; when UE reports 1G/1D/2A event, RNC generate switch target section according to the pilot frequency signal test information with general method, from the common-frequency or different-frequency target section provided by the 1G/1D/2A event of UE; when UE reports chain circuit worsen event, the path consumption test reports of common-frequency and/or different-frequency section of at most three base stations that near said UE most should be contained, and UE sets the switch target base station with uniform load and the carrier wave of switch target section according to several path consumption test reports and the section loads of the carrier waves of relative several base stations.
Description
Technical field
The present invention relates to mobile communication technology, is a kind of measurement control method that mobile communication cells switches, obtains target cell information that is used for.
Background technology
Code division multiple access (CDMA) system is the self-interference constrained system, and it disturbs and mainly comprises interference and presence of intercell interference in the sub-district.Interference mainly is self intersymbol interference and multiple access interference in the sub-district, and presence of intercell interference comprises that co-frequency neighbor cell disturbs and disturb the adjacent sub-district (iso-frequency adjacent community) of adjacent carrier.Though identical networking is the basis of 3G network dilatation, big when being embodied on the presence of intercell interference because during identical networking than inter-frequency networking, thus influence the identical networking capacity.
Presence of intercell interference when switching between co-frequency cell as shown in Figure 1: user terminal (UE) is in three positions of A, B, C of cell edge respectively, dotted line a → c → b among its movement locus such as the figure, the user can carry out with the frequency handover operation in the motion, and presence of intercell interference becomes very big near the D point.
In the hard handover scheme of sub-district, if the target adjacent section of direct-cut operation is used identical frequency (promptly with switching frequently) with Serving cell, then the user from the Serving cell edge to the motion process of adjacent sub-district, the signal strength signal intensity that the user receives Serving cell diminishes gradually, but co-channel interference can not diminish, even can increase, cause user chain quality (Ec/Io) to worsen fast.Again because in the hard handover scheme, the time that supplies terminal to switch is very short, the user chain quality that worsens make terminal very easily call drop (and in soft handoff scheme, situation is then different fully, the soft handover mobile phone can merge the two paths of signals of Serving cell and Target cell, produce Ec/Io preferably, thereby guarantee in handoff procedure, can converse reposefully).
Comparatively speaking, adopt different frequency (alien frequencies switching) when direct-cut operation, effect can obviously be improved.Promptly the boundary at Serving cell and Target cell uses different frequency, can improve the success rate of direct-cut operation greatly, and little to original web influence, need not existing network is adjusted, and is implemented in existing network easily, optimizes easy.
According to statistics, under more satisfactory situation, the direct-cut operation success rate can reach 95% between different frequency system, and with frequently between system the handover success rate of direct-cut operation generally between 50-70%.This is because the presence of intercell interference of the presence of intercell interference during the sub-district identical networking during than the sub-district inter-frequency networking is big, and causes being lower than the alien frequencies direct-cut operation with direct-cut operation success rate frequently.
Handoff procedure needs UE in time to report measured district pilots signal strength signal intensity.The district pilots signal strength measurement can reflect the path loss (path loss has reflected the slow fading influence of wireless channel to wireless signal) of pilot signal.In order to reduce unnecessary sub-district switching times as much as possible, system can require terminal to switch to the minimum pairing sub-district of path loss.
The slow fading influence can adopt relevant logarithm normal distribution to produce standard deviation sigma=6.0.Average path loss adopts the cost231_hata model, and then the average path loss formula is as follows:
L(d)＝46.3+33.9logf-13.82logh
te-a(h
re)+(44.9-6.55logh
te)logd+C
M
In the formula, f is a carrier frequency; D is the distance between terminal and base station; h
TeBe the base station height; h
ReBe the terminal height; C
MBe path loss index; A (h
ReThe h of)=(1.1logf-0.7)
Re-(1.56logf-0.8).
The formula of terminal measuring route loss is:
Path loss (dB)=emission power of pilot signal-reception pilot signal strength
Emission power of pilot signal wherein is by providing with information unit (IE)-" Primary CCPCH Tx Power " (tdd mode)/" Primary CPICH Tx power " (fdd mode) in frequency or the different frequency cell information, unit is dBm, and radio network controller (RNC:Radio Network Controler) can be told the emission power of pilot signal of its all adjacent sub-districts of terminal by measuring message.
The unit that receives pilot signal strength is dBm.
By above-mentioned analysis as can be known, when disturbing greatly between co-frequency cell, terminal (UE) is carried out with the success rate of frequency direct-cut operation not high; Terminal then can improve handover success rate if carry out the alien frequencies direct-cut operation at this moment.For this reason, when terminal is carried out the sub-district switching, usually need carry out common frequency measurement and different-frequency measure simultaneously, RNC is according to the measurement result decision employing still alien frequencies switching even the switching of loading of frequency switching together of terminal to report, and load switching wherein is the Target cell according to neighbor cell load condition decision switching.
According to the protocol specification requirement, time division duplex (TDD) system, the adjacent sub-district number that terminal is measured at most comprises: 32 TDD co-frequency cells (containing Serving cell); 32 alien-frequency districts (comprising being distributed in the TDD sub-district on maximum three TDD carrier waves and being distributed in FDD sub-district on maximum three FDD carrier waves) if terminal has this ability; 32 RAT GSM sub-districts (if terminal has this ability).
Frequency Division Duplexing (FDD) (FDD) system, the adjacent sub-district number that terminal is measured at most comprises: 32 FDD co-frequency cells (containing Serving cell); 32 alien-frequency districts (comprising being distributed in the FDD sub-district on maximum two FDD carrier waves and being distributed in TDD sub-district on maximum three TDD carrier waves) if terminal has this ability; In IPDL (Idle Periods in DownLink) interval, can monitor 16 co-frequency cells (if terminal has this ability).
Therefore, no matter be TDD terminal or FDD terminal, its adjacent sub-district number average of measuring the alien frequencies carrier wave is restricted.
If the carrier wave number of adjacent base station support exceeds the ability of the measurement alien frequencies carrier wave that terminal had that protocol specification requires, then terminal can can't be measured the TDD and the FDD alien-frequency district of all existence; And the measurement information in neighbor cell (comprising the information on path loss of terminal measurement) that present terminal carries out all utilizing terminal to measure and report when switch the sub-district generates the target switching cell, therefore can be very limited for the Target cell scope that terminal is switched, promptly can't make full use of the existing resource of system.
If the carrier wave number of adjacent base station support does not exceed the protocol specification requirement, then terminal can be measured all adjacent sub-districts.When terminal utilized the general measure control method to switch, the sub-district number that terminal is measured can be a lot, and the time that at every turn measures all adjacent sub-districts is also very long, and this makes terminal can't in time report measurement information in neighbor cell, thereby reduced the sub-district success rate for switching.
In sum, present sub-district handover measurement control method is not only complicated and impracticable, usually can't balanced effectively flexibly minizone load owing to be subjected to the terminal capability restriction.
Summary of the invention
The objective of the invention is to design the measurement control method that a kind of mobile communication cells switches, terminal still can carry out selectively switching, and improving handover success rate with switching frequently, alien frequencies under the minimum condition of measurement sub-district number to all adjacent sub-districts; And can between a plurality of carrier waves (the carrier wave number is unrestricted), load balanced neatly minizone; Simultaneously, the present invention can also guarantee user's link-quality.
The technical scheme that realizes the object of the invention is: the measurement control method that a kind of mobile communication cells switches, and radio network controller (RNC) receives the measurement report from user equipment (UE), and this measurement report is the measuring control information tissue of UE configuration by RNC and reports; Also comprise:
A. when the UE reporting links worsens event report, also subsidiary several apart from the nearest base station of this UE with frequently with/or the path loss measurement report values of alien-frequency district, and execution in step B; When UE reports the 1G/1D/2A event report, execution in step C;
B.RNC determines the handover-target base station and the corresponding carrier wave of switching target small area of load balancing according to the load of carrier wave on these several path loss measurement report values and the several base stations corresponding with it;
C.RNC generates switching target small area according to pilot signal measurement information from same frequency or alien frequencies Target cell that the 1G/1D/2A incident of UE provides.
In the described steps A, described several apart from UE on the nearest base station with frequently with/or the path loss measurement report values of alien-frequency district, be described UE by one on the desired adjacent base station of measuring system with carrier wave or an alien frequencies carrier wave frequently, resulting at the most three with frequently with/or the minimal path loss value of alien-frequency district; Among the described step B, determine that the handover-target base station of load balancing and the carrier wave of switching target small area correspondence further comprise:
The base station of minimum path loss measurement report values correspondence is defined as handover-target base station in three path loss measurement report values at the most that B1.RNC will obtain;
B2. calculate the load of each carrier wave on this handover-target base station, and sort by size;
The carrier wave of the minimum of B3. will loading is as the carrier wave of described switching target small area correspondence.
Among the described step B2, the load of each carrier wave on the handover-target base station, be by with this handover-target base station upload phase of wave with and comprise calculating of this handover-target base station apart from carrier load sum on nearest three base stations at the most of UE, these at the most three base stations nearest apart from UE are link-quality additional same frequencies that report and/or iso-frequency adjacent community path loss measured value institute base station one to one when worsening.
The load of each carrier wave is periodically calculated by RNC on the described base station, comprising:
If described UE is operated in TDD mode, the uplink and downlink carrier wave is identical,
When employed up and descending sign indicating number resource was not all striden time slot, the carrier load of calculating was the minimum time-slot load value of this carrier wave on the base station;
When employed up and descending sign indicating number resource was striden time slot, the carrier load of calculating was the time-slot load mean value of this carrier wave on the base station;
If described UE is operated in mode of frequency division duplexing, to distinguish up/descending carrier and calculate described carrier load, the up-link carrier load is the carrier load of up-link carrier correspondence, the descending carrier load is the carrier load of descending carrier correspondence; Among the described step B3, the up and descending carrier that load is minimum is respectively as the corresponding up and descending carrier of described switching target small area.
The inventive method, RNC according to UE (terminal) report apart from its several nearest base stations with frequently with/or the path loss measurement report values of alien-frequency district (being that several sub-district path loss measured values of using of RNC are respectively from these several different base stations), reach the information on load that RNC obtains by calculating, be the payload on each carrier wave of above-mentioned several base stations, generate carrier wave with frequency or alien frequencies handover-target base station and switching target small area correspondence.These several maximum is three.
The present invention proposes a kind of method for handover control that guarantees link-quality, promptly when link-quality is good, do traditional sub-district and switch, when the link-quality variation, do load balancing of the present invention and switch.The measurement control method that switch the sub-district that the present invention proposes, adopt terminal to report apart from its several nearest base stations with frequently with/or the path loss measured value of alien-frequency district obtain with frequently or the target BS that switches of alien frequencies.RNC determines the pairing carrier wave of Target cell that load balancing is switched according to cell load information and sub-district path loss measured value.Wherein when calculated load,, need to judge whether terminal strides time slot, and its up-link carrier is identical with descending carrier for the terminal UE that is operated in TDD mode (TDD).For the terminal UE that is operated in mode of frequency division duplexing, need the uplink and downlink load of distinguishing cell, the uplink and downlink load of sub-district is exactly the carrier load of the pairing uplink and downlink carrier wave in sub-district.
Need to prove: the information on load of sub-district can be divided into time-slot load, two kinds of definition of carrier load herein, the definition of time-slot load is many, has taken yard resource number etc. as time slot reception gross power, time slot interference power, time slot signal to noise ratio, time slot data business throughput, time slot.Definition does not limit the inventive method to time-slot load.The present invention to the definition of the carrier load of tdd mode terminal can be: carrier load is the time-slot load mean value (being time slot load mean value) of all time slots of uplink and downlink of the corresponding carrier wave in sub-district.The present invention to the definition of the carrier load of tdd mode terminal also can be: the up minimum time-slot load value of the corresponding carrier wave in sub-district and the mean value (being minimum time-slot load value) of descending minimum time-slot load value.
According to the protocol specification requirement, when switched the sub-district, there were a upper limit in sub-district number that terminal is measured and carrier wave number, and promptly terminal possibly can't be measured all adjacent sub-districts, provides the Target cell of switching scope to be restricted and make.The inventive method does not then have this restriction, under the condition of a carrier wave that only needs each adjacent base station of measurement, terminal just can be carried out with switching frequently or the alien frequencies switching selectively to all adjacent sub-districts, it is many that the number of measuring the sub-district is reduced, corresponding measurement is more timely, reliable, thereby improved the handover success rate of terminal, simultaneously can also be at the unrestricted a plurality of intercarriers of the number load of balanced minizone neatly, when guaranteeing to switch, guarantee user's link-quality.
The present invention is used for the 3G wireless communication network system, applicable to TDD and two kinds of patterns of FDD.
Description of drawings
Fig. 1 is the presence of intercell interference schematic diagram when switching between co-frequency cell;
Fig. 2 is based on the switching controls FB(flow block) that the present invention measures control method.
Embodiment
The present invention proposes a kind of measurement control method that switch the sub-district that is used for, and makes UE still can carry out switching with switching frequently, alien frequencies selectively to all adjacent sub-districts under the condition of measuring minimum sub-district number, improves handover success rate; Reduce the gaging pressure of terminal simultaneously, the measured value of more timely reliably updating terminal helps carrying out timely and accurately switching, and raising system greatly carries out the flexibility of load balancing.
With frequency or alien-frequency district path loss size, it is Zone switched to judge whether terminal enters by relatively in the present invention, and determines concrete switching target small area.
Measurement control method of the present invention is mainly reflected in two aspects:
1) if terminal to report be 1G/1D/2A incident (best with frequently or alien-frequency district when changing), system thinks that near the presence of intercell interference the terminal position in the case is little, then the system requirements terminal is carried out the switching of traditional minizone, and same frequency or the alien frequencies Target cell selected when promptly terminal is switched are provided by the 1G/1D/2A incident.
2) if terminal to report be that link-quality worsens incident, system thinks that presence of intercell interference is bigger in the case, then the system requirements terminal is carried out the switching based on load.This moment, the system requirements terminal was when reporting links deterioration incident, (the report number of co-frequency cell and alien-frequency district path loss measured value is no more than three also will to add the path loss measured value that reports co-frequency cell and alien-frequency district minimum simultaneously, on give the correct time and this path loss measured value that is no more than three sorted by size, and what make number one is exactly wherein minimum one), the Target cell that system is switched according to the measurement report of these sub-districts of terminal to report and the information on load decision terminal obtained again.
By adjusting the threshold value that link-quality worsens, a reasonably compromise consideration can be done by system between handover success rate and switching times.
Referring to Fig. 2, measure the switching flow block diagram of control method based on the present invention.
Step 21, the RNC configuration concurrency send UE measuring control information.The present invention provides the terminal that is used for this measurement control method and measures the control configuration, and wherein link-quality worsens RRM (RRM:Radio Resource Management) the algorithm flexible configuration of the UE measuring control information of incident correspondence according to the reality employing.
UE measures the control configuration, comprising:
1) incident (concrete configuration is 1G Event or 1D Event) measurement configuration information is set in UE common frequency measurement (Intra-frequency measurement) message.
2) incident (concrete configuration is 2A Event) measurement configuration information is set in UE different-frequency measure (Inter-frequency measurement) message, and in the additional metrical information of this message, adds the measurement ID of common frequency measurement message.
3) measure the setting UE measurement Configuration events corresponding in the message at UE, and in the additional metrical information of this message, add the measurement ID of common frequency measurement message and different-frequency measure message with link-quality deterioration incident.
Need to prove: each is measured message and must sequentially organize and send according to the description order in the above-mentioned allocation plan (referring to 1 → 2 → 3 order) in the above-mentioned allocation plan; The configuration of above-mentioned same frequency/different-frequency measure, a carrier wave that requires terminal only to measure each adjacent base station to support (adjacent base station may be supported a plurality of carrier waves, only measures one of them carrier wave and just can avoid unnecessary measurement to other carrier wave); Measuring ID is provided by the IE-" Measurement Identity " among the Uu interface message MEASUREMENT CONTROL.
Above-mentioned collocation method is the basis that technical solution of the present invention realizes.
Step 22, RNC receives the measurement report from UE, and this measurement report is that UE reports according to measuring control information tissue and the order that RNC disposes to UE.
Step 23, RNC carries out reported event to the measurement report that comes self terminal and judges, promptly judges it is 1G/1D/2A incident or link degradation incident, is then execution in step 241,242 of 1G/1D/2A incident, is then execution in step 251,252 of link degradation incident.This judgement helps guaranteeing link-quality, and its algorithm is simple.
Step 241, when terminal to report 1G/1D/2A incident, the system requirements terminal is carried out traditional minizone and is switched, the same frequency or the alien frequencies Target cell that adopt when terminal is switched are provided by the 1G/1D/2A incident, generate switching target small area according to pilot signal measurement information (pilot signal strength is the strongest) again;
Step 242 is carried out the minizone by the switching target small area of determining and is switched.
Step 251, when terminal to report link degradation incident, the system requirements terminal carries out switching based on the load balancing of load, generates the Target cell that load balancing is switched according to information on load and cell measurement information.
Suppose: adjacent base station is supported N different descending carrier.
N the descending carrier label i that the base station is supported, i=1,2,3 ..., N;
Several sub-districts in the terminal survey report message (representative is apart from its nearest several base stations) label j, j=1 ..., j≤3;
The payload that base station j goes up carrier wave i is L
I, j, the path loss measured value that terminal measures base station j is M
j
Then the generation method of RNC load balancing switching target small area was divided into for two steps:
(1) the minimal path loss measurement value M that at first reports according to UE
j, determine this minimal path loss measurement value M
jCorresponding base station is a handover-target base station.
(2) then to the payload ordering of each carrier wave on the handover-target base station, the up of load minimum is exactly the corresponding up and descending carrier of switching target small area with descending carrier, and wherein the up-link carrier of tdd mode is identical with descending carrier.
During the payload of each carrier wave on calculating this handover-target base station, for efficient balance minizone load, the payload of each carrier wave all needs to consider interacting apart from same carrier wave load on several nearest base stations of UE, promptly calculating the load of each carrier wave on this handover-target base station, is to calculate by uploading the same last carrier load sum in three base stations (comprising this handover-target base station) at the most nearest apart from UE of phase of wave with handover-target base station.
The base station that is used for the calculated load size above is link-quality additional same frequency that reports and/or iso-frequency adjacent community path loss measured value institute base station one to one when worsening.
If there is not this carrier wave in certain base station, then the corresponding load value of this carrier wave is taken as 0 on this base station.Payload on the handover-target base station on the carrier wave i is:
This handover-target base station, the minimum carrier wave of load is the carrier wave of switching target small area correspondence on N the carrier wave.
Base station j goes up the load (L of carrier wave i in the formula (I)
I, j) size is periodically result calculated of RNC, its computational methods are as follows:
If to be switched user job is at tdd mode, when its employed up and descending sign indicating number resource was not all striden time slot, L then loaded
I, jRepresenting base station j to go up the minimum time-slot load value of carrier wave i, is the up minimum time-slot load value of this carrier wave i and the mean value of descending minimum time-slot load value; When its employed upstream or downstream sign indicating number resource was striden time slot, L then loaded
I, jRepresenting base station j to go up the time-slot load mean value of carrier wave i, is the time-slot load mean value of all time slots of up-downgoing of this carrier wave i.
The L if to be switched user job at fdd mode, is then loaded
I, jRepresent base station j to go up the carrier load of carrier wave i.Need distinguish up/descending carrier when calculating carrier load, promptly its up-link carrier load is exactly the carrier load of up-link carrier correspondence, and the descending carrier load is exactly the carrier load of descending carrier correspondence.
The above-mentioned implementation method simple and flexible of carrying out minizone load balancing of switching by load balancing.
Step 252 is carried out load balancing by the load balancing switching target small area of determining (carrier wave that definite handover-target base station is corresponding with switching target small area) and is switched.
The inventive method makes UE only need measure the same frequency and/or the alien-frequency district of minimum number when switching, the renewal that makes the terminal measured value is more in time with reliable, help switching timely and accurately, and switchable TDD/FDD alien frequencies target carrier number is unrestricted, helps the load balancing of intercarrier.In a word, the present invention has reduced the complexity that the terminal realization is switched, and improves user's success rate for switching, and has guaranteed link-quality as much as possible, and the present invention has simultaneously reduced the complexity of minizone load balancing algorithm.
Claims (9)
1. the measurement control method switched of a mobile communication cells, radio network controller (RNC) receives the measurement report from user equipment (UE), and this measurement report is the measuring control information tissue of UE configuration by RNC and reports, it is characterized in that comprising:
A. when the UE reporting links worsens event report, also subsidiary several apart from the nearest base station of this UE with frequently with/or the path loss measurement report values of alien-frequency district, and execution in step B; When UE reports the 1G/1D/2A event report, execution in step C;
B.RNC determines the carrier wave of the handover-target base station and the switching target small area correspondence of load balancing according to the load of carrier wave on these several path loss measurement report values and its corresponding several base stations;
C.RNC generates switching target small area according to pilot signal measurement information from same frequency or alien frequencies Target cell that the 1G/1D/2A incident of UE provides.
2. method according to claim 1 is characterized in that RNC is the control information of UE allocating and measuring, comprising:
A., 1G/1D affair configuration information is set in UE common frequency measurement message;
B., 2A affair configuration information is set in UE different-frequency measure message, and in the additional metrical information of this UE different-frequency measure message, adds the measurement ID of common frequency measurement message;
C. measure the measurement configuration information that link degradation incident correspondence is set in the message at UE, and in the additional metrical information of this UE measurement message, add the measurement ID of common frequency measurement message and different-frequency measure message.
3. method according to claim 2 is characterized in that: RNC with described measuring control information by the sequential organization of described a → b → c and send to UE; In the different-frequency measure configuration of the configuration of the common frequency measurement of described step a and step b, require UE only to measure the carrier wave that each adjacent base station is supported.
4. method according to claim 1, it is characterized in that in the described steps A, described several apart from the nearest base station of UE with frequently with/or the path loss measurement report values of alien-frequency district, be described UE by one on the desired adjacent base station of measuring system with carrier wave frequently or alien frequencies carrier wave resulting at the most three with frequently with/or the minimal path loss value of alien-frequency district.
5. method according to claim 4 is characterized in that described step B further comprises:
The base station of a minimum path loss measurement report values correspondence is defined as handover-target base station in three path loss measurement report values at the most that B1.RNC will obtain;
B2. calculate the load of each carrier wave on this handover-target base station, and sort by size;
The carrier wave of the minimum of B3. will loading is as the carrier wave of described switching target small area correspondence.
6. method according to claim 5, it is characterized in that: among the described step B2, the load of each carrier wave on the handover-target base station, be by with this handover-target base station upload phase of wave with and comprise calculating of this handover-target base station apart from carrier load sum on nearest three base stations at the most of UE, these at the most three base stations nearest apart from UE are link-quality additional same frequencies that report and/or iso-frequency adjacent community path loss measured value institute base station one to one when worsening.
7. method according to claim 6 is characterized in that: the load of each carrier wave is periodically calculated by RNC on the described base station, comprising:
If described UE is operated in TDD mode, the uplink and downlink carrier wave is identical,
When employed up and descending sign indicating number resource was not all striden time slot, the carrier load of calculating was the minimum time-slot load value of this carrier wave on the base station;
When employed up and descending sign indicating number resource was striden time slot, the carrier load of calculating was the time-slot load mean value of this carrier wave on the base station;
If described UE is operated in mode of frequency division duplexing, to distinguish up/descending carrier and calculate described carrier load, the up-link carrier load is the carrier load of up-link carrier correspondence, the descending carrier load is the carrier load of descending carrier correspondence; Among the described step B3, the up and descending carrier that load is minimum is respectively as the corresponding up and descending carrier of described switching target small area.
8. method according to claim 7 is characterized in that: described minimum time-slot load value is the mean value according to up minimum time-slot load value of described carrier wave and descending minimum time-slot load value calculating.
9. method according to claim 7 is characterized in that: described time-slot load mean value is the load mean value that calculates according to up and descending all time slots of described carrier wave.
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| WO2010009674A1 (en) * | 2008-07-22 | 2010-01-28 | 大唐移动通信设备有限公司 | Method, system and equipment for measuring path loss |
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| WO2010063241A1 (en) * | 2008-12-05 | 2010-06-10 | 华为技术有限公司 | Method and device for network cell selection |
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| WO2010078729A1 (en) * | 2009-01-12 | 2010-07-15 | 华为技术有限公司 | Method, apparatus and system for multi-carrier cell handover |
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