CN101990232B

CN101990232B - User terminal (UE) and method for measuring PCCPCHRSCP (Primary Common Control Physical Channel Received Signal Code Power)

Info

Publication number: CN101990232B
Application number: CN200910109244.2A
Authority: CN
Inventors: 宿金海
Original assignee: ZTE Corp
Current assignee: Shenzhen ZTE Microelectronics Technology Co Ltd
Priority date: 2009-08-04
Filing date: 2009-08-04
Publication date: 2014-07-02
Anticipated expiration: 2029-08-04
Also published as: CN101990232A; WO2011015079A1

Abstract

The invention relates to a user terminal and a method for measuring PCCPCHRSCP (Primary Common Control Physical Channel Received Signal Code Power). The user terminal comprises a cache module, a control module and a measuring module. The method comprises the following steps of: caching FFT (Fast Fourier Transform) and a reciprocal of the FFT of basic Midamble codes of all measuring cells in advance by the user terminal; after receiving a measuring command, carrying out channel estimation on all the measuring cells according to the cached FFT and the reciprocal of the FFT of the basic Midamble codes; and calculating the PCCPCHRSCP of the corresponding cell according to a channel estimating result. The invention improves the measuring precision and reduces the calculation amount and power consumption.

Description

The method of user terminal and measurement PCCPCH RSCP a kind of

Technical field

The present invention relates to TD-SCDMA(TD SDMA) field, relate in particular to a kind of user terminal (UE) and measure PCCPCH(Primary Common Control Physical Channel) RSCP(received signal code power) method.

Background technology

In TD-SCDMA mobile communcations system, physical layer is at idle pulley, enter in the various process such as pattern and business model and will carry out cell measurement at random, and the measurement of all these communities is all to determine whether starting measurement of correlation by upper-layer protocol stack according to the signal power of Serving cell at present.Cell measurement comprises Serving cell measurement, co-frequency neighbor cell measurement, iso-frequency adjacent community measurement etc., and wherein most important measuring amount is RSCP.RSCP is the power for identifying cells signal, the signal real-time tracking of user terminal (UE) to Serving cell, the scene such as UE also can carry out that community is resident according to the power of cell signal, cell reselection and community switching.

RSCP measures common way two kinds of methods, and a kind of method is to utilize the descending synchronous code of the DwPTS time slot of TD-SCDMA system wireless subframe to realize measurement; Another kind is to utilize the Midamble code of the TS0 time slot of TD-SCDMA system wireless subframe to realize to measure, i.e. our said PCCPCHRSCP, and measuring PCCPCHRSCP is the RSCP value of measuring the PCCPCH of TS0 time slot.It in Fig. 1, is TS0 time slot and the DwPTS time slot position in TD-SCDMA system wireless subframe.

In patent 200610091854.0(TD-SCDMA system, carry out the method and system of common frequency measurement) adopt the descending synchronous code of DwPTS time slot to realize measurement, although the method can weaken the noise jamming between co-frequency cell, it is large that it realizes process computation amount.The power measurement method of patent 200710118299.0(TD-SCDMA adjacent cell and mobile terminal) adopt the Midamble code of TS0 time slot to realize measurement, the method need to be safeguarded adjacent cell power excursion, and need to ceaselessly monitor the broadcast channel of adjacent cell.

Summary of the invention

Technical problem to be solved by this invention is, a kind of UE is provided and measures the method for PCCPCHRSCP, and the present invention has improved certainty of measurement, has reduced operand, has reduced power consumption.

The invention discloses the method for PCCPCHRSCP of measurement a kind of, UE in advance buffer memory TD-SCDMA respectively measures the fast Fourier transform (FFT) of the basic Midamble code in community and the inverse of FFT, when receiving after measuring command, first according to the FFT of basic Midamble code of buffer memory and the inverse of FFT, channel estimating is carried out in each measurement community, then according to channel estimation results, calculate the PCCPCHRSCP of respective cell;

Described UE carries out channel estimating to measuring community by the following method:

Step a: the rf data when pre-test community is carried out to FFT conversion;

Step b: the described rf data through FFT conversion is carried out to the absolutely dry elimination of disturbing;

Step c: the inverse to the absolutely dry FFT that disturbs the rf data of elimination and the basic Midamble code of described community of described process carries out point multiplication operation, and dot product result is carried out to invert fast fourier transformation (IFFT), obtains the residue channel estimating of described community;

Steps d: described residue channel estimating is combined to main footpath and select, obtain the channel estimating after described community associated main footpath is selected;

Step e: the channel estimating after the described community noise reduction that the channel estimating after described community associated main footpath is selected and a front iteration obtain is added, and addition result is carried out to noise reduction process, obtains the channel estimating after the noise reduction of described community;

Step f: the channel estimating after described noise reduction is carried out to FFT conversion, carry out point multiplication operation with the FFT of the basic Midamble code of described community afterwards;

Step g: iterations adds 1;

Step h: judge whether described iterations equals 4, if so,, when the channel estimating of pre-test community finishes, export described point multiplication operation result, and iterations described in zero clearing; Otherwise, using described point multiplication operation result as absolutely dry channel restoring signal of disturbing elimination, proceed to step b and carry out.

In described step b, also measure the noise of the described rf data through FFT conversion simultaneously;

In described step e, the noise that UE measures according to described step b and default noise reduction door limit value, carry out noise reduction process to described addition result.

The every wheel of described UE can be carried out cell channel estimation in the most multipair 4 communities, method is: from measure community, take out 4 communities, channel estimating is carried out in 4 of current taking-up communities, and according to the PCCPCHRSCP of cell channel estimated result calculating respective cell, according to the size of the PCCPCHRSCP calculating, sorted in described 4 communities, take out wherein two PCCPCHRSCP compare great communities, and take out Liang Ge community from remaining measurement community, continue to carry out cell channel estimation in 4 communities of current taking-up, the like, until cell channel estimation has all been carried out in all measurements community, adopt such strategy, make to disturb when elimination, as much as possible 2 the strongest communities be included in wherein, like this with regard to the elimination of maximum possible the interference between community, make to measure PCCPCHRSCP result more accurate, be more conducive to the raising of the performance such as gravity treatment and switching of UE.

In described method, after the PCCPCHRSCP of all measurements community calculates, described UE carries out power transfer and filtering processing to described PCCPCHRSCP, and reports described treated PCCPCHRSCP.

Described UE reports after PCCPCHRSCP, also safeguards cell list according to the size of described treated PCCPCHRSCP.

The every subframe of described UE is measured at most 16Ge community; 16Ge community need to be done 7 and be taken turns cell channel estimation, could finally complete the calculating of PCCPHCRSCP.

The invention also discloses a kind of user terminal, described user terminal comprises cache module, control module, measurement module and rf data module, wherein, described in

Cache module is for storing the fast fourier transform FFT of the basic Midamble code in TD-SCDMA community and the inverse of FFT;

Control module is for receiving after measuring command, by the activation marker position 1 of described measurement module; For the PCCPCHRSCP measured value receiving is carried out to power transfer and filtering;

Described measurement module is used at the TS0 of each wireless sub-frame time slot, whether the activation marker position of detecting self is 1, if so, measures the PCCPCHRSCP of each measurement community, and measuring after the PCCPCHRSCP of all measurements community, measured value is reported to described control module;

Described rf data module is used to described measurement module that rf data is provided;

Described measurement module is measured PCCPCHRSCP and is specifically comprised: from described rf data module, read rf data, and the rf data reading is carried out to FFT conversion; From described cache module, read the FFT of basic Midamble code and the inverse of FFT; According to the inverse of the FFT of described substrate Midamble code and FFT, the FFT of rf data, channel estimating is carried out in each measurement community, and according to channel estimation results, calculate the PCCPCHRSCP of corresponding measurement community;

Described measurement module is according to the FFT of the inverse of the FFT of described basic Midamble code and FFT, rf data, and the implementation of each measurement community being carried out to channel estimating is:

Step a: the rf data when pre-test community is carried out to FFT conversion;

Step c: the inverse to the absolutely dry FFT that disturbs the rf data of elimination and the basic Midamble code of described community of described process carries out point multiplication operation, and dot product result is carried out to invert fast fourier transformation IFFT, obtains the residue channel estimating of described community;

Step g: iterations adds 1;

Described control module also, for activating before measurement module, judges whether measure resource can use, and is if so, 1 by the activation marker position of described measurement module; Otherwise, after waiting resource to be measured to use, be 1 by the activation marker position of described measurement module.

The present invention is cached to the inverse of the FFT of Midamble code and FFT in UE in advance, while calculating PCCPCHRSCP, directly takes, and has reduced amount of calculation, has saved system time, has improved system effectiveness; And in the time that cell channel is estimated, carry out the absolutely dry elimination of disturbing, reduced the interference of co-frequency neighbor cell to the impact of measurement result, made measurement result more accurate; The present invention can calculate at most the PCCPCHRSCP of 16Ge community in a subframe, has reduced Measuring Time, has reduced power consumption.

Brief description of the drawings

Fig. 1 TD-SCDMA system wireless subframe structure schematic diagram;

Fig. 2 is the structural representation of UE of the present invention;

Fig. 3 is the flow chart of the method for the invention.

Embodiment

Below in conjunction with accompanying drawing and preferred embodiment, the present invention is described in further detail.

As shown in Figure 2, be the structural representation of UE of the present invention, comprise cache module, control module and, measurement module, rf data module;

Cache module is used for FFT value and the FFT reciprocal value of the Midamble code of the TS0 time slot of storing TD-SCDMA wireless sub-frame;

Control module, for receiving after measuring command, judges whether measure resource can use, and is if so, 1 by the activation marker position of described measurement module; Otherwise, after waiting resource to be measured to use, be 1 by the activation marker position of described measurement module; For the PCCPCHRSCP measured value receiving is carried out to power transfer and filtering;

Rf data module is used to described measurement module that rf data is provided;

Measurement module is used at the TS0 of each wireless sub-frame time slot, and whether the activation marker position of detecting self is 1, if so, measures the PCCPCHRSCP of each measurement community, and measuring after the PCCPCHRSCP of all measurements community, measured value is reported to control module; Measurement module is measured PCCPCHRSCP and is specifically comprised: from rf data module, read rf data, and the rf data reading is carried out to FFT conversion; From cache module, read the FFT of Midamble code and the inverse of FFT; According to the FFT of the inverse of the FFT of described Midamble code and FFT, rf data, channel estimating is carried out in each measurement community, and according to channel estimation results, calculate the PCCPCHRSCP of corresponding measurement community.

As shown in Figure 3, be the method for the invention flow chart; In the present embodiment, suppose that the FFT of basic Midamble code and the inverse of FFT of the TS0 time slot of TD-SCDMA wireless sub-frame has been stored in cache module, specifically comprise the steps:

The control module of step 301:UE receives measuring command;

Step 302: control module judges that whether measure resource can use, and if so, proceeds to step 304; Otherwise, proceed to step 303;

Step 303: wait resource to be measured to use, proceed to afterwards step 304;

Step 304: be 1 by the activation marker position of measurement module;

Step 305: measurement module is at the TS0 of each subframe time slot, whether the activation marker position of detecting self is 1 if so, to perform step 306; Otherwise, in current subframe, do not carry out any processing;

Step 306: read the FFT of basic Midamble code and the inverse of FFT from cache module;

Step 307: according to the inverse of the FFT of described basic Midamble code and FFT, channel estimating is carried out in each measurement community, and according to channel estimation results, calculate the PCCPCHRSCP of respective cell;

Wherein, cell channel is estimated to comprise the steps:

Step 3071: read rf data from rf data module---128 chip data;

Step 3072: read 128 chip data are carried out to FFT conversion, obtain the FFT of 128 chip data;

Step 3073: the data that step 3072 is obtained are carried out the absolutely dry elimination of disturbing, and measure noise simultaneously;

Step 3074: use the inverse of the FFT of the basic midamble code through disturbing the data dot product respective cell after eliminating, then dot product result is carried out to IFFT conversion, obtain the residue channel estimating of this community;

Step 3075: the residue channel estimating of described community is combined to main footpath and select, obtain the channel estimating after described community associated main footpath is selected;

Step 3076: the channel estimating after the described community noise reduction that the channel estimating after the described community associated main footpath that step 3075 is obtained is selected and a front iteration obtain is added, and the noise recording according to step 3073 and default noise reduction thresholding carry out noise reduction process to addition result, obtain the channel estimating after the noise reduction of described community;

While carrying out for the first time iteration, described " channel estimating after the described community noise reduction that a front iteration obtains " adopts its initial value, is 0;

Step 3077: the channel estimating after described noise reduction is carried out to FFT conversion, carry out point multiplication operation with the FFT of the basic Midamble code of described community afterwards;

Step 3078: iterations adds 1;

The initial value of iterations is 0;

Step 3079: judge whether described iterations equals 4, if so,, when the channel estimating of pre-test community finishes, export described point multiplication operation result, and iterations described in zero clearing; Otherwise, using described point multiplication operation result as absolutely dry channel restoring signal of disturbing elimination, proceed to step 3073 and carry out;

Proceed to after step 3073, UE proceeds next iteration, until iteration 4 times, output is for the channel estimating of calculating PCCPCHRSCP, and it is more accurate that as above channel estimation methods provided by the invention makes to measure PCCPCHRSCP.

One takes turns in channel estimating and needs, through 4 iteration, just can calculate the channel estimation value of maximum 4 communities, then according to the PCCPCHRSCP of channel estimation calculation community.4 communities of epicycle are calculated complete, carry out the calculating of 4 communities of next round, until 16Ge calculates complete in community at most.

Limiting case is that the PCCPCHRSCP of Zuo16Ge community in a subframe measures.In the present embodiment; suppose to have 16 to measure community; be numbered 1-16; take turns because UE is every and can support the RSCP that carries out at most PCCPCH 4 communities to calculate; therefore: first take out and be numbered 1-4 community, carry out cell channel estimation on Zhe Sige community, result is respectively h1, h2, h3, h4; then according to h1, h2, h3, h4, calculate the PCCPCHRSCP of Zhe Sige community by following formula;

PCCPCH_RSCP = Σ_{i = 1}^{16} {| h_{i} |}^{2}, h_{i} &Element; W_{1}

In above formula, PCCPCH_RSCP is the value that step 3079 is exported, W ₁for MiambleshiftM corresponding to PCCPCH in TS0 ₁noise reduction after Signal estimation window; h _ifor being numbered the channel estimating of community of i.

Then according to PCCPCH_RSCP1, PCCPCH_RSCP2, PCCPCH_RSCP3, PCCPCH_RSCP4, community 1-4 is sorted, suppose that ranking results is 1-4-2-3, so, 4 of community 1 and communities enter next round and calculate, and arrive this, and the first round calculates and finishes; The like, suppose every wheel after calculating, the PCCPCHRSCP of community 1 and 4 is larger, be that every wheel calculated Zhong Douyou community 1 and 4, so just can ensure always Qiang community, front 2 communities, can better eliminate like this co-channel interference, make measuring accuracy higher, always have seven and take turns calculating, remaining six take turns in calculating, and every Si Ge of wheel community is respectively: 1,4,5,6; 1,4,7,8; 1,4,9,10; 1,4,11,12; 1,4,13,14; 1,4,15,16; After has all calculated all communities, by result of calculation: PCCPCH_RSCP1---PCCPCH_RSCP16 reports control module.

Each takes turns the channel estimating of calculation plot, then the PCCPCHRSCP of calculation plot, here why getting 4 communities, is because can ensure better to disturb like this elimination, ensures the precision of measuring, simultaneously, the community of each wheel measurement is many, has increased measurement capability, certainly, the number of every wheel measurement community can be any situation in 1,2,3 or 4, every situation that 4 communities are a kind of optimums of doing of taking turns.

Step 308: after the PCCPCH_RSCP of all measurements community has calculated, report PCCPCH_RSCP value to control module;

Step 309: control module is carried out power transfer and filtering processing to the PCCPCH_RSCP value receiving;

Power transfer adopts following formula:

The dBm value of RSCP(actual measurement)=RSCP_dBm-AGC_dB+C_dB wherein, the dBm value that RSCP(surveys) refer to the PCCPCHRSCP of the actual arrival radio-frequency head by measuring; RSCP_dBm=10*lgPCCPCH_RSCP, is the PCCPCHRSCP after automatic gain amplifies, and unit is dBm; AGC_dB is gain amplifier; C_dB is channel parameter to be adjusted, and is a constant.

In the present embodiment, adopt

α filtering.After filtering, RSCP has expanded 256 times, like this, while sequence, just can not fluctuate in 1dB scope because of PCCPCHRSCP value, and can not effectively sort to the measurement result of community according to the size of PCCPCHRSCP to measuring community.

Step 310: control module to all measurements community by periodic report PCCPCHRSCP value to upper strata, then on each carrier frequency, safeguard respectively cell list.

Before control module reporting measurement result, first measurement result is shone upon according to table 1, the actual power value that is about to measure converts value corresponding in agreement to.

Table 1

The value of reporting	Measure value	Unit
			P-CCPCHRSCP_LEV_-05	P-CCPCHRSCP<-120	dBm
P-CCPCHRSCP_LEV_-04	-120≤P-CCPCHRSCP<-119	dBm
			P-CCPCHRSCP_LEV_-03	-119≤P-CCPCHRSCP<-118	dBm
……	……	……
			P-CCPCHRSCP_LEV_89	-27≤P-CCPCHRSCP<-26	dBm
P-CCPCHRSCP_LEV_90	-26≤P-CCPCHRSCP<-25	dBm
			P-CCPCHRSCP_LEV_91	-25≤P-CCPCHRSCP	dBm

In table 1, the value of reporting refers to that control module will report the span of the PCCPCHRSCP mapping on upper strata, measures value and refer to the performance number of the PCCPCHRSCP that actual measurement arrives, and unit is dBm.

The cycle reporting in this step can adopt different report cycles according to different states from " 3GPPTS25.123 ".

Below be only the preferred embodiments of the present invention; for a person skilled in the art, the present invention can have various changes or variation, within the spirit and principles in the present invention all; any amendment of doing, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.

Claims

1. a method of measuring Primary Common Control Physical Channel PCCPCH received signal code sheet power RSCP, is characterized in that,

User terminal UE in advance buffer memory TD-SCDMA respectively measures the fast fourier transform FFT of the basic Midamble code in community and the inverse of FFT, when receiving after measuring command, first according to the FFT of basic Midamble code of buffer memory and the inverse of FFT, channel estimating is carried out in each measurement community, then according to channel estimation results, calculate the PCCPCH RSCP of respective cell;

Step a: the rf data when pre-test community is carried out to FFT conversion;

Step g: iterations adds 1;

2. the method for measurement PCCPCH RSCP as claimed in claim 1, is characterized in that,

3. the method for measurement PCCPCH RSCP as claimed in claim 1, it is characterized in that, the every wheel of described UE can be carried out channel estimating in the most multipair 4 communities, method is: from measure community, take out 4 communities, cell channel estimation is carried out in 4 of current taking-up communities, and according to the PCCPCH RSCP of channel estimation results calculating respective cell, according to the size of the PCCPCH RSCP calculating, sorted in described 4 communities, take out wherein two PCCPCH RSCP compare great communities, and take out Liang Ge community from remaining measurement community, continue 4 of current taking-up communities to carry out cell channel estimation, the like, until channel estimating has all been carried out in all measurements community.

4. the method for measurement PCCPCH RSCP as claimed in claim 3, is characterized in that, described UE calculates PCCPCH RSCP by following formula:

Wherein, W ₁for MiambleshiftM corresponding to PCCPCH in the TS0 time slot of TD-SCDMA wireless sub-frame ₁signal estimation window after noise reduction; h _ifor being numbered the channel estimating of community of i.

5. the method for measurement PCCPCH RSCP as claimed in claim 1, it is characterized in that, in described method, after the PCCPCH RSCP of all measurements community calculates, described UE carries out power transfer and filtering processing to described PCCPCH RSCP, and reports described treated PCCPCH RSCP.

6. the method for measurement PCCPCH RSCP as claimed in claim 5, is characterized in that, described UE reports after PCCPCH RSCP, also on each carrier frequency, safeguards cell list according to the size of described treated PCCPCH RSCP.

7. the method for measurement PCCPCH RSCP as claimed in claim 1, is characterized in that, the every subframe of described UE is measured at most 16Ge community.

8. a user terminal, is characterized in that, described user terminal comprises cache module, control module, measurement module and rf data module, wherein, described in

Control module is for receiving after measuring command, by the activation marker position 1 of described measurement module; For the PCCPCH RSCP measured value receiving is carried out to power transfer and filtering;

Measurement module is used at the TS0 of each wireless sub-frame time slot, whether the activation marker position of detecting self is 1, if so, measures the PCCPCH RSCP of each measurement community, and measuring after the PCCPCH RSCP of all measurements community, measured value is reported to described control module;

Described measurement module is measured PCCPCH RSCP and is specifically comprised: from described rf data module, read rf data, and the rf data reading is carried out to FFT conversion; From described cache module, read the FFT of basic Midamble code and the inverse of FFT; According to the FFT of the inverse of the FFT of described basic Midamble code and FFT, rf data, channel estimating is carried out in each measurement community, and according to channel estimation results, calculate the PCCPCH RSCP of corresponding measurement community;

Step a: the rf data when pre-test community is carried out to FFT conversion;

Step g: iterations adds 1;

9. user terminal as claimed in claim 8, is characterized in that,