CN1168245C - SIR measuring method and device for WCDMA uplink (backward) link - Google Patents
SIR measuring method and device for WCDMA uplink (backward) link Download PDFInfo
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- CN1168245C CN1168245C CNB011367261A CN01136726A CN1168245C CN 1168245 C CN1168245 C CN 1168245C CN B011367261 A CNB011367261 A CN B011367261A CN 01136726 A CN01136726 A CN 01136726A CN 1168245 C CN1168245 C CN 1168245C
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Abstract
The present invention relates to an SIR measurement method suitable for the SIR measurement of an internal ring in the power control of an uplink of a WCDMA communication system. The present invention has the distinct part that a new SIR measurement idea is put forward. The respective SIR measurement of signals from different paths is respectively carried out before RAKE mergence; the total SIR of received signals is the sum of the SIR of signals of all paths. The idea uses single-path measurement as a module, has simple and flexible algorithm, and enhances measurement precision by decreasing the introduction of channel estimation error.
Description
(1) technical field:
The present invention relates to the sir measurement method and apparatus of WCDMA (Wideband Code Division Multiple Access (WCDMA)) system uplink (oppositely) link, and be the back closed loop power control on basis thus.
(2) background technology:
In November, 1999, International Telecommunication Association (ITU) has passed through the recommended standard of 3-G (Generation Three mobile communication system) IMT-2000 wireless transmission means.This system is real broadband Multimedia Mobile Communication Systems, can realize high quality broadband multimedia integration business, global seamless covering, and the requirement of carrying out information interchange at any time, is Anywhere by any way satisfied in global roaming.In the recommended standard of passing through, adopt the standard of CDMA technology to account for leading position, the IMT-MC standard on the CDMA2000 standard base that the most important thing is to be based upon the IMT-DS standard on Europe, the Japanese WCDMA standard base that proposes and to be based upon the North America proposition.Current, mobile communication development is fast changing, at a high speed, the high-quality transmission an urgent demand third generation wide-band mobile communication system of broadband services commercial early.The present invention proposes under the WCDMA of research and development commercialization communication system.
As everyone knows, cdma system is a communication system that huge potential advantages are arranged, but also is an interference limiting system, and the embodiment of its superiority depends on the use of various key technologies.Especially the research of power control techniques and application have obtained extensive insider's attention, from the Centralized Power Control to the distributed power, control, control to based on the control of the power of quality of service from constant power, the algorithm that wherein uses that interts also is divided into unified thresholding and adaptive threshold algorithm again, the control of single-bit fixed step size power and many bits variable step power control scheduling algorithm, invariably in order to pursue the communication quality optimization, the maximized target of power system capacity.But these all are can accurately estimate the power control strategy of studying under the prerequisite of accurately measuring to received signal to the characteristic of channel with hypothesis.In fact, owing to be subjected to the restriction of method of measurement, attainable accuracy of measurement tool, accomplish that free from error to received signal measurement is impossible, can only seek the better method of measurement of performance: it should have more high-precision measurement performance, be convenient to hardware again and realize having better operability.
The WCDMA of one of appointing system is positioned closed power control to control based on the fixed step size fast power of QoS (quality of service) in the 3GPP agreement among the IMT-2000.In view of the above, we have determined the fixed step size fast closed-loop power controlling schemes of interior ring+outer shroud, by the transmitted power of power control break signal, the SIR of ring actual measurement in making (signal and average interference add the ratio of background noise) remains on the target SIR that outer shroud provides, thereby satisfies operation quality requirement.Wherein, interior ring sir measurement is the basis of power control mechanism good operation, not accurate interior ring sir measurement, and the comparison of inner and outer rings SIR is just meaningless, also just out of the question well behaved at all power control.
The research work that measures the sir measurement of base band from the CIR of RF (radio frequency) has obtained various countries scholars' discussion always, what majority carried out is theoretical research, and concrete method of measurement adopts the most classical sir measurement method based on frequency pilot sign and data time division multiplexing frame structure that is provided by [1] substantially.Carrying out WCDMA power control strategy research and development early stage, we are also once according to the thought of this algorithm, carry out performance simulation work in conjunction with the frame structure of WCDMA system recommendations, and measurement performance is but always very not as one wishes.After careful this algorithm of point-to-point analysis, discovery is because this algorithm has enlarged the error of being brought by channel estimating and finally caused sir measurement inaccurate.Usually, what think desirable channel estimating utilization in theory is the general evaluation system characteristic of multiple access interference plus background noise, but require every time slot to provide in one ring sir measurement value under the fast closed-loop power controlling mechanism, this just makes take a sample this capacity (mostly being 2560chip most) greatly inadequately of channel estimating in the reality; And 3GPP existing protocol regulation ascending control channel number of pilot symbols is 3,4,5,6,7,8, and the sample size of ring sir measurement still less just will inevitably cause channel estimation errors in promptly can be used for.
(3) summary of the invention:
The application of the sir measurement method of the present invention's design is the base band sir measurement with communication system of Fig. 1 frame structure, is particularly useful for interior ring sir measurement in the control of WCDMA communication system up-link power.Distinctive feature of the present invention has been to propose a kind of new thought of sir measurement: before RAKE merges the signal from different paths is carried out separately sir measurement respectively, the total SIR of received signal is each path signal SIR sum.This idea is measured as module with Dan Jing, and algorithm is realized simple and flexible, and improves certainty of measurement by the introducing that reduces channel estimation errors.
Specific implementation is as follows: (measuring with the time slot is unit, might as well be the example explanation with the sir measurement of certain user K time slot)
1, at the base station receiving terminal, each the footpath DPCCH despread signal K time slot that certain user is broken down into L bar Dan Jing is imported each single footpath sir measurement module respectively, the parallel single footpath sir measurement that carries out L K time slot.
The concrete steps of single footpath sir measurement are as follows:
(1) measures K time slot list footpath instantaneous signal power with single footpath instantaneous signal power checker
(2) disturb with the instantaneous multiple access in single footpath and the Background Noise Power measuring appliance records instantaneous multiple access interference and the Background Noise Power of K time slot Dan Jing
(3) (2) being obtained instantaneous multiple access disturbs and Background Noise Power
Input noise averager (E1.3) disturbs and Background Noise Power I with the average multiple access that previous (K-1) time slot obtains
Updpcch, l(k-1) be weighted on average, draw the average multiple access in K time slot list footpath and disturb and Background Noise Power (abbreviation average noise power) I
Updpcch, l(k);
(4) the K time slot list footpath instantaneous signal power that obtains with (1)
Obtain K time slot list footpath average noise power I divided by (3)
Updpcch, l(k), just can obtain single footpath sir measurement value SIR of this user K time slot
Updpcch, l(k).
2,, just obtain the up sir measurement value SIR of this user K time slot single footpath sir measurement value input SIR combiner addition by 1 L that obtains a K time slot
Uplink(k).
The sir measurement device of hence one can see that WCDMA system uplink (oppositely) link comprises: single footpath sir measurement module (comprise single footpath instantaneous signal power checker, the instantaneous multiple access in single footpath disturbs and Background Noise Power measuring appliance, noise averager, single footpath SIR are divided by device) and SIR combiner.Need single footpath sir measurement number of modules L of usefulness to determine that by system requirements the RAKE that promptly equals system requirements merges the footpath number in concrete the application.
At first, Fig. 1 be frame structure according to the WCDMA uplink dedicated physical channels DPCH of 3GPP agreement defined extract use the present invention carry out the sir measurement method based on frame structure.The DPDCH of uplink dedicated physical channels DPCH and DPCCH I/Q in each radio frames is multiplexing among Fig. 1, because DPCCH and DPDCH use channel code (ovsf code) spread spectrum of quadrature respectively, so only need DPCCH to constitute by known frequency pilot sign and unknown data.Stipulate that by agreement each up DPCCH time slot (slot) has 10 bits.Wherein, the number of symbols N of frequency pilot sign Pilot
Pilot=3-8; The formation of data data is determined by the upper strata, can comprise TFCI (transformat combination indication), FBI (feedback information), TPC (through-put power control), its number N
Data=(10-N
Pilot).And the bit number N of each up DPDCH
Data=(10*2
k), by the k decision, also promptly select different spreading factor SF=256/2 for use by different business
kDecision, it does not influence the measurement of carrying out SIR with the present invention.
Fig. 4 has provided the measurement mechanism of SIR of the present invention, embodies innovative idea of the present invention: before RAKE merges the signal from different paths is carried out separately sir measurement respectively, the total SIR of received signal is each path signal SIR sum.Measurement unit is a time slot (1slot equals 0.66ms in WCDMA reverse link system).Concrete Measuring Time is less than a time slot, and measures that used number of pilot symbols is relevant (generally selects N for use
Pilot, then Measuring Time equals (N
Pilot/ 10) * 0.66ms).Sir measurement device of the present invention is except that receiving and processing device, the entity that also comprises has L single footpath sir measurement module (E1), with a SIR combiner (E2), described receiving and processing device is connected with single footpath sir measurement module, and single footpath sir measurement module is connected with the SIR combiner.The footpath number that L merges for system requirements RAKE.Wherein, single footpath sir measurement module (E1) comprising: single footpath instantaneous signal power checker (E1.1), the instantaneous multiple access in single footpath disturbs and Background Noise Power measuring appliance (E1.2), noise averager (E1.3), single footpath SIR are divided by device (E1.4), described single footpath instantaneous signal power checker and the single footpath SIR device that is divided by is connected, and single directly instantaneous multiple access interference is connected with the noise averager with the Background Noise Power measuring appliance.SIR combiner (E2) is an adder.
Beneficial effect of the present invention: (1) aspect the realization difficulty or ease, the Dan Jing before the present invention merges with RAKE is a research object, easily realizes modularization.When RAKE merged footpath number variation, the present invention met the demands by the single footpath of additions and deletions sir measurement module.(2) aspect measurement performance, the present invention sets about from the introducing that reduces error as far as possible, directly each the footpath despread signal that receives is carried out sir measurement.So just can avoid the secondary of channel estimation errors to introduce, the certainty of measurement of SIR is improved.Further, be the core of inner loop power control with this high-precision sir measurement, implement the closed power of WCDMA system reverse link and control guaranteed qos better, thereby improve power system capacity widely.
(4) description of drawings:
Further specify the present invention below in conjunction with accompanying drawing.
Fig. 1 is for using the frame structure that the present invention carries out sir measurement.
Fig. 2 is for using WCDMA reverse link system block diagram of the present invention.
Fig. 3 is the closed power control of base station based on the present invention.
Fig. 4 is a device block diagram of the present invention.
Fig. 5 is single footpath sir measurement module among the present invention.
Relation between each accompanying drawing be shown in Figure 1 be DPDCH among Fig. 2 (T15) and DPCCH (T16); Fig. 3 is that (R1) controlled based on the present invention's closed power in the base station among Fig. 2; Fig. 4 is the sir measurement device (R114) among Fig. 3; Fig. 5 is single footpath sir measurement module (E1) among Fig. 4.
(5) embodiment:
What Fig. 5 described is single as described in Figure 4 directly concrete structure of sir measurement module (E1).
Wherein single footpath instantaneous signal power checker (E1.1) comprising: multiplier I (E1.11), N
PilotSymbolic integration averager I (E1.12), plural number are asked die device I (E1.13), squarer I (E1.14), described multiplier I and N
PilotSymbolic integration averager I, plural number ask die device I, squarer I to be connected in series successively.
The instantaneous multiple access in single footpath disturbs and Background Noise Power measuring appliance (E1.2) comprising: subtracter (E1.21), plural number are asked die device II (E1.22), squarer II (E1.23), N
PilotSymbolic integration averager II (E1.24), described subtracter and plural number ask die device II, squarer II, N
PilotSymbolic integration averager II is connected in series successively.
Noise averager (E1.3) comprising: multiplier II (E1.31), multiplier III (E1.32), adder (E1.33), the described multiplier II of delayer (E1.34), multiplier III are connected with adder (E1.33), and adder is connected with delayer (E1.34).
Single footpath SIR device (E1.4) that is divided by comprising: divider (E1.41).
When fully synchronously, base station receiver obtains RAKE merging footpath number L (I2.1) after receiving processing, frequency pilot sign (I2.2), number of pilot symbols (I2.3) and each be channel estimating (I2.4) directly, and certain user's multipath mixed signal is decomposed into each footpath despread signal of Dan Jing.
Below K time slot of explanation the 1st footpath DPCCH despread signal enters the SIR that single footpath sir measurement module (E1) obtains the 1st footpath
Updpcch, l(k) processing procedure: K time slot of the 1st footpath DPCCH despread signal imported multiplier I (E1.11) with frequency pilot sign, pursues the bit multiplied result and imports N respectively
PilotSubtracter I (E1.21) among the measuring appliance I (E1.2) of instantaneous multiple access interference in the single footpath of symbolic integration averager I (E1.12) and calculating and Background Noise Power does minuend.N at single footpath instantaneous signal power checker (E1.1)
PilotIn the symbolic integration averager (E1.12) to N
PilotIndividual data are carried out integral mean, and mean value input plural number is asked die device I (E1.13) to ask to enter squarer I (E1.14) behind the mould and obtained square value, and every time slot sampling obtains the 1st footpath K time slot instantaneous signal power
Among the subtracter II (E1.21) in the measuring appliance (E1.2) of instantaneous multiple access interference in single footpath and Background Noise Power, the channel estimating in the 1st footpath is done subtrahend, after subtracting each other the result who obtains and importing plural number and ask die device II (E1.22) to ask mould, enter squarer II (E1.23) and obtain square value, enter N again
PilotSymbolic integration averager II (E1.24) carries out N
PilotThe integral mean of individual data carries out instantaneous multiple access interference and the Background Noise Power that every time slot sampling obtains the 1st footpath K time slot to its result
Multiplier II (E1.31) in the input noise averager (E1.3) and (1-α) multiply each other, the result sends into adder (E1.33) and does summand, and the average multiple access of last time slot in another multiplier III (E1.32) (i.e. K-1 time slot) disturbs and Background Noise Power I
Updpcch, l(k-1) (promptly obtained through delayer (E1.34) time-delay 1 time slot by the output result of last time slot adder (E1.33)) multiplying each other with the α factor, the result sends into adder (E1.33) and does addend; Here, α is a forgetting factor, between the value 0--1, generally gets 0.99 or 0.999 smoothly to fluctuate to asking the influence of average noise power owing to power control causes the multiple access interference power.The output result of adder (E1.33) is exactly the 1st footpath K time slot average noise power I
Updpcch, l(k).In single footpath SIR is divided by device (E1.4), the 1st footpath K time slot instantaneous signal power
Send into divider (E1.41) and do dividend, the 1st footpath K time slot average noise power I
Updpcch, l(k) send into divider (E1.41) and do divisor, the two result of being divided by is exactly the sir measurement value SIR of the 1st footpath K time slot
Updpcch, l(k).
Meanwhile, obtain L single footpath sir measurement value SIR of parallel processing
Updpcch, l(k) (l=1--L) input SIR combiner (E2) addition just obtains this user's of requiring K time slot sir measurement value.
Fig. 3 is the closed power controlling mechanism of base station based on the present invention, for satisfying the fixed step size fast power control based on QoS (quality of service) of 3GPP protocol requirement, the structure of ring+outer shroud in adopting: interior ring provides actual measurement sir measurement value (R115), outer shroud comprises that RAKE merges (R105), decoder (R106), the mistake piece detects (R107), low pass filter (R108), comparator (R110), outer shroud target SIR maker (R111), delayer entities such as (R112), the Block Error Rate (BLER) that requires according to different business (R109) provides target SIR (R113), interior ring sir measurement value and target SIR relatively draw power control command (TPC) (T31), form circuit controls travelling carriage power transmit control device (T1).Wherein special character is, the measurement (R114) of interior ring SIR is exactly the present invention's (seeing shown in Figure 4); Therefore, the input point of interior ring is (R104) before the RAKE combiner, and each single footpath despread signal of input is parallel processing in interior ring sir measurement.Can provide high-precision interior ring SIR according to the closed power controlling mechanism based on the present invention shown in Figure 3, thereby satisfy the requirement (seeing the invention effect) of different business better.
What Fig. 2 provided is to implement WCDMA reverse link system block diagram of the present invention.According to the 3GPP agreement, the transmitting terminal travelling carriage at first carries out Base-Band Processing to the information that will transmit, comprise and add CRC (cyclic redundancy check (CRC)) sign indicating number (T10), tail bit (T11), chnnel coding (T12), interweave (T13), physical channel mapping (T15 and T16), spread spectrum (T19 and T20), scrambling (T24), through carrying out QPSK modulation (T29 and T30) behind the forming filter (T25 and T26), send into power amplifier (T36) amplifying emission again.Wherein, spreading code is ovsf code (orthogonal variable frequency extension factor code), special-purpose spreading code (T18) c of control channel DPCCH
Q=c
256,0, the spreading code c of data channel DPDCH
I(T17) use non-c
Q=c
256,0Ovsf code.(one of-------) expression is connected and has only a DPCCH input signal dotted line of Fig. 2 combiner (T21 and T21), solid line (---) expression data can account for a plurality of DPDCH code channels, (.-.-.) expression can merge a DPCCH or several DPDCH to chain-dotted line simultaneously, and then the complex signal I+jQ of DPCCH and DPDCH formation could carry out complex multiplication with multiple scrambler (T23).Be noted that: MS power transmit control device (T1) is adjusted the transmitting power of travelling carriage according to receiving the power control command of sending based on the present invention's closed power control (R1) base station (T31).MS power transmit control device (T1) comprises multiplier (T33), delayer (T34), adder (T35) and power amplifier (T36).Its control mechanism satisfies p (k)=p (k-1)+TPC
Command* Δ, here, k is a time slot, the power that p (k) sends for travelling carriage (dBm of unit); Δ is that power is adjusted step-length, value 1dB or 2dB; TPC
CommandBe power control command (T31) value+1 (when target SIR among Fig. 3 (R113)＞interior ring sir measurement value (R115)) or-1 (when target SIR among Fig. 3 (R113)＜interior ring sir measurement value (R115)).In power control, use the present invention and can obtain good effect as the WCDMA reverse link system of Fig. 2.
Claims (1)
1.WCDMA the sir measurement method of system uplink (oppositely) link is characterized in that, carries out according to the following steps:
(1) at the base station receiving terminal, each the footpath DPCCH despread signal K time slot that certain user is broken down into L bar Dan Jing is imported each single footpath sir measurement module respectively, the parallel single footpath sir measurement that carries out L K time slot, single footpath sir measurement here, carry out according to the following steps:
I, measure K time slot list footpath instantaneous signal power with single footpath instantaneous signal power checker
II, disturb and Background Noise Power with the instantaneous multiple access that the instantaneous multiple access in single footpath disturbs and the Background Noise Power measuring appliance records K time slot Dan Jing
III, Step II is obtained instantaneous multiple access disturb and Background Noise Power
Input noise averager (E1.3) disturbs and Background Noise Power I with the average multiple access that previous time slot obtains
Updpcch, l(k-1) be weighted on average, draw the average multiple access in K time slot list footpath and disturb and Background Noise Power I
Updpcch, l(k);
IV, the K time slot list footpath instantaneous signal power that obtains with step I
The K time slot list footpath average noise power I that obtains divided by Step II I
Updpcch, l(k), just can obtain single footpath sir measurement value SIR of this user K time slot
Updpcch, l(k).
(2), just obtain the up sir measurement value SIR of this user K time slot single footpath sir measurement value input SIR combiner addition of the L that obtains by step (1) K time slot
Uplink(k).
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| CNB011367261A CN1168245C (en) | 2001-10-22 | 2001-10-22 | SIR measuring method and device for WCDMA uplink (backward) link |
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|---|---|---|---|
| CNB011367261A CN1168245C (en) | 2001-10-22 | 2001-10-22 | SIR measuring method and device for WCDMA uplink (backward) link |
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| CN100417277C (en) * | 2004-09-30 | 2008-09-03 | 中兴通讯股份有限公司 | SIR measuring method for broadband CDMA system uplink |
| CN100375405C (en) * | 2005-05-20 | 2008-03-12 | 北京首信股份有限公司 | Inverse external external ring power controlling method for CDMA mobile communication system |
| CN101039171B (en) * | 2007-03-15 | 2011-08-24 | 中兴通讯股份有限公司 | Method for demodulating ACK slot signal of HS-DPCCH channel |
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