CN1250030C - Method and apparatus for determining transmission diver sity mode for base station - Google Patents
Method and apparatus for determining transmission diver sity mode for base station Download PDFInfo
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- CN1250030C CN1250030C CN 02156095 CN02156095A CN1250030C CN 1250030 C CN1250030 C CN 1250030C CN 02156095 CN02156095 CN 02156095 CN 02156095 A CN02156095 A CN 02156095A CN 1250030 C CN1250030 C CN 1250030C
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Abstract
The present invention provides a method and a device for determining the data down link transmission diversity mode of a base station. Firstly, the present invention estimates the first feedback weighing of a mobile unit in a first time slot, and the first feedback weighing has a first feedback phase; subsequently, the present invention estimates the second feedback weighing of the mobile unit in a second time slot, and the second feedback weighing has a second feedback phase; the absolute phase difference of the first feedback phase and the second feedback phase is compared and determines whether the data down link mode of the base station uses the closed loop transmission diversity or not. Besides, the present invention also provides the proposal that a handset simultaneously determines whether the data down link mode of the base station uses the closed loop transmission diversity or not by using a closed loop to adjust the accuracy of a result.
Description
Technical field
The present invention relates to a kind of in mobile radio communications system the method and system of determination data transmission mode, the method and the device of data downstream transmission diversity (down link) pattern of particularly a kind of mobile unit decision base station.
Background technology
In recent years, the status of spread spectrum communication system (spread spectrum communication system) in cellnet road (Cellular Mobile Communication network) and cellnet road (Cellular Mobile Communication network) is increasingly important.Particularly direct sequence CDMA (Direct Sequence Code Division Multiple Access) has become the standard of third generation mobile communication.
Improving downlink capacity (downlink capacity) then is one of main challenge of third generation mobile communication.In wireless communication system, transmission diversity (Transmit Diversity) technology is a low cost and the method that can improve downlink capacity again, and transmit diversity technique has become indispensable in a third generation behavioral system technology.Transmit diversity technique be reduce down going channel between interference, better downstream signal cooperates the reception of travelling carriage, downlink channel adopts most group orthogonal antennas when emission, send a kind of different modulated signals of information.This method is called diversity transmission.
In sending the diversity transmission technology, the transmission diversity of down link is common dual mode, uses respectively at open loop (open loop) transmission diversity and loop (close loop) transmission diversity.The open loop transmission diversity mode uses " the space-time block coding " (Space Time block coding) mode and the most full-diversities (Full diversity) of organizing transmit antennas of use, necessary enough at interval distances between antenna, can be considered independently characteristic with the signal attenuation (fading) that utilizes different antennae to be received, increase antenna gain; The loop transmission diversity mode then has two spermotypes, and two spermotypes are all used at two groups of transmit antennas and utilized the phase place and/or the gain of down going channel being measured transmission signals in (downlink channel measurement) and feedback signal processing (feedback signaling) control transmission antenna.
3. summary of the invention
Yet, by generally being applied in user's low speed driving environment at the loop transmission diversity, and under the environment of running at high speed (when speed per hour surpasses 40,50 kilometers), signal changes too fast in transmission channel, and make signal attenuation (signal fading) influence, then can estimate inaccurate problem, can allow and use the loop transmission diversity to make the degradation of system because of passage.
The invention provides a kind of in wireless communication system the method for the transfer of data diversity mode of mobile unit decision base station, comprising: (A) estimate first feedback weight of this mobile unit at first time slot, this first feedback weight has first feedback phase; (B) estimate second feedback weight of the next one second time slot of this mobile unit behind first time slot, this second feedback weight has second feedback phase; And, determine the transfer of data diversity mode of this base station (C) by this first feedback phase and this second feedback phase; Step (C) wherein also comprises: (D) relatively this first feedback phase and this second feedback phase obtain absolute phase difference; And, determine the transfer of data diversity mode of this base station (E) by this absolute phase difference; Wherein step (E) more comprises: (F) when this absolute phase difference during greater than first predetermined value, judgment value is increased by first value, when this absolute phase difference during less than this first predetermined value, this judgment value is reduced by one second value; And, send and stop the instruction of loop transmission diversity mode to this base station (G) when this judgment value during greater than second predetermined value.
The invention provides a kind of in wireless communication system the device of the transfer of data diversity mode of mobile unit decision base station, comprise: estimation unit, estimate first feedback weight of this mobile unit at first time slot, this first feedback weight has first feedback phase, and estimate second feedback weight of this mobile unit at second time slot, this second feedback weight has second feedback phase; And the decision unit, by this first feedback phase and this second feedback phase, determine the transfer of data diversity mode of this base station; Wherein this decision unit further comprises: comparing unit, and relatively this first feedback phase and this second feedback phase obtain absolute phase difference; Weighted units, when this absolute phase difference during greater than first predetermined value, this weighted units increases by first value with judgment value, and when this absolute phase difference during less than this first predetermined value, this weighted units reduces second with this judgment value and is worth; And transmitting element, when this weighted value during greater than second predetermined value, this transmitting element sends and stops the instruction of loop transmission diversity mode to this base station.
The invention provides a kind of in mobile radio communications system the method and the device of the feasibility of the transmission diversity mode of mobile unit decision base station.The channel signal of the pilot bit (Pilot Symbol) by base station DPCH (Dedicated PhysicalChannel) and the common pilot channel (common pilotchannel) of base station, the present invention can observe the change of channel signal.If the rate of change of system channel signal attenuation is too fast or the feedback error rate is too high, then indicate the base station to close the loop transmission diversity mode to obtain better performance.
The invention provides the method for the data downstream pattern of mobile unit decision base station, at first estimated mobile unit is in first feedback weight of first time slot, and this first feedback weight has first feedback phase.And estimated mobile unit is in second feedback weight of second time slot, and second feedback weight also has second feedback phase.By the calculating of first feedback phase and second feedback phase, determine the data downstream pattern of base station at last.
The invention provides the method for the downlink mode of another kind of mobile unit decision base station.At first, calculation base station of the present invention is in the answer weighting of same time slot, and this replys weighting and has the answer phase place.And estimated mobile unit of the present invention is in the feedback weight of a time slot, and this feedback weight has feedback phase.At last, by the calculating of feedback phase and answer phase place, the data downstream pattern of decision base station.
The present invention also provide a kind of in mobile radio communications system the device of data downstream (down link) pattern of mobile unit decision base station, comprise estimation unit and decision unit.The estimation unit estimated mobile unit is in first feedback weight of first time slot, and this first feedback weight has first feedback phase.The estimation unit estimated mobile unit is in second feedback weight of second time slot, and this second feedback weight has second feedback phase.The decision unit determines the data downstream pattern of base station then by the calculating of first feedback phase and this second feedback phase.
The present invention provide in addition a kind of in mobile radio communications system the device of the downlink mode of mobile unit decision base station, comprise estimation unit, computing unit and decision unit.The feedback weight of estimation unit estimated mobile unit in same time slot, this feedback weight has a feedback phase.Computing unit calculates the answer weighting of this base station at same time slot, and this replys weighting and has the answer phase place.The decision unit determines the data downstream pattern of base station then by the calculating of feedback phase and answer phase place.
Description of drawings
Fig. 1 is the calcspar of transmission diversity closed circuit system.
Fig. 2 is for calculating the method flow diagram of feedback weight parameter.
Fig. 3 determines the method flow diagram of the transfer of data diversity mode of base station for the present invention.
Fig. 4 determines the other method flow chart of the transfer of data diversity mode of base station for the present invention.
Fig. 5 determines the device of the transfer of data diversity mode of base station for the present invention.
Fig. 6 determines another device of the transfer of data diversity mode of base station for the present invention.
The assembly label declaration
100 base stations, 101 DPCH
110 mobile units, 1051,1053 antennas
500 embodiments of the invention, 501 estimation units
503 decision unit, 5031 comparing units
5033 weighted units, 5037 transmitting elements
600 embodiments of the invention, 601 estimation units
603 computing units, 605 decision unit
6051 comparing units, 6053 weighted units
6057 transmitting elements
Embodiment
The present invention by provide a kind of in mobile radio communications system mobile unit estimate the base station down signal, feedback weight is given the base station, makes the method and the device of base station determination data transmission diversity mode, to improve the performance of system.
Fig. 1 illustrates the calcspar of transmission diversity closed circuit system.As shown in Figure 1, after the signal that end 100 DPCH 101 in base station send the user is being multiplied by spread spectrum/identification code (spread/scramblecode) 102, be multiplied by feedback weight parameter (feedback weight factor) W respectively
1And W
2, the feedback weight parameter forms weighing vector (weight vector), and generally speaking, this feedback weight vector is a complex signal.Then add the first common pilot channel C respectively
1And the second common pilot channel C
2, send via antenna 1051 and antenna 1053 again.And mobile unit 110 can be by the signal deciding feedback weight that receives, and base station 100 receives phase place and gain that this feedback weight is adjusted antenna 1051 and 1053 transmission signals, and the signal to noise ratio (signal-to-noise ratio) that makes base station 100 send signals reaches maximum.
Receive the signal of base station end transmission at mobile unit end 110 after, making the characteristic of channel P that adds after the weighting by calculating is maximum, tries to achieve feedback weight w,
P＝w
HH
HHw
H=[h
1, h
2], w=[w
1, w
2]
T, h
1And h
2Be antenna 1051 and 1053 transfer to user end channel impulse response (channel impulse response).Estimate the h of antenna transmission
1And h
2Can obtain autocorrelation matrix (channel autocorrelation matrix) R=H after the value
HThe characteristic value of H (eigenvalue), and best feedback weight parameter is respective channels autocorrelation matrix R=H
HThe characteristic vector of the eigenvalue of maximum of H (eigenvector) w
f(n)=[w
1, w
2].At last, with this characteristic vector [w
1, w
2] be back to the base station, adjust phase place and the gain that antenna 1051 and 1053 sends signal for base station 100.
Fig. 2 is the method flow diagram that calculates feedback weight.At first, suppose that initial time slot n is 0 (step 201).Calculate P value (step 203).The eigenvalue of maximum that then calculates the R value is characteristic of correspondence vector w
f(n)=[w
1, w
2] (step 205).With this characteristic vector w
f(n)=[w
1, w
2] be sent to base station (step 207).At last, wait for a time slot after, make n become n+1 (step 209).
By being periodic regularly feedback in loop transmit diversity technique characteristic vector because of feedback under the user runs at high speed environment, this feedback of environment under the travelling carriage high speed postpones in signal attenuation relatively, so that the loop transmit diversity technique lowers the performance of system on the contrary, the invention provides a kind of method that determines the base station data transmission diversity mode.
Fig. 3 is the method embodiment of feasibility that the present invention determines the transmission diversity mode of base station.The present invention observes the variable quantity of channel signal phase place with this, also promptly according to judgment value P
ThThe data downstream pattern that relatively decides the base station with second predetermined value.At first, suppose that initial time slot n is 0 (step 301).After waiting for a time slot, make n become n+1 (step 303).Estimated mobile unit is at the feedback weight W of time slot n (n), and this feedback weight W (n) has feedback phase P (n) (step 305).Then, estimated mobile unit is at the feedback weight W of next time slot n+1 (n+1), and feedback weight W (n+1) also has feedback phase P (n+1) (step 307).Relatively feedback phase P (n) and feedback phase P (n+1) obtain absolute phase difference (step 309).When absolute phase difference during greater than default first predetermined value, with judgment value P
ThIncrease by first value, when absolute phase difference during less than first predetermined value, with judgment value P
ThReduce by second value (step 311).In this embodiment, first value equals second value.
Then, compare this judgment value P
ThWhether greater than second predetermined value (step 313).If judgment value P
ThGreater than second predetermined value, just send and stop the loop mode instruction to base station (step 315), the characteristic of expression channel causes phase change too fast because of the speed of a motor vehicle changes fast fast, needs to stop the loop mode signal of base station this moment.If judgment value P
ThLess than second predetermined value, just get back to step 303.
In addition, the loop mode signal of base station uses and decides feedback weight by travelling carriage feedback characteristic vector, but if this feedback weight because of travelling carriage under the environment under the high speed, make that feedback weight is wrong value, so that the loop transmit diversity technique lowers the performance of system on the contrary, the present invention determines the transfer of data diversity mode of base station also by observation signal feedback error rate.
As shown in Figure 4, the present invention supposes that initial time slot n is 0 (step 401).After waiting for a time slot, make n become n+1 (step 403).After, the channel signal of the pilot bit (Pilot Symbol) of the DPCH of calculation base station of the present invention (DedicatedPhysical Channel) and the common pilot channel (commonpilot channel) of base station is at the adjusted weighted value W of estimating of time slot
t(n) (step 405), this weighted value has phase place P
t(n).Then, estimated mobile unit is at the feedback weight W of same time slot
f(n), feedback weight W
f(n) has feedback phase P
f(n) (step 407).
The present invention is feedback phase P relatively
f(n) and P
t(n), obtain the absolute difference P of phase difference
d(n) (step 409).As absolute phase difference P
dDuring (n) greater than first predetermined value, judgment value is increased by first value, this absolute phase difference P
dDuring (n) less than first predetermined value, then judgment value is reduced by second value (step 411).In this embodiment, first value equals second value.Then, whether compare judgment value greater than second predetermined value (step 413).If this judgment value is during greater than second predetermined value, mobile unit sends and stops the loop mode instruction to base station (step 415), and the indication base station stops the loop pattern.If judgment value less than second predetermined value, is just got back to step 403.
The present invention also provide a kind of in wireless communication system the device of the data downstream pattern of mobile unit decision base station.As shown in Figure 5, the present invention 500 comprises estimation unit 501 and decision unit 503.Estimation unit 501 estimated mobile units are in first feedback weight of first time slot, and this first feedback weight has first feedback phase.Estimation unit 501 further estimated mobile units are in second feedback weight of second time slot, and this second feedback weight has second feedback phase.Decision unit 503 determines the transfer of data diversity mode of base station then by first feedback phase and second feedback phase.
This decision unit 503 further comprises comparing unit 5031, weighted units 5033 and transmitting element 5037.Comparing unit 5031, relatively first feedback phase and second feedback phase obtain absolute phase difference.When absolute phase difference during greater than one first predetermined value, weighted units 5033 just increases judgment value first value.When absolute phase difference during less than first predetermined value, 5033 of weighted units reduce by second value with judgment value.When this judgment value during greater than second predetermined value, transmitting element 5037 just sends and stops the loop mode instruction to the base station, and the indication base station stops the loop transmission diversity mode.
In addition, the present invention further provides a kind of in wireless communication system the device of the downlink mode of mobile unit decision base station, as shown in Figure 6.This device 600 comprises estimation unit 601, computing unit 603 and decision unit 605.Estimation unit 601 estimated mobile units are in the feedback weight of time slot, and this feedback weight has feedback phase.Computing unit 603 calculates the answer weighting of this base station at this time slot, and this replys weighting and has the answer phase place.The boot symbol unit of the DPCH that this answer weighting is the base station and the absolute phase difference of the channel signal of the common pilot channel of base station.605 of unit of decision are by feedback phase and reply phase place, the transfer of data diversity mode of decision base station.
This decision unit 605 further comprises comparing unit 6051, weighted units 6053 and transmitting element 6057.Comparing unit 6051 is feedback phase and answer phase place relatively, obtains absolute phase difference.When this absolute phase difference during greater than first predetermined value, weighted units 6053 increases by first value with judgment value.When absolute phase difference during less than first predetermined value, 6053 of weighted units reduce by second value with judgment value.When judgment value during greater than second predetermined value, transmitting element 6057 just sends and stops the loop mode signal to the base station, and the indication base station stops the loop transmission diversity mode.
By the detailed description of above preferred specific embodiment, hope can be known the feature and spirit of describing this creation more, and above-mentioned disclosed preferred specific embodiment is not the restriction to scope of the present invention.On the contrary, above-mentioned explanation and various change and similar arrangement all are the scope that the present invention will be protected.Therefore, the scope of the claim that the present invention applied for should be done the broadest explanation according to above-mentioned explanation, and contains the possible similar change of institute and the arrangement of tool similitude.
Claims (3)
1. the method for the transfer of data diversity mode of mobile unit decision base station in wireless communication system comprises:
(A) estimate first feedback weight of this mobile unit at first time slot, this first feedback weight has first feedback phase;
(B) estimate second feedback weight of the next one second time slot of this mobile unit behind first time slot, this second feedback weight has second feedback phase; And
(C), determine the transfer of data diversity mode of this base station by this first feedback phase and this second feedback phase; Step (C) wherein also comprises:
(D) relatively this first feedback phase and this second feedback phase obtain absolute phase difference; And
(E), determine the transfer of data diversity mode of this base station by this absolute phase difference;
Wherein step (E) more comprises:
(F) when this absolute phase difference during, judgment value is increased by first value,, this judgment value is reduced by one second value when this absolute phase difference during less than this first predetermined value greater than first predetermined value; And
(G) when this judgment value during, send and stop the instruction of loop transmission diversity mode to this base station greater than second predetermined value.
2. the method for claim 1, this first value equals this second value.
3. the device of the transfer of data diversity mode of mobile unit decision base station in wireless communication system comprises:
Estimation unit is estimated first feedback weight of this mobile unit at first time slot, and this first feedback weight has first feedback phase, and estimates second feedback weight of this mobile unit at second time slot, and this second feedback weight has second feedback phase; And
The decision unit by this first feedback phase and this second feedback phase, determines the transfer of data diversity mode of this base station; Wherein this decision unit further comprises:
Comparing unit, relatively this first feedback phase and this second feedback phase obtain absolute phase difference;
Weighted units, when this absolute phase difference during greater than first predetermined value, this weighted units increases by first value with judgment value, and when this absolute phase difference during less than this first predetermined value, this weighted units reduces second with this judgment value and is worth; And
Transmitting element, when this weighted value during greater than second predetermined value, this transmitting element sends and stops the instruction of loop transmission diversity mode to this base station.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101086602A CN100397804C (en) | 2002-12-16 | 2002-12-16 | Method and apparatus for deciding base station transmission diversity mode |
| CN 02156095 CN1250030C (en) | 2002-12-16 | 2002-12-16 | Method and apparatus for determining transmission diver sity mode for base station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02156095 CN1250030C (en) | 2002-12-16 | 2002-12-16 | Method and apparatus for determining transmission diver sity mode for base station |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101086602A Division CN100397804C (en) | 2002-12-16 | 2002-12-16 | Method and apparatus for deciding base station transmission diversity mode |
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| CN1250030C true CN1250030C (en) | 2006-04-05 |
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| CN 02156095 Expired - Fee Related CN1250030C (en) | 2002-12-16 | 2002-12-16 | Method and apparatus for determining transmission diver sity mode for base station |
| CNB2005101086602A Expired - Fee Related CN100397804C (en) | 2002-12-16 | 2002-12-16 | Method and apparatus for deciding base station transmission diversity mode |
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| CNB2005101086602A Expired - Fee Related CN100397804C (en) | 2002-12-16 | 2002-12-16 | Method and apparatus for deciding base station transmission diversity mode |
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| CN103391128B (en) * | 2012-05-07 | 2017-08-18 | 华为技术有限公司 | A kind of virtual-antenna mapping method and device |
| US10756784B2 (en) * | 2018-04-03 | 2020-08-25 | Qualcomm Incorporated | Feedback of beam repetition and diversity mode |
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| ES2224667T3 (en) * | 1999-05-19 | 2005-03-01 | Nokia Corporation | METHOD AND SYSTEM OF DIVERSITY OF TRANSMISSION. |
| KR100316777B1 (en) * | 1999-08-24 | 2001-12-12 | 윤종용 | Closed loop transmit antenna diversity method, base station apparatus and mobile station apparatus therefor in next generation mobile communication system |
| US6839326B1 (en) * | 2000-09-26 | 2005-01-04 | Nokia Corporation | Antenna phase estimation algorithm for WCDMA closed loop transmitter antenna diversity system |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN100397804C (en) | 2008-06-25 |
| CN1509095A (en) | 2004-06-30 |
| CN1770656A (en) | 2006-05-10 |
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