CN101174861A - Antenna adaptation in a time division duplexing system - Google Patents

Abstract

A technique for steering a directional antenna such as may be used with User Equipment (UE) in a wireless communication system. Optimum angle settings for the directional antenna are determined as different values for an uplink and downlink; that is for simple reception and simple transmission. Thus, rather than determine compromised directions that are picked in an attempt to optimize transmission and reception with the same directional setting, directional settings may be optimized independently. The invention is of particular use in a Time Division Duplex (TDD) system where transmit and receive functions can be operating independently at different times. In further aspects, an optimum direction is determined by estimating an interference signal power which is detected from signals emanating from adjacent base stations (access points) and determining a directional setting that minimizes interference to adjacent cells based upon such measurements. A further level of sophistication in antenna angle setting, is to monitor the loading of adjacent cell sites base stations and turning interference and determine the settings accordingly to minimize interference to such heavily loaded neighbors. Further aspects of the invention adapts to acquisition modes that accommodate the directional setting in active use of the system.

Description

Antenna adaptation in the time division duplex system

The present patent application is that international application no is PCT/US03/14578, and international filing date is on May 7th, 2003, and the application number that enters the China national stage is 03810255.2, and name is called the dividing an application of application for a patent for invention of " antenna adaptation in the time division duplex system ".

Background of invention

Dissimilar wireless data communication networks, comprise digital cellular system, WLAN (WLANs) and or even individual's LAN, as bluetooth, little by little be considered to be the desirable mode of connection of a lot of different applications.These can be in order to the access of access, mobile computer and the personal digital assistant (PDAs) that are provided at the personal computer that has radio installation in the home network, and is provided at the solid and access easily on commercial the application.

Certainly, according to a present estimation, about 10% notebook computer has been equipped with wireless adapter card when dispatching from the factory.And it is said and a estimate to point out that this ratio will be increased to 30% in 2 years.The manufacturer of some microprocessors, for example Intel is occupied in wireless ability is incorporated on the processor chips platform.By such and other initialization continue will lead wireless device to be incorporated on the computer of form of ownership.

This is actually in some cities and may finds " popular place ", can obtain the binding of many different network types simultaneously at this place.Unfortunately, if need not 100, as long as 10 spatially approaching networks will mean that interference will become a problem.That is to say, though, the most emerging wireless standard provides solid transmitting-receiving signal or uses a code division multiple access (CDMA) to overcome this subcarrier with the frequency spectrum microwave frequency modulation that distributes, therefore yet being crowded with microwave spectrums of reading has still increased noise and has also reduced all users' effective utilization.

This capacity that uses a frequency to reuse the cdma network of the factor (frequency reuse factor) is limited by the interior interference of between this sub-district and sub-district.Similarly be that multi-user detecting (MUD) can be used for relaxing intramolecular interference.And the intelligent management of channel power, coded text and time slot technology such as (that is to say solid microwave resource management (RRM)) also can be utilized.

Most interested in the present invention is that it also is possible utilizing a directivity or adaptive antenna to decide the direction that transmits with the best that receives signal.This directive antenna focuses on the power of these signal institute radiation so that and the interference between other the transmission can minimize.

One interference that can be used for relaxing between the sub-district is to be the directive antenna at rotary type (long-range) or so-called use side.For understanding the advantage of doing like this, base station that consideration one is close to or the situation that from central base station transmission receiver (BTSs) to the channel of the forward link of this subscriber equipment end, causes the section of presence of intercell interference.If these down chain (DL) channels separation of having an angle between the base station of the base station that links between this desire or section and these phase mutual interference or section, the directive antenna at the subscriber equipment end can provide the interference of some degree to suppress so.The front of this certain inhibition degree and this angular separation, antenna is relevant to the electric wave width of the ratio of back and this antenna.

Also cause in the interference between the sub-district on cochain (UL) or the inverse direction in the contiguous sub-district or the user of section.Most transmission energy can directly point to base station that desire links and away from the sub-district or the section of this vicinity, this antenna also can be provided in the inhibition of the interference between the sub-district on the cochain so if this directive antenna can point to.This interference suppresses to appear him on the base station receiver that desire links itself be the reduction of disturbing for.

Therefore the use of this directive antenna is directly to contribute to the improvement that links plan of distribution.He provides than the omnidirectional antenna of standard with the operation of a directional mode time, extra antenna gain.According to the calculation that is used to guide, this extra gain can directly contribute on the plan of distribution of this cochain and following chain.This directive antenna is because the refraction in zone has also reduced the strong and weak uneven influence of signal.The directive property of this antenna is only approved by the some of regional environment to the path structure that arrives at this receiver input, is reduced the strong and weak indefinite degree of this signal.Therefore the strong and weak indefinite edge of this required quick signal also is lowered.

Yet, must guide a suitable direction for this cochain and following chain for this directive antenna is become the most initiatively.In frequency division duplexing (FDD) system of packet switching, the direction of this cochain and following chain must be the same, and equally this UL and this DL carrier frequency are actives simultaneously.One compromise direction is so usually selectedly is used for the reception of optimization on this two direction.

Yet a time division duplex (TDD) has some advantage compared to the FDD system when it relates to antenna guide:

Because this subscriber equipment is semiduplex, DL and UL pointing direction can be different to allow the optimized direction under each individual cases.

Because DL operates in identical frequency traditionally with UL, under the situation of majority, this DL will be the same with the UL path loss.

The frame structure of this TDD be for time slot with obtainable non-active with the antenna direction of test replacement with calculate this antenna guide and measure yardstick.

Summary of the invention

The present invention is relevant with an antenna settings one optimization direction in a wireless telecommunication system.This system has the spontaneous bootable antenna that can select several different angle initializations.This antenna is the setting that at first is set to a candidate.One measurement yardstick is to set with this subsequently to measure, and this measurement yardstick is relevant with the use of present this candidate's setting in a day, for example, and by determining in the relevant quality of this candidate's the signal that setting received.Such measurement yardstick takes out at least two different candidate's settings subsequently, and a best setting or an optimized setting result determined then.This program determines an optimized setting by the different measurement yardstick at intrasystem different communication channel then.In more detail, this optimized setting is that decision is by using a measurement yardstick that is different from the communication channel that operates in down chain direction to decide this to operate in the optimal setting of a communication channel of upper link direction.Therefore the present invention can cause the decision with the optimal setting that is used for different cochains and following chain channel.

Though having a less or more direction mode, can use by this antenna, but in preferable specific embodiment, should comprise at least one omnidirectional mode by candidate's setting that this guidable antenna provided, a right pattern and a left are to pattern.

The reception period that measures yardstick and be traditionally at suitable signal measures, and this suitable signal can be the pilot channel signal, but also can obtain in the signal by other form, for example the data carrier signal.The present invention particularly in a time division duplex (TDD) system, has advantage especially, because this measurement yardstick can take out during the time slot of non-active.In addition, because in typical TDD system, no matter be that cochain or following chain all are initiatively in each given time slot, therefore, cochain is whole with the system of following chain communication channel to be easier the decision.

At extra section of the present invention, it is to use the optimal antenna that this determined to set to select different gain adjustment factor.This gain adjustment factor is to indicate with to operate in the specific path loss of deciding the relevant system of direction mode relevant, and this gain adjustment factor then is applied to revises the computing that this institute transmits the power controlling level of signal.Therefore, for example typically control in order to set this cochain and the loop circuit power that the power level of this time chain is set that to calculate be in order to adjust this one and one specific relevant antenna gain of optimal setting.

Further, this optimized directivity is set and can be stored in a buffer, and internal memory or other storage device and the synchronous time slot of initiatively assigning with known are read.Therefore, a system that needs this antenna cause one given time slot to be guided in a specific direction can be easy to be directed to another optimization direction in next contiguous time slot again.

Other parts of the present invention are initially to obtain pattern for directing into optimization one.During an initial sense mode, system parameters is to decide with the antenna of setting in an omnirange.Yet an extra program groups is to be executed in more primely after the initial detecting, thinks that this transmission subsequently determines the orientation angle that this is best.Under this situation, be to be adjusted to reach identical susceptibility on the project of the expected path loss of maximum by measurement obtained during this omnidirectional mode, just as this original search is to guide by a directional mode.This susceptibility improvement factor is to determine by the gain difference between an omnirange and directional mode, and the measurement during program subsequently too.This some of the present invention considers that the extra gain of a directional mode is to be used to provide the coverage rate that still increases of this system.

Description of drawings

Other purpose, feature and advantage aforementioned and of the present invention will be by following description about specific preferred embodiment of the present invention, and the complete various graphic explanation that is accompanied by about same section comes clearer explanation.Each icon does not need specific size, but is emphasizing principle of the present invention.

Fig. 1 is used for carrying out the block diagram that time division duplex microwave transmission of the present invention connects device for one.

Fig. 2 be for an antenna microwave pattern to explain three different selectable modes.

Fig. 3 is the different power level that is used to present cochain and following chain under the typical scenario.

Fig. 4 explains how this recipient signal strength and the measurement of disturbing signal strength obtain by this receiver.

Fig. 5 is the assignment that presents a typical cochain and following chain, set to explain the directivity during this cochain needs other time slot during the time slot of some assignment, and such measurement also may by assignment but obtain in the time slot of non-active.

Fig. 6 is in order to explaining that a time slot pathloss calculation device can be used for developing a gain relationship of adjusting aerial position, and it can be applied in power control of loop circuit in regular turn.

Fig. 7 is the more detailed flow chart for chain (DL) antenna direction calculation once

Fig. 8 is a high-grade flow chart, can be applied to power level setting control to illustrate that this forward path loss links.

Fig. 9 is the calculation of a cochain (UL) antenna direction.

Figure 10 explains how this time slot is used for defining this cochain and following chain.

Figure 11 (A is to D) explains in different switchings to point in the configuration in order to distribute the different scheme of this cochain and following chain time slot.

Figure 12 is more detailed explain an array controller and a possible time slot assignment.

Embodiment

Being described below of of the present invention one preferable specific embodiment.This special specific embodiment is to be used for a cellular-based wireless communications system, this system is known by people with wideband sign indicating number part multiple access (W-CDMA) of the quick rotation telephone system (UMTS) of general usefulness, and it is the specification that is described in detail in the T1.3Gpp.25 series of telephonic communication industry association (TIA); Yet, should be appreciated that principle of the present invention can be applied to the wireless telecommunication system of other form.

Fundamental operation

In any cellular system, be used for and remote unit or subscriber equipment communication all over the base station transmission receiving station (BTS) or the access point (AP) that all have central authorities.Any such system all is two-way in itself, that is to say that it must provide (following chain) and the ability to communicate from UE to this BTS (cochain) from this BTS to this UE.The duplex of this cochain and following chain communication channel can be carried out in two main modes.These are to be frequency division duplexing (FDD) and time division duplex (TDD).The carrier frequency that this FDD separates is in order to help the communication of this cochain and following chain.At this time division duplex (TDD), the band width that communicates is to be used for cochain and following chain.Yet as if with this cochain of TDD being active during some time slot, this time chain is active during another section then.And the communication channel between from user to user can be in the time slot that separates (TDMA) or can be in code division multiple access (CDMA) the time modulate.Therefore TDD/CDMA and TDD/TDMA are found in the present use for the access method on basis.

For the TDD system, this propagation channel is for mutual, the loss that is to say the path in this channel all can be identical on the direction of transfer from BTS to UE and from UE to BTS with the stable statistics of electric wave power, because identical carrier wave coding frequency is to be used in this two direction.

Focus is forwarded on Fig. 1, and in this equipment (UE), the use of the transmission receiver of a typical TDD/CDMA form is to be shown on this high-grade figure.This transmission receiver comprises an antenna 10, one receiver subsystems 20 and a conveyer subsystem 30.

According to preferable specific embodiment of the present invention, this antenna 10 is the antennas for a direction formula type.Therefore its radiating element 12-1 that comprises multitask is connected to a directivity controller 14 to 12-n.This directivity controller 14 is accepted the control input and is transmitted or receive direction to set one of this antenna element 12.This direction is that controller 14 can comprise switch, phase deviation device or other assembly such as block impedance and different and directivity influence the combination of this antenna module 12 at the whole bag of tricks known in the art.

One duplexer 18 suitable transmission/receiving key 18 that is regarded as under the situation of a TDD system is connected to this antenna subsystem 10 to allow this recipient 20 with this conveyer 30.

Homophase and orthogonal type demodulator 28 that this receiver 20 comprises a reception amplifier 21, microwave frequency (RF) download transducer 23, voltage-controlled oscillator (VCO) 22 and comprises a phase deviation device 25, a pair of blender 26-1,26-2 and a pair of band filter 27-1,27-2.In a method known in the art, reception amplifier receives signal, amplifies this signal and provides this amplification signal to download transducer 23 to RF subsequently.

Select a given incoming frequency the input 24 from this VCO 20 with possible frequency band, this RF downloads the microwave energy of transducer 23 these incomes of skew to middle carrier (IF) frenquency signal.This i/q demodulator 28 provides subsequently and receives data symbol with as the output in homophase (I) and quadrature (Q) channel.

And about this conveyer 30, this transmission data symbol provides an I/Q modulator 38, and this modulator itself comprises a pair of blender 31-1,31-2 orthogonal type phase deviation device 32 and a summation instrument 33.Supply with by a regional related signal, this I/Q modulator 38 provide one at the modulating signal of IF frequency to the RF upconverter.This accepts VCO 35 and any frequency band selects input 36 to go up the RF carrier frequency that this IF signal of conversion links to a desire subsequently.This transmission amplifier 37 is controlled in order by transmission reception (T/R) input subsequently and is provided the transmission signal of this modulation to arrive this duplexer 18.One level detector circuit 38 can be used for detecting the RF power level of this transmission.This T/R input is to control according to the distribution of the time slot that the base station provided in a control channel.During some time slot, this duplexer 18 is to set a receiving mode (that is to say down that chain is initiatively) for; Other time its be set to transfer mode (that is to say cochain be initiatively): and it remains to keep and is opening (time slot of ineffective treatment just) in the time at other.One identical level circuit for detecting 29 can be with deciding this incoming level detection signal level.

According to this special specific embodiment, this antenna subsystem 10 has three selectable patterns by the control input 16 of directivity.Focus is rotated back into Fig. 2, and these patterns can be omnidirectional mode, and wherein these antenna 12 normal runnings are provided at the omnidirectional transmission/reception pattern that all azimuth directions have quite consistent intensity down.Come the 2nd pattern of the antenna 10 of illustration to provide a common dexter microwave pattern with dexter pattern 41 over against this azimuthal plane.Same, the 3rd setting of this antenna 10 provides one usually over against the antenna pattern of the left-hand side of this azimuthal plane.Therefore, by the suitable input that is applied to this directivity controller 16, this antenna 10 can set for three directing modes (omnirange, right-hand side direction or left-hand side direction) one of them.Use the antenna system of this setting to be well known in this area.For example, the U.S. Patent Publication No. NO.2003/0048226A1 that can be applied for reference to Tantivy communication (its also for assignee of the present invention).Although this specific embodiment only uses three antenna modes, should understand other specific embodiment and also can use more pattern.

Fig. 3 illustration in a cellular wireless environment, the general situation that is used of transmission receiver base station (BTSs) of central authorities.This subscriber equipment (UE) device normally the position at a specific cell 39-1 in the corner.This subscriber equipment can be detected the main BTS 51-1 of pilot channel signal of a power level P1 under these circumstances.Yet, also may detect and other contiguous BTSs, for example the BTS 51-4 signal related of the BTS 51-3 of BTS 51-2, the power level P3 of power level P2 and power level P4 this subscriber equipment.Therefore identifiable is that BTSs 51-2,51-3 and the 51-4 of this vicinity all can contribute to the relevant interference of signal with the desire binding that is received by predetermined BTS 51-1, and may interfere with the transmission the BTS 51-1 that is scheduled to it from UE.Therefore, the directivity essence of this antenna 10 is listed in the different settling mode of considering and to be used for the usefulness of optimization whole system.

The calculation method that the present invention developed utilizes one to receive the measurement of signal power and measure the interference signal power at this UE.These can provide by extra receiving circuit as shown in Figure 4.This receiving circuit 60 can take out this reception I channel (RXI) and be input to a typical power detecting device 61 with this reception Q channel (RXQ) and with them.The demodulator 62 that this RXI and RXQ signal also can be imported into input CDMA password initiatively is with as special channel.Therefore this demodulator 62 provides the measurement of a reception cipher signal power (RCSP).

Estimation as for the reception interference power relevant with contiguous base station 51-2,51-3,51-4 can provide by extra demodulator 63-1,63-2...63-P, sum total circuit 64 and subtraction circuit 65.That is to say, apply the demodulator of the CDMA password (this password is to be used for the channel that use this UE position at present) of ineffective treatment by using this from BTS 51-1, such sub-district in the interference channel relative signal power be that other provides by the sum total that it is taken out in summing up circuit 64.This interference power is by removing (by subtraction circuit 65) in the whole received power to estimate the cryptochannel signal strength (ICSP) of this interference subsequently.

Can understand the present invention now will need to select on cochain and following chain direction for each specific active time slot the setting of an optimal antenna pattern.Fig. 5 is the icon for the high level under this situation.Once chain time-histories Figure 70 is with cochain time-histories Figure 75 illustration.A this time chain time-histories Figure 70 and a UTMSWCDMA time slot are allocated as follows.One time slot has one and omnidistance continues the time of 10 microseconds (ms) and it is separated into 15 time slots (ts), and this time slot is 2560 times for the encryption chip time (tc) of per second 3.84 1,000,000 chips (Mc/s).Therefore a time slot corresponds to 2560 chips of CDMA distribution password.The entity capacity of this time slot is can fill up one corresponding to the length described in the sub-clause of 5.2.2 in the W-CDMA specifications.Each time slot can be distributed into cochain (UL) or following chain (DL).With such elasticity, this time division duplex ability goes in the different environment and scheduling scheme.In any configuration, in each time slot, have at least a time slot to distribute and be used for cochain, have at least a time slot to distribute and be used for chain down.

Therefore the situation of one embodiment can develop as shown in Figure 5, and wherein this adjacent time slot 71-1 and 71-2 are optimized left pattern and the right patterns pointed in regular turn.One subsequently time slot 71-3 may be by making this antenna position optimization under omnirange is set, and ensuing time slot 71-4 (being connected on after the idle time slot) may need optimization ground to point to left pattern.Same, in a upper link direction, adjacent time slot 72-1,72-2 and 72-3 may need to set this antenna respectively at the right side, omnirange and right pattern.Can take out from Fig. 5 that to realize be aerial position relevant with U.S. one initiatively time slot and invalid time slot,, also can be used for obtaining measured value according to this present calculation for example as 71-5 that does not change shade and 71-6.

This application is not only to cause this aerial position optimization according to the whole result of algorithm of the present invention, and a pathloss calculation of revising also can obtain.In more detail, as shown in Figure 6, a time slot pathloss calculation device is being to be used to provide a relevant path loss of setting with omnirange of reception antenna traditionally.Yet, because the gain of this antenna according to he directional mode and difference to some extent, in order to revise any estimation of going up the joint path loss, the correction step 81 of an antenna gain should be put into.Therefore, a given antenna gain correction 81 can be used for revising this cochain path loss estimating in the setting of an aerial position, and this is estimated with being applied to loop circuit power control calculation 82 subsequently.Therefore the present invention not only provides a sensitivity that increases progressively in the reception of signal, and further provides an advantage to come this loop circuit power control program of optimization.

Fig. 7 is the flow chart of steps that decides an optimization antenna for a usefulness, it can determine the best angle in following chain (DL) direction to set, and that is to say that it is to be used at the subscriber equipment end by transmitting the reception signal that receiver base station (BTS) (specification at W-CDMA is also referred to as Node B) is transmitted that this best angle is set.

At the first step of this method, be the assignment that obtains time slot.These assignments are at the active time slot of the assignment in following chain and the non-active time slot of assignment, as shown in Figure 5.It provides the sum of a time slot subsequently, and this time slot will be monitored in program.The assignment of this time slot traditionally will be by Node B or other central controller to be applicable to present subscriber equipment and to be examined the finishing of method of situation about knowing according to this Node B.

Next state 92 that is used for this RCSP and ICSP is to measure to be used for each antenna mode with the step of each monitored time slot of state 94.Therefore, this antenna 10 is temporarily to be set in each of these three patterns (omnirange, the right side or left pattern), and RCSP and ICSP have been determined.

In state 96, should may come filtering through suitable low pass filter and/or average computation subsequently at the RCSP of each antenna mode and the measurement of ICSP.

Transmit the Node B that these measurements are got back in a report subsequently at state 98 these subscriber equipmenies (UE).These will comprise at least RCSP in order to the time slot that measures this active and this ICSO in order to the time slot of this active of tie-in with non-active.This allows Node B to determine the signal in the time slot of this active and the ratio of interference.By this information, he is because of giving this subscriber equipment (UE) assigning time slot initiatively according to observed ratio to signal and interference (SIR) in being taken out by different antenna settings.

At this state, sensing that should the best in state 102 can decide by calculating this SIR, is used for the time slot of active and non-active to the ratio of ICSP with decision RCSP.That is to say that this RCSP takes out for initiatively time slot, and the measurement of this ICSP is to be taken out by the time slot of this non-active (its be known have only the signal of interference to occur).By such mode, the antenna settings an of the best is no matter be that omnidirectional mode or left and right pattern can be by determining in the measurement of taking out.

In following closure, be used for RCSP that other antenna direction sets and ICSP initiatively the time slot measurement can suitable signal and also one for example ought not have important user data doubly to transmit one during take out.Perhaps, this can take out during the transmission of guiding synchronization or similar signal, but should be appreciated that this measurement also can be by data signals or taking-up in other cases.

After the given directivity of this antenna was set, this forward (DL) path loss can subsequently can be estimated, as shown in Figure 8.That is to say that the gain line of a given antenna can obtain.The antenna gain of this renewal is set can be subsequently in order to revise forward path loss (FPL) estimation, and this estimation is used in the circulating power control calculation, as state 106 subsequently.Shown in same embodiment, a cochain (that is to say the reverse path loss) can obtain according to the measurement of chain (forward) loss down, and this is common situation in circulating power control calculation.In case its power level of transmission and the power level of the signal that a remote unit is received (report of going back along with transmission) are known in this base station, it just can calculate subsequently has can be via the Lu Jingzhong loss that transmits for how many energy.General power control calculation must be estimated this cochain (inverse direction) path loss according to the measurement of this time chain subsequently.Under this special situation, this antenna will be gone through different gains according to its angle initialization, and this angle initialization can be used to provide a yield value of revising and rise subsequently in order to revise this cochain path loss.

Think deeply an other method, this estimation that is used for the path loss on this two direction all must be revised.The adjustment of this forward link is the antenna gain that is used to estimate path loss in order to correction.Secondly, the adjustment of a reverse link is the reverse link transmission power level setting that is used to revise in the reality of subscriber equipment end, and is attempting being transmitted back to this base station by the subscriber equipment end next time.

Fig. 9 is a flow chart, can determine that according to the order of its step one is used for cochain, that is to say when the orientation angle of subscriber equipment end in order to the best of transmitting.In step 150 at first, the measurement of an adjacent area interference is determined by all orientation angle.That is to say that this common control channel signal that is used for contiguous BTS (51-2,51-3,51-4) is measured by all orientation angle.In state 152, a direction is to be selected to make it during transmitting, and maximizes the binding power of the BTS 51-1 that itself and this desire links, and minimizes itself and contiguous BTSs 51-2,51-3, the interference of 51-4.That is to say that this subscriber equipment determines this reverse link path loss to adjust this BTSs and to calculate one subsequently from the interference level that this UE was transmitted, to be used for each possible angle initialization in state 150.This whole best angle is selected as maximizing the power of this base station 51-1 that links to desire subsequently and minimizes this annoyance level to the adjacent degree of other contiguous base station 51-2,51-3 and 51-4.This notion with further detailed description in the following specific embodiment that is used in UMTS W-CDMA of the present invention.

In the scheme that substitutes, perhaps the base station of the base station that this is adjacent load also can be monitored in step 154.That is to say that the data that some are indicating its relative busy degree may periodically be broadcasted in each base station, that is to say that the time slot what are arranged is initiatively within it.If in state 156, a contiguous base station is detected special busy, then in step 158 subsequently a direction be to be selected to reduce this interference to its specific adjacent domain.Therefore, for example this subscriber equipment (UE) can judge that a contiguous base station 51-3 is specific having much to do, and allows its most time slot be assigned to the state of an active.If this specific adjacent domain is than relative busy in other contiguous base station, and if particularly present this base station of assigning not be special busy, a direction will be selected to be reduced to the interference of the base station in this busy zone so.Therefore this can be between the base station 51-1 that links between this UE and this desire improves the system effectiveness of integral body with the attenuating of the minimum of the binding that links to this desire.

Again, even in upper link direction, this pathloss calculation will be adjusted with on the difference that is used in cochain and the gain of following chain antenna direction setting, as shown in the step 160.

Figure 10 illustration one cochain and following chain direction may be used to the situation of duplex system, that is to say that this system connects and all formula actives during each time slot of connection time slot down last.Yet, other be common and also may be as Figure 11 (A), Figure 11 (B), Figure 11 (C) and Figure 11 (D) shown in.These figure present the time slot allocation of cochain and following interchain respectively, its be respectively with the cochain of symmetry with under be connected branch and be used in several switching point configurations, with asymmetrical cochain with under be connected branch and be used in several switching point configurations, with the cochain of symmetry with under be connected branch be used in single switching point configuration and with asymmetrical cochain with under be connected branch and be used in single switching point configuration.

In a TDD system, some classification of some this array guiding therefore quilt be reached with in order to carry out this best antenna settings.If software is enough fast, the guiding of this array can transmit message by software and carry out to this directivity control input 16.Yet if this software can't reach fast execution, a hardware state machine that operates under this software control needs.This array is set the shared processing device can be as the simple value that comprises next time slot of buffer.In such specific embodiment, this is held and can be read out in the correct time.

One more complicated ACSP may need several to comprise the buffer that is used for setting to the numerical value of following N array object location.This software can write this buffer before arriving in that this time slot is actual.At correct time point, this ACSP will use these controls that are set in antenna array subsequently and import 16.

The embodiment of one more complicated ACSP will be as shown in Figure 12, and the identical running in this multiple position is to this above-mentioned controller, but consider several buffers, this each all be contained in the applied set point of different time points.The execution of such ACSP has several buffers and comprises the time slot that the buffer that is used for receiving mode (following chain) and transmission (cochain) are assigned.This array buffer can once be set at one time simultaneously, or each is revised as required.It also can be double buffering considering writing of going up at any time, and control by the time restriction of software again.

As suggested in figure 12, the present invention confirms that further the assignment of cochain time slot can be offset at interval by the regular time of being assigned from this time chain.In this environment, a duplexer 18 will be set between the transmission and receiving mode that always switches in a preset time.Shown in the time diagram among Figure 12, a specific subscriber equipment (UE) that is recognized as unit numeral 1 will be in this first time slot of explaining at chain direction down initiatively, and can active after two time slots of chain direction down.This ACSP logic will therefore always know in the time slot that replaces of the beginning of a time slot, switch on transmit and receiving mode between.Adopt a severeer a little structure in the assignment of this cochain and the time slot of following chain, because of can be to contribute to this ACSP framework of simplification.

The description of UMTS-TDD

The reader will realize a more detailed description now and how be used in the UMTD-TDD system environments to understand the present invention.Following discussion will suppose that this reader is so that specification of the present invention and defined different channel are had gained some understanding.

1. stable state

As defined in the W-CDMA specification of above-mentioned institute reference, this stable situation is to be CELL_FACH or CELL_DCH.This CELL_DCH be for a state wherein this UE be devoted to sound and or data traffic on one's own initiative.The distribution of DL and UL time slot/encryption/power can change under RRM control and this UE can be a rotary type.This CELL_FACH is that wherein this UE is not with the resource of distribution for a state, and the measurement of noise is reported to be used for the distribution of a future by RRM, and this UE can be a rotary type.

1.1 following chain

The hypothesis of calculation notion that is indicated in Fig. 7 and the detailed following DL of being used for direction, this antenna 10 are to guide according to the ratio (SIR) of the interference in this signal of maximization and the adjacent sub-district/section.As the front simple the description, the measurement of making signal (RCSP) that decision needs one desire of guiding links and contiguous area interference (ICSP) according to this SIR is with the time slot (those are the transmission traffic of this UE) that is used for this active and the time slot of non-active.Be used for the initiatively measurement of the SIR (RCSP/ICSP just) of time slot, need as this UE be rotary type and/or the distribution of time slot keep the guiding direction of its best during perhaps in contiguous section or the fair and unbiased change in sub-district.It is because of needs are used to the guiding direction that provides correct that the SIR that is used for non-active time slot measures, if this time slot should it be mixed in the future a branch and become initiatively.The measurement of RSCP (the signal coding power of reception) is used for this P-CCPCH signal and ISCP (disturbing signal coding power), and to be used for special-purpose time slot be to be used traditionally.

1.1.1 the RX signal power measures

The measurement of signal power be with by this UE at other a RRM function or a general control channel guidance signal, the support of P-CCPCH RSCP is made.The measurement of this P-CCPCH RSCP of additional needs of the UE antenna of one directivity might be made on the antenna direction direction in institute.If the antenna of a three-mode is used for this UE, the measurement of this P-CCPCH RSCP must be with omnidirectional mode, and left electric wave and right electric wave pattern are made.The measurement of this P-CCPCH RSCP is only to carry out on time slot, and on this time slot, this UE receives data (CELL_DCH) on telecommunications or broadcast channel.This measurement will be used to selected three electric wave positions (omnirange, left and right) one of them.When this UE does not need to be used for receiving data, the measurement on other two direction can be made in P-CCPCH, because the SIR on these directions may can be to reduce level compared to present direction.Because this P-CCPCH is always transmitted with the omnidirectional mode antenna for base station by this base station, this P-CCPCH will be identical with the received power of the active time slot of this P-CCPCH on this identical direction (supposing that this time slot is to close in real time and suppose that some average quantity is to be finished by step 96 (Fig. 7)) in the measurement of the received power during the non-active time slot in other position.

Measure 1.1.2 disturb between the sub-district

Interference between the sub-district measures to be measured via time slot ISCP in the support of RRM by this UE and makes.For this purpose of discussing, ISCP assumes intermolecular interference power only is provided.The UE antenna of this directivity needs this time slot ISCP to measure to be needed to make in the directing mode direction of all possible antenna.If a three-mode antenna 10 be used in this UE, therefore the measurement of this ISCP will be made for each possible interference password with omnirange, left electric wave and right electric wave pattern.For this initiatively measurement of time slot, this measurement can be only in present sensing position (though, guide this antenna will upset the receiver of an active channel) make.By definition, the SIR that other position that is used for time slot initiatively will have a reduction degree goes to receive data (CELL_CH) with the position of attempting may tending to reduce at other usefulness.

1.1.3 RX signal power report

For power control and for the purpose of DL and UL time slot allocation, this microwave Crypto Control Unit (RNC) is also periodically reported in the measurement of this P-CCPCH RSCP.Formed by RSCP by a directive antenna such as 10, three different measurements of three-mode array.Three whole measurements are to be used in UE to be used for decision on the pointing direction of antenna this future, but have only the measurement of the RSCP of present pointing direction to be reported to this RNC.The measurement of this undressed RSCP is met with the filtering (step 92) of varying level before in them as report (step 98) by this UE.This RSCP is the measurement of all direction, no matter whether it is used for as report, is all to come filtering in the mode that is same as present execution.This report is to utilize relevant average of the present pointing direction of this and this.

1.1.4 jamming report between the sub-district

The measurement of time slot ISCP reports periodically that also this RNC is to make the purpose that this forward channel (DL) is distributed.This RNC describes this time slot that will be measured in detail.With this three-mode directive antenna, three different measurements by the ISCP composition to be used for each time slot.If the report of this ICSP time slot is to be used for initiatively a time slot (time slot is utilized by this UE), the ISCP value of this report is that the pointing direction by line line today is taken out.If the report of this ISCP time slot is the time slot that is used for a non-active (one consider assign in the future time slot), the ISCP value of this report is to provide the direction of the antenna of the highest SIR to be taken out by this.The measurement of this undressed ISCP is suffered from the filtering of varying level before in them as report by this UE.This ISCP is the measurement of all direction and all time slots, no matter whether it is used for as report, all is to come filtering in the mode that is same as present execution.This report step 98 therefore be utilize the present pointing direction of this and this relevant on average respectively in initiatively time slot ISCP newspaper, and be somebody's turn to do directivity with the SIR of maximum relevant on average be that the ISCP time slot that is used for non-active is reported.

1.1.5 the pointing direction of active time slot

At present the pointing direction of this UE antenna is to decide time slot or all pointing directions to be used for this active by calculating this SIR (RSCP is to the ratio of ISCP).This aerial position is subsequently prior to being adjusted to point to the direction at its highest SIR before this next time slot.In order to the RSCP that reports this active time slot and ISCP value will be that these are with deciding this SIR to determine the value of selected direction.Should be noted that, if Node B (the transmission receiver base station that this is assigned) itself is to utilize directivity electric wave old times antenna, the SIR that should be calculated by the calculation of this antenna guide will can be not the same with the SIR that is kept by threshold in forward link control, because the RSCP of this P-CCPCH will calculate with the base station under omnidirectional mode.Yet, because this directive antenna is the area interference that reduces this vicinity, this SIR tends to cover pointing direction with Node B in the transmission of omnidirectional mode, and this should tend to cover pointing direction with Node B with the transmission of the electric wave on the early stage relevant item just as this SIR.

1.1.6 the pointing direction of non-active time slot

Each DL time slot by the non-active that this UE measured will have a pointing direction independently.The pointing direction of this non-active time slot is for the direction of this highest SIR is provided.If non-active time slot is to be assigned to this UE, this aerial position is to be adjusted subsequently to point to the direction of this highest SIR, only prior to this time slot.This time slot is to be considered to be time slot initiatively subsequently.

1.1.7 forward path loss

What Fig. 6 mentioned, the integration of this directive antenna influences the calculating of forward path loss, because have a gain difference between this directional pattern and this omnirange pattern as us.Switch between an omnidirectional mode and a directional mode along with this adds now, it can compensate unless this forward path loss will manifest change.Difference in this gain can be according in RSCP being that difference between each the measurement of two directional mode is calculated for the measurement of omnidirectional mode and in RSCP.The difference of this gain should be measured rather than is estimated, because accurate gain difference is based on the angle that this directive antenna arrives between this omnidirectional mode and the directional mode.

1.1.8 loop circuit forward power control

When this antenna direction was the time slot change of an active, the integration of this directive antenna also influenced the control of this forward (DL) power.The control of this forward (DL) power may see that the stage in forward power changes and be prior when this position is adjusted, and the stage in SIR changes.If aerial position has changed, new position will have a SIR (otherwise this aerial position can not change) higher than the present position.When aerial position changes, the time this tendency will be used to forward (DL) power control circuit to reduce power.This reduction will betide in certain period.During during this period of time, this binding will operate in that (preferable binding) recovers up to the control of this forward (DL) power on the SIR on this mark ground.And between the adjustment period of forward (DL) power control circuit, this RCSP that is used for time slot measures average can be continued, because these measurements are to make in P-CCPCH, it is to transmit with a fixing power.

This this UE has assigned under the situation of chain time slot under the multitask, and the direction of each time slot can be different.Because this each time slot, or even the SIR of omnidirectional antenna is different, and it is to assume this forward power control to keep one group of each variable of chain (DL) time slot down, has made this binding performance to keep independently at each time slot.So this directive antenna switching time is to be less than 100ns, if each time slot all is in check independently words, this forward power control will can be not influenced on time slot changes to the direction between time slot.If a multiple time slot allocation is to control as single time slot, the ISCP of this multiple time slot and RSCP value are mixed and will must on average be used for all time slots to determine a compromise direction at branch.Otherwise the control of this forward (DL) power will attempt to compensate the change of this antenna direction.

1.1.9 AGC carries out the time

Idiopathic gain controlling (AGC) circuit that should be relevant with receiver amplifier 21 (Fig. 1) in the execution of a TDD is instantaneous compared to will be subject to relatively large power in a FDD carries out, and should be designed to handle them.Unexpected to the difference of time slot on power except normal time slot, this UE AGC will see extra phasic change on the reception signal of integrating with directive antenna.Because the gain difference between omnirange and directional pattern, and prior this directive antenna front is to the huge ratio of back, this UE AGC on input power, except this time slot to the variation of experience one omnidirectional antenna of time slot, may see the change of 6-8dB.As described above, this AGC that is used for TDD execution should be able to deacclimatize on signal strength by the caused extra variation of the integration of a directive antenna.

1.2 cochain (UL) guiding

This UL can be according to guiding in the received power of Node B maximum or at one group of measurement yardstick in order to the area interference that minimizes the caused vicinity of this UE.According to available excessive UE delivering power, this UL guiding calculation can be this both combination.Under the situation of this UE near maximum power output, this guiding should be according to maximize this received power in Node B.Yet, can provide under the situation of excessive power, this pointing direction should be that this minimizes this interference via the caused adjacent cell of UE.

Can relax interference between the sub-district of a contiguous base station by minimizing energy size that a UE is sent to an adjacent cell in the use of the directive antenna of UL.Two kinds of calculation methods can be used to point to this UL to minimize the interference between this sub-district.This first method is for measuring this UE in the transmission of all contiguous Node B and determine the direction of this maximization signal and the ratio of the area interference of being close to.Yet this needs this need coordinate not only between the node of this vicinity but also needs are coordinated between this Node B and this UE.Second preferable calculation method is described below, and it is to measure this and lose from forward path loss of contiguous base station and forward path and to infer this reverse link path loss according to the reciprocity between the loss of this cochain and following chain path.One pointing direction can be by decision with the power of the Node B that maximizes this desire and the link ratio to the power of contiguous Node B.If the search algorithm method between this frequency is to revise to adapt to this directive antenna, a lot of subsequently necessary calculating all have been available.Data of this calculation are to be available and no longer to need coordinator node B in this UE.

When the interference of the sub-district of the vicinity that minimizes this UL, will cause the loss of the Node B institute received power that links in desire sometimes.Being bordering on big path loss if this UE operates in, will be conclusive in any damage that Node B received to the performance of this UE.Under these circumstances, the UL of this UE with independent guiding on the power that is received to maximize the power of this UL in Node B.

1.2.1 the RX signal power measures

This UE measures the DL power on all pointing directions, supposes this reciprocity, and infers therefore how many received powers at this UL of Node B can be to be used for a specific direction.The RSCP of this P-CCPCH is measured to be used for the computing that this DL points on all pointing directions.At each pointing direction, this UE according to the measurement (passing through RSCP) of forward path loss on each pointing direction to calculate the estimation of a reverse link path loss to its Node B.

Measure 1.2.2 disturb between the sub-district

But during assigning idle time slot, this UE supposes this reciprocity, and infers how many received powers at this UL of Node B can be to be used for a specific pointing direction for the contiguous DL power of base station measurement on all pointing directions.During the possible transmission of interior frequency searching, the Node B that the RSCP of this P-CCPCH is necessary for this vicinity measures.In case this directive antenna is integrated, search frequently in this and must also list contiguous Node B in consideration at the RSCP of all orientation angle.Therefore, the data that should need measure in order to the interference of supporting between the molecule on UL can obtain from this search engine.At each contiguous Node B, this UE will calculate the loss in this reversible binding path on all available orientation angle.These data will be used to determine the pointing direction of this UL.

1.2.3 pointing direction

As described in Fig. 9, two pointing directions will be selected to be used for this UL.One direction will according to maximization this at the power that Node B received, and the ratio that the pointing direction that is used for UL will save by the interference of adjacent cell/section on all possible pointing direction of calculating UL signal that this desire links and this integration decides.This second selected UL is the power of this UL of intention maximization to the Node B of desire binding, and minimizes this interference to contiguous sub-district according to the measurement of propagating.Under the situation of direction difference, the delivering power that this UE estimated will be in order to this last direction of decision.If this UE delivering power approaches maximum to minimize the direction of this interference, final direction so subsequently will maximize this received power direction.

Because all estimations are the measurements according to this forward link P-CCPCH, will there be received power direction or the minimum interference radiating way of time slot to the correlation of time slot in maximum.Therefore, all cochain time slots had only a upper link direction.

One embodiment that is used for interference radiating way calculates and is shown in the 1st table.

The aerial angle of UL	Reverse link path loss estimation (dB)				Total interference power (dBm)	SNR
							The Node B that desire links	Contiguous Node B 1	Contiguous Node B 2	Contiguous Node B 3
	Left side pattern	133	138	140							145	-135.4	2.4
Omnidirectional mode					133	135	145	135	-131.8	-1.2
	Right pattern	138	140	142							138	-134.9	-3.1

In the 1st table, even left pattern and omnirange provide identical received power in Node B, left electric wave pattern will be selected because it provides the interference power of 3.5 less dB of contiguous Node B.That the chances are on interference power is identical for left and right electric wave pattern, yet right pattern will need the UL power (therefore bigger interference power) of more 5 dB in the Node B that desire links, so left pattern is preferable selection.

One more high-accuracy degree will be weighed the calculating that UL disturbs subsequently according to this in order to the load of monitoring Node B during interior frequency searching.For example, in the above-described embodiment, if left pattern is chosen as the covering omnidirectional mode, contiguous Node B 51-2 will see in interference that a 5dB increases.If this UE can determine that Node B 51-2 is to bear serious load by control between the P-CCPCH of Node B 51-2, this UE may can select omnidirectional mode to replace this left side pattern to be reduced in the disturbance load of Node B 51-2 so.

1.2.4 open power loop control

As also mentioned in Fig. 9, will estimate this oppositely (UL) path loss according to this forward (DL) path loss because open power loop control, so opening power loop control, this UL influenced by the integration of this directive antenna.This calculating hypothesis is the same in the antenna gain of cochain and following chain.Yet because this UL can be different with the DL pointing direction, gain not can occur on UL and DL.This forward (DL) path loss estimation must at this between the pointing direction that this paragraph 1.1.7. is indicated gain difference and adjust to some extent.Identical situation also is applicable to the computing interval that connects power at this reverse (UL).Must during the power calculation of the Node B that UL links to this desire, be compensated in the gain difference between omnidirectional mode and the directional mode.This gain difference can be calculated by being collected in this data during frequency searching.

1.3 the sensing of whole UL of system and DL changes

Because this Node B itself can be used a predecessor electric wave, so this UE appoints the speed of electric wave to change this UL and DL pointing direction before should being slower than Node B with one.Allow the change of this DL and UL direction refer in some time interval, take place perhaps can be good.If this Node B is used this predecessor's electric wave, this DL electric wave is to determine according to the data on UL.If the UL direction on UE is to change, this Node B may be adjusted its UL electric wave and adjust its DL electric wave subsequently according to this change.Should on UE, therefore may no longer have legitimacy to these new DL electric wave positions in order to the SIR number that calculates this DL by this forward power control.This SIR estimation that is used for that DL points to be between relative to each other be initiatively because they taken out by P-CCPCH in omnidirectional mode.The UE pointing direction of this UL is adjustable on any time point, uses former electric wave if this forward power control may need some times to go to adjust this Node B.If the UE direction of this DL changes, the control of this predecessor's electric wave also will need some times to adjust.In order to keep this forward power to control the decline of instantaneous number, advise that this change in UL and DL direction can take place periodically simultaneously and need be slower than this predecessor's electric wave upgrading the speed of upgrading with forward power control and changing with one.

1.4 the time is adjusted

The slot time adjustment that any basis is done at the path structure of this UE or Node B reception may be influenced by the integration of this directive antenna.This is because an omnidirectional directive antenna or directive antenna will be seen the incident path of building the UE receiver in an omnidirectional mode, but the higher relatively front of this directive antenna may be one by group's path structure generation that this UE received in conjunction with this directional mode (left side or the right) to the ratio of back.In addition, should may between this omnidirectional mode and a directional mode, change at the relative amplitude between this path.If suppose the reciprocity in path structure, so any change on pointing direction on the DL of UE also will influence the path structure of seeing in node B receiver.

2. obtain

During the selection of initial cell position, this UE calculates this RSCP that is used for the P-CCPCH of each Node B of detecting.By the integration of this directive antenna, this RSCP must be measured on all orientation angle.This preferable program is the initial detecting for execution subdistrict position under omnidirectional mode, and the quality of further inspecting each subdistrict position of being detected subsequently with the measurement on all orientation angle.Therefore this initial detecting is the detecting that is equivalent to a single omnidirectional antenna.Yet one group of extra step is to carry out to think that each sub-district of detecting determines the orientation angle that this is best after this initial detecting.Particularly, this a plurality of flats (that is to say and surpass several time slots) search engine that is used for that omnirange searches is to reach identical sensitivity on the project of the path loss of maximum through adjustment, is to be executed in directional mode if having as it that this follows.This considers the extra gain that is used for increasing coverage rate under directional mode.This final selection that is used for initially obtaining can according to this covering this highest RSCP, this maximized forward SIR of all angles of the sub-district of detecting cover institute all angles, reverse SIR that this maximization is estimated or total incompatible making of the above-mentioned three of the sub-district of detecting to some extent to some extent.SIR can be used for selecting this forward link direction and employed received power to determine this most initial reverse link pointing direction (supposing to have reciprocity), at a FDD system.This is a compromise direction, and it is to select according to this forward and reverse link direction.

And a TDD is carried out, the interested forward SIR of this institute keeps by this forward power control that is used for the distributed time slot time.Therefore because before CELL_FACH, can't be known, should will be the numerical value according to measurement or a ratio that RSCP measures between Node B of the P-CCPCHSIR of other Node B by the SIR that this search engine calculated.This use with the highest RSCP sub-district will minimize this path loss between this UE and this Node B, and this is being insignificant when this time chain and this cochain is found pleasure under being about near the situation of maximum power output (identical DL/UL direction) and seen very much.Under normal situation, when last connection and following connection all are considered to be together (identical DL/UL direction), select this to have the highest RSCP sub-district and will very likely can obtain the performance an of the best to other sub-district.Because the ratio of this RSCP is for being the same be used to guide the standard of this UL during stable state, use this direction to allow a possible former electric wave of UL during cell setting, to go to maintain identical direction, and minimize the impact of the sub-district of this vicinity in initial binding with this Node B.

This TDD initial cell obtains program and therefore can be described below:

A. select omnidirectional mode; As the executive mode of prior art to obtain a sub-district (detecting group)

B. calculate the RSCP that this is used for each sub-district of detecting for each directional mode (the left and right pattern of three-mode antenna)

C. set (omnirange, left and right) at each directivity and calculate this ratio between the sum total of the RSCP of the sub-district with maximum RSCP and other unit that detects

D. select this sub-district/position (group initiatively) with this maximum ratio

3. transmit

Ideally, reselecting of sub-district should be according to the identical standard of obtaining as initial cell.The measurement of the P-CCPCH RSCP of the Node B that each is detected should be used for calculating the pointing direction of this UL and DL with this maximized interference ratio of use.Yet because this transmission is according to the measurement of reporting the RSCP of this Node B by this UE, this Node B has a final control to the selection again of sub-district.In the measuring reports scheme of unmodified and the calculation that possible sub-district is reselected in the base station, they have two kinds of selections.

This first kind of selection is the RSCP on the P-CCPCH of the group that is collected in this monitoring on all possible pointing direction.The RSCP that this acquisition report is used in a lot of configurations measurements is for being used for the RSCP of monitor group group membership on its best re-pointing direction.This UE keeps the history of the pointing direction relevant with each group member, and if this base station commander one when being sent on the new sub-district, this UE uses this direction relevant with the new member of active group.The calculation of this base station that this also allows is to keep the influence that it is not subjected to this UE.Yet from the position that a mitigation is disturbed, the selected sub-district of the RSCP that this basis is the highest can not be best sub-district.

This second kind of selection is to be the RSCP on the P-CCPCH of the group that is collected in this monitoring, and calculates this best sub-district according to the ratio of this maximized signal and interference.When according to best cell/direction of the highest RSCP of best cell/direction of disturbing and this basis to some extent during difference, this RSCP reports that subsequently the measurement of this Node B is via value institute's deviation so that this Node B permission one comes the transmission of best cell of the position of self-interference.This only anyly can accomplish under the situation by the loss on such one base station of selecting to handle having an excessive delivering power as this UE.

The present invention is with reference to here special icon of preferred embodiment and explanation, mandatory declaration be those this area in form or different changes on the details, all can not depart from the target that claim of add of the present invention illustrates.

Claims (6)

1. set the method for a power level in the wireless telecommunication system that the directivity of a given antenna is set for one kind, this method comprises step:

Determine the gain adjustment factor that a directivity that is relevant to an antenna is set; And

Use this gain adjustment factor to control the power level of a transmission signal.

2. the method for claim 1, wherein this power control is to be a loop circuit power control.

3. method as claimed in claim 2, wherein this power control is for a cochain channel.

4. method as claimed in claim 2, wherein the control of this power is for chain channel once.

5. the method for claim 1, it comprises step extraly: use this gain adjustment factor to a path loss estimation.

6. the method for claim 1, it comprises step extraly: use this gain adjustment factor and set to reverse link power control.

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