WO2004028037A1 - Radio communication system - Google Patents

Radio communication system Download PDF

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Publication number
WO2004028037A1
WO2004028037A1 PCT/JP2002/009704 JP0209704W WO2004028037A1 WO 2004028037 A1 WO2004028037 A1 WO 2004028037A1 JP 0209704 W JP0209704 W JP 0209704W WO 2004028037 A1 WO2004028037 A1 WO 2004028037A1
Authority
WO
WIPO (PCT)
Prior art keywords
beam
signal power
base station
radio base
terminal station
Prior art date
Application number
PCT/JP2002/009704
Other languages
French (fr)
Japanese (ja)
Inventor
Kazunari Kihira
Yoshitaka Hara
Takashi Sekiguchi
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to PCT/JP2002/009704 priority Critical patent/WO2004028037A1/en
Priority claimed from JP2003136258A external-priority patent/JP4107494B2/en
Publication of WO2004028037A1 publication Critical patent/WO2004028037A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0602Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H04B7/0608Antenna selection according to transmission parameters
    • H04B7/061Antenna selection according to transmission parameters using feedback from receiving side
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695Hybrid systems, i.e. switching and simultaneous transmission using beam selection

Abstract

A radio communication system comprising a radio base station for forming beams having a plurality of different directivities and a plurality of terminal stations for performing communication with the radio base station. Each terminal station comprises a means for estimating the ratio of the desired signal power to the interference signal power of an downstream line transmitted from a plurality of beams of the radio base station, a beam selecting means for selecting the optimum beam from the ratio of the desired signal power to the interference signal power, and a means for informing the selected beam number by using an upstream line from the terminal station to the radio base station. The radio base station comprises a transmission control means for transmitting information signals to the terminal station by using the beam corresponding to the beam number if there is the beam number informed from the terminal station.

Description

Akira fine manual wireless communication system

TECHNICAL FIELD The present invention relates to a radio communication between the radio base station and a terminal station to be used for mobile communication or the like, while particularly following the variation in the propagation path characteristics, to reduce interference, achieving good information transmission efficiency a wireless communication system capable of. BACKGROUND

In recent years, PDC (Personal Digital Cellular) and PHS (Personai Handy-phone

Wireless communication systems around the mobile phone System) or the like, its convenience is observed, are popular in remarkable pace. On the other hand, with the increase of users, problems such as shortage and deterioration of the communication quality of the used frequency has arisen. Especially reflections around the structure, the occurrence of multi-path fading due to scattering is a wireless communication inherent problem is a major factor of the communication quality deterioration. Conventionally, as a countermeasure, in the radio base station, by a sector construction of arranging the plurality of directional antennas having directivity that different method, such as most sequentially selecting a good antenna reception state is taken to have.

Further, as a method to measure even higher functionality, the position and the multiple terminal stations unevenly distributed within the service area, depending on the direction of arrival of signals transmitted from the terminal station, a plurality of spatially orthogonal to each other forming a beam, it is mentioned to allocate for the reception of signals from each terminal station.

Specifically, different from the terminal station that wishes to communicate, there is § Dapu Restorative array antenna to actively remove the signals from interfering with Do that terminal station that exists in any direction (interfering station). § Dapu Restorative array antenna, the amplitude of these received signals by using a plurality of antenna elements, and adjusting the phase, which is a signal processing system that suppresses an interference signal at the output by synthesizing. That is, in an environment where the interference signal which affects the communication quality is present, toward the beam arrival direction of the signal to be desired, for the arrival direction of the interference signal operates to form a null directionality . Adjusting the received signal amplitude and phase are equivalent to output signals from the respective antenna elements #. 1 to # N as shown in FIG. 1 4 to complex weighting.

When downlink (base station transmitting, mobile station receiving) (method using the same frequency by dividing time sending and receiving) For TDD (Time Division Duplex) scheme is channel characteristics of the transmission received is because it regarded the same in the short-term variation, in the case of sector configuration that also utilized in downlink a selected antenna in the uplink (base station receiver, the terminal station transmits) in the case of using the Adaputipuare one antenna by directing the null of the directivity in the interfering station direction, it is suboptimal control.

On the other hand, frequency is different in the uplink and downlink FDD (Frequency Division

For Duplex) scheme, different channel characteristics of the transmission and reception may not satisfactory characteristics were obtained in the above method of determining the transmission method of the downlink from the received signal of the uplink. Therefore, the information of the propagation path characteristics of the downlink measured by the terminal station, to extract the information required for controlling the transmission beam Te base station smell. By inserting the information to transmit signals of the uplink, there is Fi one Dobakku type control method for notifying the radio base station. In this case, regardless of the difference in frequency of transmission and reception, always as the reception state of the terminal station is good, it becomes possible to control the beam used for transmitting the radio base station side, improvement in communication quality can be expected. ,

For example, in the conventional antenna selection type control scheme, as shown in FIG. 1 5, the Pairodzuto symbols of each beam to the information bits of the downlink (assuming N beams in the figure) and 揷入 each slot Send. The N-number of pilot symbol sequence transmitted from each beam is detected by the terminal station, to measure it that of the received power, most large beam number of the received power by notifying in uplink, the following and have you to slot, the radio base station transmits the information symbol using the selected beam.

In the case of applying the § Dapu Restorative array antenna, as the information to be broadcast in the uplink, and channel transfer coefficient for each antenna element of the radio base station, when estimating the-wait for hand transmitted to the terminal station , such a weight factor for each antenna element o

Thus, estimating the parameters Isseki involved in propagation path characteristics in the terminal station, by utilizing the above Ri line by notifying the radio base station, even in systems where the frequency of the uplink and downlink are different, the channel beam control following the fluctuation of the characteristic is possible. However, in the conventional beam selective control method, The more the number of beams as shown in FIG. 1 5, increased the proportion of pilot symbols for the information symbol in the entire slot, as a result, information transmission efficiency in downlink degradation filed the problem of the mounting

On the other hand, when a § Dapu Restorative array antenna, channel transfer coefficient or weighting factor for informing the terminal station is a complex number consisting of amplitude and phase information, feedback the coefficients for the number of antenna elements in the uplink to further since it is necessary to, the amount of information increases. For example, the number of bits k in per one weight factor, bi - when the number of beam is n, the amount of information to be fed back also becomes k * n Bidzuto. Must be inserted into information symbols of the uplink the control signal for example, every one slot, because that increases the percentage of control symbols inserted into the information symbols uplink information transmission efficiency of uplink significantly lowered there is a possibility.

Further, in the technique ideally operation of forming a null for interfering station direction, extremely it is an effective way, when considering an actual operation, control delay due to processing delay Ya off Eid back at a terminal station significantly influence such as interference suppression pressure effect may not be obtained sufficiently against the complexity of the process.

An object of the present invention is to solve the above problems, yet robust i.e. adaptable to environmental changes, while maintaining the information transmission efficiency, provide improved communication quality, there is provided a wireless communication system.

Disclosure of the Invention

The present invention includes a radio base station forming a beam having a plurality of different orientation, in a wireless communication system comprising a plurality of terminal stations for communicating with this radio base station, the previous SL each terminal station, the radio base means for the desired signal power to interference signal power ratio of the downlink transmitted from a plurality of beams which it estimates stations, a beam selection means for selecting an optimum beam from the desired signal power to interference signal power ratio , and means for notifying with an uplink of said selected bi one beam number from the terminal station to the radio base station, the radio base station, the beam number which is notified from the terminal station there if in a wireless communication system characterized by comprising a transmission control means for transmitting the information signal to said terminal station using a beam corresponding to the beam number.

Further, the radio base station, beamforming to arbitrarily set the beam shape depending on the environment in which the array antenna composed of a plurality of antenna elements for forming a plurality of beams, the radio base station is installed characterized by comprising a means. The transmission control unit of the radio base station, the information signal that is sent to the terminal station from the radio base station, the different known signals for each of a plurality of beams formed by the radio base station is added to multiplexed a desired signal power to interference signal power ratio estimation means of the terminal station detects a pre-Symbol known signals, you and estimates the desired signal power to interference signal power ratio.

Further, characterized by using the data symbols which are orthogonal to each other as the known signal.

The wireless communication system to communicate CD MA communication system, the transmission control unit of the radio base station, it is then spread processing by the orthogonal codes the known signal, a spreading process and known signals for each beam those multiplexed and added to the information signal transmitted to the terminal station, the desired signal power to interference signal power ratio estimation means of the terminal station detects a known signal the spreading process, the desired signal power to interference signal power ratio, wherein the estimated child.

Further, the desired signal power to interference signal power ratio estimation means of the terminal station, a feature that estimates the desired signal power to interference signal power ratio detecting the known signal after the RAKE combining.

Further, the desired signal power to interference signal power ratio estimation means of the terminal station, the desired signal power by detecting the known signal included in the largest path received power in the desired signal group received by the terminal station and estimating the to-interference signal power ratio.

The beam selecting means of the terminal station, the desired signal power to interference signal power ratio is selected larger beam than the threshold value set Te to base, the transmission control unit of the radio base station using these beam information and transmitting the signal.

Further, the desired signal power to interference signal power ratio estimation means of the terminal station, a beam selection means, notifying means, and the transmission control unit of the radio base station, in the initial state of the communication start, the beam number using the total beam after determining the is characterized in that said using a beam adjacent to the bi one arm and its corresponding beam number, estimates the desired signal power to interference signal power ratio of the downlink, and updates the sequential selection beams It shall be the

Further, the desired signal power to interference signal power ratio estimation means of the terminal station, a beam selection means, notifying means, and the transmission control unit of the radio base station, in the initial state of the communication start, with all the beams in said terminal station Te estimating the desired signal power to interference signal power ratio of the downlink, information good angular range of the received state notification using the uplink to the wireless base station, then the the radio base station is selected by using the plurality of beams formed in the range, it estimates the desired signal power to interference signal power ratio of the downlink, and updates the sequential selection beams.

Also, periodically estimate the desired signal power to interference signal power ratio in the downlink by using all the beams, and updates the information of good angular range of reception.

Further, based on the broadcast range of angles from the terminal station, by utilizing the maximum limit allowed freedom, characterized by re-forming a plurality of beams within its scope.

Also, an array antenna to form a beam having a plurality of different orientation, plural and arranged at a distance to the extent that correlation characteristic of propagation path can be sufficiently neglected, select the beam used for sending it on it, transmits it is characterized in.

Also, an array antenna to form a beam having a plurality of different orientation, the correlation characteristics of the propagation path plurality placed at a distance of a degree can be sufficiently neglected, and selecting an optimum beam in the entire beam , and transmits. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 shows to proc diagram a configuration of a radio base station of a wireless communication system according to an embodiment of the present invention,

2 Bed-locking diagram showing the configuration of a terminal station of a wireless communication system according to an embodiment of the present invention,

Figure 3 is a diagram showing an example of a signal full Omatsu Bok transmission slot in the radio base station according to an embodiment of the present invention,

Figure 4 is a diagram showing an example of a specific configuration of each beam SIR estimator of Figure 2,

5 proc diagram showing a configuration of a radio base Chikyoku wireless communication system according to the present invention having a plurality of array antennas,

Figure 6 is proc diagram showing a configuration of a radio base station of a wireless communication system according to another embodiment of the present invention,

Figure 7 is a diagram showing an example of a specific configuration of the beam forming circuit of FIG. 6,

Figure 8 is a diagram showing an example of a specific configuration of each beam SIR estimation unit of the terminal station in the CDMA communication system of the present invention,

Figure 9 shows another example of a specific configuration of each beam SIR estimation unit of the terminal station in the CDMA communication system of the present invention,

Figure 1 0 is a diagram showing an example of signal Fomatsuto transmission slot in the radio base station according to another embodiment of the present invention,

Figure 1 1 is a diagram for illustrating a method for forming a transmission beam in the radio base station according to another embodiment of the present invention,

1 2 further views for explaining a method for forming a transmission beam in the radio base station according to another embodiment of the present invention,

Figure 1 3 is further views for explaining a method for forming a transmission beam in the radio base station according to another embodiment of the present invention,

Figure for Figure 1 4 is illustrating a conventional radio communication system,

Figure 1 5 is a view for explaining 揷入 of beam selection pilot symbols in the conventional antenna selection type control scheme. BEST MODE FOR CARRYING OUT THE INVENTION

The first embodiment.

It will be described with reference to FIG attached to a wireless communication system and a radio base station and a terminal station according to an embodiment of the present invention. 1 and 2 is a block diagram showing an example of it it the radio base station, the terminal station, the configuration of the wireless communication system according to an embodiment of the present invention, FIG. 3 is transmitted in a radio base station of the present invention an example of a signal Fomatsuto the slot Bok shown - is to FIG.

The radio base station of FIG. 1, a plurality of antenna elements having a directivity in different directions (# 1~ #N) 101~: 103 and a duplexer 104 to 106, a transmitter (Tx) 107 - 109, receiver (Rx) and 110-112, a receiving beam control circuit 113, a demodulator 114, a beam number detector 115, a modulator 116, a pilot symbol generator 117, and a beam switching circuit 118.

Terminal station of Figure 2, the antenna element 141, a duplexer 142, a receiver (Rx) 143, a transmitter (Tx) 144, and each beam SIR estimator 145, from the beam selecting circuit 146 and the modulator 147 constructed.

Illustrating the operation of the wireless communication system according to an embodiment of the present invention. At the end the end station shown in FIG. 2, the signal received by the antenna 141 is input to the receiver (Rx) 143 via a duplexer 142. Receiver 143: reception signal RF (Radio Frequency) band base - into a digital signal of baseband. Each beam SIR estimator 145 detects a later described to multiplexed by being inserted each beam of the pilot symbols at the beginning of each slot as shown in FIG. 3 (a known signal), it it desired signal power to interference signal power ratio (SIR: signal-to-interference ratio) estimate the.

An example of a specific configuration of each beam SIR estimator 145, include configuration shown in FIG. 4, Roh W Lot symbol generator 151, a correlator (1~N) 152~: 154, evening Imingu detection vessel (1~N) 155~157, SIR calculator (1~N) 158~: made of 160.

Pilot symbol generator 151 generates the same pilot symbols for each beam and that Type 揷 the transmission Surodzu preparative in the radio base station. Correlator 152 to: In 154 performs correlated arithmetic between the output signal from the receiver 143 and these pyro Uz preparative symbol, extracts the desired signal component. Thereafter, timing detector 155~: 157 to have the availability service timing between pilot symbols included in the received signal best matches sample, after ie most SIR detects the timing of the sample being improved, detected timing of using samples, it derives the SIR of each beam in the SIR calculator 158 to 160. SIR value of each of these beams are input to the subsequent beam selection circuit 146.

In the operation in the SIR calculator 158-160, by performing averaging processing using a plurality of samples, it is possible to estimate the good value accuracy.

In beam selection circuit 146 selects the highest SIR is high beams. This although to inform the radio base station in the uplink, the procedure inserts the information of the selected beam number information symbols to be transmitted, after facilities modulation processing in the modulator 147, a transmitter (Tx ) 144 is converted into a band signal of the RF band by, via the duplexer 142 and radiated from the antenna 141.

Thus, the information fed back from the terminal station since it is only the beam number, little effect on the transmission efficiency of the uplink. For example, when using eight beams may if 3 bits as control information. Moreover, it is not necessary to consider them in the end the end station be used whatever the shape of the beam in the radio base station since it is the form that notifies beam number, and scalable system. Incidentally, One signal components including various information data such as voice to be transmitted from the radio base station information, although being detected due demodulator, to simplify the explanation in the configuration example of FIG. 2 of the present invention that omits the portion for clarity more features.

On the other hand, the radio base station of FIG. 1, New number of antenna elements having a directivity that it it different modulated signals transmitted from the terminal station 101 to: receive at 103, the Du plexer 104 to 106 it through it, a receiver (Rx) 110 to; detects at 112, into a digital signal of the base one baseband the signal in the RF band.

Antenna element group 101 through 103 are those with it it is different directivity, and is set in accordance with the communication range of the non-linear base station. For example, when the cover one entire circumference of 360 degrees at eight antenna elements, the beam width of each antenna element as 45 degrees extent, may be evenly spaced.

The reception beam control circuit 113, the amplitude of the received signal of each antenna element, synthesized by the adjustment phase to obtain an output signal. At this time, the control hand stage of the reception beam control circuit 113 is utilized various existing algorithms, § Da Petit poor Leer to form a null for diversity one cytidine synthesis techniques and interference signals, such as for example selective combining, maximum ratio combining various control algorithms antenna and the like.

The output signal after array combining is demodulated by the demodulator 114, the beam number detector 115 detects the information of the selected beam number included in the received data. Note that in FIG. 1 for clarity further features of the invention is to simplify the explanation is omitted for the process of determining the information symbol from Isseki reception de obtained from the demodulation unit 114.

The operation of the transmission will be described. The pilot symbols of a specified length in a pilot symbol generator 117, the number of beams forming is generated, the beam number detected by the information symbols obtained by modulating by a modulator 116 beam number detector 115 together with the information, and inputs the beam switching circuit 118.

The beam switching circuit 118, generates a transmission Surodzu bets Fomatsuto as shown in FIG. That is, the beam corresponding to the detected beam number at beam number detector 115 (FIG. 3 example in which Beam2 is selected) adds backward information symbols pilot symbols. For other beam, anything 揷入 null symbols like all or not added zero value. By performing multiplexing to transmit transmission Surodzu bets of each beam (in this case N) of simultaneously reducing the proportion of Pairodzu Toshinboru in the slot, it is possible to prevent a decrease in transmission efficiency.

In the embodiment of the present invention, since the pilot symbols of each beam is configured to be transmitted by multiplexing on the same time, if you consider the accuracy of SIR estimation in the terminal station, the correlation characteristics of each pilot symbol as small as possible it is desirable to set to be perpendicular to each pie. lot symbols.

For example, CDMA: In (Code Division Multiple Access Code Division Multiple Access) communication scheme, but the communication in the same time by performing the identification of the user by the spreading code is to the possible, to extend it, by performing the diffusion process by assigning it its being orthogonal spreading code pilot symbols of each beam, the present invention becomes applicable to CDMA systems, efficient transmission schemes can be realized.

Thereafter, the transmitter (Tx) 107 to 109, are converted into band signals in the RF band and radiated by the antenna elements 101 to 103 through the du plexer 104-106.

In this way, by a plurality of bi one beam forming in a radio base station, a signal orthogonal to each other from each transmit multiplexed, it notifies to choose a good beam of best reception state in the terminal station, an uplink and also in the downlink frequency used in the line have different wireless communications systems, it holds information transmission efficiency, following a child becomes possible variation in the propagation path characteristics.

Moreover, § Les first antenna 10a formed of the antenna elements 101 to 103 in the wireless base station as shown in FIG. 5, is installed a plurality of 10b-, as it interval enough to propagation path characteristics is Muso function together it, in it facilities Succoth it of the control in the array antenna, it is also possible to obtain a diversity one cytidine effect. Then select the beam used for transmitting a beam with a plurality of these different orientation § les first antenna 10a, 101) · · · it it to be formed, may be transmitted, or the entire (total and selecting an optimum beam in) the beam (highest SIR), or may be by sending Unishi. Incidentally, 104 to the Figure 1: control portion consisting 118 be provided individually to each array antenna, or commonly can be connected to a switched pair provided.

The second embodiment.

It will now be described a radio base station according to another embodiment of the present invention. 6 is a proc diagram showing a configuration of a radio base station according to another embodiment of the present invention. The radio base station of FIG. 6 is intended to form the respective beams at daisy Yuru signal processing, a plurality of antenna elements which have a nondirectional (# 1~ # N) 121~: 123 and duplexer 124 to: 126 When a transmit device (Tx) 127 to 129, a receiver (Rx) 130 to: 132, a reception beam control circuit 133, a demodulator 134, a beam number detector 135, a modulator 136, a pilot symbol a generator 137, a beam switching circuit 138, consisting of a beam forming circuit 139 for forming a plurality of beams by Digi Yuru signal processing.

To describe the specific operation, in part essentially non antenna elements (# 1 ~ # N) 121~123 and the beam-shaped forming circuit 139 corresponding indicated to it that Figure 1 so the description same der Ru omitted.

Antenna elements 121 to 123 has no directivity in a particular direction, respectively consisting of any of the N, and a so-called omni-directional antenna elements.

Subsequent operation is the same processing and the radio base station of FIG 1 is made, after creating a transmission Surodzuto of each beam by the beam switching circuitry 138, the beam forming circuit 139 Nitede I di Yuru signal processing beam is formed having a plurality of directional directions by the antenna elements 121 to: transmitted at 123.

Figure 7 shows an example of a specific configuration of the beam forming circuit 139. Bi one beam forming circuit 7, the distributor (1~L) 171~: 173, consists of the weighting factor adder 174 and the synthesizer (1 ~ N) 175~177 gives a weighting factor. Although Figure 7 is the number of beams to form indicates the L number of examples, the number of beams L need not be the same as the number of antenna elements N. Transmission Surodzuto of each beam generated by the beam switching circuit 138 of FIG. 6, the distributor 171 to 173, are N dispensed.

Each slot is dispensed, the weighting coefficient of the complex number Wii (i = l, ..., N; j = l, ..., L) after being adjusted amplitude, the phase component by R74, synthesizer (1 Ν) 175~Γ77 synthesized by, it is multiplexed.

That, wij~w N j corresponds to the weighting factor of the array antenna for beam j, by such a weighting coefficient L sets prepared performs beamforming in daisy evening Le stage.

Also, these processes are not only realized by Haiti Douwea as shown in FIG. 7 can be realized by software Touea. Therefore, DFT (Discrete Fourier

That it uses an orthogonal multibeam according Transform) and FFT (Fast Fourier Transform) is facilitated.

This way daisy Yuru signal processing, by performing the formation i.e. setting beam shape each beam, depending on the installation environment of the base station, and depending on environmental changes, and can be re-formation of freely beam Become.

Embodiment 3.

Each beam SIR estimation unit of the terminal station according to the present invention in a CDMA communication system of an example of a configuration of (145 see FIG. 2) shown in FIG. 8. Each beam SIR estimator 145a of FIG. 8, the diffusion code generator 181, MF (Matched Filter: matching Fill evening) (1~N) 182~: 184 with each path timing detector (1 to N) 185 ~: 187, and RAKE (1 to N) synthesizer 188-190, SIR calculator (1 to N) 191 to: made of 193.

A spread code generator 181, MF (Matched Filter: matching Phil evening) 182~: 184, and the path timing detector 185 through 187, SIR calculator 191-193 is pi port Ttoshinboru generator 151 shown in FIG. 4 , the correlator 152 to 154, evening timing detector 155~: 157, SIR calculation unit 158~: run 160 similar operation.

In CDMA communication system, and transmits the spread over a wide band of the signal with spreading codes of higher data rates than the information symbol. On the receiver side, to reproduce original information symbols by the correlation detection performed (referred to despreading processing) using the same spreading code as the spreading code used on the transmission side. In this case, as the cross-correlation properties of the spreading codes assigned to each user is smaller, a large interference suppression effect in the despreading process.

In a wireless communication system according to an embodiment of the present invention utilize, this characteristic beam selection process in the terminal station. It will be described in detail below.

As mentioned in the first embodiment, when the transmission slot diffused a path for the pilot symbols using spreading codes orthogonal to each beam received by the terminal station, the spreading code generator 181 shown in FIG. 8 is a wireless base It generates the same spreading code as that used in the station, MF182~: inputs to 184. MF182~: In 184, after performing correlation detection processing of the received signal and the spread code (despreading), each path timing detector 185 to: 187 Oite, the desired signal arriving through various propagation paths to detect the delay timing of each path of. In RAKE combiner 188-190, based on each path timing, each path components subjected to RAKE synthesis for synthesizing the maximum ratio, in SIR arithmetic unit 191-193 uses its combined output, the SIR value of each beam presume.

By thus assigning a spreading code orthogonal to each beam, high have interference suppression effect is obtained when the correlation detection by estimating the SIR of each beam further using the signals after RAKE combining, and most more accurate selection of efficient beam becomes possible.

Embodiment 4.

An example of a configuration of each beam SIR estimation unit of the terminal station according to another embodiment of the present invention in a CDMA communication system shown in FIG. Each beam SIR estimator 145b of FIG. 9, the diffusion code generator 201, MF: and (Matched Filter matching fill evening) (1 to N) 202 to 204, the maximum path timing detector (1 to N) 205 ~ and 207, a SIR calculator (1~N) 208 ~ 210 or al.

A spread code generator 201, and MF202~204, SIR calculator 208 to 210 includes a spread code generator 181 in the third embodiment, MF182~: the 184, SIR calculation section 191 to: 193 and have the same operation since the description thereof is omitted. In the maximum path timing detector 205 to 207, in each path of the desired signal arriving through various propagation paths, and most reception level to detect the timing of the high pass. Then, based on the sampling timing of the maximum path detected in SIR calculator 208 to 210 estimates the SIR value of each beam.

In the structure for detecting only path maximum reception level in this way, can simplify the timing detector, it is possible to reduce the RAKE combiner, thus simplifying the apparatus configuration of the terminal station.

Embodiment 5.

In the above embodiment, although not as SIR at the terminal station selects the best beam, the propagation path characteristic is to Runado to multipath arriving from a distant angle, high SIR beam there is a possibility that there are a plurality. For beam selection method in such a case it will be described.

In the terminal station sets the target SIR in advance as a threshold value. It estimates the SIR of each beam using a pie opening Ttoshinboru in transmission Surodzuto from the radio base station, selects a plurality of beams having a value greater than the previous target SIR. Each was these selected bi - informs the beam number to the radio base station by an uplink, and transmits the information symbol by using a plurality of beams in the radio base station.

Figure 1 0 shows a transmission slot structure of a radio base station according to the present embodiment. Performing multiplexing to send these N transmission slots of each beam at the same time. In Figure 1 0 is the N beams, that the J beam are examples of when it is selected by the terminal station, which adds a transmission slot it it to information symbols of the selected beam, multiplexes in, it is possible to use a beam of good condition of the propagation path characteristics efficiently. Embodiment 6.

It will be described the method for forming the transmission beam in the radio base station according to the present embodiment. Figure 1 1 shows an example of a case of forming the beam at regular intervals in a horizontal plane. Bicycloalkyl one beam 221 that is selected is a beam selected by the terminal station, is used to transmit information symbols at the next slot in the radio base station. Adjacent beams 222, 223 is a beam adjacent thereto.

Contact Itewa system that feeds back some control information to the radio base station from the terminal station, the amount of information, the information transmission efficiency of the uplink is affected. Me other, it is desirable that as small as possible control information. This embodiment shows how to achieve it.

It will be described specific operation. In the initial state of the communication, it transmits a pilot Toshinboru using all the beams, beam number information selected by the terminal station, and is notified to radio base station by an uplink. The radio base station as described in the previous embodiment, to detect the selected beam number to create a transmission slot. In this case, instead of creating a transmission slot using all the beams, to create a slot using the beam 221 and the selected, the adjacent beam 222 adjacent to Re their, 223 only. And to update the Exiled following selection to beam.

In this way, addition of reducing the amount of processing in the radio base station, it becomes possible to reduce control information symbol number to be inserted to bi Ichimu selection processing and uplink at the terminal station. Although FIG. 1 1 is an example of a horizontal plane, to form a beam in the vertical plane, such as by use of adjacent beams around the selected beam 221, corresponding to the beam configuration of each radio base station it can.

Moreover, by determining the selected beam using regular full beam, it is possible to follow the change in the more good accuracy rather propagation path characteristic.

Embodiment 7.

It is described method of forming another transmission beam in the radio base station according to the present embodiment. Figure 1 2 shows an example of a case of forming the beam at regular intervals in a horizontal plane. Select beam group 225 is a set of beams selected by the terminal station in the initial state.

In the initial state of the communication, it transmits a pyro Uz bets symbols ones are placed over arm as described in the first embodiment is a radio base station. In the terminal station estimates the SIR of each beam, to specify the selected beams 255 from good angular range of SIR. At this time, the beam number included in the selected beam group 255 shall be designated in advance.

The range setting of the beam group, such as one beam Zu' method and continuous method of setting to slide and the like.

The radio base stations broadcast information of the selected beams by the uplink using the beam in the selected beam group 225 transmits a pie port. Ttoshinboru, is renewed sequentially beam selection process.

Further, by performing the reconfiguration of the beam group to be used as regular above, it is possible to follow the change in channel characteristics.

Embodiment 8.

It is described method of forming another transmission beam in the radio base station according to the present embodiment. Figure 1 3 shows an example of a case of forming the beam at regular intervals in a horizontal plane. Oite a 1 3 Initially, b denotes a beam group at the start of communication. Selective beam group 230 is a set of beams selected by the terminal station in the initial state. Setting method of selecting the beam group 230 is similar to that explained in Example 7.

The radio base station, an angular range of selected beams 230 notified from the terminal station, using the maximum freedom to be allowed, the beam is densely reformed. Communication after starting using the beams 231 These reshaped transmits information symbols.

By thus densely arranged beams good angular range of SIR, it can accurately follow the variation in the propagation path characteristics.

Further, by performing the reconfiguration of the beam group to be used as regular above, it is possible to follow the change in channel characteristics. Industrial Applicability

Wireless communication system of the present invention, hold such a robust i.e. adaptable to environmental changes, while maintaining the information transmission efficiency, useful as those provide improved communication quality Oh o

Claims

The scope of the claims
1. A radio base station forming a beam having a plurality of different orientation, in a wireless communication system comprising a plurality of terminal stations for communicating with the radio base station,
刖 s3 each ¾ Not stations,
Means for it it estimates the desired signal power to interference signal power ratio of the plurality of downlink transmitted from the beam of the radio base station,
A beam selecting means to select the optimal beam from the desired signal power to interference signal power ratio,
And means for notifying with an uplink of the selected beam number from the terminal station to the radio base station,
Equipped with a,
The radio base station,
A transmission control means for transmitting an information signal to said terminal station using bi chromatography beam corresponding to the beam number when the beam number which is notified from the terminal station,
Wireless communication system comprising the.
2. The radio base station arbitrarily sets the its beam shape depending on the environment in which the more configured array antenna to a plurality of antenna elements for forming a plurality of beams, the radio base station is installed wireless communication system billed ranging preceding claim, characterized in that it comprises a beam forming means.
3. The transmission control unit of the radio base station, the information signal is transmitted to the terminal station from the radio base station, the different known signals for each of a plurality of beams formed by the radio base station is added to multiplexed, desired signal power to interference signal power ratio estimation means of the terminal station, the known signal is detected and the desired signal power to interference signal wireless communication system ranging first claim of claim, characterized in that to estimate the power ratio .
4. The wireless communication system ranging first claim of claim which comprises using the data symbols which are orthogonal to each other as a known signal.
5. A wireless communication system to communicate CD MA communication system, the transmit control unit of the radio base station, it is then spread processing by the orthogonal codes the known signal, spreading processing and known signals for each beam the ones obtained by multiplexing added to the information signal transmitted to the terminal station, the desired signal power to interference signal power ratio estimation means of the terminal station detects the diffusion process and known signals, the desired signal power wireless communication systems ranging first claim of claim, characterized in that estimating the to-interference signal power ratio.
6. The desired signal power to interference signal power ratio estimation means of the terminal station, the scope of the claims that the known signal is detected and the and estimates a desired signal power to interference signal power ratio first RAKE-combined wireless communication system of claim wherein.
7. The desired signal power to interference signal power ratio estimation means of the terminal station, the desired signal the known signal is detected and the included the largest path received power in the desired signal group to be received by the terminal station wireless communication systems ranging first claim of claim, wherein estimating the power to interference signal power ratio.
8. Beam selection means of the terminal station, the desired signal power to interference signal power ratio is selected larger beam than setting boss was threshold Te to base, the transmission control unit of the radio base station by using these beams wireless communication systems ranging first claim of claim, characterized in that for transmitting the information signal.
9. The desired signal power to interference signal power ratio estimation means of the terminal station, a beam selection means, notifying means, and the transmission control unit of the radio base station, in the initial state of the communication start, the beam number using the total beam after determining the uses the beam number corresponding to the beam and the beam adjacent thereto, estimates the desired signal power to interference signal power ratio of the downlink, to and updates the sequential selection beams billing the wireless communication system ranging first claim of that.
1 0. Desired signal power to interference signal power ratio estimation means of the terminal station, a beam selection means, in the transmission control means of the notification unit, and the radio base station, in the initial state of the communication start, the whole beam at said terminal station It used to estimate the desired signal power to interference signal power ratio of the downlink, information good angular range of the received state notification using the uplink to the wireless base station, then selecting in the radio base station using a plurality of beams ranges formed, which is to estimate the desired signal power to interference signal power ratio in the downlink, claims and updates a sequential selection beams scope of claim 1 wherein wireless communication system.
1 1. Regularly full beam estimating the desired signal power to interference signal power ratio in the downlink by using the first 0 wherein the claims and updates the information of good angular range of reception conditions the wireless communication system according.
1 2. Based on the notification range of angles from the terminal station, by utilizing the maximum limit allowed freedom, range 囲第 1 0 claims, characterized in that re-forming a plurality of beams within its scope wireless communication system of claim wherein.
1 3. The array antenna to form a beam having a plurality of different orientation, plural and arranged at a distance to the extent that correlation characteristic of propagation path can be sufficiently neglected, select the beam used for sending it on it, transmits wireless communication systems ranging first claim of claim, characterized in that the.
PCT/JP2002/009704 2002-09-20 2002-09-20 Radio communication system WO2004028037A1 (en)

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