JP3411150B2 - CDMA cellular radio communication device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CDMA wireless transmitter, a wireless receiver and a wireless transmitter used for digital cellular mobile communication and the like, and more particularly to FD.
Both of the D (frequency division duplex) and TDD (time division duplex) systems can be operated with a simplified configuration.

[0002]

2. Description of the Related Art In digital cellular mobile communication, a multiple access system is employed in which a plurality of mobile stations simultaneously connect to a line using the same frequency band. CDMA (Code Division Multiple Acc) which is one of the multiple access methods
ess, code division multiple access) is a technique for performing multiple access by spread spectrum communication in which the spectrum of an information signal is spread and transmitted in a band sufficiently wider than the original information bandwidth. Therefore, CDMA may be referred to as spread spectrum multiple access (SSMA). As a method of spread spectrum, a direct spread method, that is, a method of multiplying an information signal with a spread sequence code as it is to spread it is adopted.

In wireless transmission, transmission and reception are performed separately for each radio frequency (FDD method), and transmission and reception are performed by time division using the same frequency (TDD).
DD method). As shown in FIG. 9, FDD (Freq
In the uency Division Duplex, the radio frequency F1 (801) used for the downlink (base station → mobile station) and the frequency F2 (802) used for the uplink (mobile station → base station) are different.
On the other hand, TDD (Time Division Duplex) is also called a ping-pong method and performs communication by time division of the same radio frequency F3 (803) into transmission / reception.

FPLMTS (Future Pablic Land) is being standardized as a next-generation mobile communication centering around ITU.
Mobile Telecommunication Systems), FPLM
As shown in FIG. 10, 1885 to 2025 MHz and 2110 to 2200 MHz are assigned as radio frequencies used in the TS band. For example, when the above two frequency bands are divided into the FDD band and the TDD band, the FDD band has a frequency of 2110 to 2200 MHz and a frequency of 1885 to 1975 MHz of 90 M each.
Allocating Hz to the remaining low frequency band 1975-2025MHz
It is conceivable to allocate 50 MHz of the above to the TDD band. In this case, the cellular radio system is F
It is conceivable to operate two communication systems of DD and TDD in the same area and the same base station.

Therefore, in the present invention, a CDMA cellular radio communication apparatus capable of supporting both the FDD and TDD systems will be examined.

First, the detection method adopted by this wireless communication apparatus will be described.

There are synchronous detection methods and differential detection methods as the detection methods in digital communication. The synchronous detection methods are
It has better static characteristics than the differential detection method, and has the lowest E _b / I ₀ required to obtain a certain average bit error rate (BER).

Further, as a detection method for compensating for distortion of a transmission signal due to fading, an interpolating type synchronous detection method has been proposed (Masaichi Mitsukage, "16QAM Fading Distortion Compensation Method for Land Mobile Communication", B. -2 Vol.J72-B-2
No.1 pp.7-15,1989). In this method, pilot symbols are periodically inserted in the information symbols to be transmitted,
The transfer function of the channel (that is, the state of the line) is estimated and detection is performed. Also, a method has been proposed in which the above method is applied to direct spread CDMA (Higashi, Taguchi, Ohno “DS / C
Characteristics of Interpolative Coherent Detection RAKE in DMA "Technical Report RCS94-98, 1994). Fig. 11 is an example of a channel format in which pilot symbols 1001 for coherent detection are interpolated. The pilot symbol is interpolated at (1002).

Further, as a method for enabling synchronous detection in direct spread CDMA, there is a method using a pilot channel. This is a method in which one channel (spreading code) is used as a detection reference signal and is always transmitted independently of a channel for transmitting information data. FIG. 12 shows an example of a channel format in which pilot channels are multiplexed. In this figure, in addition to pilot channel 1101, control channel 1102 and communication channel 1103 are shown to be multiplexed.

By using such a technique, FDD
A CDMA cellular radio transmission device (base station) that operates in two communication methods, namely, TDD and TDD, can be configured as shown in FIG. In addition, the FDD band of the radio frequency band /
It is assumed that the TDD bands are assigned as shown in FIG. The apparatus of FIG. 7 shows an example of a wireless transmission apparatus that outputs f1 (901) and f2 (902) of the plurality of carrier frequencies of each band shown in FIG. Further, both bands are systems in which pilot channels are multiplexed.

This radio transmission device transmits an FDD band frequency f1 of a signal which has been spread spectrum and multiplexed.
A DD band device 601, a TDD band device 602 that transmits a spectrum-spread and multiplexed signal at a TDD band frequency f2, an adder 603 that adds the two, and an antenna 604.
The FDD band device 601 comprises a pilot channel 605 for spreading and outputting pilot data 606.
And a control channel 610 that spreads and outputs control data 611.
Communication channels 1 to m (615) for spreading and outputting the respective transmission data 1 to m, an adder 620 for adding the outputs of the respective channels, and a radio for converting the output of the adder 620 into a signal of frequency f1. And a transmitter 621.

Further, the TDD band device 602 spreads pilot data 623 and outputs it.
And control channel 628 that spreads and outputs control data 629
Communication channels 1 to n (633) for spreading and outputting the respective transmission data A to L, an adder 638 for adding the outputs of the respective channels, and a radio for converting the output of the adder 638 into a signal of frequency f2. And a transmitter 639.

Further, the channels 605, 610, 615, 622, 628, 63 of the FDD band device 601 and the TDD band device 602, respectively.
3 is a spreading circuit 608, 613 for multiplying input data (pilot data, control data, transmission data) by spreading codes 607, 612, 617, 624, 630, 635 set for each channel to spread the data. , 618, 625, 631, 636, and weights W1, W for controlling transmission power of spread data.
2, W3, Wm + 2, Wa, Wb, Wc, and Wp.

In this radio transmitter, pilot channel 605 transmits pilot data 606 to spread code 1 (607).
Thus, the signal is diffused by the diffusion circuit 608, multiplied by the weight W1 (609), and output. Further, the control channel 610 spreads the control data 611 with the spreading code 2 (612) in the spreading circuit 613, multiplies the weight 614, and outputs the result. Communication channel 615
Is the spreading code of each transmission data 1 to m (616) of each channel.
17, the signal is diffused by the diffusion circuit 618, multiplied by the weight 619, and output. The data of each channel is multiplexed by the multiplexing circuit 620, up-converted by the wireless transmission unit 621, and transmitted from the antenna 604.

Similarly in the TDD band device 602,
The pilot channel 622 spreads the pilot data 623 with the spreading code 1 (624) in the spreading circuit 625, and the weight W
Multiply by a626 and output. Further, the control channel 628 uses the spreading code 2 (630) to spread the control data 629 to the spreading circuit 631.
Spread with, multiply by weight 632 and output. In the communication channel 633, each transmission data A to L (634) is spread in the spreading circuit 636 by the spreading code 635 of each channel, and the weight 637 is set.
Multiply and output. Then, the data of each channel is multiplexed by the multiplexing circuit 638, up-converted by the wireless transmission unit 639, and transmitted from the antenna 604.

In this device, the spreading codes used by the FDD and TDD may be different codes, and the transmitting antennas of the radio frequencies f1 and f2 may be separate. Furthermore, the pilot data 606 and 623 do not necessarily need to carry information, and thus may be unmodulated data (all 0s or 1s). The control channels of the FDD band and the TDD band are channels used at the time of waiting for communication and at the start of communication (line connection), and during communication, control data is transmitted along with a part of transmission data of the communication channel. I shall.

Further, an FD constructed by using a conventional technique
C for receiving signals of both D band / TDD band
FIG. 8 shows a configuration example of the DMA cellular radio reception device. This wireless receiving device includes an antenna 701 for receiving a signal and an FD.
FDD for processing D-band received signal (radio frequency f1)
The band device 702 and the TDD band device 703 that processes the received signal (radio frequency f2) of the TDD band,
The FDD band device 702 and the TDD band device 703 similarly similarly down-convert the received signal to the radio receiving unit 70.
4, 727, pilot channels 705 and 728 for processing the received signal and outputting phase information 709, chip synchronization signal 712 and cell signal level information 714, control channels 715 and 729 for outputting control data 720, and communication data The communication channels 721 and 730 that output 726 are provided.

The pilot channels 705 and 728 are
A correlation circuit 707 that performs despreading by multiplying the received signal by the spreading code 706, a phase estimation circuit 708 that obtains phase information 709 of the received signal from the despread output, and a power detection circuit 710 that calculates the received power for each sampling. And a chip synchronization circuit 71 that obtains a chip synchronization signal by integrating the output of the power detection circuit 710.
1, and from the output of the power detection circuit 710, a cell monitor circuit 713 that outputs cell signal level information representing the signal level of each cell using the same spreading code, and also control channels 715, 729 and communication channel 721, 730 is a correlation circuit 71 for despreading by multiplying the received signal by spreading codes 716 and 722.
7 and 723, and detection circuits 718 and 724 that synchronously detect the despread signal based on the phase information 709, and the binary determination that outputs the control data 720 or the communication data 726 by judging the outputs of the detection circuits 718 and 724. And a circuit 719.

In this receiving device, of the signals received from the antenna 701, the FDD band signal (radio frequency f1) is processed by the FDD band device 702, and the TDD band signal (radio frequency f2) is processed by the TDD band device. Processed by 703.

The FDD band signal is down-converted in radio receiving section 704. Pilot channel 70
In 5, the correlation circuit 707 despreads the output signal of the wireless reception unit 704 using the spreading code 706, and the phase estimation circuit 708 outputs the phase information 7 of the received signal from the despread output.
09 is detected and transmitted to the detection circuits 718 and 724 of the control channel 715 and the communication channel 721.

In the control channel 715, the correlation circuit 717 despreads the output signal of the radio receiving section 704 by using the spreading code 2 (716), and the detection circuit 718 uses this based on the phase information 709. The despread signal is synchronously detected, the binary judgment circuit 719 judges the detected data, and the control data 720 is output.

Further, in the communication channel 726, the correlation circuit 723
However, for the output signal of the wireless reception unit 704, the spread code i (72
2) is used to perform despreading, and the detection circuit 724 outputs the phase information 7
Based on 09, the despread signal is synchronously detected, and the detected data is judged by the binary judgment circuit 725 to output the communication data 726.

Further, the correlation circuit 7 of the pilot channel 705
The despread output of 07 is input to the power detection circuit 710, and the power detection circuit 710 calculates the reception power for each sampling (phase). The chip synchronization circuit 711 is the power detection circuit 7
A chip synchronization signal 712 is output by integrating (filtering) the output of 10 with a certain time constant. This chip synchronization signal is input to the correlation circuit 717 of the control channel 715 and the correlation circuit 723 of the communication channel 721, and determines the phase of despreading with the spreading code in these correlation circuits.

When the other cell uses the same spreading code 1 (706) and the phase is shifted to transmit the pilot channel, the cell monitor circuit 713 is based on the output of the power detection circuit 710. , Cell signal level information 714 representing the reception level of the pilot signal output from the base station of each cell is generated.

FIG. 13 shows a power detection circuit 71 when a phase difference (1202) of 1/4 of the spread code period (1201) is applied between cells.
An example of the output of 0 is shown. Since the spreading code 1 common to the cells is used, by shifting the despreading phase of the correlation circuit 707, it is possible to detect the reception level 1203 of the other cell in addition to the reception level 1203 of the own cell.

The transmission power of the pilot channel necessary to obtain the chip synchronization signal and cell signal level information is detected by the synchronous detection because the output of the power detection circuit 710 is integrated in the chip synchronization circuit 711 and the cell monitor circuit 713. It may be lower than the required power.

The processing in the TDD band device 703 is also FD
It is similar to the D-band device 702. The signal in the TDD band is down-converted in radio receiving section 727, and processed and decoded in pilot channel 728, control channel 729, and communication channel 730 in the same manner as the signal in the FDD band.

[0028]

However, since the CDMA cellular radio transmitter constructed by the conventional technique has the control channel in both the FDD band and the TDD band, each transmitter circuit is required. The device configuration becomes complicated. Furthermore, it is necessary to allocate spreading codes for control channels in both bands, interference increases in each band by the control channels, and the quality of pilot channels and communication channels consequently deteriorates. There is a problem.

Further, the CDMA cellular radio receiver also needs a circuit for receiving the control channels of both the FDD band and the TDD band, which causes a problem that the receiver becomes complicated.

The present invention solves such a problem, and in a CDMA cellular radio system operating FDD and TDD, simplifies the circuit configuration and reduces the amount of interference over a communication channel. An object of the present invention is to provide a wireless communication device capable of improving communication quality.

[0031]

Therefore, in the radio transmitter of the direct sequence CDMA cellular radio system of the present invention, the control channel is provided only in the FDD band. Further, in the wireless reception device, the control channel for receiving the control data is provided only in the FDD band.

Therefore, the control data is transmitted and received only in the FDD band. As described above, by reducing the control channels in the TDD band, the circuit scale can be reduced, and the interference of the control channels with the communication channels can be reduced.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is a direct spread CD for operating FDD communication and TDD communication.
In a radio transmitter of MA cellular radio system, a means for outputting a pilot channel in the FDD band, a means for outputting a control channel in the FDD band, a means for outputting a communication channel in the FDD band, and a pilot channel in the TDD band Means and communication channel
And a means for outputting in the DD band, and the control channel is T
It has no means for outputting in the DD band, and the control data of the control channel is transmitted only through the FDD band.

According to a second aspect of the present invention, the radio transmitting apparatus according to the first aspect is provided with band selection means for allocating a user's communication channel to either the FDD band or the TDD band at the time of line connection and handover. The communication data is transmitted using the communication channel of the band selected by the band selection means.

According to a third aspect of the present invention, the radio transmitting apparatus according to the first aspect is provided with means for interpolating pilot symbols into the communication channel output in the TDD band, and the pilot channel output in the TDD band is used as the communication channel. Compared to this, it is designed to transmit with low power, and on the receiving side,
Synchronous detection can be performed using the pilot symbols interpolated in the communication channel, which eliminates the need to secure high reliability of the pilot channel.

According to a fourth aspect of the present invention, in the wireless transmission device according to the first aspect, the ratio of the chip rates of the signals output in the FDD band and the TDD band is 2 ^N times (N is N ≦ 0.
, Which makes it possible to use a common spreading circuit for both bands or to operate the spreading circuits for both bands with a 2 ^N- fold basic clock.

According to a fifth aspect of the present invention, in the radio transmitting apparatus according to the first aspect, signals output in the FDD band and the TDD band are made to coincide in chip synchronization or frame synchronization, and the bands are switched. Even if
There is no need to regain chip synchronization or frame synchronization.

The invention as defined in claim 6 is based on FDD communication and T
In a radio receiver of a direct sequence CDMA cellular radio system operating with DD communication, means for receiving an FDD band pilot channel, means for receiving an FDD band control channel, and means for receiving an FDD band communication channel. , A means for receiving a pilot channel in the TDD band and a means for receiving a communication channel in the TDD band, and not a means for receiving a control channel in the TDD band. Band, and after connecting the line, receive data on the communication channel of the FDD band or TDD band.

According to a seventh aspect of the present invention, in the radio receiver of the sixth aspect, means for performing processing from the FDD band signal to initial synchronization processing and communication start, and processing during communication from the TDD band signal. And means for performing communication termination processing, and the line connection is performed in the FDD band, and after the line connection, communication is performed in the TDD band.

According to an eighth aspect of the present invention, the radio receiving apparatus according to the sixth aspect is provided with means for performing intermittent reception of the control channel of the FDD band, and the standby processing is performed from the signal of the FDD band. , Intermittent reception can reduce power consumption.

The invention described in claim 9 is based on FDD communication and T
In a wireless transmission device of a direct sequence CDMA cellular wireless system operating with DD communication, a transmitting side outputs a pilot channel in an FDD band, a control channel in an FDD band, and a communication channel in FD.
A means for outputting in the D band and a TD for the pilot channel
It has means for outputting in the D band and means for outputting the communication channel in the TDD band, and does not have means for outputting the control channel in the TDD band, and the receiving side receives the pilot channel in the FDD band. Means, means for receiving a control channel in the FDD band, means for receiving a communication channel in the FDD band, means for receiving a pilot channel in the TDD band, and means for receiving a communication channel in the TDD band, It has no means for receiving the control channel of the TDD band, the transmitting side transmits the control data only in the FDD band, and the receiving side receives the control data in the FDD band and connects the line. After that, the communication data is received on the communication channel of the FDD band or the TDD band.

According to a tenth aspect of the present invention, in the wireless transmission device according to the ninth aspect, the transmission side allocates and transmits the user's communication channel to either the FDD band or the TDD band at the time of line connection and handover. , The receiver is the FDD band or T specified by the sender.
Since the communication channel of one of the DD bands is received, it is not necessary to receive both bands at all times, and low power consumption can be achieved.

According to an eleventh aspect of the present invention, in the wireless transmission device according to the ninth aspect, the transmitting side is provided with an FDD band and a TD.
The means for transmitting the signals of the D-band signals with the same chip synchronization is provided, and the receiving side is provided with the means for performing the chip-synchronization processing common to the FDD / TDD bands. The circuit scale is reduced by sharing the circuits. Can be achieved.

According to a twelfth aspect of the present invention, in the wireless transmission device according to the ninth aspect, the transmitting side is provided with an FDD band and a TD.
A means for transmitting the signals of the D-band signal with the same frame synchronization is provided, and a means for performing the frame synchronization processing common to the FDD / TDD bands is provided on the receiving side. The circuit is reduced by the common circuit. Can be achieved.

According to a thirteenth aspect of the present invention, in the radio transmission apparatus according to the ninth aspect, the transmitting side is provided with means for interpolating pilot symbols into the communication channel output in the TDD band, and the receiving side is provided with the communication channel. It is provided with means for performing interpolative type synchronous detection using a pilot symbol in reception, since the receiving side can independently perform synchronous detection using the pilot symbol, the dependence on the pilot channel is reduced, It is possible to reduce the transmission power of the pilot channel.

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) In the first embodiment,
It is a CDMA cellular radio transmission device capable of operating in FDD and TDD. As shown in FIG. 1, this device is an FD that transmits multiplexed data at a frequency f1 of the FDD band.
The FDD band device 101 includes a D band device 101, a TDD band device 102 that transmits multiplexed data at a frequency f2 of the TDD band, an adder 103 that adds the two, and an antenna 104 that transmits a signal. , A pilot channel 105 that spreads and outputs pilot data 106, a control channel 110 that spreads and outputs control data 111, and a communication channel 1-m (that spreads and outputs each transmission data 1 to m (116). 115), an adder 120 that adds the outputs of the respective channels, and a wireless transmission unit 121 that converts the output of the adder 120 into a signal of frequency f1.
Is a pilot channel 122 that spreads and outputs pilot data 123, communication channels 1 to n (127) that spreads and outputs each transmission data A to L (128), and an adder that adds the output of each channel. 132 and a wireless transmission unit 133 that converts the output of the adder 132 into a signal of frequency f2.
This device has a T
The difference is that the DD band device 102 does not have a control channel, but other configurations are the same.

In the FDD band device 101 of this transmitting device, the pilot channel 105 spreads the pilot data 106 by the spreading code 1 (107) in the spreading circuit 108 and waits.
Multiply by 109 and output. Further, the control channel 110 spreads the control data 111 with the spreading code 2 (112) in the spreading circuit 113, multiplies the weight 114, and outputs the result. Communication channel 115
Is the spreading code 1 of each channel for each transmission data 1 to m (116)
17, the signal is diffused by the diffusion circuit 118, multiplied by the weight 119, and output. The data of each channel is multiplexed by the multiplexing circuit 120 and up-converted by the wireless transmission unit 121,
It is transmitted from the antenna 104.

In the TDD band device 102, the pilot channel 122 transmits the pilot data 123 to the spread code 1 (1
According to 24), the signal is spread by the spreading circuit 125, multiplied by the weight 126, and output. Further, the communication channel 127 spreads each transmission data A to L (128) by the spreading circuit 130 by the spreading code 129 of each channel, multiplies the weight 131, and outputs the result. The data of each channel is multiplexed by the multiplexing circuit 132, and the wireless transmitter 1
Up-converted by 33 and transmitted from antenna 104.

As described above, this radio transmitter transmits control data at the time of waiting for communication and at the time of starting communication (line connection) only through the control channel of the FDD band. Therefore,
The receiving side also receives the control data on the control channel of the FDD band, and after the line is connected to the transmitting side, shifts to the communication channel of the FDD band or the TDD band to execute data transmission / reception.

In this radio transmitter, FDD and T
The spreading code used by the DD may be a different code, and
The transmitting antennas for the radio frequencies f1 and f2 may be separate. In addition, since the pilot data 106 and 123 do not necessarily need to transmit information, unmodulated data (all 0 or 1)
But it's okay.

The chip rate ratio of signals output in the FDD band and TDD band is 2 ^N times (N is N ≦ 0.
In the above case, a spreading circuit common to both bands can be used, or the spreading circuits of both bands can be operated with a 2 ^N- fold basic clock.

As described above, in the wireless transmission device of this embodiment, since the control channel is not provided in the TDD band, the circuit scale of the transmission circuit can be reduced, and when this control channel exists, it occurs. Interference can be reduced.

(Second Embodiment) In the second embodiment,
The CDMA cellular radio transmitter of the first embodiment has a band switching function. As shown in FIG. 2, this apparatus is provided with a band selection circuit 205 for allocating the communication of users 1 to U (206) to either the FDD band or the TDD band. Other configurations are the same as those of the first embodiment (FIG. 1).

In this wireless transmitter, users 1 to U (20
When connecting the line of 6), or when handing over the user's communication from the adjacent cell by handover, the band selection circuit 205, depending on the traffic condition in each band, the required line quality of each user, etc., User communication is assigned to either the FDD band or the TDD band.

The transmission data assigned to the FDD band by the band selection circuit 205 is processed and transmitted by the FDD band device 201, and the transmission data assigned to the TDD band is processed and transmitted by the TDD band device 202. .

As described above, according to this embodiment, by providing the band selection circuit, the communication channel can be either the FDD band or the TDD band depending on the traffic conditions in each band, the required channel quality of each user, and the like. It can be allocated to one of them, and the frequency utilization efficiency can be improved.

(Third Embodiment) C of the third embodiment
The DMA cellular radio transmission apparatus interpolates pilot symbols into the data of the communication channel and transmits the data.

In this device, as shown in FIG. 3, the communication channels 1 to n (306) of the TDD band device transmit data 3
A switch 309 for switching and outputting pilot symbols 308 at a constant cycle T is provided in the 07 column. Other configurations of the TDD band device and the configuration of the FDD device are the same as those in the first embodiment (FIG. 1).

In this device, the pilot channel 301 of the TDD band device spreads the transmission data 302 (pilot data) in the spreading circuit 304 by the spreading code 1 (303), multiplies it by the weight 305, and outputs it. In the communication channel 306, the switch 309 outputs the transmission data 307, and switches and outputs the pilot symbol 308 every certain period T. The output of the switch 309 is a spreading circuit based on the spreading code 310.
It is diffused at 311 and multiplied by the weight 312 before being output. Similar operations are performed in other communication channels.

The outputs of the respective channels are multiplexed by the multiplexing circuit 313, up-converted by the radio transmission section 314 and transmitted.

In this radio transmitting apparatus, since the pilot symbol for synchronous detection is interpolated and transmitted in the transmission data string, the receiving side can perform synchronous detection by using this pilot symbol. As a result, the dependence on the pilot channel 301 can be reduced. Therefore, the wireless transmission device can reduce the power allocated to the pilot channel 301.

In FIG. 3, the weights Wb to Wm in the communication channels are used for the transmission power control and weight the transmission power between the communication channels. In this wireless transmission device, the weight Wa305 in the pilot channel is lower than the weights of the other communication channels, for example, the minimum value Min [Wb of the weights Wb to Wm.
.. Wm] is weighted with Wa <Min [Wb ... Wm] and transmitted.

The channel format of the TDD band according to the third embodiment is shown in FIG. In each communication channel, in addition to the transmission data, pilot symbol 401 is inserted every cycle T (402). The height (thickness) of each channel represents the transmission power. In this figure, while the transmission powers of the communication channels are all equal,
The pilot channel 403 indicates that it is transmitted with lower power than the communication channel.

As described above, in the TDD band, by periodically providing pilot symbols for the purpose of interpolation type synchronous detection in each communication channel, it is necessary for the pilot channel to obtain high reliability as a reference signal for synchronous detection. Disappear. By providing the pilot channel with a weight for transmitting at a power lower than that of the communication channel, the amount of interference due to the pilot channel can be reduced.

(Fourth Embodiment) In the fourth embodiment,
A CDMA cellular radio receiver capable of receiving signals in both the FDD band / TDD band. This device
As shown in FIG. 5, an antenna 501 for receiving a signal and an F
FD that processes the reception signal (radio frequency f1) of the DD band
The FDD band device 502 includes a D band device 502 and a TDD band device 503 that processes a TDD band received signal (radio frequency f2). The FDD band device 502 down-converts the received signal and a received signal. Phase information 509, chip synchronization signal 512 and cell signal level information 514.
, A control channel 515 for outputting control data 520, and a communication channel 521 for outputting communication data 526, and a TDD band device 503.
Is a wireless reception unit 527 that down-converts the received signal.
And a pilot channel 528 for processing the received signal and outputting phase information, chip synchronization signal and cell signal level information.
And a communication channel 529 for outputting communication data. This device is different from the above-described wireless reception device (FIG. 8) in that it does not have a control channel in the TDD band device 503, but other configurations are the same.

In this apparatus, the processing of the FDD band signal is performed in the same manner as in the apparatus of FIG. 8, the radio receiving section 504 down-converts the received signal, and the pilot channel 505 is received.
The phase estimation circuit 508 detects the phase information 509 from the despread output from the correlation circuit 507 and the spread code 506, and transmits it to the detection circuits 518 and 524 of the control channel 515 and the communication channel 521. In the control channel 515, the signal despread using the spreading code 2 (516) in the correlation circuit 517 is synchronously detected by the detection circuit 518 based on the phase information 509, and is judged by the binary judgment circuit 519 to make the control data 520. Is output. In the communication channel 521, a signal despread by the correlation circuit 523 using the spread code m (522) is synchronously detected by the detection circuit 524 based on the phase information 509, and is judged by the binary judgment circuit 525 to make communication data 526. Is output.

Further, the power detection circuit 510 calculates the reception power for each sampling (phase) from the correlator output of the pilot channel 505, and the chip synchronization circuit 511.
Then, by integrating with a certain time constant, the chip synchronization signal
Output 512. Using this chip synchronization signal, the correlation circuit 517 of the control channel 515 and the correlation circuit 5 of the communication channel 521
Determine the phase of despreading with the spreading code at 23. In the case of a system in which the other cell uses the same spreading code 1 (506) and the pilot channel is transmitted with the phase shifted, the cell monitor circuit 5 outputs from the output of the power detection circuit 510.
By 13, the cell signal level information 514 can be obtained.

With respect to the chip synchronization signal 511, it is not necessary to always use the pilot channel signal, and the correlator of the communication channel is configured by a digital matched filter or a plurality of sliding correlators to use the correlator output. Obviously, it is also possible to obtain chip synchronization information. It is also clear that power detection does not necessarily have to be performed to obtain the chip synchronization signal 511. Also, other cells use the same spreading code 1 (506),
It is also clear that the configuration for obtaining the cell signal level information is not necessary if the system is not a system that transmits pilot channels with a phase shift.

The processing in the TDD band device 503 is also F
It is basically the same as the DD band device 502. The signal in the TDD band is down-converted in the wireless reception unit 527, and the data in the pilot channel 728 and the communication channel 529 are processed and decoded in the same manner as the signal in the FDD band. However, in the TDD band, the control channel does not exist, so the control channel is not received. Therefore, even when using the communication channel of the TDD band,
Control data at the time of waiting for communication and at the start of communication (line connection) is received by the control channel of the FDD band, and after the line is connected to the transmission side, it shifts to the communication channel of the TDD band and executes data transmission / reception. .

As described above, in the radio receiving apparatus of this embodiment, the receiver for the control channel is deleted in the TDD band, so that the hardware can be reduced.

(Fifth Embodiment) C of the fifth embodiment
The DMA cellular radio receiving apparatus, as shown in FIG.
FDD band device 551 and TDD band device 552 (however, in FIG.
(A part for detecting the phase information from the despread output by the correlation circuit 555 and the correlation circuit 556 by the phase estimation circuit and transmitting it to the detection circuit of the control channel and the communication channel is omitted.)
In addition, a synchronization circuit 563 that outputs a frame synchronization signal 564 and a call connection processing circuit 565 that performs call connection processing until communication start
And a cell identification processing circuit 566 for identifying the nearest cell and transmitting it to the call connection processing circuit 565 (the standby processing circuit 567 and the FDD / TDD switching circuit 568 are not used in this embodiment).

In this receiving device, the initial synchronization processing and the processing up to the start of communication are performed in the FDD band. When the power is turned on, the chip synchronization signal 556 obtained by the pilot channel of the FDD band device 551 is input to the synchronization circuit 563, and the cell signal level information 557 is input to the cell identification processing circuit 566. Further, the control data 558 obtained on the control channel is the synchronization circuit 563.
And the call connection processing circuit 565.

The synchronizing circuit 563 receives the input chip synchronizing signal 5
A frame synchronization signal 564 is generated based on 56 and control data 558. This synchronizing signal is also input to the chip synchronizing circuit 571 of the TDD band device 552. Also, the cell identification processing circuit 5
66 identifies the nearest cell based on the cell signal level information 557 and conveys it to the call connection processing circuit 565. When the call connection processing circuit 565 detects an incoming call based on the control data transmitted from the base station of the cell, the call connection processing circuit 565 executes the processing up to the start of communication.

When the TDD band is used as the communication channel, the TDD band device 552 uses the chip synchronization signal 560 on the pilot channel during the communication start (line connection) processing.
Is output to the correlation circuit of the communication channel, and the decoding of the communication data 562 is started at the same time when the communication is started. Further, the chip synchronization signal 560 output from the pilot channel of the TDD band device 552 in communication is input to the synchronization circuit 563,
The synchronization circuit 563 keeps outputting the frame synchronization signal 564.

Also, cell signal level information 56 output from the pilot channel of the TDD band device 552 in communication.
1 is input to the cell identification processing circuit 566, and the cell identification processing circuit 56
Based on this, 6 monitors the handover (switching of cells) during communication. At the end of communication, the end processing is performed by the control data attached to a part of the communication data 562.

As in this embodiment, the radio receiver is
By providing means for performing processing from the FDD band signal to initial synchronization and communication start, and means for performing processing during communication and communication end processing from the TDD band signal, a receiver for the control channel in the TDD band is provided. Can be deleted. In addition, the processing up to the start of communication is FD
When the communication is performed only in the TDD band in the D band, the number of receivers for communication channels in the FDD band can be reduced and the scale of hardware can be reduced.

(Sixth Embodiment) C of the sixth embodiment
The DMA cellular radio receiver performs discontinuous reception on the control channel during standby. This device, as shown in FIG. 6, includes a standby processing circuit 567 that performs processing during standby. Other configurations are the same as those of the fifth embodiment.

In this device, the FDD band device 551 intermittently receives the control channel during standby. Every time the standby processing circuit 567 receives the control data at a certain interval, it determines whether or not it is being called (incoming call), and if it is determined that it is an incoming call, it notifies the call connection processing circuit 565 of it. Tell. In the case of an incoming call, the call connection processing circuit 565 performs the line connection processing shown in the fifth embodiment, and communication is started. After the communication is completed in the TDD band, the FDD band control channel is intermittently received again to prepare for an incoming call.

As described above, the radio receiving apparatus of the sixth embodiment is provided with means for performing the waiting process for the intermittent reception only with the signal of the FDD band, so that it is necessary to provide the control channel for the waiting in the TDD band. Therefore, it is possible to reduce hardware. Further, in this device, by performing the intermittent reception, the operation time can be shortened and the power consumption can be reduced.

(Seventh Embodiment) In the seventh embodiment,
It is a configuration of a CDMA cellular radio reception device when the CDMA cellular radio transmission device (FIG. 2) of the second embodiment is used on the transmission side.

According to the second embodiment, in this radio receiving apparatus, the communication channel is set to the FDD band or TDD according to the second embodiment.
When allocating to bands, the band of the communication channel is switched to the FDD band or TDD band according to the transmission side.

This radio receiving apparatus, as shown in FIG.
An FDD / TDD switching circuit 568 is provided for switching to the FDD band or the TDD band in response to a switching signal 569 for instructing band switching at the time of line connection. Other configurations are the same as those in the sixth embodiment.

In this device, when the transmission side allocates the communication channel to the FDD band or the TDD band and transmits the communication data, the FDD / TDD switching circuit 568 receives the switching signal 569 at the time of line connection and receives the designated band. Either the wireless reception unit 553 or 554 is operated so as to switch to. As a result, decoded data 559 or 562 is obtained.

At this time, the transmitting side uses the FDD band and T
When the DD band signal is transmitted with the chip synchronization and the frame synchronization matched, the chip synchronization signal is transmitted on the receiving side.
556 and 560 are the same. Therefore, the chip synchronization circuit 570
And 571 can be shared by one circuit. Also,
The frame sync signal 564 also matches in both bands. Therefore, when switching the signal (or channel) to be received between FDD / TDD, it is not necessary to re-establish chip synchronization and frame synchronization.

As described above, in the radio receiving apparatus of the seventh embodiment, by providing the FDD / TDD switching circuit, it is sufficient to receive only one of the FDD band and the TDD band, and always receive both bands. Since there is no need to do so, low power consumption can be achieved. Also, on the sending side,
Since the chip synchronization and the frame synchronization can be shared by providing the means for transmitting the chip synchronization and the frame synchronization in agreement with each other, the chip synchronization and the frame synchronization are re-acquired when the signal received between FDD / TDD is switched. You can eliminate the need.

(Eighth Embodiment) In the eighth embodiment,
It is a configuration of a CDMA cellular radio reception device when the CDMA cellular radio transmission device (FIG. 3) of the third embodiment is used on the transmission side.

According to the third embodiment, this radio receiving apparatus eliminates the phase estimation circuit in the pilot channel of the TDD band when the transmission data of the communication channel is interpolated with the pilot symbol and transmitted.

This receiving apparatus has the configuration of FIG. 6 and does not have a phase estimation circuit in the pilot channel of the TDD band device 552.

As described above, the channel format of the TDD band on the transmission side is as shown in FIG. 4, and in each communication channel, in addition to the transmission data, the cycle T (402)
A pilot symbol 401 is inserted for each. The heights (thicknesses) of the channels representing the transmission power of the channels are all the same in the communication channel, and the transmission power of the pilot channel 403 is lower than that of the communication channel. This is because the pilot symbols are interpolated in the communication channel, and therefore it is not necessary to obtain high reliability as the reference signal for synchronous detection in the pilot channel.

In the radio receiver, as shown in FIG.
From the DD band pilot channel, chip synchronization signal
Only 560 and cell signal level information 561 are detected. In addition,
The chip synchronization signal 560 and the cell signal level information 561 are obtained by integrating the outputs of the power detection circuits in the chip synchronization circuit 571 and the cell monitor circuit, so that there is no problem even if the transmission power of the pilot channel is low. The communication channel detection circuit 572 uniquely performs synchronous detection of received data using the interpolated pilot symbols.

In this radio receiving apparatus, the phase estimation circuit in the pilot channel of the TDD band can be eliminated and the circuit structure can be simplified. Also, on the transmitting side, the transmission power of the pilot channel can be reduced, and the interference due to the pilot channel can be reduced.

[0093]

As is apparent from the above description, in the CDMA cellular radio communication apparatus of the present invention, the control channel in the TDD band can be omitted, and the circuit scale of the transmitter and the receiver can be reduced. . Further, by omitting the control channel, the amount of interference given to the communication channel can be reduced, and the communication quality can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a CDMA cellular radio transmitter according to a first embodiment of the present invention,

FIG. 2 is a CD according to second and seventh embodiments of the present invention.
A block diagram showing an MA cellular radio transmitter,

FIG. 3 is a CD according to the third and eighth embodiments of the present invention.
A block diagram showing an MA cellular radio transmitter,

FIG. 4 is a channel format diagram showing an example of pilot channel multiplexing and pilot symbol interpolation in the third and eighth embodiments of the present invention,

FIG. 5 is a block diagram showing a CDMA cellular radio receiver according to a fourth embodiment of the present invention,

FIG. 6 is a block diagram showing a CDMA cellular radio receiver according to fifth, sixth, seventh and eighth embodiments of the present invention,

FIG. 7 is a block diagram showing a conventional CDMA cellular radio transmitter.

FIG. 8 is a block diagram showing a conventional CDMA cellular radio receiver.

FIG. 9 is a diagram showing an example of FDD communication and TDD communication;

FIG. 10 is a diagram showing an example of a case where radio frequencies for FPLMTS are assigned to an FDD band and a TDD band;

FIG. 11 is a channel format diagram showing an example of conventional pilot symbol interpolation;

FIG. 12 is a channel format diagram showing an example of conventional pilot channel multiplexing.

FIG. 13 is a diagram showing an example of cell signal level information.

[Explanation of symbols]

101, 201, 502, 551, 601, 702 FDD band device 102, 202, 503, 552, 602, 703 TDD band device 103, 120, 132, 203, 313, 603, 620, 638 Multiplexing circuit 104, 204, 501 , 550, 604, 701 Antenna 105, 122, 301, 505, 528, 570, 605, 622, 705, 728,
1101 Pilot channel 106, 123, 606, 623 Pilot data 107, 112, 117, 124, 129, 303, 310, 506, 516, 522,
607, 612, 617, 624, 630, 635, 706, 716, 722 Spread code 108, 113, 118, 125, 130, 304, 311, 608, 613, 618,
625, 631, 636 Spreading circuit 109, 114, 119, 126, 131, 305, 312, 609, 614, 619,
626, 632, 637 Weight W 110, 515, 610, 628, 715, 729, 1102 Control channel 111, 520, 558, 611, 629, 720, 729 Control data 115, 127, 306, 521, 529, 615, 633 , 721, 730, 1103
Communication channels 116, 128, 302, 307, 616, 634 Transmission data 121, 133, 314, 621, 639 Radio transmission unit 205 Band selection circuit 206 User 308, 401, 1001 Pilot symbol 309 Switch 402, 1002 Period T 504, 527 , 553, 554, 704, 727 Radio receiving section 507, 517, 523, 555, 556, 707, 717, 723 Correlation circuit 508, 708 Phase estimation circuit 509, 530, 709 Phase information 510, 710 Power detection circuit 511, 570 , 571, 711 Chip synchronization circuit 512, 556, 560, 712 Chip synchronization signal 513, 713 Cell monitor circuit 514, 557, 561, 714 Cell signal level information 518, 524, 531, 718, 724 Detection circuit 519, 525, 719, 725 Binary judgment circuit 563 Synchronization circuit 564 Frame synchronization signal 565 Call connection processing circuit 566 Cell identification processing circuit 567 Standby processing circuit 568 FDD / TDD switching circuit 569 Switching signal 801 Radio frequency F1 802 Radio frequency F2 803 Radio frequency F3 901 Radio frequency f1 902 Radio frequency f2

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A 9-191276 (JP, A) JP-A 8-130766 (JP, A) JP-A 8-265835 (JP, A) JP-A 63- 200629 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04Q ^7/ 00-7/38 H04B ⁷ /24-7/26

Claims (13)

(57) [Claims] 1. A radio transmitting apparatus of a direct sequence CDMA cellular radio system operating FDD communication and TDD communication, a means for outputting a pilot channel in an FDD band, a means for outputting a control channel in an FDD band, and a communication channel. In the FDD band, means for outputting the pilot channel in the TDD band, and means for outputting the communication channel in the TDD band,
A CDMA cellular radio transmitting apparatus having no means for outputting a control channel in a TDD band. 2. The CDMA cellular radio transmission apparatus according to claim 1, further comprising band selection means for allocating a user's communication channel to one of the FDD band and the TDD band at the time of line connection and handover. 3. A means for interpolating pilot symbols into a communication channel output in the TDD band, wherein the T
The CDMA cellular radio transmitting apparatus according to claim 1, wherein the pilot channel output in the DD band is transmitted with lower power than the communication channel. 4. A ratio of chip rates of signals output in the FDD band and the TDD band is 2 ^N times (N is N ≦ 0.
2. The CD according to claim 1, wherein
MA cellular radio transmitter. 5. The CDMA cellular radio transmitter according to claim 1, wherein the signals output in the FDD band and the TDD band have the same chip synchronization or frame synchronization. 6. In a radio receiving apparatus of a direct sequence CDMA cellular radio system operating FDD communication and TDD communication, means for receiving a pilot channel of FDD band, means for receiving a control channel of FDD band, and FDD band And a means for receiving a TDD band pilot channel, and a means for receiving a TDD band communication channel,
A CDMA cellular radio receiving apparatus having no means for receiving a TDD band control channel. 7. Means for performing processing from the signal of the FDD band to processing of initial synchronization and start of communication, and the TD.
7. The CDMA cellular radio receiving apparatus according to claim 6, further comprising means for performing processing during communication and processing for ending communication from a signal in the D band. 8. The CDMA cellular radio receiving apparatus according to claim 6, further comprising means for performing intermittent reception of the control channel of the FDD band, and performing standby processing from a signal of the FDD band. 9. In a radio transmission apparatus of a direct sequence CDMA cellular radio system operating FDD communication and TDD communication, a transmitting side outputs a pilot channel in an FDD band, and a control channel outputs in a FDD band. And means for outputting the communication channel in the FDD band, means for outputting the pilot channel in the TDD band, and means for outputting the communication channel in the TDD band,
There is no means for outputting the control channel in the TDD band, and the receiving side receives means for receiving the pilot channel in the FDD band, means for receiving the control channel in the FDD band, and receiving the communication channel in the FDD band. Means, means for receiving a pilot channel in the TDD band, and means for receiving a communication channel in the TDD band,
A CDMA cellular radio transmission apparatus having no means for receiving a control channel of a TDD band. 10. The transmission side allocates and transmits the user's communication channel to either the FDD band or the TDD band at the time of line connection and handover, and the reception side has the FDD band or TDD designated by the transmission side. The CDMA cellular radio transmission apparatus according to claim 9, wherein the communication channel of any one of the bands is received. 11. The transmission side comprises an FDD band and a TD.
10. The CDMA cellular radio according to claim 9, further comprising means for transmitting the signals of the D band by matching the chip synchronization with each other, and the receiving side having means for performing a chip synchronization process common to the FDD / TDD bands. Transmission equipment. 12. The transmitting side comprises an FDD band and a TD.
10. The CDMA cellular radio according to claim 9, further comprising means for transmitting the signals in the D band by matching the frame synchronization with each other, and the receiving side having means for performing a frame synchronization process common to the FDD / TDD bands. Transmission equipment. 13. The transmission side has means for interpolating pilot symbols into a communication channel output in the TDD band, and the reception side performs interpolation interpolation type coherent detection using pilot symbols in reception of the communication channel. CDMA according to claim 9, characterized in that it comprises means.
Cellular radio transmitter.