JP2000278759A - Transmission timing controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute transmission timing control capable of changing burst timing by extracting transmission timing information from received data transmitted from a base station to a terminal, forming a transmission timing trigger and generating transmission data. SOLUTION: At receiving data from plural terminals 200, a base station 100 instructs respective terminals 200 to move transmission timing in order to intersect spread codes allocated to respective terminals 200 at right angles. The instruction is sent by inserting it into data generated by a transmission timing generation part 111 in the base station 100. In this case, training is executed between the base stations 100 and each terminal 200 and the transmission timing used as an initial value is stored in an initial value transmission timing storage part. The initial part of burst data sent from the terminal 200 uses the initial value obtained by training and a transmission timing generation part 12 outputs a transmission timing trigger to a transmission data generation part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission timing control device for a transmission / reception system of mobile communication, and more particularly to a communication system using a CDMA system for transmitting / receiving data between a base station and a terminal. The present invention relates to a transmission timing control device that controls transmission timing when transmitting in a burst.

[0002]

2. Description of the Related Art In a system using direct spread (DS), which is one of the spread spectrum systems, a PN (pseu) having a bit rate larger than the information rate to be communicated is used.
The carrier wave is modulated using a do noise (pseudo noise) code, and the frequency is spread and transmitted. On the receiving side, only signals having the same bit sequence as the PN code are extracted from the received radio waves by the correlator and restored to information data. CDMA
For example, in direct spreading, transmitting stations such as users using the same frequency are separated by pseudo-orthogonal codes.

[0003] In some CDMA wireless systems, in data transmission / reception between a base station and a terminal, transmission timing control for transmitting data from the terminal in bursts is known.

Conventionally, a CDMA radio system that controls the timing of a transmission burst of a terminal of this type has been disclosed in “TIA (Telecommunications Industry Associat).
ion) / EIA (Electronic Industries Association)
/ IS-95 ", the terminal only performs fixed transmission timing control, and there is no system that performs transmission timing control according to instructions from the base station.

[0005]

SUMMARY OF THE INVENTION Such a conventional IS
In the transmission timing control method of the −95 system,
Since the terminal transmits at a certain timing determined by the system, when the base station receives multiple terminals,
There is a problem that the spreading codes assigned to the terminals are not optimally orthogonal. If the spreading code is not optimally orthogonal, the CD
The quality in the MA wireless system is degraded.

An object of the present invention is to provide a transmission timing control apparatus capable of performing transmission timing control for varying a burst timing according to an instruction from a base station and optimally orthogonalizing signals received at the base station. With the goal.

[0007]

A transmission timing control apparatus according to the present invention is a transmission timing control apparatus for performing transmission burst timing control of a terminal capable of bidirectional communication with a base station. Means for transmitting transmission timing information for changing transmission timing, the terminal includes: extraction means for extracting transmission timing information from reception data transmitted from the base station; and initial transmission timing for storing a transmission timing value to be transmitted first. Value storage means;
A transmission timing generator for generating a transmission timing trigger from transmission timing information and a transmission timing value, and transmission data generator for generating transmission data based on the generated transmission timing trigger are provided.

[0008] A transmission timing control device according to the present invention comprises:
In a transmission timing control device for performing transmission burst timing control of a terminal capable of bidirectional communication with a base station, the base station includes means for transmitting transmission timing information for changing the transmission timing of the terminal, and the terminal includes: Extraction means for extracting transmission timing information from received data sent from the station; pre-transmission timing value storage means for storing the last transmission timing value of burst data transmitted by the terminal; transmission timing information and pre-transmission timing value And a transmission data generating means for generating transmission data based on the generated transmission timing trigger.

A transmission timing control device according to the present invention comprises:
The transmission timing generator may include a counter for counting transmission timing information, and the transmission timing generator may generate a transmission timing trigger based on an output of the counter.

[0010] The transmission timing control device according to the present invention comprises:
The transmission timing generation unit may include a storage unit that stores a past value of the transmission timing information, and the transmission timing generation unit may generate a transmission timing trigger based on the past value stored in the storage unit.

[0011] The transmission timing control device according to the present invention comprises:
Weighting means for weighting the transmission timing information may be provided, and the transmission timing generating means may generate a transmission timing trigger based on the transmission timing information weighted by the weighting means.

A transmission timing control device according to the present invention comprises:
Code conversion means for code conversion of transmission timing information, addition means for adding the output of the code conversion means and the output of the accumulation means, accumulation means for accumulating the addition result by the addition means, threshold storage means for storing a threshold, Comparing means for comparing a threshold value with a value accumulated by the accumulating means may be provided, and the transmission timing generating means may generate a transmission timing trigger based on an output of the comparing means.

A transmission timing control device according to the present invention comprises:
The transmission timing information, which is code-converted by the code conversion unit, may be shifted to change the transmission timing amount, and the adding unit may add the output of the shifting unit and the output of the accumulating unit.

[0014] The initial transmission timing value storage means may store initial values of transmission timing obtained by training the base station and the terminal. A value stored two times before may be stored as a past value.

The two-way communication may be a mobile communication using spread spectrum and code division multiple access (CDMA).

[0016]

Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 is a block diagram showing a configuration of a transmission / reception system of mobile communication according to a first embodiment of the present invention, which is an example applied to a communication system using CDMA.

In FIG. 1, reference numeral 100 denotes a base station capable of transmitting transmission timing information to change the transmission timing of a terminal, and 200 denotes a mobile station having means for changing burst timing from transmission timing information from the base station. , The terminals 300 and 310 are the base station 100 and the terminal 20
0 antenna. The base station 100 and the terminal 200
Is composed of the following transmitting side and receiving side, respectively.

The transmitting section 110 of the base station 100 includes a transmission timing generating section 111, an error correction coding section 112, a spread modulation section 113, and a radio modulation section 114. The radio modulation section 114 is connected to the antenna 300. The receiving unit 120 of the base station 100 is a wireless demodulating unit (wireless receiving unit)
121, a spread demodulation unit 122, an error correction decoding unit 123, and a received data reproduction unit 124.

The transmission timing generation unit 111 transmits a signal from the base station 100 to the terminal 20 to change the transmission timing of the terminal.
Generate transmission timing information to be sent for 0.

The error correction coding unit 112 has a CRC (cyclic redundancy check) for error detection.
Performs coefficient calculation, convolutional coding, and interleave transform.

On the other hand, terminal 200 is a transmission timing control device 10 for performing transmission timing control in accordance with an instruction from the base station.
And a transmission unit 220 that receives transmission data input through the transmission timing control device 10 and a transmission unit 220 that transmits transmission data at transmission timing controlled by the transmission timing control device 10.

The receiving section 210 of the terminal 200
The wireless communication apparatus includes a wireless demodulation unit (wireless reception unit) 211, a spread demodulation unit 212, an error correction decoding unit 213, and a reception data processing unit 214 connected to the communication unit 10. Further, transmitting section 220 of terminal 200 includes transmission data processing section 221, error correction coding section 222, spreading modulation section 223, and radio modulation section 224.

The transmission timing control device 10 is for performing transmission timing control in which a terminal changes burst timing from transmission timing information from a base station, and extracts transmission timing information from received data transmitted from the base station. A transmission timing information extraction unit 11 (extraction means), a transmission timing generation unit 12 (transmission timing generation means) for interpreting the transmission timing information, calculating a change amount of the transmission timing of the terminal to generate a transmission timing, An initial transmission timing value storage unit 13 (initial transmission timing value storage unit) that stores an initial value of the transmission timing obtained by training of the terminal, and a transmission data generation unit 14 that generates transmission data based on a transmission timing trigger ( Transmission data generating means).

The operation of the transmission / reception system of mobile communication using CDMA configured as described above will be described below. [Operation of Transmitter 110 of Base Station 100] Base Station 100
Inserts the timing information to be transmitted by the terminal 200 by the transmission timing generation unit 111 into the original transmission data according to a certain rule, and the transmission timing generation unit 111 converts the transmission data with the inserted timing information into an error correction coding unit. Output to 112. The error correction coding section 112 performs error correction coding on the transmission data and outputs the result to the spread modulation section 113.

The spread modulation section 113 spread-modulates the transmission data subjected to the error correction coding with the spread code BSPN in synchronization with the system clock to generate spread data. The spread data is converted to a radio frequency by radio modulation section 114 and transmitted to terminal 200 as a radio signal from the end of antenna 300. [Operation of Receiving Unit 210 of Terminal 200] A radio signal from the base station 100 is received at the end of the antenna 310 of the terminal 200, demodulated into a baseband signal by the radio demodulating unit 211, and then transmitted to the spread demodulating unit 212. . Spreading demodulation section 212 demodulates this data using spreading code BSPN to generate demodulated data.

In the error correction decoding section 213, the radio demodulation section 2
The data demodulated in step 11 is subjected to error correction decoding to generate decoded data.
0 is output to the reception data processing unit 214 through the transmission timing information extraction unit 11. The reception data processing unit 214 performs various processing of the reception data and outputs the reception timing of the reception data to the transmission timing generation unit 12. [Operation of the transmitting unit 220 of the terminal 200] The transmitting unit 220 of the terminal 200 inputs the transmission data processed by the transmission data processing unit 221 of the transmission unit 220 to the transmission data generation unit 14 of the transmission timing control device 10, and transmits the transmission data. Data generator 14
Error correction encoding unit 22 at the transmission timing generated by
Output to 2.

[0027] Error correction coding section 222 performs error correction coding on the transmission data and outputs the result to spreading modulation section 223. The spread modulator 223 reads the data on which the error correction coding has been performed, and further performs spread modulation using another spread code PSPN synchronized with the spread code BSPN of the receiver 210 to generate spread data. The generated spread data is transmitted to the antenna 31 via the wireless modulation unit 224.
At the zero end, the signal is converted into a radio wave and transmitted to the base station 100. [Operation of Transmission Timing Control Apparatus 10] When the reception data is input to the transmission timing information extraction unit 11, the transmission timing information extraction unit 11 is inserted at a predetermined position from the input reception data. The transmission timing information is extracted, and the extracted transmission timing information is output to the transmission timing generation unit 12. Further, the reception data input to the transmission timing information extraction unit 11 is transmitted to the reception data processing unit 2.
14 is output.

The initial transmission timing value storage section 13 stores the initial transmission timing value, and this initial transmission timing value is output to the transmission timing generation section 12.

The reception timing obtained by the reception data processing section 214 is input to the transmission timing generation section 12.

The transmission timing generator 12 generates a transmission timing trigger, which is the transmission timing of burst data of the terminal 200, from the reception timing, the transmission timing information, and the initial transmission timing value, and transmits the generated transmission timing trigger to the transmission data generator. 14 is output.

Transmission data from the transmission data processing unit 221 is input to the transmission data generation unit 14, and the transmission data generation unit 14 generates transmission data in accordance with the transmission timing trigger.

Next, the operation of the transmission timing control device 10, which is a feature of the present embodiment, will be described in more detail.

Generally, in a CDMA radio system, by assigning a spreading code to each terminal 200,
The terminal 200 is identified and multiplexed. The base station 100 that receives a plurality of terminals 200 at the same time spreads and demodulates the transmission data of each terminal 200 by despreading the multiplexed received signal with the orthogonal code assigned to each terminal 200. In this system, orthogonal codes are used as spreading codes. Orthogonal codes have the property that the cross-correlation is zero if the two codes are orthogonal,
When two or more types of orthogonal codes are multiplexed, it is desirable that they are all received at the same timing.

Therefore, as a result of receiving a plurality of terminals 200, base station 100 transmits each terminal 200 in order to orthogonalize the spreading code assigned to each terminal 200.
0 is instructed to move the transmission timing.

Usually, such an instruction is transmitted by the transmission timing generator 111 of the base station 100 by inserting it into data transmitted from the base station 100. For example, when the transmission timing information is 1 bit, “1” means that the transmission timing is advanced by a certain time T, and “0” means that the transmission timing is delayed by T.

Since terminal 200 does not know the initial transmission timing, training is performed between base station 100 and terminal 200 and used as an initial value of the transmission timing. This initial value is stored in the initial transmission timing value storage unit 133.
Is stored.

As described above, the transmission timing generator 12 outputs a transmission timing trigger to the transmission data generator 14 using the initial value obtained by the training at the beginning of the burst data transmitted by the terminal 200.

Next, the transmission timing information is extracted by the transmission timing information extraction unit 11 from the reception data in which the transmission timing information is inserted in the base station 100. When the transmission timing information is 1 bit as described above,
“1” or “0”, and extracted “1” or “0”
Are input to the transmission timing generator 12.

The transmission timing generator 12 generates a transmission timing trigger by advancing the timing by the time T if the bit of the transmission timing information is "1" and delaying the timing by the time T when the bit is "0". And
This transmission timing trigger is output to the transmission data generator 14.

The transmission data generator 14 outputs transmission data based on the transmission timing trigger obtained from the transmission timing generator 12.

In this way, terminal 200 changes the timing of transmission data in accordance with an instruction from base station 100.

As described above, terminal 200 changes the transmission timing in accordance with the initial value obtained by training and the instruction from base station 100, so that base station 100 always has optimal orthogonality. As a result, it is possible to obtain the CDMA wireless system with higher quality.

As described above, the transmission timing control device 10 according to the first embodiment includes a transmission timing information extraction unit 11 that extracts transmission timing information from data from the base station 100, Transmission timing generation unit 12 for generating
An initial transmission timing value storage unit 13 that stores an initial value obtained by training with the base station 100 as a transmission timing to be transmitted first by the base station 100, and a transmission that generates transmission data based on a transmission timing trigger of the transmission timing generation unit 12. With the configuration including the data generation unit 14, the base station 100
The terminal 200 changes the transmission timing according to the instruction from the base station 100, so that the base station 100 can always obtain the optimal orthogonality earlier, and a high-quality CDMA wireless system can be constructed. Second Embodiment FIG. 2 is a block diagram showing a configuration of a transmission timing control device according to a second embodiment of the present invention. In the description of the transmission timing control device according to the present embodiment, the same components as those in FIG. 1 are denoted by the same reference numerals. The overall configuration of the transmission / reception system for mobile communication not shown in FIG. 2 is the same as in the first embodiment.

In FIG. 2, the transmission timing control device 2
0 is a transmission timing information extraction unit 11 for extracting transmission timing information from reception data transmitted from the base station.
A transmission timing generator 12 that interprets the transmission timing information to determine the amount of change in the transmission timing of the terminal and generates the transmission timing, and stores a previous transmission timing value that stores the last transmission timing of the burst data transmitted by the terminal It comprises a section 21 (previous transmission timing value storage means) and a transmission data generation section 14 for generating transmission data based on a transmission timing trigger.

The second embodiment has a configuration in which a previous transmission timing value storage unit 21 is provided in place of the initial transmission timing value storage unit 13 of FIG.

Hereinafter, the operation of the transmission timing control device 20 configured as described above will be described. Note that the operation of the entire transmission / reception system and the basic operation of the transmission timing control device are the same as those in the first embodiment, and a description of the operation of this portion will be omitted.

In the first embodiment, the transmission timing determined by training the base station 100 and the terminal 200 is used as an initial value, and transmission of burst data is always started at the initial value at the beginning. If the propagation states of the base station 100 and the terminal 200 are significantly different from each other, it may not be optimal within one burst.

Therefore, in the second embodiment, the last timing value of the previous burst is set to be the initial value of the next burst. As a result, the optimum state is achieved more quickly.

First, the initial value of the transmission timing obtained by the training is stored in the previous transmission timing value storage unit 21.
Is stored.

Next, as in the first embodiment, the base station 10
In response to the instruction from 0, the terminal 200 changes the timing of the transmission data, and when the burst of the data to be transmitted ends, the previous transmission timing value storage unit 21 inputs the data from the transmission timing generation unit 12. The transmitted timing value is stored.

The transmission timing generator 12 uses the value of the previous transmission timing value storage 21 to generate the first transmission timing trigger of the burst to be transmitted, and outputs it to the transmission data generator 14.

The transmission data generator 14 generates transmission data in accordance with the transmission timing trigger.

As described above, terminal 200 updates the initial value obtained by training for each burst of data to be transmitted, so that base station 100 always obtains optimal orthogonality earlier. That means
A high quality CDMA wireless system is constructed.

As described above, the transmission timing control device 20 according to the second embodiment is provided with the previous transmission timing value storage unit 21 for storing the last transmission timing of the burst data transmitted by the terminal. In addition to the same effects as in the first embodiment, the effect is obtained that the optimum orthogonality can be obtained earlier depending on the propagation characteristics. Third Embodiment FIG. 3 is a block diagram illustrating a configuration of a transmission timing control device according to a third embodiment of the present invention. In the description of the transmission timing control device according to the present embodiment, the same components as those in FIG. 1 are denoted by the same reference numerals.

In FIG. 3, the transmission timing control device 3
0 is a transmission timing information extraction unit 11 for extracting transmission timing information from reception data transmitted from the base station.
A counter unit 31 (counter means) for counting transmission timing information, a transmission timing generation unit 12 for interpreting the transmission timing information, determining a change amount of the transmission timing of the terminal to generate a transmission timing, and a base station. And an initial transmission timing value storage unit 13 for storing an initial value of transmission timing obtained by training the terminal, and a transmission data generation unit 14 for generating transmission data based on a transmission timing trigger.

The third embodiment has a configuration in which a counter 21 for counting transmission timing information output from the transmission timing information extraction unit 11 to the transmission timing generation unit 12 is added to the configuration of FIG. ing.

Hereinafter, the operation of the transmission timing control device 30 configured as described above will be described.

In the first and second embodiments, the base station 10
The terminal 200 constantly changes the transmission timing in accordance with the transmission timing information from 0. However, if the transmission timing information is the same in the direction of moving forward or in the direction of delaying for a certain period of time, the terminal 200 always changes the transmission timing. Rather, changing the timing for a certain period of time has the advantage that the number of times the transmission data generator 14 is operated is reduced, and power consumption can be reduced, for example, when realized by hardware. The third embodiment realizes such an operation.

As described in the first embodiment, when the transmission timing information is 1 bit, it is “1” or “0”;
The extracted bit information of “1” or “0” is input to the transmission timing generator 12.

Now, assuming that the number of times “1” or “0” continues for a certain period of time is M (M is an arbitrary positive integer), the transmission timing generation unit 12 sets “1” continuously for M times.
Alternatively, when “0” is output by the transmission timing information extraction unit 11, a transmission timing trigger changed to be delayed or advanced by the time T × M times is output to the transmission data generation unit 14.

The bits of the transmission timing information need to be continuously "1" or "0". If not, the transmission timing must be changed each time.

As described above, the counter 21 counts “1” or “0” M times consecutively, and if different from the previous bit, instructs the transmission timing generation unit 12 how many times the transmission timing has been changed. . That is, the counter 21 is set to M
If "1" or "0" continues successively, the count value "M" is output, and if the bit is different from the previous bit, the count value "1" is output. Here, the bit is changed from twice to M-1.
No value is output during this time.

When there is no output from the counter 21, the timing generator 12 does not output a transmission timing trigger to the transmission data generator 14.

As described above, when the transmission timing is continuously advanced or delayed, the CDMA wireless system in which the operation of the transmission data generation unit 14 is reduced is constructed by changing the transmission timing by one batch. .

As described above, the transmission timing control device 30 according to the third embodiment includes the counter unit 3 for counting transmission timing information output from the transmission timing information extraction unit 11 to the transmission timing generation unit 12.
Since the number 1 is provided, in addition to the same effect as that of the first embodiment, the number of times of operating the transmission data generation unit 14 can be reduced, and power consumption can be reduced when realized by hardware, for example. Fourth Embodiment FIG. 4 is a block diagram showing a configuration of a transmission timing control device according to a fourth embodiment of the present invention. In the description of the transmission timing control device according to the present embodiment, the same components as those in FIG. 3 are denoted by the same reference numerals.

In FIG. 4, transmission timing control device 40 includes transmission timing information extraction section 11 for extracting transmission timing information from reception data transmitted from the base station.
A counter unit 31 for counting the transmission timing information, a storage unit 41 (storage unit) for storing the previous and previous values of the transmission timing information, and interpreting the transmission timing information to change the transmission timing of the terminal. Transmission timing generation unit 12 for calculating transmission timing and generating transmission timing
And an initial transmission timing value storage unit 1 for storing initial values of transmission timing obtained by training the base station and the terminal.
3 and a transmission data generator 14 for generating transmission data based on a transmission timing trigger.

In the third embodiment, the storage unit 41 for storing the previous and previous values of the transmission timing information output from the transmission timing information extraction unit 11 to the transmission timing generation unit 12 is added to the configuration of FIG. The configuration is provided.

Hereinafter, the operation of the transmission timing control device 40 configured as described above will be described.

In the third embodiment, if the transmission timing information from base station 100 is different from the last time, terminal 200 always changes the transmission timing. For example, if the last two times are "advance only by time T", the last time is "delay only by time T", and the current time is "advance only by time T", it is better to advance the transmission timing by time T in the total of three times, An advantage is that the number of times that the transmission data generation unit 14 operates is reduced, and power consumption can be reduced when the transmission data generation unit 14 is realized by hardware, for example.

In the fourth embodiment, in order to realize the above method, the storage unit 41 stores the previous transmission timing information two times before.

Based on the previous transmission timing information obtained from the storage unit 41 and the current transmission timing information obtained from the transmission timing information extraction unit 11, the counter 21 sends the transmission timing change count to the transmission timing generation unit 12 based on the previous transmission timing information and the current transmission timing information obtained from the transmission timing information extraction unit 11. Instruct. That is, if the current value is “1”, “0”, and “1” in the order of 2 times, the previous time, and the previous time, the counter 21 does not instruct the transmission timing generation unit 12 at the time of the previous time and the previous time. At this time, "1" is designated.

Here, the time delay when terminal 200 changes the transmission timing will be described.

Since the transmission timing information before and after the previous transmission is stored in the storage unit 41, the change of the actual transmission timing is delayed by two times.

Therefore, when an instruction to advance or delay the transmission timing comes in order, even if the transmission timing information is stored for an even number of times and combined with the current information, the timing information is advanced or delayed only once. It turns out that it is good.

From this, a CDMA radio system in which the operation of the transmission data generator 14 is reduced is constructed by delaying or advancing the transmission timing by the time T only once after the number of times specified in order.

As described above, the transmission timing control device 40 according to the fourth embodiment stores the values of the transmission timing information output from the transmission timing information extraction unit 11 to the transmission timing generation unit 12 last time and two times before. Since the storage unit 41 is provided, the effect that the operation of the transmission data generation unit 14 can be further reduced compared to the third embodiment can be obtained, in addition to the same effect as the first embodiment. Fifth Embodiment FIG. 5 is a block diagram showing a configuration of a transmission timing control device according to a fifth embodiment of the present invention. In the description of the transmission timing control device according to the present embodiment, the same components as those in FIG. 1 are denoted by the same reference numerals.

In FIG. 5, the transmission timing control device 5
0 is a transmission timing information extraction unit 11 for extracting transmission timing information from reception data transmitted from the base station.
A transmission timing information weighting unit 51 (weighting means) for weighting the transmission timing information; a transmission timing generation unit 12 for interpreting the transmission timing information and calculating the amount of change in the transmission timing of the terminal to generate the transmission timing; A pre-transmission timing value storage unit 21 for storing the last transmission timing of burst data transmitted by the terminal;
A transmission data generator 14 for generating transmission data based on a transmission timing trigger.

In the fifth embodiment, a transmission timing information weighting section 51 for weighting transmission timing information output from the transmission timing information extraction section 11 to the transmission timing generation section 12 is added to the configuration of FIG. It has a configuration.

Hereinafter, the operation of the transmission timing control device 50 configured as described above will be described.

In the first embodiment, the transmission timing information from the base station 100 is one bit, and one bit of this transmission timing information indicates “advance by time T” or “delay by time T”. If the transmission timing information is 2 bits, the following operation can be performed. For example, if 2 bits are used, the transmission timing is not equal, but “11” → the transmission timing is advanced by 4 T. “10” → the transmission timing is advanced by T. “01” → the transmission timing is delayed by T. “00” → time Weighting can be performed such as delaying the transmission timing by 4T.

By performing such weighting,
In particular, an advantage is that the time required for training when obtaining the initial value can be reduced.

In the fifth embodiment, the transmission timing information is weighted by the transmission timing information weighting section 51 in order to realize the above method.

The transmission timing information weighting unit 41 instructs the transmission timing generation unit 12 on the number of transmission timing changes based on the transmission timing information obtained from the transmission timing information extraction unit 11. That is, the base station 100 performs a small timing adjustment after largely changing the timing with one transmission timing information at the beginning of training.

As described above, based on the result of weighting the transmission timing information, the time 4T or the time T
By delaying or advancing the transmission timing by minutes, a CDMA wireless system with reduced training time is constructed.

As described above, the transmission timing control device 50 according to the fifth embodiment includes a transmission timing information weighting unit that weights transmission timing information output from the transmission timing information extraction unit 11 to the transmission timing generation unit 12. Since the 51 is provided, the effect that the training time can be reduced is obtained in addition to the effect similar to the first embodiment. If the training time can be reduced, the base station can obtain the optimal orthogonality faster. Sixth Embodiment FIG. 6 is a block diagram illustrating a configuration of a transmission timing control device according to a sixth embodiment of the present invention. In the description of the transmission timing control device according to the present embodiment, the same components as those in FIG. 1 are denoted by the same reference numerals.

In FIG. 6, the transmission timing control device 6
0 is a transmission timing information extraction unit 11 for extracting transmission timing information from reception data transmitted from the base station.
And a code conversion unit 61 (code conversion means) for performing code conversion on the transmission timing information from the transmission timing information extraction unit 11.
An adder 62 (adder) for adding the output of the code converter 61 and the output of the accumulator 63 (accumulator);
, A comparing unit 64 (comparing unit) for comparing the result of the accumulating unit 63 with the threshold value from the threshold value storing unit 65 (threshold value storing unit), and a threshold value storing unit 65 for storing the threshold value. A transmission timing information weighting unit 51 for weighting the transmission timing information, a transmission timing generation unit 12 for interpreting the transmission timing information, determining a change amount of the transmission timing of the terminal to generate the transmission timing, and a burst transmitted by the terminal. The transmission timing value storage unit 21 stores the last transmission timing of data, and the transmission data generation unit 14 that generates transmission data based on a transmission timing trigger.

In the sixth embodiment, a code conversion unit 61 for performing code conversion of transmission timing information is added to the configuration shown in FIG.
An addition unit 62 that adds the output of the code conversion unit and the output of the accumulation unit 63, an accumulation unit 63 that accumulates the result of the addition unit 62,
A comparison unit 64 for comparing the result of the accumulation unit 63 with a threshold value and a threshold value storage unit 65 for storing the threshold value are added.

Hereinafter, the operation of the transmission timing control device 60 configured as described above will be described.

In the first and second embodiments, the base station 10
The terminal 200 constantly changes the transmission timing in accordance with the transmission timing information from 0, but the transmission timing information from the base station 100 changes “advance” or “delay” within a certain period of time. Therefore, if the timing is changed collectively for an average of a certain period of time rather than constantly changing, the number of times of operating the transmission data generating unit 14 is reduced, and for example, power consumption can be reduced when realized by hardware. Is an advantage.

In the first and second embodiments, when the transmission timing information is only one bit of "1" or "0", the transmission timing is always changed depending on whether the transmission timing is advanced or delayed.

In the sixth embodiment, the transmission timing is not changed even by 1-bit transmission timing information by averaging a certain period of time.

The code conversion unit 61 changes “1” to “1” from “1” or “0” obtained from the transmission timing information.
In addition, the code conversion from “0” to “−1” is performed and the result is output to the addition unit 62.

The adding section 62 adds the output of the accumulating section 63 and the output of the code converting section 61 and outputs the result to the accumulating section 63.

The accumulating section 63 accumulates the addition result and outputs the result to the adding section 62 and the comparing section 64.

The comparing section 64 compares the result of the accumulating section 63 with the threshold value stored in the threshold value storing section 65, and
If the result is larger than the threshold value, it instructs the timing generation unit 12 how many times the transmission timing has been changed.

The timing generator 12 does not output a transmission timing trigger to the transmission data generator 14 unless the number of times of transmission timing change is output from the comparator 64.

As described above, a CDMA radio system in which the operation of the transmission data generating unit 14 is reduced is constructed by advancing or delaying the transmission timing by an average of a fixed time.

As described above, the transmission timing control device 60 according to the sixth embodiment further includes a code conversion section 61 for performing code conversion of the transmission timing information extraction section 11, and an output of the code conversion section 61 and an accumulation section 63. Adder 62 for addition
And an accumulator 63 for accumulating the result of the adder 62, a comparator 64 for comparing the result of the accumulator 63 with the threshold, and a threshold storage 65 for storing the threshold. In addition to the same effect as described above, the effect that the operation of the transmission data generation unit 14 can be further reduced can be obtained. Seventh Embodiment FIG. 7 is a block diagram illustrating a configuration of a transmission timing control device according to a seventh embodiment of the present invention. In the description of the transmission timing control device according to the present embodiment, the same components as those in FIG. 6 are denoted by the same reference numerals.

In FIG. 7, the transmission timing control device 7
0 is a transmission timing information extraction unit 11 for extracting transmission timing information from reception data transmitted from the base station.
A code conversion unit 61 that performs code conversion on the transmission timing information from the transmission timing information extraction unit 11, and a code conversion unit 6
A shift unit 71 (shift means) for shifting the output of No. 1;
An addition unit 62 that adds the output of the shift unit 71 and the output of the accumulation unit 63, an accumulation unit 63 that accumulates the result of the addition unit 62,
A comparison unit 64 that compares the result of the accumulation unit 63 with the threshold value from the threshold value storage unit 65, a threshold value storage unit 65 that stores the threshold value,
A transmission timing information weighting unit 51 for weighting the transmission timing information; a transmission timing generation unit 12 for interpreting the transmission timing information and calculating a change amount of the transmission timing of the terminal to generate the transmission timing; and a burst data transmitted by the terminal. And a transmission data generation unit 14 for generating transmission data based on a transmission timing trigger.

In the seventh embodiment, a shift unit 71 for shifting the output of the code conversion unit 61 is added to the configuration of FIG.

Hereinafter, the operation of the transmission timing control device 70 configured as described above will be described.

In the sixth embodiment, when the transmission timing information from the base station 100 is only one bit of “1” or “0”, the transmission timing changes by time T in one information. In the seventh embodiment, by shifting before adding, the amount of transmission timing is changed according to the shift amount, so that the time required for training with 1-bit information can be reduced.

Now, let us consider a case where the base station 100 wants to change the transmission timing for 2T with 1-bit information. In this case, information that changes by one bit for a time of 2T is inserted into normal transmission data that is not transmission timing information, and transmitted to the terminal 200.

Terminal 200 receives the information and sets the shift amount of shift section 71 to 1 bit.

The shift unit 71 shifts one bit to the left when "1" and shifts one bit to the right when "-1".
Output to 2. Similarly, if a 2-bit shift is performed, a change in the transmission timing amount corresponding to time 4T can be obtained.

The other operations are the same as in the sixth embodiment.

As described above, a CDMA radio system capable of reducing the time required for training can be constructed by advancing or delaying the transmission timing by an average of a fixed period of time 2 ⁿ × T from the transmission timing information of 1 bit. Is done.

As described above, the transmission timing control device 70 according to the seventh embodiment further includes the shift unit 71 that shifts the output of the code conversion unit 61 that performs code conversion of transmission timing information. An effect is obtained that the training time can be further reduced as compared with the embodiment.

Therefore, by applying the transmission timing control device having such features to a base station reception system or a mobile station reception system, the transmission / reception performance of the system can be improved.

The transmission timing control device according to the above embodiment can be applied to the transmission timing control device on the receiving side of the mobile communication using the code division multiple access as described above. The present invention is not limited thereto, and is applicable to all devices (for example, a base station receiving system and a mobile station receiving system) as long as the communication system performs mobile communication.

Further, the configuration of the terminal, the configuration, type, number, connection method, and the like of each circuit section of the transmission timing control device are not limited to the above-described embodiments.

[0112]

In the transmission timing control apparatus according to the present invention, the base station includes means for transmitting transmission timing information for changing the transmission timing of the terminal, and the terminal transmits the reception data transmitted from the base station. Extracting means for extracting transmission timing information from the transmission timing value storage means for storing a transmission timing value to be transmitted first; transmission timing generating means for generating a transmission timing trigger from the transmission timing information and the transmission timing value; And a transmission data generating means for generating transmission data based on the transmission timing trigger, so that it is possible to perform transmission timing control for varying the burst timing according to an instruction from the base station, and Signals can be optimally orthogonalized.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a transmission timing control device according to a first embodiment to which the present invention has been applied.

FIG. 2 is a block diagram illustrating a configuration of a transmission timing control device according to a second embodiment to which the present invention has been applied.

FIG. 3 is a block diagram illustrating a configuration of a transmission timing control device according to a third embodiment to which the present invention has been applied.

FIG. 4 is a block diagram illustrating a configuration of a transmission timing control device according to a fourth embodiment to which the present invention has been applied.

FIG. 5 is a block diagram illustrating a configuration of a transmission timing control device according to a fifth embodiment to which the present invention has been applied.

FIG. 6 is a block diagram showing a configuration of a transmission timing control device according to a sixth embodiment of the present invention.

FIG. 7 is a block diagram illustrating a configuration of a transmission timing control device according to a seventh embodiment to which the present invention has been applied.

[Explanation of symbols]

10, 20, 30, 40, 50, 60, 70 transmission timing control device, 11 transmission timing information extraction unit (extraction unit), 12 transmission timing generation unit (transmission timing generation unit), 13 initial transmission timing value storage unit (initial Transmission timing value storage means), 14 transmission data generation section (transmission data generation means), 21 previous transmission timing value storage section (previous transmission timing value storage means), 31 counter section (counter means), 41 storage section (storage means) , 51
Transmission timing information weighting unit (weighting means), 6
1 code conversion unit (code conversion unit), 62 addition unit (addition unit), 63 accumulation unit (accumulation unit), 64 comparison unit (comparison unit), 65 threshold storage unit (threshold storage unit), 71
Shift section (shift means), 100 base stations, 110 base station transmission section, 111 transmission timing generation section, 200
Terminal (mobile station), 210 Terminal receiving section, 211 Radio demodulation section (radio reception section), 212 Spread demodulation section, 213
Error correction decoding section, 214 received data processing section, 220
Terminal transmission section, 221 transmission data processing section, 222
Error correction coding section, 223 spreading modulation section, 224 radio modulation section

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tetsu Araki 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. F-term (reference) 5K022 EE01 EE21 EE36 5K034 AA05 EE03 HH01 HH02 HH06 HH26 5K067 AA23 CC10 DD11 DD25 EE02 EE10 HH23 KK15

Claims (10)

[Claims] 1. A transmission timing control apparatus for performing transmission burst timing control of a terminal capable of bidirectional communication with a base station, wherein the base station sends transmission timing information for changing the transmission timing of the terminal. An extraction unit for extracting transmission timing information from reception data transmitted from the base station; an initial transmission timing value storage unit for storing a transmission timing value to be transmitted first; and the transmission timing information and A transmission timing control device, comprising: transmission timing generation means for generating a transmission timing trigger from the transmission timing value; and transmission data generation means for generating transmission data based on the generated transmission timing trigger. 2. A transmission timing control apparatus for performing transmission burst timing control of a terminal capable of bidirectional communication with a base station, wherein the base station sends transmission timing information for changing the transmission timing of the terminal. An extraction unit for extracting transmission timing information from reception data transmitted from the base station, and a pre-transmission timing value storage unit for storing a last transmission timing value of burst data transmitted by the terminal. Transmission timing generating means for generating a transmission timing trigger from the transmission timing information and the previous transmission timing value; and transmission data generating means for generating transmission data based on the generated transmission timing trigger. Transmission timing control device. 3. The transmission timing generator according to claim 1, further comprising a counter for counting the transmission timing information, wherein the transmission timing generator generates a transmission timing trigger based on an output of the counter. The transmission timing control device according to any one of the above. 4. A storage unit for storing a past value of the transmission timing information, wherein the transmission timing generation unit generates a transmission timing trigger based on the past value stored in the storage unit. Claims 1 to 3
The transmission timing control device according to any one of the above. 5. A weighting means for weighting the transmission timing information, wherein the transmission timing generating means generates a transmission timing trigger based on the transmission timing information weighted by the weighting means. The transmission timing control device according to claim 1. 6. A code conversion means for performing code conversion of the transmission timing information, an addition means for adding an output of the code conversion means and an output of an accumulation means, an accumulation means for accumulating an addition result by the addition means, Threshold value storing means, and comparing means for comparing the accumulated value by the accumulating means with the threshold value, wherein the transmission timing generating means generates a transmission timing trigger based on an output of the comparing means. The transmission timing control device according to any one of claims 1 to 5, wherein 7. A shift unit for shifting transmission timing information code-converted by the code conversion unit to change a transmission timing amount, wherein the addition unit adds an output of the shift unit and an output of the accumulation unit. 7. The transmission timing control device according to claim 6, wherein: 8. The transmission timing control device according to claim 1, wherein said initial transmission timing value storage means stores an initial value of transmission timing obtained by training the base station and the terminal. 9. The transmission timing control device according to claim 4, wherein the storage unit stores a value of the transmission timing information of a previous time and a value of the transmission timing information two times before as a past value. 10. The two-way communication includes spread spectrum and code division multiple access (CDMA).
3. The transmission timing control device according to claim 1, wherein the transmission timing control device performs mobile communication using iple Access).