JP2876495B2 - Data processing 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 data processing device in a mobile communication system.

[0002]

2. Description of the Related Art A data processing apparatus of this kind is an apparatus provided on a base station side of a mobile communication system such as a digital automobile telephone and a portable telephone system. Of the transmission data of the format used in the public line. The data to be converted is voice data or non-voice data such as FAX.

FIG. 3 shows a schematic configuration of a mobile communication system provided with a conventional data processing device. 3, 21 is a mobile station, 22 is a group destination station. 23 and 24 are antennas, and 25 is a demodulation unit. Reference numeral 26 denotes a data processing device, which includes a data conversion processing unit 27, a control unit 28, and an output unit 29.

Next, the operation of the above conventional example will be described.
Data transmitted from the mobile station 21 via the antenna 23 is received by the base station 22 via the antenna 24 and transmitted from the demodulation unit 25 to the data processing device 26.
When the data is transmitted after being interleaved in a plurality of frames, the data processing device 26 does not perform a process requiring an interleave delay such as a voice decoding process on the data, and the data for the public line is transmitted in units of each frame. when performing the process of converting the format, the control unit 2
In step 8, the data is immediately converted into public line data for each frame while the still is detected, and output from the output unit 29.

[0005] Interleaving will now be described. Emotion
Error correction technology is a technology for transmitting broadcast signals without errors.
is there. An error that occurs on the communication path depends on the error pattern.
Therefore, they are classified into random errors and burst errors.
"Points of error correction coding technology" (supervised by Hideki Imai, Inc.)
According to the Japan Industrial Technology Center), random errors
Is an error that occurs independently for each transmitted bit. This
On the other hand, errors that occur intensively in a certain section
Burst error. After a bit is wrong, continue
Some bits intermittently go wrong. Also, random errors
Error-correctable code is a random error-correcting code
is there.

[0006] In mobile communications, the communication path
The main cause is the fluctuation of the received electric field strength called the so-called fluctuation
Burst error occurs. This burst error
The pattern changes variously depending on the communication path conditions.
Such errors are corrected or detected by the error correction code.
In mobile communications, random error correction is generally used.
The plus sign is used. At this time, the
Burst errors are random errors or shorter burst errors.
Interleaving is a technique for converting data. Interleaving
Is the transmission order of the error-correction-coded transmission signal.
This is a method of performing an exchange operation according to rules.
This allows the receiving side to perform the reverse of the swap operation.
(Referred to as deinterleaving)
Burst errors are converted to random errors.
You. As an example, the length of a codeword is L bits (= K ^* n)
FIG. 5 shows an interleaving method in the case of. On the sending side
In this case, the output from the error correction encoder is
As you write, L bit Write over k lines
It will be crowded. This is read and sent in k bits in the vertical direction.
I believe.

In mobile communication, a transmission signal is transmitted in units of frames.
It is common to transmit by. Currently operating in Japan
In a digital cellular telephone (PDC), one frame is
20 ms (milliseconds: 1/1000 second)
You. Error correction coding uses this one frame as a basic unit.
It is done. At this time, the error-correction-coded data
Interleave processing over multiple frames.
This operation is called frame interleaving. 6 in FIG.
4 shows an example of frame interleaving. k bits vertically
Write the transmission signal read in two directions over two frames
Go out. In frame #n, error correction coding is performed.
Information data n (error correction coded data)
2 frames at the same time as randomized
#N and # n + 1 are transmitted. this
When transmitting the error correction coded data n. Interlie
Delay (interleave delay) occurs one frame
You can see that. In FIG. 6, transmission data is transmitted in a transmission frame.
The data is shown in the upper and lower tiers for one frame.
Transmission data of 2 frames is included in the transmission frame of
The actual transmission frame
The bit positions above indicate that the two data are
Are arranged in a randomized state according to the
It is common that

FIG. 7 shows a state on the receiving side. Receiver
Then, the operation opposite to the operation on the transmitting side in FIG. 6 is performed. Sand
Inverse of interleave from received data for 2 frames
Error-correction coded data is obtained by the operation (deinterleaving)
Can be

[0009] In the error correction coding, the reception data
Error detection to check whether the data
It is assumed that possible encoding has been performed.

FIGS. 4A and 4B show high-speed associated channels.
FACCH is one transmission frame without frame interleaving.
Indicates the received data when transmitting by stealing the
You. The numbers in these figures are the frame numbers of the transmission data.
And the received data is interleaved in 4 frames
You can see that it is done. The four upper and lower signals are frame
It is used for convenience to express the state of interleave
There are four bit positions on the actual transmission frame.
Data runs according to a specific interleave pattern
It will be arranged in a damped state. In contrast
The FACCH is arranged by stealing one frame.
I have. The received signal is stealed every frame.
Perform detection. Steel detection method is steel
The sending side sends a steal flag to indicate whether
It is conceivable to transmit the data separately from the data. FIG.
FIG. 3A is a diagram illustrating received data on the base station 22 side of data transmitted from the mobile station 21 with 20 ms as one frame. In this figure, data is interleaved into four frames. FIG. 4B shows output data after data conversion by a conventional data processing device. The data processing device 26 detects the stealing for each frame, immediately converts the data of the non-stealed frame 30 and outputs the data as a frame 32, and steals the frame 30 using a FACCH (high-speed associated channel). For the information bits of frame 31
After having replaced the data of the steel frame predetermined pattern, and outputs to the public line by Uni conversion good frame 33. At this time, the data processing device 2
There is no interleave delay at 6. On the receiving side receiving this output data via the public line, after performing deinterleaving, error detection is performed on each data.

[0011]

The object of the invention is to be Solved However, the above-mentioned slave
In the conventional case, the data processing device of the base station receives a radio signal
Deinterleaving and error correction decoding
Figure 4
As shown in the frame 33 of FIG.
Replace and output to public line. Specific putter at this time
Means that there is an error in the error detection on the receiving side.
Means a pattern that can be issued. Output via public line
The receiver that receives the data performs deinterleaving processing.
However, at this time, the specific pattern also becomes 4 frames by the above processing.
Will be divided into teams. For example, Lee in FIG 4 (b)
The interleaved data of number 5 in the figure is deinterleaved.
Collected from 4 frames by
The data from frame 32 becomes part of the characteristic pattern.
You. Therefore, erroneous reception data after deinterleaving
However, there is a problem that even if it is detected, it can not always be detected reliably .

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide an excellent data processing device capable of reliably detecting data whose information bits have been lost due to stealing. It is.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a data processing apparatus in which a
A control unit for detecting stealing by a CCH (high-speed associated channel), a memory for storing received data interleaved in a plurality of frames for the number of interleaves, a processing unit for converting data with an interleave delay, Output unit that outputs the converted data, when the control unit detects stealing, information bits of a plurality of interleaved data included in the stealed frame, including past frames stored in memory, The output data is converted into a specific pattern that can be reliably detected by error detection or the like on the receiving side, and then converted and output.

[0014]

Therefore, according to the present invention, the information bits of several interleaved data included in a frame in which the information bits are lost due to stealing are replaced with data of a specific pattern by the data conversion processing unit, and then converted. by outputting Te, Ru can reliably detect the missing data information bits on the receiving side of the output data. In the present invention,
Is a steel frame in a data processing device
For all encoded data interleaved in
Error by replacing data with a specific pattern
Ensure detection is possible. This allows public lines
The receiver receiving the data via the deinterleaving process
Error detection of steel by FAC CH
Can be detected more reliably.

[0015]

FIG. 1 shows a schematic configuration of a mobile communication system having a data processing apparatus according to an embodiment of the present invention. In FIG. 1, 1 is a mobile station, and 2 is a base station.
Reference numerals 3 and 4 denote antennas, and reference numeral 5 denotes a demodulation unit. Reference numeral 6 denotes a data processing device, which includes a memory 7, a control unit 8, a data conversion processing unit 9, and an output unit 10.

Next, the operation of the above embodiment will be described.
When data interleaved into a plurality of frames (for example, four frames) is transmitted from the mobile station 1 via the antenna 3, the received data received via the antenna 4 at the base station 2 is transmitted from the demodulation unit 5 to the data processing device 6. Sent. Even when data conversion processing that does not require an interleave delay is performed on the received data, the data for the number of interleaves (4 frames) is temporarily stored in the memory 7 and the interleave is performed by the controller 8 while detecting the steal. After a delay of three frames as a delay, the data is converted into data for a public line by the data conversion processing unit 9 and output from the output unit 10.

FIGS. 2A and 2B show high-speed associated channels.
FACCH is one transmission frame without frame interleaving.
Indicates the received data when transmitting by stealing the
You. The numbers in these figures are the frame numbers of the transmission data.
And the received data is interleaved in 4 frames
You can see that it is done. The four upper and lower signals are frame
It is used for convenience to express the state of interleave
There are four bit positions on the actual transmission frame.
Data runs according to a specific interleave pattern
It will be arranged in a damped state. In contrast
The FACCH is arranged by stealing one frame.
I have. The received signal is stealed every frame.
Perform detection. Steel detection method is steel
The sending side sends a steal flag to indicate whether
It is conceivable to transmit the data separately from the data. FIG.
(A) is a diagram showing the received data in the base station 2 side of the mobile station 1 or we send et <br/> been come transmitted data as one frame 20 ms. In this figure, data is interleaved into four frames. FIG. 2B shows output data after data conversion by the data processing device 6. The data processing device 6 detects the steal for each frame, but does not convert and output the received data immediately, but performs data conversion and outputs it after a delay of three frames. At this time, the received data is
When stolen by a CH (high-speed associated channel) or the like, the information bits of the data of 4, 5, 6, and 7 included in the frame 11 include the information bits of the past frame stored in the memory 7 Thus, the specific pattern (4) that can be reliably detected by the error detection performed on the output data receiving side.
P, q, which are data interleaved into frames)
After replacing r and s as in frame 13, the frame 12 is converted as in frame 14 and output to the public line.

As described above, according to the above-described embodiment, the data conversion processing unit having an interleave delay for several interleaved data included in a frame in which information bits are lost due to stealing is provided via a public line. After receiving the output data and replacing it with a specific pattern that can be detected by error detection after deinterleaving on the receiving side, the conversion processing and output to the public line, the output data receiving side deinterleaved and detected errors This has the effect that data with missing information bits due to stealing can be reliably detected at the point in time.

[0019]

According to the present invention, as is apparent from the above-described embodiment, a plurality of interleaved data included in a stolen frame are all processed by a data conversion processing unit having an interleave delay. After converting to a specific pattern that can be detected by error detection after deinterleaving on the receiving side, and converting and outputting it, the receiving side that received this output data via the public line, This has the effect that data with missing bits can be reliably detected by error detection or the like after deinterleaving.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a mobile communication system including a data processing device according to an embodiment of the present invention.

FIG. 2A is a diagram of received data input to the device; FIG. 2B is a diagram of output data output from the device;

FIG. 3 is a schematic block diagram of a mobile communication system including a conventional data processing device.

4A is a diagram of received data input to the device; FIG. 4B is a diagram of output data output from the device;

FIG. 5 shows an interleave used for data transmission.
Conceptual diagram showing one execution example

FIG. 6 shows a transmission side used for data transmission.
Diagram showing one execution example of frame interleaving

FIG. 7 shows a receiving side used for data transmission.
Diagram showing an example of execution of frame deinterleaving

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Mobile station 2 Base station 3 Antenna 4 Antenna 5 Demodulation unit 6 Data processing unit 7 Memory 8 Control unit 9 Data conversion processing unit 10 Output unit 11 Received data with steal detection 12 Received data without steal detection 13 Frame 11 is detected by steal detection Output data processed by replacing all of a plurality of interleaved data including a specific pattern 14 Output data processed by frame 12

Claims (1)

(57) [Claims] 1. A control unit for detecting information bit steal for each frame, a memory for storing received data interleaved in a plurality of frames for the number of interleaves, and a data conversion processing unit having an interleave delay And an output unit that outputs the converted data.When the control unit detects stealing, information bits of a plurality of interleaved data included in the stealed frame are stored in a past frame stored in a memory. Including,
A data processing device characterized in that output data is converted into a specific pattern that can be reliably detected by error detection or the like on the receiving side and then converted and output.