JP2005086479A - Transmission device - Google Patents

Transmission device Download PDF

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Publication number
JP2005086479A
JP2005086479A JP2003316409A JP2003316409A JP2005086479A JP 2005086479 A JP2005086479 A JP 2005086479A JP 2003316409 A JP2003316409 A JP 2003316409A JP 2003316409 A JP2003316409 A JP 2003316409A JP 2005086479 A JP2005086479 A JP 2005086479A
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Japan
Prior art keywords
transmission
rate
qos control
means
modulation
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Pending
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JP2003316409A
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Japanese (ja)
Inventor
Kazuaki Tsukagoshi
和明 塚越
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Hitachi Kokusai Electric Inc
株式会社日立国際電気
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Priority to JP2003316409A priority Critical patent/JP2005086479A/en
Publication of JP2005086479A publication Critical patent/JP2005086479A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission device performing QoS control for efficiently transmitting information data of various services and various media between the transmission device and a connection destination such as a network and performing a variable rate. <P>SOLUTION: In the transmission device in which transmission speed of information data can be changed, QoS control adapted to changed transmission speed is performed in an input/output interface of the transmission device. The device has one of a means for correcting an error and varying a coding rate, a variable means of a modulated multivalue of a modulation system of data modulation and a variable means of the number of multiplex channels, or combination of some of them or all means. The variable rate and QoS control is performed in accordance with change of transmission speed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a transmission apparatus capable of efficiently transmitting various services or signals having different transmission conditions belonging to various media in the transmission of digital signals.

FIG. 2 is a block diagram illustrating a configuration example of a transmission / reception unit of a conventional variable rate transmission apparatus.
In FIG. 2, input / output data of the transmission apparatus 201 is input / output to a connection destination such as a network through the interface circuit 202.
In the transmission unit 203, the output data is set by the transmission unit control circuit 208 in error correction and its coding rate in the coding circuit 205, and the modulation level of data modulation is set in the data modulation circuit 206. A transmission signal 209 is output.
In the reception unit 204, control is performed by the reception unit control circuit 213 in accordance with the error correction set by the transmission unit control circuit 208, its coding rate, and the modulation multi-level number of data modulation, and the received reception signal 214 is demodulated by the data demodulating circuit 211 in correspondence with the modulation multi-value number of the data modulation of transmission, decoded by the decoding circuit 210 in correspondence with the error correction of transmission and its coding rate, and received through the interface circuit 202 Data is output to the connected network.

As a modulation method in data modulation, any of a phase modulation method such as BPSK, QPSK, 8PSK, and 16PSK, a frequency modulation method, an amplitude phase modulation method such as 16QAM, and the like can be used. Use the method for faster transmission.
For example, assuming that the modulation method can be varied from BPSK to 16PSK as the phase modulation method, up to four times the speed of the 16PSK modulation method, which is the fastest data rate, compared to the BPSK modulation method, which is the slowest data rate. Variable.

As the error correction method, any of Reed-Solomon method, BCH method, convolutional code Viterbi decoding method and the like can be used, and the high coding rate of each method is used for higher speed transmission.
For example, assuming that the coding rate can be varied from 1/4 to 3/4, the coding rate 3 /, which is the fastest data rate, with respect to the coding rate 1/4, which is the slowest data rate. With 4, the speed can be changed up to 3 times.

By the operation as described above, the information transmission rate can be changed by varying the error correction and the coding rate thereof or the modulation multi-level number of data modulation or a combination of both.
Then, by using this function and changing the transmission rate in response to the change in the transmission path between the transmission apparatuses 201, the transmission efficiency between the transmission apparatuses can be improved.

Moreover, there exist patent document 1-patent document 3 as a prior art, for example.

JP 2000-183849 A

JP-A-11-234241

JP-A-10-224322

However, in a connection destination such as a network through an interface circuit, traffic fluctuates depending on various services to be connected and information data of various media. If the traffic increases corresponding to the variable data transmission rate, a simple connection through the interface circuit makes it easy to generate a call loss, resulting in a problem that the efficiency due to the variable rate decreases.

The present invention has been made in view of the above prior art, solves the above-described conventional problems, and efficiently transmits information data of various services and various media between a transmission apparatus and a connection destination such as a network. It is an object of the present invention to provide a transmission apparatus that performs QoS (Quality of Service) control and variable rate.

In order to solve the above-mentioned conventional problems, the first aspect of the present invention performs QoS control adapted to the changed transmission rate at the input / output interface of the transmission device in a transmission device capable of changing the transmission rate of information data. It is characterized by that.

In order to solve the above-described conventional problems, the present invention is the transmission apparatus according to the first aspect of the present invention, which has means for error correction and variable coding rate, and is adapted for changing the transmission rate. And performing QoS control.

In order to solve the above-described conventional problems, the present invention is the transmission apparatus according to the first aspect of the present invention, comprising means for varying the modulation level of the data modulation method, and changing the transmission rate. It is characterized in that QoS control is performed in conformity with the above.

In order to solve the above-described conventional problems, the present invention is the transmission apparatus according to the first aspect of the present invention, comprising means for changing the number of multiplexed channels, and performing QoS control adaptively to changes in the transmission rate. It is characterized by performing.

In order to solve the above-described conventional problems, the present invention is the transmission apparatus according to the first aspect of the present invention, wherein error correction and means for varying the coding rate, the modulation multi-level number of the data modulation method And any one of, or any combination, or all of the means for changing the number of multiplexed channels, and performing variable rate and QoS control adaptively to changes in transmission speed. To do.

According to the present invention, since the interface connection is performed while performing QoS control with respect to the traffic fluctuation at the connection destination of the network and the like and the data transmission rate in which the transmission section is variable, the occurrence of call loss can be suppressed, and various services and Information data of various media can be efficiently transmitted between a transmission apparatus and a connection destination such as a network, and the entire transmission capacity and throughput can be improved.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a transmission / reception unit of an embodiment of the QoS controlled variable rate transmission apparatus of the present invention.
In FIG. 1, input / output data of the transmission apparatus 101 is input / output to a connection destination such as a network by performing QoS control through the interface circuit 102.
In the transmission unit 103, output data is set by the transmission unit control circuit 108 in error correction and its coding rate in the coding circuit 105, and in the data modulation circuit 106, the modulation level of data modulation is set in the data modulation circuit 106. The multiplexed number set by the control circuit 108 is multiplexed in the channel multiplexing circuit 107 and output as a transmission signal 109.

In the receiving unit 104, control is performed by the receiving unit control circuit 113 in accordance with the error correction and coding rate set by the transmitting unit control circuit 108, the modulation multi-level number of data modulation, and the number of multiplexed channels. The received signal 114 is separated by the channel separation circuit 112 in correspondence with the number of transmission channel multiplexes, demodulated by the data demodulation circuit 111 in correspondence with the modulation level of transmission data modulation, transmission error correction and Decoding is performed by the decoding circuit 110 in accordance with the coding rate, and the received data is output to the network or the like of the connection destination through the interface circuit 102.

Here, the control operations of the transmission unit control circuit 108 and the reception unit control circuit 110 performed in response to the variable transmission rate are performed in conjunction with the QoS control of the interface circuit 102.
In FIG. 1, a QoS signal 123 is given to the encoding circuit 105, the data modulation circuit 106, and the channel multiplexing circuit 107 of the transmission unit 103.
The QoS signal 123 is given to any one or any combination or all of the encoding circuit 105, the data modulation circuit 106, and the channel multiplexing circuit 107, and the QoS signal 123 is matched to each transmission rate. Control is made.

Further, in FIG. 1, the QoS signal 124 is extracted from the decoding circuit 110, the data demodulation circuit 111, and the channel separation circuit 112 of the reception unit 104.
The QoS signal 124 is subjected to QoS control in accordance with the receiving speed even if it is extracted from any one, any combination, or all of the decoding circuit 110, the data demodulation circuit 111, and the channel separation circuit 112. The
Normally, it is only necessary to determine in advance in which signal area the QoS signal is given on the transmission side, and to extract the QoS signal 124 in accordance with the QoS control on the transmission side.

As a modulation method in data modulation, any of a phase modulation method such as BPSK, QPSK, 8PSK, and 16PSK, a frequency modulation method, an amplitude phase modulation method such as 16QAM, and the like can be used as in the conventional technique. Use a modulation system with a large number of multiple values for higher-speed transmission.
For example, assuming that the modulation method can be varied from BPSK to 16PSK as the phase modulation method, the 16PSK modulation method with the fastest data rate is four times faster than the BPSK modulation method with the slowest data rate. Can be changed.

As in the conventional technology, any of the Reed-Solomon method, BCH method, convolutional code Viterbi decoding method, etc. can be used as an error correction method, and the high coding rate of each method can be used for faster transmission. use.
For example, assuming that the coding rate can be varied from 1/4 to 3/4, the coding rate 3 /, which is the fastest data rate, with respect to the coding rate 1/4, which is the slowest data rate. With 4, the speed can be changed up to 3 times.

  Channel multiplexing includes multi-carrier schemes, multiplexing schemes in the frequency domain using OFDM (Orthogonal Frequency Division Multiplex), CDMA (Code Domain Multiple Access), OF / CDMA (Orthogonal Frequency Multicode Amplitude Decoding Amplitude Decoding Amplitude Decoding Amplitude Decoding Amplitude Decoding M Any of the multiplexing methods using spreading codes can be used, and assuming that the number of multiplexed channels can be varied from 1 channel to 10 channels, the data rate is the lowest when using 1 channel and the maximum is 10 times faster. Can be changed.

FIG. 3 shows a configuration example of the encoding circuit 105 according to the embodiment of the present invention.
The encoding circuit 105 uses a plurality of encoding schemes (encoding schemes such as convolutional encoding, Reed-Solomon, and BCH) prepared in advance by a transmission control signal from the transmission control circuit 108 and a desired encoding rate. The system and the coding rate are selected.
Then, the QoS signal 123 is given to the selected encoding method and encoding rate to perform encoding with QoS control.

FIG. 4 shows a configuration example of the data modulation circuit 106 according to the embodiment of the present invention.
The data modulation circuit 106 is configured to select a desired multilevel modulation scheme from a plurality of multilevel modulation schemes (BPSK, QPSK, 16QAM, etc.) prepared in advance by a transmission control signal from the transmission control circuit 108.
Then, the QoS signal 123 is given to the selected multi-level modulation scheme to perform multi-level modulation with QoS control.

FIG. 5 shows an example of channel multiplexing by the channel multiplexing circuit 107 according to the embodiment of the present invention.
This is a case where the frequency multiplexing of the block by the subcarrier modulation signal having the same bandwidth is shown, and the channel bandwidth of the subchannel modulation signal is equally spaced. Multiplexing is performed by arranging them at equal intervals in the frequency direction, and converted into one signal.
Then, the QoS signal 123 is given to each sub-channel, and multiplexing with QoS control is performed.

FIG. 6 shows another example of channel multiplexing by the channel multiplexing circuit 107 according to the embodiment of the present invention.
Expresses frequency multiplexing of blocks using subcarrier modulation signals with different bandwidths. For example, subchannel modulation signals with different numbers of subcarriers in the OFDM modulation scheme have different channel bandwidths. The signals are multiplied by the sub-channel modulation signal, arranged in the frequency direction so that the channel bands do not overlap, multiplexed, and converted into one signal.
Then, the QoS signal 123 is given to each sub-channel, and multiplexing with QoS control is performed.

In the above-described embodiment, an apparatus using three functions of variable coding rate, variable modulation multi-level number, and variable number of multiplexing has been described. However, one of the three functions, two, or three functions are shown. A variable rate transmission apparatus having a combination of

According to such a QoS control variable rate transmission apparatus of the present invention, it is possible to perform interface connection while performing QoS control with respect to traffic fluctuations at a connection destination such as a network and a data transmission rate in which a transmission section is variable. become.

As described above in detail, in the embodiment of the present invention, the QoS control adapted to the transmission rate to be changed is performed by the input / output interface circuit of the transmission apparatus, and the error correction and the coding rate are varied. Function for performing QoS control adaptively to changes in transmission rate, Function for performing QoS control adaptively to changes in transmission rate by means for varying the modulation level of the data modulation method, Means for varying the number of multiplexed channels The function of performing QoS control adaptively to the change of the transmission rate by the above, having one of the functions, the function of performing the QoS control adaptively to the change of the transmission rate by two of these means, or The QoS control variable rate transmission apparatus having a function of performing QoS control in conformity with the change of the transmission speed by all of these variable means.

Therefore, according to the embodiment of the present invention, since the interface connection is performed while performing the QoS control with respect to the traffic fluctuation at the connection destination of the network or the like and the data transmission rate in which the transmission section is variable, the occurrence of the call loss can be suppressed. Thus, a QoS control variable rate transmission apparatus capable of efficiently transmitting information data of various services and various media between a transmission apparatus and a connection destination such as a network can be provided.

Furthermore, according to the embodiment of the present invention, in response to a variable data transmission rate, when traffic increases, a call loss is likely to occur, and the problem that the efficiency due to the variable rate is reduced is solved. Provided is a QoS controlled variable rate transmission apparatus capable of efficiently transmitting information data of various services and various media between a transmission apparatus and a connection destination such as a network.

As described above, according to the present invention, in a transmission device capable of changing the transmission rate of information data, the QoS control transmission device performs QoS control adapted to the changed transmission rate at the input / output interface of the transmission device.
In such a transmission apparatus, the variable rate and the QoS control can be adapted to the change in the transmission speed by including any one of the following (A), (B), (C), or any combination or all of them. It is a transmission device that performs.
(A) It has means for varying the error correction and its coding rate, and performs QoS control adaptively to changes in the transmission rate.
(B) It has means for changing the modulation multi-value number of the data modulation method, and performs QoS control adaptively to the change of the transmission rate.
(C) It has means for changing the number of multiplexed channels, and performs QoS control adaptively to changes in the transmission rate.

That is, according to the present invention, in a transmission device capable of changing the transmission rate of information data, QoS control adapted to the changed transmission rate is performed at the input / output interface of the transmission device, and error correction and its code are performed. For changing the transmission rate, including any one of, or any combination of, a variable rate variable means, a data modulation modulation method, a variable multi-value number variable means, and a channel multiplex number variable means. It is adapted to perform variable rate and QoS control.

The transmission apparatus according to the present invention includes various wireless transmission systems that require transmission of priority information based on priority information, various wireless transmission systems that require QoS control, such as a broadband wireless access system in a quasi-millimeter wave band. This is a transmission device suitable for an outdoor device of (FWA system).

It is a block diagram which shows the structure of the transmission / reception part of one Embodiment of the QoS control variable rate transmission apparatus of this invention. It is a block diagram which shows the structural example of the transmission / reception part of the conventional variable rate transmission apparatus. 1 shows a configuration example of an encoding circuit 105 according to an embodiment of the present invention. 1 shows a configuration example of a data modulation circuit 106 according to an embodiment of the present invention. An example of channel multiplexing by the channel multiplexing circuit 107 according to the embodiment of the present invention is shown. Another example of channel multiplexing by the channel multiplexing circuit 107 according to the embodiment of the present invention will be described.

Explanation of symbols

101, 201: Transmission device 102: Interface circuit (with QoS control)
202: Interface circuit (no QoS control)
103, 203: transmission unit 104, 204: reception unit 105, 205: encoding circuit 106, 206: data modulation circuit 107: channel multiplexing circuit 108, 208: transmission unit control circuit 109, 209: transmission signal 110, 210: Decoding circuits 111, 211: Data demodulating circuit 112: Channel separation circuit 113, 213: Receiver control circuits 114, 214: Received signal

Claims (5)

  1. In a transmission device that can change the transmission speed of information data,
    A transmission apparatus characterized in that QoS control adapted to a transmission rate to be changed is performed at an input / output interface of the transmission apparatus.
  2. The transmission apparatus according to claim 1, wherein
    Having means for error correction and variable coding rate;
    A transmission apparatus that performs QoS control in response to a change in transmission speed.
  3. The transmission apparatus according to claim 1, wherein
    Means for varying the modulation multi-level number of the data modulation method;
    A transmission apparatus that performs QoS control in response to a change in transmission speed.
  4. The transmission apparatus according to claim 1, wherein
    Means for changing the number of multiplexed channels;
    A transmission apparatus that performs QoS control in response to a change in transmission speed.
  5. The transmission apparatus according to claim 1, wherein
    Any one of, means for varying error correction and coding rate, means for varying the modulation level of the data modulation method, means for varying the number of multiplexed channels, or any combination or all of them Have
    A transmission apparatus that performs variable rate and QoS control in response to a change in transmission speed.
JP2003316409A 2003-09-09 2003-09-09 Transmission device Pending JP2005086479A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007043108A1 (en) * 2005-09-30 2007-04-19 Mitsubishi Denki Kabushiki Kaisha Wireless communication system and wireless communication method
JP2009535911A (en) * 2006-04-25 2009-10-01 マイクロソフト コーポレーション Coding and modulation of variable OFDM subchannels
JP2010148021A (en) * 2008-12-22 2010-07-01 Hitachi Ltd Radio base station apparatus and wireless communication system
JP2011019272A (en) * 2010-09-03 2011-01-27 Mitsubishi Electric Corp Wireless communication system and wireless communication method
WO2011074681A1 (en) 2009-12-14 2011-06-23 日本電気株式会社 Communication apparatus and communication control method
CN102664722A (en) * 2005-09-30 2012-09-12 三菱电机株式会社 Wireless communication system and wireless communication method
US9065687B2 (en) 2006-12-12 2015-06-23 Microsoft Technology Licensing, Llc Cognitive multi-user OFDMA
US9363120B2 (en) 2007-05-08 2016-06-07 Microsoft Technology Licensing, Llc OFDM transmission and reception for non-OFDM signals
US9363795B2 (en) 2008-01-25 2016-06-07 Microsoft Technology Licensing, Llc Orthogonal Frequency Division Multiple Access with carrier sense
US9386055B2 (en) 2006-05-12 2016-07-05 Microsoft Technology Licensing, Llc Signaling to application lack of requested bandwidth

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4602409B2 (en) * 2005-09-30 2010-12-22 三菱電機株式会社 Wireless communication system and wireless communication method
JPWO2007043108A1 (en) * 2005-09-30 2009-04-16 三菱電機株式会社 Wireless communication system and wireless communication method
US9065596B2 (en) 2005-09-30 2015-06-23 Mitsubishi Electric Corporation Wireless communication system and wireless communication method
CN102664722A (en) * 2005-09-30 2012-09-12 三菱电机株式会社 Wireless communication system and wireless communication method
WO2007043108A1 (en) * 2005-09-30 2007-04-19 Mitsubishi Denki Kabushiki Kaisha Wireless communication system and wireless communication method
JP2009535911A (en) * 2006-04-25 2009-10-01 マイクロソフト コーポレーション Coding and modulation of variable OFDM subchannels
US10182367B2 (en) 2006-05-12 2019-01-15 Microsoft Technology Licensing Llc Signaling to application lack of requested bandwidth
US9386055B2 (en) 2006-05-12 2016-07-05 Microsoft Technology Licensing, Llc Signaling to application lack of requested bandwidth
US9641273B2 (en) 2006-12-12 2017-05-02 Microsoft Technology Licensing, Llc Cognitive multi-user OFDMA
US9065687B2 (en) 2006-12-12 2015-06-23 Microsoft Technology Licensing, Llc Cognitive multi-user OFDMA
US9866418B2 (en) 2006-12-12 2018-01-09 Microsoft Technology Licensing, Llc Cognitive multi-user OFDMA
US9774415B2 (en) 2006-12-12 2017-09-26 Microsoft Technology Licensing, Llc Cognitive multi-user OFDMA
US10177953B2 (en) 2007-05-08 2019-01-08 Microsoft Technology Licensing, Llc OFDM transmission and reception for non-OFDM signals
US9363120B2 (en) 2007-05-08 2016-06-07 Microsoft Technology Licensing, Llc OFDM transmission and reception for non-OFDM signals
US9755879B2 (en) 2007-05-08 2017-09-05 Microsoft Technology Licensing, Llc OFDM transmission and reception for non-OFDM signals
US9742529B2 (en) 2008-01-25 2017-08-22 Microsoft Technology Licensing, Llc Orthogonal frequency division multiple access with carrier sense
US9363795B2 (en) 2008-01-25 2016-06-07 Microsoft Technology Licensing, Llc Orthogonal Frequency Division Multiple Access with carrier sense
US8503295B2 (en) 2008-12-22 2013-08-06 Hitachi, Ltd. Base station and access control method for cellular wireless communication
JP2010148021A (en) * 2008-12-22 2010-07-01 Hitachi Ltd Radio base station apparatus and wireless communication system
US8811169B2 (en) 2009-12-14 2014-08-19 Nec Corporation Communication device and communication control method
WO2011074681A1 (en) 2009-12-14 2011-06-23 日本電気株式会社 Communication apparatus and communication control method
JP2011019272A (en) * 2010-09-03 2011-01-27 Mitsubishi Electric Corp Wireless communication system and wireless communication method

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