JP2010239460A - Communication system, communication device and communication method involving diffusion process - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication system without decreasing the use efficiency of a whole diffusion code regardless of a change in the number of users. <P>SOLUTION: A communication device 10 applied to the communication system includes a diffusion code table management section 28 for and selecting a diffusion code table in response to a diffusion rate of a management device included in diffusion information notified from a management device 30 of a system 90, and generating a diffusion code set in response to the number of users and the user number included in the diffusion information. When the diffusion code table management section 28 supplies the diffusion code set to a diffusion section 18 and an inverse diffusion section 22 for data transmission, the device 10 also modulates data generated by the data generation section 12 for transmission by a modulation section 14, diffusion-processes the modulated data by a diffusion section 16 with the use of a diffusion code set 106 section 12, and further transmits the resulting data through an RF (Radio Frequency) signal transmission section 18. When receiving data, the device 10 inversely diffusion-processes the data received by the RF signal receiving section 20 by the inverse diffusion section 22 with the use of diffusion code set 116, demodulates the resulting data by a demodulation section 24, and then supplies it to a data processing section 26. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a communication system, a communication apparatus, a communication method, and a communication program that involve spreading processing.

  Conventionally, a communication device uses a code division multiple access (CDMA) system to perform a spreading process using a spreading code on a signal to be transmitted and encode the received signal. There is one that performs despreading processing using the spreading code and performs decoding.

  Such a communication apparatus can obtain a wideband signal by, for example, performing spread spectrum processing with a spreading code on a narrowband modulated signal to be transmitted. Also, by spreading processing using a spreading code different from other communication devices and adjusting the processing gain, both devices can transmit signals simultaneously and receive correctly due to the effect of spreading gain even if a collision occurs Can do.

  For example, the spread spectrum communication system described in Patent Document 1 is a cyclic code sequence based on a gold code configured as a product code of a 2 ^ k-1 chip length M-sequence code or two M-sequence PN codes. 2k bit information transmission is possible by using phase and Q phase as data channels, and 2 ^ k chip length cyclic code obtained by inserting "0" at the end of M-sequence code or gold code etc. 2k + 2 bits of information can be transmitted for a sequence.

  In addition, the spreading coding apparatus described in Patent Document 2 can use the orthogonal M sequence or the orthogonal Gold code for the spreading code processing, thereby speeding up the spreading processing as compared with the configuration using the Walsh sequence, and further increasing the spreading sequence length. Can be long.

JP 2007-258849 A JP-A-11-275052

  However, in the conventional communication system, the number of users participating in communication is estimated in advance, and the spreading code is fixed and the spreading code number is assigned so as to correspond to the number of users. Even in such a case, a plurality of spreading codes cannot be assigned to the user who uses the spreading code, and the usage efficiency is poor.

  In view of such a problem, an object of the present invention is to provide a communication system that prevents a decrease in utilization efficiency with respect to the total number of spreading codes even when the number of users changes.

  The present invention provides a communication system including a plurality of communication devices that perform communication via a communication network, and a management device that assigns a spreading code used for the communication to each of the plurality of communication devices. The management device determines communication status monitoring means for detecting the communication status of the plurality of communication devices and the spreading code to be assigned to the plurality of communication devices in the connection state according to the detected communication status. And spreading code allocating means for notifying a plurality of communication devices in the connection state of spreading information relating to the allocation of the spreading code, the communication device including at least one indicating a relationship between the communication device and the spreading code. Having the above spreading code table in advance, spreading processing is performed on the data transmitted by this communication apparatus using this spreading code. A spreading processing means, a despreading processing means for performing a despreading process on the data received by the communication device using the spreading code, and selecting the spreading code table according to the spreading information, and the spreading code table And a spreading code table management means for generating a spreading code set indicating information for each communication device used for spreading and despreading and supplying the spread code set to the spreading processing means and the despreading processing means. The means performs the spreading process using the spreading code set, and the despreading means performs the despreading process using the spreading code set.

  The present invention also relates to a communication system including a plurality of communication devices that transmit data via a communication network, and a management device that assigns a spreading code used for transmission to each of the plurality of communication devices. The management device determines communication status monitoring means for detecting the communication status of the plurality of communication devices, and the spreading code to be assigned to the plurality of communication devices in the connection state according to the detected communication status. A spreading code assigning means for notifying a plurality of communication devices in the connected state of spreading information relating to the spreading code assignment, wherein the communication device is at least one or more indicating a relationship between the communication device and the spreading code. Spreading code table in advance, and spreading processing is performed on the data transmitted by the communication apparatus using the spreading code. And the spread code table is selected according to the spread information, and based on the spread code table, a spread code set indicating information for each communication device used for the spread processing is generated and the spread code means is provided to the spread processing means. And a spreading code table management means to be supplied. The spreading processing means performs the spreading processing using the spreading code set.

  Furthermore, the present invention provides a communication system including a plurality of communication devices that receive data via a communication network, and a management device that assigns a spread code used for the communication to each of the plurality of communication devices. The management apparatus determines communication status monitoring means for detecting the communication status of the plurality of communication devices, and determines the spreading code to be assigned to the plurality of communication devices in the connection state according to the detected communication status. And spreading code assigning means for notifying a plurality of communication devices in the connected state of spreading information relating to the spreading code assignment, the communication device comprising at least one indicating a relationship between the communication device and the spreading code. Having the above spreading code table in advance, despreading processing is performed on the data received by this communication device using this spreading code The spread code table is selected according to the spread information and the spread code table indicating information for each communication device used for the despread process is generated based on the spread code table. And a spreading code table management means for supplying to the despreading processing means, the despreading processing means performing this despreading processing using this spreading code set.

  Furthermore, the present invention is connected to a communication system including a management device that manages a spreading code, is assigned this spreading code by the management device according to the communication status, and spreads data to be transmitted using this spreading code. In a communication apparatus that includes a spread processing means that performs processing and a despreading processing means that performs despreading processing on the received data using this spreading code, and communicates with other communication devices via a communication network, This device has in advance a plurality of spreading code tables indicating the relationship between this spreading code and this communication device, receives spreading information relating to this assigned spreading code, and this spreading code table according to this spreading information Based on this spreading code table, a spreading code indicating information for each communication device used for spreading and despreading is selected. A spreading code table management means that generates a set and supplies it to the spreading processing means and the despreading processing means. The spreading processing means performs the spreading processing using the spreading code set, and the despreading processing means The despreading process is performed using this spreading code set.

  Furthermore, the present invention is connected to a communication system including a management device that manages a spreading code, is assigned this spreading code by the management device according to the communication status, and spreads data to be transmitted using this spreading code. In a communication apparatus including a spread processing means for performing processing and transmitting data to another communication apparatus via a communication network, the apparatus includes a plurality of spread code tables indicating the relationship between the spread code and the transmission apparatus. It has in advance, receives spreading information related to this assigned spreading code, selects this spreading code table according to this spreading information, and based on this spreading code table, information for each communication device used for spreading A spreading code table management means for generating a spreading code set indicating Spreading processing means, and performs the spreading process using the spreading code set.

  Furthermore, the present invention is connected to a communication system including a management device that manages a spreading code, is assigned this spreading code by this management device according to the communication status, and reverses the received data using this spreading code. A communication device that receives data from another communication device via a communication network, wherein the device includes a plurality of spreading codes indicating the relationship between the spreading code and the receiving device. A receiving apparatus used for despreading, having a table in advance, receiving spreading information relating to the assigned spreading code, selecting the spreading code table according to the spreading information, and based on the spreading code table; Including spreading code table management means for generating a spreading code set indicating information for each and supplying the code to the despreading processing means The despreading means is characterized by performing the despreading processing using the spreading code set.

  Further, according to the present invention, a spreading code is managed by a management device of a communication system including a plurality of communication devices, and the spreading code is assigned by the management device according to a communication situation. Communication that includes a spreading process using the spreading code and a despreading process using the spreading code for the received data to communicate with a plurality of communication devices via a communication network. In the method, the method uses a plurality of spreading code tables indicating the relationship between the spreading code that the communication apparatus has in advance and the communication apparatus, and transmits spreading information related to the assigned spreading code from the management apparatus to the communication apparatus. Selects the spreading code table according to the spreading information, and spreads the code based on the spreading code table. And a spreading code table management step for generating a spreading code set indicating information for each communication device used for despreading and supplying the spread code set to the spreading processing step and the despreading processing step. This spreading process is performed using a code set, and this despreading process step is characterized by performing this despreading process using this spreading code set.

  Furthermore, the present invention is a communication that is connected to a management device that manages a spreading code and is mounted on each of a plurality of communication devices that perform communication using this spreading code assigned by the management device according to the communication status. In the program, the program uses a plurality of spreading code tables indicating the relationship between the spreading code that the communication apparatus has in advance and the communication apparatus, and uses the spreading code for data transmitted by the communication apparatus. The communication device provides the spreading processing step for performing the spreading processing, the despreading processing step for performing the despreading processing on the data received by the communication device using the spreading code, and the spreading information on the assigned spreading code. Received from the management device, select this spreading code table according to this spreading information, based on this spreading code table A spreading code table that generates information for each communication device used for spreading and despreading and generates a spreading code set to be supplied to the spreading processing step and the despreading processing step. This spreading process is performed using this spreading code set, and this despreading process step is characterized by performing this despreading process using this spreading code set.

  According to the present invention, in the communication system, the management device determines the number of users, the user number indicating the assignment of the spreading code, and the total number of spreading codes managed by the management device according to the connection status of the communication device. By generating information including the spreading factor shown as spreading information and notifying each communication device, a spreading code corresponding to the number of users can be assigned to each communication device. In addition, when the number of users decreases, each communication device can perform spreading processing and despreading processing on a plurality of digits of data by using a plurality of spreading codes, so that the capacity is higher at a higher speed. Can communicate.

It is a block diagram which shows one Example of the communication apparatus which concerns on this invention. It is a block diagram which shows one Example of the communication system to which the communication apparatus which concerns on FIG. 1 is applied. FIG. 3 is a diagram showing spreading code assignment in the case of 64 users in the embodiment shown in FIGS. 1 and 2. FIG. 3B is a continuation of FIG. 3A showing spreading code assignment in the case of 64 users in the embodiment shown in FIGS. FIG. 3B is a continuation of FIG. 3B showing spreading code assignment in the case of 64 users in the embodiment shown in FIGS. FIG. 3 is a diagram showing spreading code assignment in the case of 32 users in the embodiment shown in FIGS. 1 and 2. FIG. 4A is a continuation of FIG. 4A showing spreading code assignment in the case of 32 users in the embodiment shown in FIGS. FIG. 4B is a continuation of FIG. 4B showing spreading code assignment in the case of 32 users in the embodiment shown in FIGS. FIG. 3 is a diagram showing spreading code assignment in the case of 16 users in the embodiment shown in FIGS. 1 and 2. FIG. 5A is a continuation of FIG. 5A showing spreading code assignment in the case of 16 users in the embodiment shown in FIGS. FIG. 5B is a continuation of FIG. 5B showing spreading code assignment in the case of 16 users in the embodiment shown in FIGS. FIG. 3 is a diagram showing spreading code assignment in the case of 8 users in the embodiment shown in FIGS. 1 and 2. FIG. 6A is a continuation of FIG. 6A showing spreading code assignment in the case of the number of users of 8 in the embodiment shown in FIGS. FIG. 6B is a continuation of FIG. 6B showing spreading code assignment in the case of the number of users of 8 in the embodiment shown in FIGS. FIG. 3 is a diagram showing spreading code allocation in the case where the number of users is 4 in the embodiment shown in FIGS. 1 and 2. FIG. 7A is a continuation of FIG. 7A showing spreading code assignment in the case of the number of users of 4 in the embodiment shown in FIGS. FIG. 7B is a continuation of FIG. 7B showing spreading code assignment in the case of the number of users of 4 in the embodiment shown in FIGS. FIG. 3 is a diagram showing spreading code assignment in the case of 2 users in the embodiment shown in FIGS. 1 and 2. FIG. 8A is a continuation of FIG. 8A showing spreading code assignment in the case of the number of users 2 in the embodiment shown in FIGS. FIG. 8B is a continuation of FIG. 8B showing spreading code assignment in the case of the number of users 2 in the embodiment shown in FIGS.

  Embodiments of a communication system according to the present invention will now be described in detail with reference to the accompanying drawings. The communication system 90 of the present embodiment includes a management device 30 as shown in FIG. 2, for example, which includes a plurality of communication devices (only 10, 60, 70 and 80 are shown in the figure). Continuously monitor the communication status, detect the communication status of each communication device, and effectively control the assignment and combination of spreading codes to each communication device 10, 60, 70 and 80 according to the communication status, spreading code Is a communication device that notifies each communication device 10, 60, 70, and 80 of the spread information.

  These communication devices 10, 60, 70 and 80 may have substantially the same configuration in this embodiment, and therefore, the communication device 10 is typically shown in FIG. When transmitting data, the communication device 10 modulates the data to be transmitted generated by the data generation unit 12 by the modulation unit 14 and is supplied from the spreading code table management unit 28 by the spreading unit 16 This is a device that performs spreading processing using a set and further transmits via an RF (Radio Frequency) signal transmission unit 18. The communication device 10 also receives the data received by the RF signal receiving unit 20 when receiving the data using the predetermined spreading code set supplied from the spreading code table management unit 28 by the despreading unit 22. Is despread, and demodulated by the demodulator 24 and supplied to the data processor 26. The spreading code table management unit 28 selects a spreading code table according to the spreading rate, the number of users, and the user number notified from the management device 30, and supplies the spreading code set to the spreading unit 18 and the despreading unit 22. Note that portions not directly related to understanding the present invention are not shown and redundant description is avoided.

  In the communication system 90, as shown in FIG. 2, the communication devices 10, 60, 70, and 80 are connected to and communicate with a network, and the management device 30 manages these communication devices 10, 60, 70, and 80. Although not shown here, a base station may exist between the management device 30 and each of the communication devices 10, 60, 70, and 80. The communication system 90 can also be applied to a traffic information providing system such as inter-vehicle communication and road-to-vehicle communication.

  The communication devices 10, 60, 70 and 80 are also in communication with the management device 30. Further, the communication system 90 may use different frequencies for transmission from the management apparatus 30 to the communication apparatus 10 and transmission from the communication apparatus 10 to the management apparatus 30. In addition, transmission from the management device 30 to the communication device 10 may use a specific spreading code, or broadcast to a plurality of communication devices 10, 60, 70 and 80 without performing spreading code separation. Also good.

  The management device 30 is a station device that manages a spreading code assigned to each communication device 10, 60, 70, and 80, and notifies each communication device 10, 60, 70, and 80 of spreading information related to this spreading code. . The spreading code may be a code sequence that spreads the data sequence to be transmitted by multiplying the data sequence to be transmitted.

  The number of spreading codes managed by the management apparatus 30 is determined in advance assuming the possible number of users in the system 90. In the present embodiment, the number of spreading codes managed by the management device 30 is referred to as a spreading factor. The system 90 can determine a spreading code table assuming various spreading factors, and each communication device 10, 60, 70 and 80 has a spreading code and a communication device for each spreading factor. A spreading code table indicating the relationship is stored.

  Further, the management device 30 can generate a diffusion status according to the communication status between the network and the communication device 10, and can also record this communication status. For example, the management device 30 records a communication log such as connection and disconnection between the communication device 10 and the communication network as a communication status.

  The management device 30 of the present embodiment includes a user number monitoring unit 40, and the user number monitoring unit 40 constantly monitors each of the communication devices 10, 60, 70, and 80, so that each communication device 10, 60, The communication status of 70 and 80 can be detected. The number-of-users monitoring unit 40 is connected to the communication network with reference to a table in which communication logs such as connection and disconnection between the communication devices 10, 60, 70 and 80 and the communication network are recorded, for example. It may be one that detects the number of communication devices. In this embodiment, communication devices in such a connection state are referred to as users, and the number of communication devices in a connection state is referred to as the number of users.

  The management device 30 assigns at least one spreading code to each of the communication devices 10, 60, 70 and 80 according to the number of users. The management device 30 assigns in the form of a user number that identifies the assignment of the spreading code for each communication device 10, 60, 70 and 80. In addition, when the number of users increases or decreases, the management device 30 can also update the user number for each user and reassign the spreading code as necessary.

  Further, the management device 30 manages the number of users and the communication devices 10, 60, 70, and 80 based on the communication status of the communication devices 10, 60, 70, and 80 detected by the user number monitoring unit 40. Each of the communication devices 10 and 60 in a connected state is generated for each communication device by generating spreading information including a user number indicating a spreading code assigned by 30 and a spreading factor indicating the number of spreading codes managed by the management device 30. , Notify 70 and 80.

  The communication device 10 according to the present embodiment has an application or a function unit that generates and processes communicable data, and performs communication, that is, transmission / reception of the data. For example, a mobile phone terminal, a GPS device, and a wireless device It may be a lower-level device that is mounted on or connected to a communication device such as a LAN terminal and executes data communication. The apparatus 10 can transmit, for example, narrowband signal data.

  The communication device 10 enables data transmission to other communication devices and data reception from other communication devices. The other communication devices may be the same as the communication device 10 or have different configurations. It may be a thing.

  In the present embodiment, in particular, the communication device 10 selects a spreading code table according to the spreading rate included in the spreading information notified from the management device 30, and the number of users and the user number included in the spreading information. Accordingly, a spreading code set is generated, and spreading processing and despreading processing are performed using spreading code sets 106 and 116, respectively. Although not shown in FIG. 1, the communication device 10 has a recording medium such as a memory and stores a spreading code table in advance. In the spreading code table, a spreading code set for each user in the communication system 90 is listed, and the spreading code set indicates data or information for each user used for spreading and despreading. The combination of the data string before spreading and the data string after spreading is shown.

  The communication device 10 has a spreading code table determined by the communication system 90 as shown in FIGS. 3A to 3C. This is a combination of a user number, a spreading code, a data string before spreading, and a data string after spreading. This is an enumerated data list and is provided in common with other communication devices. A spreading code table is also provided for each of various spreading factors. Further, the spreading code table stored in the communication device 10 may list only spreading codes.In this case, a table indicating a combination of a user number, a data string before spreading, and a data string after spreading, For example, when spread information is notified from the management device 30 to the communication device 10, the communication device 10 may create the spread information according to the spread information.

  In this embodiment, the data generator 12 generates data 102 to be transmitted, and supplies the generated transmission data 102 to the modulator 14. For example, the data generation unit 12 may receive a data generation request from an application or function unit that generates transmission data, and generate data in response to the request.

  The modulation unit 14 modulates the transmission data 102 supplied from the data generation unit 12 and supplies the modulation data 104 to the spreading unit 16. For example, the modulation unit 14 may modulate the transmission data 102 by a predetermined modulation method to generate the modulation data 104 of the symbol sequence, and may use a normal modulation method.

  The spreading unit 16 performs spreading processing on the modulated data 104 from the modulating unit 14 using a predetermined spreading code set 106, and supplies spread data 108 as a result of the processing to the RF signal transmitting unit 18. The spreader 16 may be a wideband signal by performing spread spectrum modulation processing such as CDMA on the modulation data 104, which is a narrowband signal, and responds to a spread code faster than the information transmission rate. The spread data 108 of the chip sequence may be generated from the modulation data 104 of the symbol sequence by performing the spreading process.

  In the present embodiment, the spreading unit 16 is supplied with a predetermined spreading code set 106 from the spreading code table management unit 28, and in particular with a spreading code set including a spreading code assigned to the communication device 10. When the supplied spreading code set 106 includes a plurality of spreading codes, the spreading unit 16 can also perform spreading processing on the modulation data 104 having the number of digits corresponding to the number of spreading codes in parallel. For example, the spreading code 16 may be instructed by the spreading code table management unit 28 for the spreading code set 106 used for spreading processing for each symbol string 104 to be spread.

  The RF signal transmitter 18 receives the spread data 108 from the spreader 16, converts it into a transmission data signal 110, and transmits it to the outside of the apparatus 10. For example, the RF signal transmission unit can generate a radio wave transmission data signal 110 from the spread data 108 of the chip array and transmit it to another communication device via the network.

  The RF signal receiving unit 20 supplies the reception data signal 112 of the apparatus 10 to the despreading unit 22. For example, the RF signal receiving unit 20 can receive a radio wave reception data signal 112 from another communication device via a network and convert the reception data signal 112 into reception data 114 of a chip sequence.

  The despreading unit 22 is instructed by the spreading code table management unit 28 to specify a predetermined spreading code set 116, and performs despreading processing on the received data 114 supplied from the RF signal receiving unit 20 using the spreading code set 116. The despread data 118 is supplied to the demodulator 24.

  The despreading unit 22 of the present embodiment may, for example, despread the received data 114 of the chip sequence one symbol sequence at a time to obtain the despread data 118 of the symbol sequence. For each symbol sequence to be despread, A spreading code set 116 can be input.

  For example, the despreading unit 22 sequentially inputs the spreading code set 116 of each user in the spreading code table from the spreading code table management unit 28, and performs despreading processing on the received data 114 using each spreading code set 116. The spreading code set 116 with the highest correlation is recognized as the spreading code set 116 related to the user who transmitted the data 114, and the spreading code set 116 demodulates the despread data 118 of the symbol sequence after despreading. Can be passed to part 24.

  The demodulator 24 demodulates the despread data 118 supplied from the despreader 22, and supplies the demodulated data 120 to the data processor 26. For example, the demodulator 24 may demodulate the despread data 118 of the symbol sequence by a predetermined method, and may use a normal demodulation method.

  The received data processing unit 26 processes received data. In this embodiment, the received data processing unit 26 can supply the demodulated data 120 supplied from the demodulating unit 24 to, for example, an application or function unit that processes received data. .

  The spreading code table management unit 28 is stored in advance in the recording medium of the communication device 10 according to the spreading factor of the management device 30 included in the spreading information notified from the management device 30 to the device 10. An appropriate table is selected from a plurality of spreading code tables. Further, a spreading code, a pre-spreading data string, and a spreading code selected from the spreading code tables selected according to the number of users and the user number included in the spreading information, And spreading code sets 106 and 116 in which the correspondence of the spread data string is shown.

  Further, the spreading code table management unit 28 supplies spreading code sets 106 and 116 to the spreading unit 16 and the despreading unit 22, respectively. Further, the spreading code table management unit 28 may supply the spreading code table itself selected as the spreading code set 116 to the despreading unit 22.

  Next, the spreading code set supplied from the spreading code table management unit 28 to the spreading unit 16 and the despreading unit 22 will be described.

  In this system 90, when the number of communication devices connected to m spreading codes managed by the management device 30 is n, the management device 30 does not exceed the maximum m / n. Codes can be assigned to other communication devices so as not to overlap.

  3A to 8C show correspondence tables of spreading code assignments according to the number of users, data strings before spreading, and data strings after spreading. In the tables shown in FIGS. 3A to 8C, for the sake of convenience of explanation, all the spreading factors of the devices managed by the management device 30 are 64, but the value of the spreading factor is not limited to this. 3A to 8C show examples of spreading code tables when the number of users is 64, 32, 16, 8, 4, and 2, respectively.

  In the present system 90, when the spreading code table shown in FIGS. 3A to 3C is used, the spreading factor is 64 times and the number of users is 64, so one spreading code set 106 is transferred to another communication device. One spreading code is assigned so as not to overlap. 3A to 3C, each user's spreading code set 106 corresponds to each row of spreading codes.

Here, the spreading code set 106 using one spreading code is a value for converting transmission data,
(First code) x (+1)
(First code) x (-1)
It has two values.

  The spreading unit 16 can spread binary transmission data, for example, 0 or 1 transmission data, using these post-spread data strings, that is, when the pre-spread data is 0, It can be converted into a data string multiplied by -1, and in the case of 1, it can be converted into a data string obtained by multiplying the spreading code by +1 for spreading processing. Further, the code to be multiplied may be reversed. For example, when the data before spreading is 0, the spreading code may be multiplied by +1, and when the data is 1, the spreading code may be multiplied by -1.

  Next, in the present system 90, when the spreading code tables shown in FIGS. 4A to 4C are used, since 64 spreading codes can be used by 32 users, another communication is performed with respect to one spreading code set 106. Two spreading codes are assigned so as not to overlap each other. For example, as shown in FIGS. 4A to 4C, code 1 and code 2 can be assigned to user 1, and code 3 and code 4 can be assigned to user 2.

Here, a spreading code set 106 using two spreading codes is a value for converting transmission data,
(First code) x (+1)
(First code) x (-1)
(Second code) x (+1)
(Second code) x (-1)
It has four values. Therefore, data having twice as many digits as the number of users of 64 can be diffused. In addition, each spreading code table may be created by previously determining a conversion pattern between a data string before spreading and a data string after spreading for each user. For example, before spreading of a quaternary value represented by a binary number, For each of the data strings “00”, “01”, “10”, and “11”, each spread data string (first code) × (+1), (first code) × (− 1), (second code) × (+1) and (second code) × (−1) may be determined in combination.

  Furthermore, in the present system 90, when the spreading code tables shown in FIGS. 5A to 5C are used, 64 spreading codes can be used by 16 users, so that another spreading device can be used for one spreading code set 106. Four spreading codes are assigned so as not to overlap each other.

  For example, as shown in FIGS. 5A to 5C, code 1, code 2, code 3 and code 4 are assigned to user 1, and code 5, code 6, code 7 and code 8 are assigned to user 2.

Here, the spreading code set 106 using four spreading code sets uses four codes as values for converting transmission data,
(First code) x (+1)
(First code) x (-1)
(Second code) x (+1)
(Second code) x (-1)
(Third code) x (+1)
(Third code) x (-1)
(Fourth code) x (+1)
(Fourth code) x (-1)
It has 8 values. Therefore, it is possible to spread four times as many data as the number of users is 64. Further, the conversion between the data string before spreading and the data string after spreading may be determined in advance for each user and each spreading code table may be generated. For example, before the spreading of the four values represented by binary numbers For each of the data strings “000”, “001”, “010”, “011”, “100”, “101”, “110” and “111”, the data string after diffusion (first code) × (+1), (first code) × (−1), (second code) × (+1), (second code) × (−1), (third code) X (+1), (third code) × (−1), (fourth code) × (+1) and (fourth code) × (−1) may be determined in combination. Good.

  Further, in the case where the number of users is 8 (FIGS. 6A to C), the case of 4 users (FIGS. 7A to C), and the case of 2 users (FIGS. 8A to C), the connection status of the communication apparatus 10 is similarly determined. Accordingly, a plurality of spreading codes can be assigned.

  Next, an operation example of the communication system in the present embodiment will be described.

  In the communication system 90, in the management device 30, when the user number monitoring unit 40 detects the number of users from the connection status with the communication network of the plurality of communication devices 10, 60, 70, and 80, the management device 30 Spreading information including the user number indicating the spreading code assignment and the spreading rate of the management device 30 is generated and notified to each communication device 10, 60, 70 and 80.

  The communication device 10 generates a spreading code set from the spreading code table based on the spreading information notified from the management device 30, and spreads or reverses the data transmitted or received according to the spreading code set. Perform diffusion processing.

  Next, an operation example of data transmission of the communication device 10 in the present embodiment will be described.

  In the apparatus 10, when the application or function unit operates to instruct transmission of communication data, the data generation unit 12 generates transmission data 102 corresponding to a request from the application. The transmission data 102 is modulated by the modulation unit 14 and supplied to the spreading unit 16 as modulation data 104.

  By the way, the spreading code table management unit 28 selects a spreading code table based on the spreading factor included in the spreading information notified from the management unit 30, and is included in the spreading information from the selected spreading code table. A spreading code set 106 is generated based on the number of users, and this spreading code set 106 is supplied to the spreading unit 16.

  Next, in the spreading unit 16, the modulation data 104 supplied from the modulation unit 14 is spread for each symbol string. At this time, the spreading code used in the spreading process is supplied for each symbol string based on the spreading code set 106 generated by the spreading code table management unit 28.

  The spread data 108 spread by the spreader 16 in this way is supplied to the RF signal transmitter 18 for each chip row. The RF signal transmission unit 18 generates radio wave transmission data 110 in accordance with the spread data 108 and transmits it via the network.

  Next, an example of data reception operation of the communication device 10 in the present embodiment will be described.

  In the device 10, when the application or function unit operates and senses that data is transmitted from another communication device to the device 10 via the network, the data signal 112 is received by the RF signal receiving unit 20. Received. The reception data signal 112 is converted into reception data 114 of a chip sequence by the RF signal reception unit 20 and supplied to the despreading unit 22.

  By the way, the spreading code table management unit 28 selects a spreading code table according to the spreading rate of the management device 30 included in the spreading information notified from the management device 30, and further includes the spreading code table from the spreading code table. Based on the number of users, the spreading code set 116 for each user is generated and supplied to the despreading unit 22.

  In the despreading unit 22, when the reception data 114 is supplied, the despreading process is performed according to the spreading code set 116 from the spreading code table management unit 28. The spreading code used for the despreading process of the received data When the set 116 has not been determined, the spreading code set 116 of each user in the spreading code table is sequentially input, and the correspondence between each spreading code set 116 and the received data 114 is determined. For example, the despreading unit 22 performs despreading processing on each received data 114, and after despreading, determines the correspondence by correlation, and inputs the spreading code set 116 when the correlation is the highest, and performs despreading processing I do.

  Further, the despread data 120 processed by the despreading unit 22 is supplied to the demodulation unit 24 and demodulated into the demodulated data 120 in accordance with a predetermined demodulation. The demodulated data 120 is supplied to the data processing unit 26 and processed by a predetermined application or function unit.

10, 60, 70, 80 Communication device
12 Data generator
14 Modulator
16 Diffusion part
18 RF signal transmitter
20 RF signal receiver
22 Despreading section
24 Demodulator
26 Data processing section
28 Spreading code table manager
30 Management device
40 Number of users monitoring section
90 Communication system

Claims (21)

In a communication system including a plurality of communication devices that perform communication via a communication network, and a management device that assigns a spreading code used for communication to each of the plurality of communication devices,
The management device includes a communication status monitoring unit that detects a communication status of the plurality of communication devices;
Spreading that determines the spreading code to be assigned to the plurality of communication devices in the connected state according to the detected communication status, and notifies the plurality of communication devices in the connected state of spreading information related to the assignment of the spreading code Code allocation means,
The communication device
Having at least one or more spreading code tables indicating the relationship between the communication device and the spreading code in advance;
Spreading processing means for performing spreading processing on the data transmitted by the communication device using the spreading code;
Despreading processing means for performing despreading processing on the data received by the communication device using the spreading code;
Selecting the spreading code table according to the spreading information, generating a spreading code set indicating information for each communication device used for spreading processing and despreading processing based on the spreading code table; And spreading code table management means for supplying to the despreading processing means,
The spreading processing means performs the spreading processing using the spreading code set,
The despreading processing unit performs the despreading process using the spreading code set.   The communication system according to claim 1, wherein the communication status is the number of communication devices in the connected state, that is, the number of users.   3. The communication system according to claim 2, wherein the spreading code assigning unit updates a user number according to a spreading factor of the management device and the number of users, assigns the spreading code for each user, and assigns the spreading code to the communication device. A communication system characterized by notifying.   4. The communication system according to claim 3, wherein the spreading information includes the spreading factor, the number of users, and a user number.   5. The communication system according to claim 4, wherein the spreading code table management unit selects the spreading code table according to the spreading factor, and selects according to the number of users and the user number assigned to the communication device. A communication system, wherein the spreading code set is generated from the table and supplied to the spreading processing means. 5. The communication system according to claim 4, wherein the spreading code table management unit selects the spreading code table according to the spreading factor and generates the spreading code set from the spreading code table according to the number of users. To the diffusion processing means and the despreading processing means,
The despreading processing unit performs the despreading process using the spreading code set included in the selected spreading code table, detects a correlation, and has the highest correlation among the spreading code sets. A communication system characterized by detecting a spreading code set capable of detecting a spreading code set suitable for despreading processing of the received data. In a communication system including a plurality of communication devices that transmit data via a communication network, and a management device that assigns a spreading code used for transmission to each of the plurality of communication devices,
The management device includes a communication status monitoring unit that detects a communication status of the plurality of communication devices;
Spreading that determines the spreading code to be assigned to the plurality of communication devices in the connected state according to the detected communication status and notifies the plurality of communication devices in the connected state of spreading information related to the assignment of the spreading code Code allocation means,
The communication device
Having at least one or more spreading code tables indicating the relationship between the communication device and the spreading code in advance;
Spreading processing means for performing spreading processing on the data transmitted by the communication device using the spreading code;
Spreading that selects the spreading code table according to the spreading information, generates a spreading code set indicating information for each communication device used for spreading processing based on the spreading code table, and supplies the spreading code set to the spreading processing means Code table management means,
The said spreading | diffusion processing means performs the said spreading | diffusion process using the said spreading code set, The communication system characterized by the above-mentioned. In a communication system including a plurality of communication devices that receive data via a communication network, and a management device that assigns a spreading code used for reception to each of the plurality of communication devices,
The management device includes a communication status monitoring unit that detects a communication status of the plurality of communication devices;
Spreading that determines the spreading code to be assigned to the plurality of communication devices in the connected state according to the detected communication status and notifies the plurality of communication devices in the connected state of spreading information related to the assignment of the spreading code Code allocation means,
The communication device
Having at least one or more spreading code tables indicating the relationship between the communication device and the spreading code in advance;
Despreading processing means for performing despreading processing on the data received by the communication device using the spreading code;
The spreading code table is selected according to the spreading information, and based on the spreading code table, a spreading code set indicating information for each communication device used for despreading processing is generated and supplied to the despreading processing means. Spreading code table management means,
The despreading processing unit performs the despreading process using the spreading code set. Spreading processing means connected to a communication system including a management device for managing the spreading code, assigned the spreading code by the management device according to the communication status, and performing spreading processing on the data to be transmitted using the spreading code And a despreading processing unit that performs despreading processing on the received data using the spreading code, and communicates with other communication devices via a communication network, the device includes:
A plurality of spreading code tables indicating the relationship between the spreading code and the communication device;
Receiving spreading information related to the assigned spreading code, selecting the spreading code table according to the spreading information, and obtaining information for each communication device used for spreading and despreading based on the spreading code table; A spreading code table management means for generating a spreading code set to be supplied and supplying the spreading code set to the spreading processing means and the despreading processing means,
The spreading processing means performs the spreading processing using the spreading code set,
The despreading processing unit performs the despreading process using the spreading code set.   The communication apparatus according to claim 9, wherein the spreading information includes a spreading rate, the number of users, and a user number of the management apparatus.   The communication apparatus according to claim 10, wherein the spreading code table managing unit selects the spreading code table according to the spreading factor, generates the spreading code set according to the number of users and a user number, and A communication apparatus, characterized by being supplied to a diffusion processing means and a despreading processing means. 11. The communication apparatus according to claim 10, wherein the spreading code table managing unit selects the spreading code table according to the spreading factor, generates the spreading code set according to the number of users, and generates the spreading code set. Supplying to the despreading means;
The despreading processing unit performs despreading processing using a spreading code set included in the spreading code table management unit, detects a correlation, and can detect the despreading data having the highest correlation among the spreading code sets. A communication apparatus that detects a spreading code set as a spreading code set suitable for despreading processing of the received data.   12. The communication apparatus according to claim 11, wherein the spreading processing unit performs spreading processing on the plurality of transmission data in parallel using the plurality of spreading codes included in the generated spreading code set. A communication device. Spreading processing means connected to a communication system including a management device for managing the spreading code, assigned the spreading code by the management device according to the communication status, and performing spreading processing on the data to be transmitted using the spreading code A communication device that transmits data to another communication device via a communication network, the device includes:
A plurality of spreading code tables indicating the relationship between the spreading code and the transmission device;
Receiving spreading information relating to the assigned spreading code, selecting the spreading code table according to the spreading information, and spreading code indicating information for each communication device used for spreading based on the spreading code table A spreading code table management means for generating a set and supplying the set to the spreading processing means,
The communication apparatus characterized in that the spread processing means performs the spread processing using the spread code set. Despreading connected to a communication system including a management device that manages a spreading code, assigned the spreading code by the management device according to the communication status, and performing despreading processing on the received data using the spreading code A communication device that receives data from another communication device via a communication network, the device comprising:
A plurality of spreading code tables indicating the relationship between the spreading code and the receiving device in advance;
Spreading information indicating the information for each receiving device used for despreading is received based on the spreading code table by receiving spreading information on the assigned spreading code, selecting the spreading code table according to the spreading information. A spreading code table management means for generating a code set and supplying the code set to the despreading processing means,
The despreading processing unit performs the despreading process using the spreading code set. A spread code is managed by a management apparatus of a communication system including a plurality of communication apparatuses, the spread code is assigned by the management apparatus according to a communication situation, and spread processing is performed on the data to be transmitted using the spread code. In a communication method, comprising: a spreading process step; and a despreading process step for performing a despreading process on the received data using the spreading code, wherein the communication method communicates with a plurality of communication devices via a communication network. ,
Utilizing a plurality of spreading code tables indicating the relationship between the spreading code that the communication device has in advance and the communication device,
The communication device receives spreading information related to the assigned spreading code from the management device, selects the spreading code table according to the spreading information, and is used for spreading and despreading based on the spreading code table. A spreading code table management step for generating a spreading code set indicating information for each communication device and supplying the spreading code set to the spreading processing step and the despreading processing step,
The spreading process step performs the spreading process using the spreading code set,
The despreading process step performs the despreading process using the spreading code set.   17. The communication method according to claim 16, wherein the spreading information includes a spreading factor, the number of users, and a user number of the management device.   18. The communication method according to claim 17, wherein the spreading code table management step selects the spreading code table according to the spreading factor, generates the spreading code set according to the number of users and a user number, and A communication method comprising: supplying a diffusion processing step and a despreading processing step. 19. The communication method according to claim 18, wherein the spreading code table managing step selects the spreading code table according to the spreading factor, generates the spreading code set according to the number of users, and performs the spreading processing step. And supply to the de-diffusion process,
The despreading process step performs the despreading process using the spreading code set included in the spreading code table management step, detects a correlation, and detects the despread data having the highest correlation among the spreading code sets. A communication method, comprising: detecting a spread code set that can be used as a spread code set suitable for despreading processing of the received data.   The communication method according to claim 19, wherein the spreading process step performs the spreading process on a plurality of transmission data in parallel using a plurality of spreading codes included in the generated spreading code set. Communication method. In a communication program installed in each of a plurality of communication devices that are connected to a management device that manages a spreading code and performs communication using the spreading code assigned by the management device according to the communication status, the program is: ,
Utilizing a plurality of spreading code tables indicating the relationship between the spreading code that the communication device has in advance and the communication device,
A spreading process step of spreading the data transmitted by the communication device using the spreading code;
A despreading process for performing despreading processing on the data received by the communication device using the spreading code;
The communication device receives spreading information related to the assigned spreading code from the management device, selects the spreading code table according to the spreading information, and is used for spreading and despreading based on the spreading code table A spreading code table management step for generating a spreading code set indicating information for each communication device and supplying the spreading code set to the spreading processing step and the despreading processing step,
The spreading process step performs the spreading process using the spreading code set,
The despreading process step performs the despreading process using the spreading code set.

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