US20080045204A1 - Communication network control system, radio communication appartus, and communication network control method - Google Patents

Communication network control system, radio communication appartus, and communication network control method Download PDF

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Publication number
US20080045204A1
US20080045204A1 US11/755,255 US75525507A US2008045204A1 US 20080045204 A1 US20080045204 A1 US 20080045204A1 US 75525507 A US75525507 A US 75525507A US 2008045204 A1 US2008045204 A1 US 2008045204A1
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Prior art keywords
communication
base station
radio
restriction signal
radio base
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US11/755,255
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English (en)
Inventor
Yusuke Takano
Toshiyuki Tamura
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NEC Corp
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NEC Corp
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Assigned to NEC CORPORATION reassignment NEC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TAKANO, YUSUKE, TAMURA, TOSHIYUKI
Publication of US20080045204A1 publication Critical patent/US20080045204A1/en
Priority to US12/886,867 priority Critical patent/US8787166B2/en
Priority to US13/861,811 priority patent/US8929884B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H04W48/06—Access restriction performed under specific conditions based on traffic conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information

Definitions

  • the present invention relates to a communication network control system, a radio communication apparatus used in the system, a communication network control method, and a radio base station.
  • the number of subscribers of cellular phones has increased yearly and recently exceeded 90 million. That is, about 2 ⁇ 3 the population of Japan possess cellular phone sets.
  • the communication network resources are finite, and many cellular phone owners simultaneously communicate in a densely populated area, a disaster area, or the like, in particular. This may cause congestion in the communication network.
  • Patent Document 1 discloses a digital car phone system which increases the number of channels at the time of traffic congestion in a radio base station.
  • a radio base station upon detecting traffic congestion, a radio base station transmits a half rate request signal to a car phone terminal.
  • the car phone terminal Upon receiving the half rate request signal, the car phone terminal starts half-rate communication through the radio base station.
  • Patent Document 2 discloses a method of performing congestion control in radio communication. According to this method, a base station calculates the traffic amount of a radio channel by detecting the communication schemes used by terminals under communication and the number of terminals. The base station then imposes call limitation on terminals on the basis of the communication scheme used by the terminals under communication, the number of terminals, and the calculated traffic amount.
  • Patent Document 3 discloses a congestion control system in radio access.
  • a terminal upon detecting congestion, a terminal notifies a radio base station of the corresponding information.
  • the radio base station Upon receiving the congestion notification, the radio base station instructs a transcoder to suppress the bit rate of a speech CODEC (Coder/Decoder), thereby canceling the congestion state.
  • a speech CODEC Coder/Decoder
  • An exemplary object is that the present invention can provide a radio communication apparatus (e.g., a cellular phone set) which allows speech communication at the time of communication network congestion by using a proper speech outgoing/incoming scheme. More specifically, there is provided a communication network control system which allows speech communication under deterioration in sound quality to a minimum necessary level by causing a radio communication apparatus to automatically select a proper domain, speech communication scheme, or CODEC in accordance with a congestion state from a radio base station.
  • CODEC indicates a device or software for conversion of data, e.g., compression or decompression of data.
  • a radio communication apparatus of the present invention comprises an antenna which receives a restriction signal from a radio base station, a reception circuit which decodes the restriction signal received by the antenna, and a control circuit which controls the radio communication apparatus, wherein the control circuit can select appropriately a speech outgoing/incoming scheme for performing communication with the radio base station on the basis of the restriction signal from the radio base station.
  • a communication network control system which allows proper speech communication even at the time of communication network congestion, a radio communication apparatus used in the system, a communication network control method, and a radio base station.
  • FIG. 1 is a schematic view showing the arrangement of a communication network control system according to the first exemplary embodiment of the present invention
  • FIG. 2 is a schematic view showing the arrangement of a radio base station in the communication network control system according to the first exemplary embodiment of the present invention
  • FIG. 3 is a schematic view showing the arrangement of a radio communication apparatus in the communication network control system according to the first exemplary embodiment of the present invention
  • FIG. 4 is a view for explaining the operation of the communication network control system according to the first exemplary embodiment of the present invention.
  • FIG. 5 is a flowchart showing a method of making the control circuit of the communication network control system according to the first exemplary embodiment of the present invention select a speech outgoing/incoming scheme
  • FIG. 6 is a schematic view showing the arrangement of a communication network control system according to the second exemplary embodiment of the present invention.
  • the first exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 5 .
  • FIG. 1 shows the arrangement of a communication network control system of 2 nd Generation or 3 rd Generation according to the first exemplary embodiment.
  • the communication network control system according to the first exemplary embodiment comprises radio communication apparatuses 100 A and 100 B, radio base stations 200 A and 200 B, and a relay station 300 .
  • reference symbols A and B denote radio cover areas of the radio base stations 200 A and 200 B.
  • FIG. 2 shows the arrangement of the radio base station 200 A.
  • the radio base station 200 A comprises a transmission/reception circuit 210 , control circuit 220 , congestion monitoring circuit 230 , and antenna 240 .
  • the radio base station 200 A can be a communication apparatus which can transmit/receive radio signals to/from a radio communication apparatus, e.g., an AP (Access Point) in a wireless LAN system or a base station in a cellular phone system. Since the radio base station 200 B may have the same arrangement as that of the radio base station 200 A, the arrangement of the radio base station 200 A will be described here.
  • AP Access Point
  • the transmission/reception circuit 210 performs necessary processing for a restriction signal input from the control circuit 220 , and transmits the resultant signal to the radio communication apparatus 100 A through an antenna.
  • the transmission/reception circuit 210 performs necessary processing (e.g., modulation, encoding, or A/D conversion) for data received from the radio base station 200 A, and outputs the resultant data to the control circuit 220 .
  • the transmission/reception circuit 210 also performs necessary processing (e.g., demodulation, decoding, or D/A conversion) for data input from the control circuit 220 , and transmits the resultant data to the radio communication apparatus 100 A.
  • the control circuit 220 transmits information about the congestion state of a circuit domain or packet domain, a restriction ratio, or the like, which is input from the congestion monitoring circuit 230 , as a restriction signal to the radio communication apparatus 100 A.
  • the control circuit 220 transmits data received from the radio communication apparatus 100 A to the relay station 300 , and transmits data received from the relay station 300 to the radio communication apparatus 100 A.
  • the control circuit 220 can comprise, for example, a circuit including a CPU (Central Processing Unit), MPU (Micro Processing Unit), or the like as an arithmetic processing function.
  • the congestion monitoring circuit 230 monitors the congestion state of a circuit domain or packet domain, and outputs data about the congestion state and a restriction ratio to the control circuit 220 .
  • the antenna 240 transmits data input from the transmission/reception circuit 210 to the radio communication apparatus 100 A.
  • the antenna 240 outputs data received from the radio communication apparatus 100 A to the transmission/reception circuit 210 .
  • FIG. 3 shows the arrangement of the radio communication apparatus 100 A.
  • the radio communication apparatus 100 A comprises a transmission/reception circuit 110 , control circuit 120 , storage circuit 130 , interface circuit 140 , and antenna 150 .
  • the radio communication apparatus 100 A can be various communication apparatuses each having a function of communicating with a radio base station, e.g., a PC (Personal Computer), a wireless LAN (Local Area Network) apparatus, a cellular phone set, a fixed telephone set, a PHS (Personal Handy phone System), or a PDA (Personal Digital Assistant).
  • a radio base station e.g., a PC (Personal Computer), a wireless LAN (Local Area Network) apparatus, a cellular phone set, a fixed telephone set, a PHS (Personal Handy phone System), or a PDA (Personal Digital Assistant).
  • the radio communication apparatus 100 B may have the same arrangement as that of the radio communication apparatus 100 A, the arrangement of the radio communication apparatus 100 A will
  • the transmission/reception circuit 110 performs necessary processing (e.g., demodulation, decoding, or D/A conversion) for a restriction signal received from the radio base station 200 A through an antenna, and outputs the resultant signal to the control circuit 120 .
  • the transmission/reception circuit 110 performs necessary processing (e.g., modulation, encoding, or A/D conversion) for data input from the control circuit 120 , and transmits the resultant data to the radio base station 200 A through an antenna.
  • the control circuit 120 analyzes a restriction signal received from the radio base station 200 A and extracts information such as the congestion state of a circuit domain or packet domain, a restriction ratio, or the like.
  • the control circuit 120 selects a proper speech outgoing/incoming scheme for the radio communication apparatus 100 A in accordance with each kind of information extracted by analysis.
  • a speech outgoing/incoming scheme indicates a domain, a speech communication scheme, or a CODEC.
  • the control circuit 120 performs communication by using the automatically selected proper speech communication scheme, domain, or CODEC.
  • the speech communication schemes include, for example, a full duplex communication scheme used for general speech communication, IMS (Internet Protocol Multimedia Subsystems) which performs full duplex communication on a packet communication network, and a PoC communication scheme (Push to talk over Cellular) which performs half duplex communication on a packet communication network.
  • the CODECs include, for example, AMR (Advanced Multi Rate CODEC) 12.2, AMR 10.2, AMR 7.95, AMR 7.40, AMR 6.70, AMR 5.90, AMR 5.15, AMR 4.75, GSM (Global System for Mobile Communications) FR (Full Rate), and GSM HR (Half Rate).
  • control circuit 120 can comprise for example, a circuit including a CPU (Central Processing Unit), MPU (Micro Processing Unit), or the like as an arithmetic processing function.
  • CPU Central Processing Unit
  • MPU Micro Processing Unit
  • the storage circuit 130 stores a program associated with a speech communication scheme or a CODEC.
  • a CODEC may be implemented by a circuit provided for each type of CODEC instead of a program.
  • the storage circuit 130 stores, for example, a program which is necessary for the radio communication apparatus 100 A to operate, and a telephone directory holding personal information such as the names or telephone numbers of speech communication partners.
  • the storage circuit 130 can be one of various storage media having a function of storing data, e.g., a semiconductor memory and a hard disk.
  • the interface circuit 140 outputs, for example, data input by the user of the radio communication apparatus 100 A to the control circuit 120 .
  • the interface circuit 140 notifies the user of the radio communication apparatus 100 A of data input from the control circuit 120 .
  • the interface circuit 140 may be configured to notify the user of a change of setting for the speech communication scheme or CODEC through, for example, a window displaying images or text or sound.
  • the interface circuit 140 may be configured to set a speech outgoing/incoming scheme through, for example, a keyboard for inputting data, a window displaying images or text to the user, or a speaker which produces sound.
  • the interface circuit 140 can also notify the user, by using sound, text, or images, when the speech communication scheme automatically changes.
  • the antenna 150 transmits data input from the transmission/reception circuit 110 to the radio base station 200 A. In addition, the antenna 150 outputs data received from the radio base station 200 A to the transmission/reception circuit 110 .
  • the relay station 300 manages the radio base stations 200 A and 200 B.
  • the relay station 300 is, for example, an RNC (Radio Network Controller) or an MSC (Mobile Services Switching Center).
  • RNC Radio Network Controller
  • MSC Mobile Services Switching Center
  • the congestion monitoring circuit 230 of the radio base station 200 A calculates the congestion state of a circuit domain or packet domain or a restriction ratio, and outputs the congestion state, restriction ratio, or the like (which are sometimes generically called communication network information) to the control circuit 220 (S 501 ).
  • the control circuit 220 then transmits, to the radio communication apparatus 100 A, a restriction signal generated on the basis of the congestion state, restriction ratio, or the like input from the congestion monitoring circuit 230 (S 502 ).
  • the control circuit 220 measures a CPU usage rate in a given cycle, and determines congestion, upon consecutively observing X (X is a predetermined value) numerical values exceeding a threshold. Assume that A represents this determination.
  • the control circuit 220 measures the number of packets processed per unit time in advance. The control circuit 220 determines the maximum number of packets that can be processed per unit time at the nth measurement from the (n ⁇ 1)th and (n ⁇ 2)th measurements. When the number of packets exceeding the maximum number of packets that can be processed is received at the nth measurement, the control circuit 220 determines congestion. Assume that B represents this determination.
  • the restriction ratio calculation method will be described next. Assume that five restriction ratios are set stepwise as 0, 25, 50, 75, and 100%. In this case, at the time of the determination A, the restriction ratio is increased by two steps. At the time of the determination B, the restriction ratio is decreased by one step. If no congestion is determined the unit time after the restriction ratio is increased, the restriction is gradually cancelled by decreasing the restriction ratio by one step.
  • the control circuit 220 adjusts the restriction ratio in the above manner.
  • the control circuit 120 of the radio communication apparatus 100 A Upon receiving a restriction signal from the radio base station 200 A, the control circuit 120 of the radio communication apparatus 100 A analyzes the restriction signal to extract a congestion state, restriction ratio, or the like. The control circuit 120 then automatically selects a proper domain, speech communication scheme, or CODEC in accordance with the restriction ratio (S 503 ), and notifies the relay station 300 of the selected domain, speech communication scheme, or CODEC (S 504 ).
  • the control circuit 120 determines, on the basis of the congestion state of a circuit domain or packet domain or the restriction ratio extracted from the restriction signal, whether to permit the user to perform speech communication (S 601 ). If speech communication is not permitted, the user can perform text communication (S 602 ). If, for example, the restriction ratio becomes 50% or more in the standby state of the radio communication apparatus, the apparatus is set in the text communication mode. If, however, the restriction ratio becomes 50% or more during speech communication of the radio communication apparatus, it suffices to continue the speech communication.
  • a domain is selected on the basis of the congestion state of a circuit domain or packet domain, the restriction ratio, or the like (S 603 ). More specifically, the control circuit 120 selects, for example, a circuit domain or a packet domain which has a higher resource margin by comparing the congestion states of the domains with each other. The control circuit 120 then selects a speech communication scheme and a CODEC (S 604 and S 605 ). More specifically, for example, priorities are assigned to the speech communication schemes in advance. If priority is given to conversation, priority is given to full duplex communication. If priority is given to sound quality, priority is given to half duplex communication.
  • the control circuit 120 then calculates speech communication scheme (for example, 1 for general speech communication and 0.5 for PoC communication) ⁇ general rate (e.g., 12.2 if AMR 12.2 is the general rate). If priority is given to full duplex communication and the restriction ratio is 25%, the control circuit 120 performs calculation as follows:
  • control circuit 120 selects AMR 7.95 or less or GSM HR. If priority is given to half duplex communication and the restriction ratio is 25%, the control circuit 120 performs calculation as follows:
  • control circuit 120 can select all CODECs. With the above operation, a speech outgoing/incoming scheme is determined (S 606 ).
  • the relay station 300 transmits a notification received from the radio communication apparatus 100 A to the radio communication apparatus 100 B of the speech communication partner through the radio base station 200 B (S 505 ).
  • the radio communication apparatuses 100 A and 100 B then negotiate the selected CODEC and start speech communication (S 506 and S 508 ). If the relay station 300 needs to convert speech data, the radio communication apparatuses start speech communication after permission/inhibition of the selected CODEC is checked between the radio communication apparatus 100 A and the relay station 300 (S 507 and S 509 ).
  • Making the communication network control system of the first exemplary embodiment select a proper speech outgoing/incoming scheme by using a circuit domain or a packet domain makes it possible to perform communication even at the time of communication network congestion. More specifically, for example, this allows speech communication even at the time of a disaster, and hence makes it possible to check damage in a disaster area or the safety of disaster victims.
  • the radio communication apparatus 100 B of a speech communication partner can perform PoC communication even if it is not compatible with the communication network control system.
  • the partner can perform PoC communication by using the PoC system disclosed in Japanese Patent Application No. 2006-092297. Using this arrangement makes it possible to perform speech communication, with proper speech, even with a radio communication apparatus which does not have an arrangement capable of PoC communication, at the time of communication network congestion, thereby improving convenience.
  • the first exemplary embodiment takes the form in which the radio communication apparatus automatically selects a speech communication scheme or a CODEC.
  • the first exemplary embodiment may take a form of making the user select a speech communication scheme or CODEC for the radio communication apparatus through the interface circuit 140 , e.g., sound or a display window, instead of automatically selecting it.
  • the second exemplary embodiment of the present invention will be described next with reference to FIG. 6 .
  • the following is the difference between the second exemplary embodiment and the first exemplary embodiment.
  • the first exemplary embodiment has exemplified the communication through a radio base station in the communication network of the 2 nd Generation or 3 rd Generation.
  • the second exemplary embodiment will exemplify the operation of selecting one of communication through a radio base station and communication through a WLAN AP (Wireless Local Area Network Access Point).
  • WLAN AP Wireless Local Area Network Access Point
  • FIG. 6 shows the arrangement of a communication network control system according to the second exemplary embodiment.
  • the communication network control system according to the second exemplary embodiment comprises radio communication apparatuses 100 A and 100 B, radio base stations 200 A and 200 B, and WLAN APs 400 A and 400 B.
  • the radio communication apparatuses 100 A and 100 B and the radio base stations 200 A and 200 B use the same arrangements as those in the first exemplary embodiment.
  • a control circuit 120 of the radio communication apparatus 100 A receives a restriction signal from the radio base station 200 A, and extracts information of a restriction ratio or congestion state.
  • the control circuit 120 selects between performing communication through the radio base station 200 A and performing communication through the WLAN AP 400 A on the basis of the information of the restriction ratio or congestion state. If, for example, both the restriction ratios of a circuit domain and packet domain are 75% or more, the control circuit 120 selects communication through the WLAN AP 400 A.
  • the control circuit 120 selects a route connecting to the WLAN AP 400 B through a WLAN C or a route connecting to a packet domain in a communication network D of the 2 nd Generation or 3 rd Generation on the basis of the information of the restriction ratio or congestion state.
  • the radio communication apparatus 100 A communicates with the radio communication apparatus 100 B through the selected route.
  • the control circuit 120 performs the same operation as in the first exemplary embodiment (see FIG. 4 ).
  • the communication network control system can communicate even under communication network congestion both in a circuit domain and a packet domain by selecting communication through the WLAN AP.
  • the communication network control system increases the chance of communicating with disaster victims when checking a damage degree in a disaster area or the safety of disaster victims.
  • the second exemplary embodiment has exemplified the two choices, i.e., communication through a radio base station in the communication network D of the 2 nd Generation or 3 rd Generation and communication through a WLAN AP.
  • the second exemplary embodiment may be configured to select either communication through a radio base station in the communication network D of the 2 nd Generation or 3 rd Generation or communication through a radio base station in a WiMax (Worldwide Interoperability for Microwave Access) system.
  • the second exemplary embodiment may be configured to manually select communication through a radio base station, communication through a WLAN AP, or communication through a radio base station in a WiMax system.
  • the communication through the radio base station, the communication through the WLAN AP or the communication through the radio base station in the WiMax system may be manually selected through the interface circuit 140 instead of automatically selecting one of them.
  • a WLAN AP transmits no restriction signal.
  • the second exemplary embodiment may be configured to transmit a restriction signal from a WLAN AP or a radio base station in a WiMax system.
  • the second exemplary embodiment when communication through a WLAN AP is selected, a CODEC or a communication scheme is determined by initialization.
  • the second exemplary embodiment may be configured to receive a restriction signal from a WLAN AP upon selection of communication through the WLAN AP and select a communication scheme or a CODEC on the basis of the restriction signal. That is, in the second exemplary embodiment, for example, upon selecting communication through a WLAN AP, the control circuit 120 of the radio communication apparatus 100 A receives a restriction signal from the WLAN AP. The control circuit 120 then selects full duplex communication or half duplex communication on the basis of the restriction signal. Thereafter, the radio communication apparatus 100 A may select a code type and start communicating with the radio communication apparatus 100 B as a communication partner.
  • the second exemplary embodiment may be configured to manually select full duplex communication or half duplex communication through an interface circuit 140 instead of automatically selecting one of them.
  • the present invention has the following exemplary embodiments.
  • the radio communication apparatus it is characterized in that the selected speech outgoing/incoming scheme is a domain scheme.
  • the radio communication apparatus it is characterized in that the selected speech outgoing/incoming scheme is a speech communication scheme.
  • the radio communication apparatus it is characterized in that the selected speech outgoing/incoming scheme is a CODEC.
  • the restriction signal from the radio base station indicates communication network information in the radio base station.
  • the radio communication apparatus is characterized by further comprising an interface circuit which notifies a user of information or allows the user to input information, and a circuit which causes the user to select the speech communication scheme by using the interface circuit.
  • the radio communication apparatus it is characterized in that the speech outgoing/incoming scheme is automatically selected.
  • the radio communication apparatus is a portable terminal.
  • a communication network control system of the present invention comprises: a radio base station and a radio communication apparatus, in which the radio base station comprises a first antenna which transmits a restriction signal to the radio communication apparatus; a transmission circuit which encodes the restriction signal transmitted to the radio communication apparatus; and a first control circuit which generates the restriction signal, and the radio communication apparatus comprises a second antenna which receives the restriction signal from the radio base station; a reception circuit which decodes the restriction signal received by the antenna; and a second control circuit which controls the radio communication apparatus, wherein the second control circuit is configured to select a proper speech outgoing/incoming scheme for performing communication with the radio base station on the basis of the restriction signal received by the second antenna.
  • the selected speech outgoing/incoming scheme is a domain scheme.
  • the selected speech outgoing/incoming scheme is a speech communication scheme.
  • the selected speech outgoing/incoming scheme is a CODEC.
  • the restriction signal from the radio base station indicates communication network information in the radio base station.
  • the communication network control system is characterized by further comprising an interface circuit which notifies a user of information or allows the user to input information, and a circuit which causes the user to select the speech communication scheme by using the interface circuit.
  • the speech outgoing/incoming scheme is automatically selected.
  • the radio communication apparatus is a portable terminal.
  • the communication network control system it is characterized by further comprising a communication control apparatus which interconverts a communication control signal used in a telephone communication network and a communication control signal used in a PoC (Push-to-Talk over Cellular) system; and a speech signal processing apparatus which interconverts a full duplex speech signal used in the telephone communication network and a half duplex speech signal used in the PoC system.
  • a communication control apparatus which interconverts a communication control signal used in a telephone communication network and a communication control signal used in a PoC (Push-to-Talk over Cellular) system
  • a speech signal processing apparatus which interconverts a full duplex speech signal used in the telephone communication network and a half duplex speech signal used in the PoC system.
  • the system further comprises a radio base station, a relay station, a first radio communication apparatus, and a second radio communication apparatus, wherein the radio base station monitors a congestion state, calculates a restriction ratio, generates a restriction signal containing communication network information, and transmits the restriction signal to the first radio communication apparatus, and wherein the first radio communication apparatus extracts the communication network information from the received restriction signal, selects a domain on the basis of the congestion state or the restriction ratio, and communicates with the second radio communication apparatus through the relay station by negotiating a CODEC with the second radio communication apparatus.
  • a communication control method in the radio communication apparatus of the present invention comprises the steps of: receiving a restriction signal from the radio base station; decoding the received restriction signal; and selecting a domain for communication with the radio base station on the basis of the restriction signal.
  • the communication control method which further comprises the steps of: in the radio base station, transmitting a restriction signal to the radio communication apparatus; encoding the restriction signal transmitted to the radio communication apparatus; and generating the restriction signal, and in the radio communication apparatus, receiving the restriction signal from the radio base station; decoding the restriction signal; and selecting a domain for communication with the radio base station on the basis of the decoded restriction signal.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
US11/755,255 2006-06-29 2007-05-30 Communication network control system, radio communication appartus, and communication network control method Abandoned US20080045204A1 (en)

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US13/861,811 US8929884B2 (en) 2006-06-29 2013-04-12 Communication network control system, radio communication apparatus, and communication network control method

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JP2006179604A JP4779827B2 (ja) 2006-06-29 2006-06-29 ネットワーク制御システム、無線通信装置、及びネットワーク制御方法
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JP5953170B2 (ja) * 2012-08-01 2016-07-20 株式会社Ｎｔｃ 通信方法および通信システム
JP5953171B2 (ja) * 2012-08-01 2016-07-20 株式会社Ｎｔｃ 通信方法および通信システム
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