JP2009124463A - Radio communication device and method - Google Patents

Radio communication device and method Download PDF

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JP2009124463A
JP2009124463A JP2007296549A JP2007296549A JP2009124463A JP 2009124463 A JP2009124463 A JP 2009124463A JP 2007296549 A JP2007296549 A JP 2007296549A JP 2007296549 A JP2007296549 A JP 2007296549A JP 2009124463 A JP2009124463 A JP 2009124463A
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communication
frequency band
data communication
partner
data
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JP2007296549A
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JP5098586B2 (en
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Toru Kimura
木村  亨
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Nec Corp
日本電気株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks

Abstract

A wireless communication apparatus and a wireless communication method capable of realizing high-speed data communication with low power consumption and appropriately controlling a communication partner of data communication.
A first transmission / reception unit transmits / receives a signal using a carrier wave in a first frequency band. The second transmission / reception unit transmits / receives a signal using a carrier wave in a second frequency band different from the first frequency band. The control unit uses the first transmission / reception unit to transmit and receive a control signal in the first frequency band so that data communication with the communication partner is possible. In a state where data communication with a plurality of communication partners is possible, the control unit selects a communication partner performing data communication from the plurality of communication partners, and uses the second transmission / reception unit in the second frequency band. Send / receive data to / from the selected communication partner.
[Selection] Figure 2

Description

  The present invention relates to a wireless communication technique for performing communication using a plurality of frequency bands.

  In recent years, wireless communication devices that enable the realization of a ubiquitous society, such as RFID (Radio Frequency IDentification) and sensor network terminals, have become inexpensive, and stable mass supply has become possible. The arrival of the ubiquitous era in which such wireless communication devices are mounted on various devices is expected.

  Since this type of wireless communication device desirably operates on a battery for a long time, it is required to reduce power consumption as much as possible. On the other hand, the amount of data transmitted and received by wireless communication tends to increase, and it is desired to increase the speed of data communication in the future.

The maximum rate of data communication depends on the carrier frequency band. By using the high frequency band, the data communication can be speeded up. In wireless communication, the use of frequency bands is important in various aspects including this. For this reason, various devices have been proposed for the usage method of frequency bands. For example, there is a technique for defining a plurality of frequency bands and selectively using them (see Patent Document 1).
JP 2006-101422 A

  In order to use the high frequency band, the modulation circuit, the demodulation circuit, and the like are required to operate at high speed. However, since a circuit that operates at high speed consumes a large amount of power, the power consumption of the wireless communication device is increased. Wireless communication devices are required to achieve both trade-off power consumption reduction and high-speed data communication. In addition, a method for successfully controlling communication between a wireless communication device and a plurality of communication partners has not been established, and it cannot be said that appropriate control is necessarily performed.

  An object of the present invention is to provide a wireless communication apparatus and a wireless communication method capable of realizing high-speed data communication with low power consumption and appropriately controlling a communication partner of data communication.

In order to achieve the above object, a wireless communication device of the present invention is a wireless communication device that performs data communication using carriers in a plurality of frequency bands,
A first transmission / reception unit for transmitting / receiving a signal using a carrier wave in a first frequency band;
A second transmitting / receiving unit that transmits and receives a signal using a carrier having a second frequency band different from the first frequency band;
By using the first transmission / reception unit to transmit and receive a control signal in the first frequency band, data communication with the communication partner is enabled, and the priority of the communication partner in which data communication is enabled In a state where data communication with a plurality of communication partners is possible, a communication partner for performing data communication is selected from the plurality of communication partners based on the priority, and the second transmitting / receiving unit is used. And a control unit that transmits / receives data to / from the selected communication partner in the second frequency band.

The wireless communication method of the present invention is a wireless communication method for performing data communication using carriers in a plurality of frequency bands,
A state in which data communication with a communication partner is enabled by transmitting and receiving a control signal in the first frequency band, and the priority of the communication partner in a state in which data communication is enabled is managed,
In a state in which data communication with a plurality of communication partners is possible, a communication partner that performs data communication from the plurality of communication partners is selected based on the priority,
Data is transmitted / received to / from the selected communication partner in a second frequency band different from the first frequency band.

  According to the present invention, a communication partner performing data communication is selected from a plurality of communication partners by communication in the first frequency band, and data is transmitted by communication in the second frequency band. Therefore, in a system that realizes high-speed data communication with low power consumption by properly using frequency bands, it is possible to appropriately control the communication partner of data communication.

  Embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  The wireless communication apparatus of this embodiment performs communication using a plurality of frequency bands. In the present embodiment, in order to simplify the description, the simplest case of two frequency bands will be described.

  Further, in the present embodiment, the “frequency band” means each of a plurality of frequency ranges defined on the basis of legal regulations and standardization regulations regarding wireless use, represented by the Radio Law. However, the frequency band division method according to legal provisions is shown as a typical example, and the frequency band division method is essentially arbitrary, and the present invention is limited to the division of legal regulations and standardization regulations. It is not something.

(First embodiment)
FIG. 1 is a conceptual diagram of a basic configuration of a wireless communication system according to the first embodiment. Referring to FIG. 1, communication using two frequency bands is performed between the wireless communication device 10 1 and the wireless communication device 10 2 . As an example, it is assumed that the low frequency band is the 400 MHz band, and the high frequency band is the 2.4 GHz band. The wireless communication device 10 1 and the wireless communication device 10 2 have the same configuration.

  FIG. 2 is a block diagram showing a configuration of the wireless communication apparatus shown in FIG. Referring to FIG. 2, the wireless communication device 10 includes filters 21 and 24, transmission / reception units 22 and 25, and a control unit 23. The filter 21 and the transmission / reception unit 22 are for 2.4 GHz band communication (hereinafter referred to as “high band communication”), and the filter 24 and the transmission / reception unit 25 are for 400 MHz band communication (hereinafter referred to as “low band communication”).

  The transmission / reception unit 22 transmits / receives a signal via the filter 21 using a carrier wave belonging to the 2.4 GHz band. The transmission / reception unit 25 transmits / receives a signal via a filter 24 using a 400 MHz band carrier wave. The transmission / reception unit 22 for high-frequency communication can perform higher-speed communication than the transmission / reception unit 25 for low-frequency communication, but consumes more power.

  The control unit 23 transmits / receives a control signal to / from a communication partner through low-frequency communication through the transmission / reception unit 25, thereby performing an authentication process with the communication partner so that data communication by high-frequency communication is possible. In this way, the control unit 23 can make data communication with a plurality of communication partners possible.

  Since the wireless communication device 10 has a configuration for performing data communication by high-frequency communication through control by low-frequency communication as described above, connection information for managing connection with a communication partner before starting data communication. Can be generated and held, and used for data communication control. Therefore, the control unit 23 manages the priority of the connected communication partner as connection information, and controls data communication with a plurality of communication partners by following the priority.

  In a state in which data communication with a plurality of communication partners is possible, the control unit 23 controls the start and stop of data communication by high-frequency communication using low-frequency communication, and the priority is selected from the plurality of communication partners. A communication partner for data communication is selected based on the above. Further, the control unit 23 transmits and receives data to and from a communication partner through high frequency communication through the transmission and reception unit 22 based on control by low frequency communication.

  According to this, in a system that uses a plurality of frequency bands in order to achieve both low power consumption and high-speed data communication, data communication is performed based on priority among a plurality of communication partners by low-frequency communication. Since a communication partner is selected and data is transmitted / received by high-frequency communication, high-speed data communication with low power consumption can be realized, and the communication partner of data communication can be appropriately controlled. In that case, low-frequency communication contributes to reduction of power consumption, and high-frequency communication contributes to high-speed data communication.

  As an example of control of data communication based on priority, when the control unit 23 is connected to a communication partner by control using low-frequency communication, the connection unit information including connection destination information indicating the connection destination and priority is recorded in the connection management table. You may decide to do it. Then, the control unit 23 may control data communication with a plurality of communication partners according to the priority of the connection management table.

  When the wireless communication apparatus 10 communicates with a plurality of communication partners, the control unit 23 preferentially selects a communication partner that performs data communication by high-frequency communication from communication partners with a high priority with reference to the connection management table. To do. At that time, the control unit 23 performs control such as selection or switching of a communication partner by transmitting and receiving a control signal by low-frequency communication. As a result, data communication control can be performed such that data communication with a communication partner during communication is temporarily stopped and data communication with another communication partner having a high priority is performed during that time.

  In addition, in the data communication control, the control unit 23 may switch the communication partner that performs data communication by high-frequency communication by dynamically changing the priority of the communication partner. As a result, the state that the wireless communication device of the connection destination that does not go around in the order of performing the high-frequency communication repeats transmission of the communication request is alleviated, and wasteful power consumption is reduced.

  FIG. 3 is a sequence diagram illustrating an operation example of the wireless communication system according to the first embodiment. Referring to FIG. 3, there are three wireless communication apparatuses 10 called nodes A, B, and C.

  First, the node A and the node B perform the data communication by the high frequency communication through the authentication by the low frequency communication in the 400 MHz band (step 101) and the activation control by the high frequency communication in the 2.4 GHz band (step 102). Perform (step 103).

  In the meantime, a request for data communication occurs between the node C and the node B, and the node B and the node C authenticate by low-frequency communication (step 104). Node B performs priority control based on the priority of node A and the priority of node C. Here, it is assumed that the determination result of the priority control is that communication with the node A is temporarily stopped and communication with the node C is interrupted.

  Therefore, the node B performs interrupt control with the node C (step 105), and also performs standby control with the node A (step 106). The interrupt control is a control for temporarily stopping data communication with a communicating node and performing data communication with another node during that time. The standby control is control for temporarily suspending one data communication with the interrupt control.

  Subsequently, after a communication request by high-frequency communication from node C to node B (step 107), node B and node C perform data communication by high-frequency communication (step 108). When the data communication between the interrupted node B and node C is completed, the data communication between the node B and node A is resumed (step 109).

  FIG. 4 is a diagram for explaining an operation example of the wireless communication apparatus according to the first embodiment. FIG. 4 shows an ad hoc network configured by the wireless communication device according to the first embodiment. Here, it is assumed that all the nodes in FIG. 4 are the wireless communication devices 10 shown in FIG.

  FIG. 4 shows a session S1 from the server 31 at the address (0.0.0) to the end node 32 at the address (1.3.1), and the end node at the address (1.2.2) from the server 31. Session S2 leading to 33 is shown.

  The communication path of the session S1 is from the server 31 to the relay node 34 having the address (1.1.0), the relay node 35 having the address (1.2.0), and the relay node 36 having the address (1.3.0). To the end node 32 via.

  The communication path of the session S2 reaches the end node 33 from the server 31 via the relay node 34 with the address (1.1.0) and the relay node 35 with the address (1.2.0).

  Here, attention is paid to the relay node 35. The control unit 23 of the relay node 35 is connected to the communication partner under control by low-frequency communication, and registers the connection information in the connection management table. FIG. 5 is a table showing a connection management table managed by the relay node 35 in the first embodiment. In the connection management table, the control unit 23 of the relay node 35 transmits and receives control signals by low-frequency communication, and connection information with a communication partner connected through an authentication process is recorded.

  Referring to FIG. 5, three pieces of connection information of management numbers 1 to 3 are registered. Each of the connection information indicates a connection with the relay node 34, the end node 33, and the relay node 36 illustrated in FIG. The connection with the management number 1 has a priority “1”, the connection with the management number 2 has a priority “2”, and the connection with the management number 3 has a priority “3”. Here, it is assumed that the priority is higher as the number is smaller.

  Close to the server 31, the connection with the relay node 34, which is a connection destination common to the two sessions S1 and S2, is given the highest priority. Further, the connection with the terminal node 33 that is the terminal point of the session S2 is set as the second priority, and the connection with the downstream relay node 36 in the session S1 is set as the third priority. As a result, the session S2 has priority over the session S1.

  The priority given to each connection may be dynamically changed, may be fixed for each communication partner at the time of node installation, or determined at the time of session establishment. Well. In addition, the amount of data for holding the priority is extremely small.

(Second Embodiment)
In the first embodiment, an example is shown in which control such as switching of data communication by high-frequency communication with a plurality of communication partners is performed by low-frequency communication, but the present invention is not limited to this. In the second embodiment, an example in which a wireless communication apparatus performs control for selecting a communication partner for data communication without using low-band communication after connecting to the communication partner through authentication processing by low-band communication or the like. Show.

  The basic configuration of the wireless communication system of the second embodiment is the same as that of the first embodiment shown in FIG. The wireless communication apparatus of the second embodiment is the same as that of the first embodiment shown in FIG. However, in the wireless communication device 10 of the second embodiment, a part of the operation of the control unit 23 is different from that of the first embodiment.

  The control unit 23 of the wireless communication apparatus 10 according to the second embodiment performs a process of switching a communication partner that performs data communication among a plurality of communication partners that have been connected once, without cooperation with the communication partner through low-frequency communication. Start periodically with a period. Further, instead of periodically starting all of the plurality of connected communication partners, a communication partner to be periodically started may be set in advance.

  For example, the control unit 23 registers in the connection management table a periodic activation type indicating whether or not to periodically activate, and periodically starts data communication based on wide area communication based on the activation type. Also good. FIG. 6 is a table showing a connection management table managed by the wireless communication apparatus according to the second embodiment. FIG. 6 shows a connection management table of the relay node 35 in the ad hoc network shown in FIG. 4 to which the wireless communication apparatus of the second embodiment is applied. Compared with the connection management table of the first embodiment shown in FIG. 5, the difference is that a periodic activation type is added to the connection information. The connection with the relay node 34 with the management number 1 and the connection with the relay node 36 with the management number 2 are set as targets for periodic activation (periodic activation type = “◯”). The control unit 23 may refer to this connection management table and periodically start data communication with a communication partner whose periodic activation type is “◯”.

  According to this, even if a malfunction occurs in low-frequency communication due to external disturbance after connecting to the communication partner, data communication with the communication partner can be continued as long as high-frequency communication is possible. In general, since there is a low probability that radio interference occurs simultaneously in a plurality of frequency bands having different frequencies, there are cases where high-frequency communication is possible even when low-frequency communication is an obstacle. Therefore, according to this embodiment, the tolerance with respect to the disturbance from the outside can be improved.

  Note that the amount of data for holding the periodic activation type in this embodiment is extremely small. In addition, it is possible to set and change priority and periodic activation type by wireless communication.

  In addition, the control unit 23 of the present embodiment may control data communication with a communication partner once connected by low-frequency communication, and thereafter perform high-frequency communication. For example, in the sequence diagram shown in FIG. 3, the interrupt control in step 105 and the standby control in step 106 may be performed by high-frequency communication in the 2.4 GHz band. According to this, even if there is a problem in low-frequency communication due to external disturbance after connecting to the communication partner, data communication with the communication partner should be continued with appropriate control as long as high-frequency communication is possible. Can do.

  In the above example, control of data communication with a communication partner once connected by low-frequency communication is performed by high-frequency communication thereafter, regardless of whether there is a failure in low-frequency communication. However, the present invention is not limited to this. Only when a failure occurs in low-frequency communication, control of data communication with a communication partner may be performed by high-frequency communication.

  In the present embodiment, when a failure occurs in low-frequency communication, the authentication processing (steps 101 and 104) shown in FIG. 3 may be performed using high-frequency communication.

  In the first and second embodiments described above, the case where there are two frequency bands is illustrated, but the present invention is not limited to this. As another example, there may be three or more frequency bands. For example, there may be one frequency band for transmitting and receiving control signals and a plurality of frequency bands for transmitting and receiving data. In that case, data communication in a plurality of frequency bands may be controlled with a control signal in one frequency band. A plurality of frequency bands for transmitting and receiving control signals may also be used. In that case, a frequency band for transmitting / receiving a control signal may be associated with each frequency band for transmitting / receiving data, or may not be associated.

  In the first and second embodiments described above, the 400 MHz band and the 2.4 GHz band are exemplified, but the present invention is not limited to this. The present invention can be similarly applied to any other frequency.

It is a conceptual diagram of the basic composition of the radio | wireless communications system by 1st Embodiment. It is a block diagram which shows the structure of the radio | wireless communication apparatus shown in FIG. FIG. 5 is a sequence diagram illustrating an operation example of the wireless communication system according to the first embodiment. It is a figure for demonstrating the operation example of the radio | wireless communication apparatus by 1st Embodiment. 4 is a table showing a connection management table managed by a relay node 35 in the first embodiment. It is a table | surface which shows the connection management table managed with the radio | wireless communication apparatus by 2nd Embodiment.

Explanation of symbols

10 1 , 10 2 , 10 Wireless communication device 21, 24 Filter 22, 25 Transmission / reception unit 23 Control unit

Claims (18)

  1. A wireless communication device that performs data communication using carrier waves in a plurality of frequency bands,
    A first transmission / reception unit for transmitting / receiving a signal using a carrier wave in a first frequency band;
    A second transmitting / receiving unit that transmits and receives a signal using a carrier having a second frequency band different from the first frequency band;
    By using the first transmission / reception unit to transmit and receive a control signal in the first frequency band, data communication with the communication partner is enabled, and the priority of the communication partner in which data communication is enabled In a state where data communication with a plurality of communication partners is possible, a communication partner for performing data communication is selected from the plurality of communication partners based on the priority, and the second transmitting / receiving unit is used. A wireless communication apparatus comprising: a control unit that transmits and receives data to and from the selected communication partner in the second frequency band.
  2.   The wireless communication apparatus according to claim 1, wherein the control unit transmits / receives data to / from a selected communication partner by controlling data communication with the communication partner according to the priority.
  3.   The wireless communication apparatus according to claim 2, wherein the control unit controls selection of a communication partner performing data communication by dynamically changing the priority.
  4.   The control unit performs data communication by periodically starting data communication with a plurality of communication partners in a state where data communication is possible without using communication by the first transmitting / receiving unit. The wireless communication device according to claim 1, wherein the partner is switched.
  5.   The control unit, for each of the plurality of communication partners, manages a periodic activation type indicating whether or not to be a regular activation target, and activates data communication with the communication partner according to the periodic activation type, The wireless communication apparatus according to claim 4.
  6.   The control unit switches data communication with a plurality of communication partners in a state where data communication is possible by using communication by the second transmission / reception unit to switch communication partners performing data communication. The radio | wireless communication apparatus of any one of Claim 1 to 3.
  7.   The wireless communication apparatus according to claim 1, wherein the first frequency band is a frequency band lower than the second frequency band.
  8.   8. The wireless communication device according to claim 1, wherein one or both of the first frequency band and the second frequency band are a plurality of frequency bands. 9.
  9.   The control unit includes a connection management table for recording information related to a connection with a communication partner, and transmits and receives the control signal to and from the communication partner in the first frequency band. The connection information with the communication partner is registered in the connection management table when communication is possible, and the connection management table is referred to when controlling the data communication in the second frequency band. The wireless communication device according to any one of 1 to 8.
  10. A wireless communication method for performing data communication using carriers of a plurality of frequency bands,
    A state in which data communication with a communication partner is enabled by transmitting and receiving a control signal in the first frequency band, and the priority of the communication partner in a state in which data communication is enabled is managed,
    In a state in which data communication with a plurality of communication partners is possible, a communication partner that performs data communication from the plurality of communication partners is selected based on the priority,
    A wireless communication method for transmitting and receiving data to and from the selected communication partner in a second frequency band different from the first frequency band.
  11.   The wireless communication method according to claim 10, wherein data communication with the selected communication partner is performed by controlling data communication with the communication partner according to the priority.
  12.   The wireless communication method according to claim 11, wherein selection of a communication partner performing data communication is controlled by dynamically changing the priority.
  13.   The communication partner for data communication is switched by periodically starting data communication with the plurality of communication partners in a state where data communication is possible without using communication in the first frequency band. Item 13. The wireless communication method according to any one of Items 10 to 12.
  14.   The periodic activation type indicating whether or not each of the plurality of communication partners is a target of periodic activation is managed, and data communication with the communication partner is activated according to the periodic activation type. Wireless communication method.
  15.   The communication partner for data communication is switched by controlling data communication with the plurality of communication partners in a state where data communication is possible using the communication in the second frequency band. The wireless communication method according to any one of the above.
  16.   The wireless communication method according to claim 10, wherein the first frequency band is a frequency band lower than the second frequency band.
  17.   The wireless communication method according to any one of claims 10 to 16, wherein one or both of the first frequency band and the second frequency band is a plurality of frequency bands.
  18. Prepare a connection management table to record information related to the connection with the communication partner,
    Registering connection information with the communication partner in the connection management table when enabling data communication with the communication partner by transmitting and receiving the control signal with the communication partner in the first frequency band,
    The wireless communication method according to any one of claims 10 to 17, wherein the connection management table is referred to when the data communication in the second frequency band is controlled.
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