WO2011158377A1 - 無線通信方法、無線通信装置および無線通信システム - Google Patents
無線通信方法、無線通信装置および無線通信システム Download PDFInfo
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- WO2011158377A1 WO2011158377A1 PCT/JP2010/060380 JP2010060380W WO2011158377A1 WO 2011158377 A1 WO2011158377 A1 WO 2011158377A1 JP 2010060380 W JP2010060380 W JP 2010060380W WO 2011158377 A1 WO2011158377 A1 WO 2011158377A1
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- wireless communication
- communication device
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- 238000004891 communication Methods 0.000 title claims abstract description 203
- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000005540 biological transmission Effects 0.000 claims abstract description 73
- 238000012545 processing Methods 0.000 claims abstract description 54
- 230000008569 process Effects 0.000 claims abstract description 33
- 239000000284 extract Substances 0.000 claims abstract description 15
- 238000010586 diagram Methods 0.000 description 12
- 101100533725 Mus musculus Smr3a gene Proteins 0.000 description 9
- 230000004044 response Effects 0.000 description 9
- 101100274486 Mus musculus Cited2 gene Proteins 0.000 description 6
- 101150096622 Smr2 gene Proteins 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000011664 signaling Effects 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 108010076504 Protein Sorting Signals Proteins 0.000 description 2
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
Definitions
- the present invention relates to a wireless communication method, a wireless communication apparatus, and a wireless communication system.
- LTE Long Term Evolution
- LTE-A Long Term Evolution E-Advanced
- Such wireless communication technology can be used not only for wireless communication by a terminal device operated by a user such as a mobile phone, but also for wireless communication by various other devices such as measuring devices.
- a measuring device such as a gas meter or an electric meter reports measurement data to a server via a wireless communication network.
- MTC Machine Type Communication
- the wireless communication device when not performing data transmission / reception, can shift to a state (idle state) in which a connection related to wireless communication is released.
- the idle wireless communication device can establish a connection again by performing a predetermined procedure (message transmission / reception) with the wireless communication device of the communication partner.
- the present invention has been made in view of the above points, and provides a wireless communication method, a wireless communication apparatus, and a wireless communication system capable of efficiently transmitting data while suppressing overhead of wireless communication. Objective.
- a wireless communication method of a wireless communication system includes first and second wireless communication devices, and in which the first wireless communication device transmits data to the second wireless communication device.
- the control information is transmitted at a timing at which control information used for processing for establishing the connection can be transmitted.
- a message including data different from is transmitted to the second wireless communication apparatus.
- the second wireless communication apparatus receives a message transmitted from the first wireless communication apparatus at a timing at which the first wireless communication apparatus can transmit control information.
- the second wireless communication device extracts data included in the received message.
- a wireless communication system includes first and second wireless communication devices, and in which the first wireless communication device transmits data to the second wireless communication device.
- the first wireless communication device determines a timing at which control information used for processing for establishing a connection can be transmitted to the second wireless communication device when a connection is not established with the second wireless communication device.
- a control unit and a transmission unit configured to transmit a message including data different from the control information to the second wireless communication device at a timing determined by the control unit.
- the second wireless communication device is included in the reception unit that receives a message transmitted from the first wireless communication device at a timing at which the first wireless communication device can transmit control information, and the message received by the reception unit.
- a data processing unit for extracting data.
- the wireless communication apparatus According to the wireless communication method, the wireless communication apparatus, and the wireless communication system, it is possible to efficiently transmit data while suppressing the overhead of wireless communication.
- FIG. 1 is a diagram illustrating a wireless communication system according to the first embodiment.
- the wireless communication system according to the first embodiment includes wireless communication devices 1 and 2.
- the wireless communication device 2 may be implemented as a base station, and the wireless communication device 1 may be implemented as a subscriber station that accesses the wireless communication device 2.
- the wireless communication device 1 transmits data to the wireless communication device 2 by wireless communication.
- the wireless communication devices 1 and 2 can establish and release a wireless communication connection as appropriate.
- the wireless communication device 1 includes a control unit 1a and a transmission unit 1b.
- the control unit 1a determines the timing at which control information used for the process of establishing the connection can be transmitted to the wireless communication apparatus 2.
- the transmission unit 1b transmits a message including data different from the control information to the wireless communication device 2 at the timing determined by the control unit 1a.
- the wireless communication device 2 includes a receiving unit 2a and a data processing unit 2b.
- the receiving unit 2a receives a message transmitted at a timing at which the wireless communication device 1 can transmit control information used for processing for establishing a connection from the wireless communication device 1 in which the connection with the own device has not been established.
- the data processing unit 2b extracts data different from the control information from the message received by the receiving unit 2a. For example, the data processing unit 2b transfers the extracted data to a predetermined communication device.
- connection established between the wireless communication apparatuses 1 and 2 may be a connection defined by a radio resource control (RRC) protocol that is a layer 3 protocol.
- the control information may be RRC control information.
- the timing at which the wireless communication device 1 can transmit control information includes, for example, the timing before the connection is established after the wireless communication device 1 performs random access to the wireless communication device 2.
- the message transmitted by the wireless communication apparatus 1 may include both control information and data different from the control information, or may selectively include either one of data different from the control information and control information.
- the wireless communication apparatus 2 extracts data different from the control information from the received message, the wireless communication apparatus 2 may end the wireless communication with the wireless communication apparatus 1 without performing the process of establishing the connection.
- identification information of a wireless communication device that may transmit data different from control information at the above timing is registered in the wireless communication device 2 in advance, and the wireless communication device 1 sends its own device identification information in a message. May be inserted.
- the wireless communication device 2 extracts data different from the control information from the message only when the identification information included in the received message is registered in advance.
- the wireless communication device 1 may insert flag information indicating whether or not data different from the control information is included in the message. In this case, the wireless communication device 2 can determine whether to perform processing for extracting data different from the control information from the received message based on the flag information.
- the wireless communication device 1 when the wireless communication device 1 has not established a connection with the wireless communication device 2, it can transmit control information used for processing for establishing the connection. At a timing, a message including data different from the control information is transmitted to the wireless communication device 2.
- the wireless communication device 2 receives a message transmitted from the wireless communication device 1 at a timing at which the wireless communication device 1 can transmit control information. Then, the wireless communication device 2 extracts data included in the received message.
- data can be transmitted from the wireless communication device 1 to the wireless communication device 2 before the connection is established between the wireless communication devices 1 and 2.
- the wireless communication device 2 can also end wireless communication with the wireless communication device 1 without performing a process of establishing a connection. Therefore, it is possible to efficiently transmit data while suppressing the overhead of wireless communication.
- the above wireless communication method is particularly effective when the wireless communication device 1 intermittently transmits data or when the amount of data transmitted at a time is relatively small.
- the wireless communication system according to the first embodiment can be realized by using LTE or LTE-A wireless communication technology. It can also be realized as an MTC system.
- an example of an MTC system realized by using LTE or LTE-A wireless communication technology is given.
- FIG. 2 is a diagram illustrating a wireless communication system according to the second embodiment.
- the wireless communication system according to the second embodiment includes MTC devices 10 and 10a, a base station 20, an MTC server 30, and a network 40.
- the base station 20 can perform data communication with the MTC server 30 via the network 40.
- the MTC devices 10 and 10a are wireless communication devices connected to a meter provided in a home or office. As a meter, a gas meter, an electric meter, a water meter, etc. can be considered.
- the MTC devices 10 and 10 a access the base station 20 and transmit various data including MTC data indicating the measurement value of the meter to the MTC server 30 via the base station 20. It is assumed that the amount of MTC data transmitted by the MTC devices 10 and 10a at a time is small. Further, it is assumed that the cycle for transmitting MTC data is long, such as a one-month cycle.
- the MTC device 10 has a function of transmitting MTC data without establishing an RRC connection with the base station 20, as will be described later.
- the MTC device 10a does not have a function of transmitting MTC data without establishing an RRC connection.
- the RRC protocol is a layer 3 protocol related to wireless communication, and includes a mobility management function.
- the base station 20 is a communication device that performs wireless communication with the MTC devices 10 and 10 a and performs wired communication with the MTC server 30.
- the base station 20 receives access from the MTC devices 10 and 10a, and receives data from the MTC devices 10 and 10a wirelessly.
- the base station 20 transfers the MTC data to the MTC server 30 via the network 40.
- the network 40 includes, for example, a core network and the Internet managed by a communication carrier.
- the MTC server 30 is a server computer that collects MTC data from the MTC devices 10 and 10a and monitors the meter.
- the collected MTC data is used for charge management, for example.
- the MTC server 30 can be provided in a network of a business operator (for example, a gas company, a power company, a water company, etc.) in which a meter is installed.
- FIG. 3 is a block diagram illustrating the MTC device.
- the MTC device 10 includes a reception unit 11, a meter management unit 12, a transmission data generation unit 13, a transmission unit 14, and a control unit 15.
- the receiving unit 11 performs radio signal processing on a signal received from the base station 20 via an antenna, and down-converts the signal from a high frequency radio signal to a low frequency baseband signal. Then, the receiving unit 11 demodulates and error-correction-decodes the baseband signal, and extracts user data and control information transmitted from the base station 20.
- the receiving unit 11 outputs the extracted user data to the meter management unit 12 and outputs the extracted control information to the control unit 15.
- the user data includes, for example, a command transmitted from the MTC server 30 for managing and operating the meter.
- the control information includes a random access response and RRC control information described later.
- the meter management unit 12 manages the meter based on the user data acquired from the reception unit 11.
- the meter management unit 12 monitors the measurement value of the meter, and outputs MTC data indicating the measurement value to the transmission data generation unit 13 at a predetermined cycle or timing designated by the MTC server 30.
- the measured value of the meter may include the usage of “things” such as gas, electricity, and water.
- the transmission data generation unit 13 generates a message to be transmitted to the base station 20 according to the control of the control unit 15 and outputs the message to the transmission unit 14.
- the transmission data generation unit 13 may insert the MTC data acquired from the meter management unit 12 or the RRC control information acquired from the control unit 15 into the message.
- a terminal ID and a flag to be described later may be inserted into the message.
- the transmission unit 14 generates a transmission signal by performing error correction encoding and modulation on data that is a message acquired from the transmission data generation unit 13. Further, when data to be transmitted to the base station 20 is generated when the MTC device 10 is in an idle state, the transmission unit 14 generates a random access preamble as a transmission signal. The random access preamble is transmitted on a random access channel. Then, the transmission unit 14 performs radio signal processing on the transmission signal, and up-converts the low-frequency baseband signal to a high-frequency radio signal. The transmission unit 14 transmits a transmission signal, which is a radio signal, to the base station 20 via the antenna.
- the control unit 15 controls RRC connection between the MTC device 10 and the base station 20 and data transmission (uplink communication) from the MTC device 10 to the base station 20.
- the control unit 15 includes a terminal information management unit 16, a flag setting unit 17, and an RRC processing unit 18.
- the terminal information management unit 16 manages a terminal ID that is identification information given to the MTC device 10 in advance. When inserting the terminal ID into the message, the terminal information management unit 16 outputs the terminal ID to the transmission data generation unit 13.
- the flag setting unit 17 determines the value of the flag and outputs it to the transmission data generation unit 13 when inserting the flag into the message.
- the RRC processing unit 18 transmits / receives RRC control information to / from the base station 20, and performs a process of establishing an RRC connection and a process of releasing the RRC connection. For example, when the RRC connection is not established, the RRC processing unit 18 determines the timing at which the RRC connection request can be transmitted to the base station 20 based on the control information acquired from the receiving unit 11. Then, an RRC connection request that is RRC control information is output to the transmission data generating unit 13. However, when MTC data is inserted into the message before the RRC connection is established, the RRC connection request is not output.
- FIG. 4 is a block diagram showing the base station.
- the base station 20 includes a reception unit 21, a reception data processing unit 22, a wired communication unit 23, a transmission unit 24, and a control unit 25.
- the receiving unit 21 performs radio signal processing on signals received from the MTC devices 10 and 10a via the antenna, and down-converts the high-frequency radio signal to a low-frequency baseband signal. Then, the baseband signal is demodulated and error correction decoded, and the message transmitted by the MTC devices 10 and 10 a is output to the received data processing unit 22.
- the reception unit 21 detects the random access preamble transmitted by the MTC devices 10 and 10a.
- the reception data processing unit 22 extracts user data (including MTC data) and control information included in the message acquired from the reception unit 21 according to the control of the control unit 25.
- the reception data processing unit 22 outputs the extracted user data to the wired communication unit 23 and outputs the extracted control information to the control unit 25.
- the control information includes RRC control information.
- the received data processing unit 22 determines which of the RRC control information and the MTC data is inserted in the message. This determination is made by confirming whether the terminal ID included in the message is registered in the terminal information storage unit 26, or whether the flag included in the message is a predetermined value. Details of the determination method will be described later.
- the wired communication unit 23 is connected to the network 40 and is a communication interface that performs wired communication.
- the wired communication unit 23 transmits the MTC data acquired from the reception data processing unit 22 and the control information addressed to the MTC server 30 acquired from the control unit 25 to the MTC server 30 via the network 40. Further, the wired communication unit 23 outputs user data addressed to the MTC devices 10 and 10 a received from the MTC server 30 to the transmission unit 24.
- the transmission unit 24 performs error correction coding and modulation on the user data acquired from the wired communication unit 23 and the control information acquired from the control unit 25 to generate a transmission signal. Further, when the random access preamble is detected by the receiving unit 21, the transmitting unit 24 generates a random access response as a transmission signal. Then, the transmission unit 24 performs radio signal processing on the transmission signal and up-converts the low-frequency baseband signal to a high-frequency radio signal. The transmission unit 24 transmits a transmission signal, which is a radio signal, to the MTC devices 10 and 10a via the antenna.
- the control unit 25 controls access from the MTC devices 10 and 10a to the base station 20 and reception of MTC data from the MTC devices 10 and 10a.
- the control unit 25 includes a terminal information storage unit 26 and an RRC processing unit 27.
- the terminal information storage unit 26 is a wireless communication device (including the MTC devices 10 and 10a) that accesses the base station 20, and a device (MTC device 10) that may transmit MTC data before the RRC connection is established. (Including the terminal ID).
- the terminal ID of the MTC device 10 may be registered in advance, or may be registered through signaling between the MTC device 10 and the base station 20. In the latter case, the control unit 25 transmits control information indicating the terminal ID registered in the terminal information storage unit 26 to the MTC server 30 via the wired communication unit 23.
- the RRC processing unit 27 transmits / receives RRC control information to / from the MTC devices 10 and 10a, and performs processing for establishing RRC connection and processing for releasing RRC connection. For example, when the RRC processing unit 27 acquires the RRC connection request from the reception data processing unit 22, it performs RRC protocol processing and outputs RRC control information (RRC connection setting information) in response to the received RRC connection request to the transmission unit 24. To do.
- FIG. 5 is a sequence diagram showing a flow of terminal registration. The process illustrated in FIG. 5 will be described along with step numbers.
- Step S11 The MTC device 10 transmits a random access preamble to the base station 20.
- the random access preamble to be transmitted is selected from a plurality of predefined signal sequence candidates.
- the message transmitted in step S11 may be referred to as message 1 (Msg1). It should be noted that contention may occur in Msg1, that is, a plurality of wireless communication apparatuses may transmit the same signal sequence at the same timing.
- Step S12 Upon detecting Msg1 included in the received signal, the base station 20 transmits a random access response message in its own cell. However, the base station 20 has not yet recognized the transmission source of Msg1 at this time.
- the message transmitted in step S12 may be referred to as message 2 (Msg2).
- Step S13 Upon receiving Msg2 from the base station 20, the MTC device 10 transmits an RRC connection request message to the base station 20.
- the RRC connection request message includes identification information of the MTC device 10.
- the message transmitted in step S13 may be referred to as Msg3.
- Step S14 Upon receiving Msg3, the base station 20 recognizes the MTC device 10 that is the transmission source from the identification information included in Msg3. And the process which establishes RRC connection is advanced and an RRC connection setting message is transmitted to the MTC device 10 with the received identification information.
- the message transmitted in step S14 may be referred to as message 4 (Msg4).
- Msg4 message 4
- the base station 20 transmits Msg4 to any one of the competing transmission sources.
- the MTC device 10 returns to step S11 and transmits Msg1 to the base station 20 again.
- Step S15 Upon receiving Msg4 from the base station 20, the MTC device 10 performs processing for establishing an RRC connection, and returns an RRC connection setting completion message.
- Step S ⁇ b> 16 When an RRC connection is established with the base station 20, the MTC device 10 transmits a terminal registration request message to the base station 20. This terminal registration request message includes the terminal ID of the MTC device 10.
- Step S ⁇ b> 17 Upon receiving the terminal registration request message from the MTC device 10, the base station 20 registers the terminal ID of the MTC device 10 in its own station. (Step S18) The base station 20 transmits a terminal registration request message to the MTC server 30 via the network 40. This terminal registration request message includes the terminal ID of the MTC device 10.
- Step S19 Upon receiving the terminal registration request message from the base station 20, the MTC server 30 registers the terminal ID of the MTC device 10 in its own apparatus.
- Step S20 The MTC server 30 transmits a terminal registration completion message to the base station 20 as a response to the terminal registration request message.
- Step S ⁇ b> 21 Upon receiving the terminal registration completion message from the MTC server 30, the base station 20 transmits a terminal registration completion message to the MTC device 10.
- Step S22 Upon receiving the terminal registration completion message from the base station 20, the MTC device 10 transmits an RRC connection release message to the base station 20, and performs a process of releasing the RRC connection.
- the base station 20 performs processing for releasing the RRC connection.
- the terminal ID of the MTC device 10 can be registered in the base station 20 by performing signaling between the MTC device 10 and the base station 20. Note that the above signaling may be performed only when the MTC device 10 is first connected to the base station 20. Further, from the viewpoint of security or the like, an expiration date may be provided for the terminal ID registered in the base station 20, and signaling may be executed periodically.
- FIG. 6 shows the data structure of Msg3.
- the MTC device 10 having a function of transmitting MTC data without establishing an RRC connection transmits type A or type B Msg3 shown in FIG.
- the MTC device 10a that does not have the function of transmitting MTC data without establishing an RRC connection transmits Type C Msg3.
- Type A Msg3 includes a terminal ID, a flag, and MTC data.
- Type B Msg3 includes a terminal ID, a flag, and RRC control information used for establishing an RRC connection.
- Type C Msg3 includes a terminal ID and RRC control information.
- the base station 20 since the base station 20 performs radio communication with both of the MTC devices 10 and 10a, there is a possibility of receiving any Msg3 of types A, B, and C. Therefore, the base station 20 first determines whether the terminal ID included in Msg3 is registered in the base station 20, and determines the type of data included in Msg3 by checking the flag only when it is registered.
- FIG. 7 is a flowchart showing data transmission processing.
- the process shown in FIG. 7 is executed by the MTC device 10. In the following, the process illustrated in FIG. 7 will be described in order of step number.
- the control unit 15 determines whether there is user data (including MTC data) to be transmitted to the base station 20. If there is user data to be transmitted, the process proceeds to step S32. If there is no user data to be transmitted, the process ends.
- Step S32 The transmission unit 14 transmits a random access preamble (Msg1) to the base station 20.
- the receiving unit 11 receives a random access response message (Msg2) from the base station 20.
- Msg1 random access preamble
- Msg2 random access response message
- Step S33 The control unit 15 receives Msg2 from the base station 20 to identify the timing for transmitting Msg3 to the base station 20. Further, the control unit 15 determines whether the user data transmitted to the base station 20 can be transmitted without RRC connection. For example, it is determined that MTC data of a predetermined size or less can be transmitted without RRC connection, and it is determined that other user data cannot be transmitted without RRC connection. If it can be transmitted without RRC connection, the process proceeds to step S34. Otherwise, the process proceeds to step S35.
- Step S34 The transmission data generation unit 13 generates a message (the above-mentioned type A Msg3) including the terminal ID, the flag, and the MTC data.
- the transmission unit 14 transmits Msg3 to the base station 20.
- the receiving unit 11 receives Msg4 as a response to Msg3 from the base station 20. As a result, the MTC data transmission process ends and the state returns to the idle state.
- Step S35 The transmission data generation unit 13 generates a message (the above-mentioned type B Msg3) including the terminal ID, the flag, and the RRC control information.
- the transmission unit 14 transmits Msg3 to the base station 20.
- the receiving unit 11 receives Msg4 as an RRC connection setup message from the base station 20.
- Step S36 The control unit 15 performs processing for establishing an RRC connection between the MTC device 10 and the base station 20.
- the transmission data generation unit 13 generates an RRC connection setting completion message.
- the transmission unit 14 transmits an RRC connection setting completion message to the base station 20.
- Step S37 The transmission data generation unit 13 generates a message including user data.
- the transmission unit 14 transmits the generated message to the base station 20.
- Step S38 The transmission data generation unit 13 generates an RRC connection release message.
- the transmission unit 14 transmits an RRC connection release message to the base station 20.
- the control unit 15 performs processing for releasing the RRC connection. This returns to the idle state.
- the MTC device 10 can transmit MTC data to the base station 20 without RRC connection. Further, by providing a flag in Msg3, the MTC device 10 can selectively use data transmission performed without establishing an RRC connection and data transmission performed by establishing an RRC connection.
- the RRC protocol has a mobility management function and contributes to improvement of communication quality when the wireless communication apparatus moves.
- the MTC device 10 connected to the meter does not move.
- the MTC data transmitted by the MTC device 10 is relatively small in size. Therefore, in the second embodiment, it can be expected that the influence on the communication quality due to the absence of the RRC connection is small.
- FIG. 8 is a flowchart showing data reception processing.
- the process shown in FIG. 8 is executed by the base station 20. In the following, the process illustrated in FIG. 8 will be described in order of step number.
- the reception data processing unit 22 determines whether or not Msg3 has been received from the MTC device 10. If Msg3 is received, the process proceeds to step S42. If Msg3 has not been received, the process ends.
- Step S42 The reception data processing unit 22 determines whether or not the terminal ID included in Msg3 is registered in the terminal information storage unit 26. If registered, the process proceeds to step S43. If not registered, the process proceeds to step S46.
- Step S44 The reception data processing unit 22 extracts MTC data from the received Msg3.
- the wired communication unit 23 transfers the extracted MTC data to the MTC server 30.
- Step S45 The control unit 25 generates a data reception response message as Msg4.
- the transmission unit 24 transmits Msg4 to the MTC device 10. This completes the MTC data reception process.
- Step S46 The control unit 25 proceeds with the process of establishing the RRC connection, and generates an RRC connection setting message as Msg4.
- the transmission unit 24 transmits Msg4 to the MTC device 10.
- Step S47 The receiving unit 21 receives a message including user data from the MTC device 10.
- the reception data processing unit 22 extracts user data from the message.
- the wired communication unit 23 outputs the extracted user data to the network 40.
- Step S48 The receiving unit 21 receives an RRC connection release message from the MTC device 10.
- the reception data processing unit 22 extracts RRC control information included in the RRC connection release message.
- the control unit 25 performs processing for releasing the RRC connection.
- FIG. 9 is a sequence diagram showing a flow of data transmission without establishing an RRC connection. The process illustrated in FIG. 9 will be described along with step numbers.
- Step S51 The MTC device 10 transmits Msg1 to the base station 20.
- Step S52 The base station 20 transmits Msg2 to the MTC device 10.
- Step S53 The MTC device 10 transmits Msg3 including the MTC data (Msg3 of type A described above) to the base station 20.
- Step S54 The base station 20 checks the terminal ID and flag included in the received Msg3, and determines that MTC data is included in Msg3.
- Step S55 The base station 20 extracts MTC data from the received Msg3 and transfers it to the MTC server 30.
- Step S56 The base station 20 transmits a data reception response message to the MTC device 10 as Msg4. Thereby, the RRC connection is not established between the MTC device 10 and the base station 20, and the data transmission from the MTC device 10 to the base station 20 is completed.
- FIG. 10 is a sequence diagram showing a flow of data transmission for establishing an RRC connection. The processing illustrated in FIG. 10 will be described along with step numbers. (Step S61) The MTC device 10 transmits Msg1 to the base station 20.
- Step S62 The base station 20 transmits Msg2 to the MTC device 10.
- Step S63 The MTC device 10 transmits Msg3 including the RRC control information (Msg3 of type B described above) to the base station 20.
- Step S64 The base station 20 confirms the terminal ID and flag included in the received Msg3, and determines that the RRC control information is included in Msg3.
- Step S65 The base station 20 proceeds with the process of establishing the RRC connection, and transmits an RRC connection setup message to the MTC device 10 as Msg4.
- Step S66 The MTC device 10 performs processing for establishing an RRC connection, and transmits an RRC connection setting completion message to the base station 20.
- Step S67 The MTC device 10 transmits user data to the base station 20.
- the user data transmitted here may include MTC data.
- Step S ⁇ b> 68 When the received user data includes MTC data, the base station 20 transfers the MTC data to the MTC server 30.
- Step S69) The MTC device 10 transmits an RRC connection release message to the base station 20. Thereby, the data transmission from the MTC device 10 to the base station 20 is completed.
- MTC data can be transmitted from the MTC device 10 to the base station 20 without performing the process of establishing the RRC connection. Therefore, even when the MTC device 10 intermittently transmits MTC data having a relatively small size, the overhead of radio communication associated with establishment / release of the RRC connection is reduced, and the MTC data is efficiently transmitted. Is possible.
- the base station 20 since the base station 20 authenticates the terminal ID, an MTC device that can perform data transmission without establishing an RRC connection may be mixed with an MTC device that cannot. Is possible.
- Msg3 is used as a message for inserting MTC data.
- the message that can be used for transmitting the MTC data is not limited to Msg3, and other messages at a timing at which the MTC device 10 can transmit the RRC control information to the base station 20 can also be used.
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Abstract
Description
本発明の上記および他の目的、特徴および利点は本発明の例として好ましい実施の形態を表す添付の図面と関連した以下の説明により明らかになるであろう。
[第1の実施の形態]
図1は、第1の実施の形態の無線通信システムを示す図である。第1の実施の形態の無線通信システムは、無線通信装置1,2を有する。例えば、無線通信装置2を基地局として実装し、無線通信装置1を無線通信装置2にアクセスする加入者局として実装することが考えられる。無線通信装置1は、無線通信により無線通信装置2にデータを送信する。無線通信装置1,2は、適宜、無線通信の接続の確立および解放を行うことができる。
図2は、第2の実施の形態の無線通信システムを示す図である。第2の実施の形態の無線通信システムは、MTCデバイス10,10a、基地局20、MTCサーバ30およびネットワーク40を含む。基地局20は、ネットワーク40を介してMTCサーバ30とデータ通信を行うことができる。
受信部11は、アンテナを介して基地局20から受信した信号を無線信号処理し、高周波数の無線信号から低周波数のベースバンド信号にダウンコンバートする。そして、受信部11は、ベースバンド信号を復調および誤り訂正復号し、基地局20が送信したユーザデータおよび制御情報を抽出する。受信部11は、抽出したユーザデータをメータ管理部12に出力し、抽出した制御情報を制御部15に出力する。ユーザデータには、例えば、MTCサーバ30が送信した、メータを管理・操作するためのコマンドが含まれる。制御情報には、後述するランダムアクセス応答やRRC制御情報が含まれる。
受信部21は、アンテナを介してMTCデバイス10,10aから受信した信号を無線信号処理し、高周波数の無線信号から低周波数のベースバンド信号にダウンコンバートする。そして、ベースバンド信号を復調および誤り訂正復号し、MTCデバイス10,10aが送信したメッセージを受信データ処理部22に出力する。また、受信部21は、MTCデバイス10,10aが送信したランダムアクセスプリアンブルを検出する。
(ステップS11)MTCデバイス10は、基地局20にランダムアクセスプリアンブルを送信する。送信されるランダムアクセスプリアンブルは、予め定義された複数の信号系列の候補から選択されたものである。ステップS11で送信されるメッセージは、メッセージ1(Msg1)と呼ばれることがある。なお、Msg1には競合、すなわち、複数の無線通信装置が同一の信号系列を同一タイミングで送信することが発生し得る。
(ステップS16)MTCデバイス10は、基地局20との間にRRC接続が確立されると、端末登録要求メッセージを基地局20に送信する。この端末登録要求メッセージには、MTCデバイス10の端末IDが含まれている。
(ステップS18)基地局20は、ネットワーク40経由でMTCサーバ30に、端末登録要求メッセージを送信する。この端末登録要求メッセージには、MTCデバイス10の端末IDが含まれている。
(ステップS20)MTCサーバ30は、端末登録要求メッセージに対する応答として基地局20に、端末登録完了メッセージを送信する。
(ステップS22)MTCデバイス10は、基地局20から端末登録完了メッセージを受信すると、RRC接続解放メッセージを基地局20に送信し、RRC接続を解放する処理を行う。基地局20は、MTCデバイス10からRRC接続解放メッセージを受信すると、RRC接続を解放する処理を行う。
(ステップS31)制御部15は、基地局20に送信するユーザデータ(MTCデータを含む)があるか否か判断する。送信するユーザデータがある場合、処理をステップS32に進める。送信するユーザデータがない場合、処理を終了する。
(ステップS38)送信データ生成部13は、RRC接続解放メッセージを生成する。送信部14は、RRC接続解放メッセージを基地局20に送信する。制御部15は、RRC接続を解放する処理を行う。これにより、アイドル状態に戻る。
(ステップS41)受信データ処理部22は、MTCデバイス10からMsg3が受信されたか否か判断する。Msg3が受信された場合、処理をステップS42に進める。Msg3が受信されていない場合、処理を終了する。
(ステップS45)制御部25は、Msg4としてデータ受信応答メッセージを生成する。送信部24は、MTCデバイス10にMsg4を送信する。これにより、MTCデータの受信処理が終了する。
(ステップS51)MTCデバイス10は、Msg1を基地局20に送信する。
(ステップS53)MTCデバイス10は、MTCデータを含むMsg3(前述のタイプAのMsg3)を基地局20に送信する。
(ステップS55)基地局20は、受信したMsg3からMTCデータを抽出し、MTCサーバ30に転送する。
(ステップS61)MTCデバイス10は、Msg1を基地局20に送信する。
(ステップS63)MTCデバイス10は、RRC制御情報を含むMsg3(前述のタイプBのMsg3)を基地局20に送信する。
(ステップS65)基地局20は、RRC接続を確立する処理を進め、Msg4としてRRC接続設定メッセージをMTCデバイス10に送信する。
(ステップS67)MTCデバイス10は、ユーザデータを基地局20に送信する。ここで送信されるユーザデータには、MTCデータが含まれていてもよい。
(ステップS69)MTCデバイス10は、RRC接続解放メッセージを基地局20に送信する。これにより、MTCデバイス10から基地局20へのデータ送信が終了する。
1a 制御部
1b 送信部
2a 受信部
2b データ処理部
Claims (9)
- 第1および第2の無線通信装置を含み、前記第1の無線通信装置が前記第2の無線通信装置にデータを送信する無線通信システムの無線通信方法であって、
前記第1の無線通信装置が、前記第2の無線通信装置との間に接続が確立されていないとき、接続を確立する処理に用いられる制御情報を送信できるタイミングで、前記制御情報と異なるデータを含むメッセージを前記第2の無線通信装置に送信し、
前記第2の無線通信装置が、前記第1の無線通信装置から、前記制御情報を前記第1の無線通信装置が送信できるタイミングで送信された前記メッセージを受信し、
前記第2の無線通信装置が、受信した前記メッセージに含まれるデータを抽出する、
ことを特徴とする無線通信方法。 - 前記第2の無線通信装置は、受信した前記メッセージから前記制御情報と異なるデータを抽出した場合は、前記接続を確立する処理を行わないことを特徴とする請求の範囲第1項記載の無線通信方法。
- 前記第1の無線通信装置は、前記制御情報に代えて、前記制御情報と異なるデータを前記メッセージに挿入することを特徴とする請求の範囲第1項記載の無線通信方法。
- 前記メッセージは、前記制御情報と異なるデータの有無を示すフラグ情報を含み、
前記第2の無線通信装置は、前記フラグ情報に基づいて、前記メッセージに前記制御情報と異なるデータが含まれると判断すると、前記制御情報と異なるデータを抽出する、
ことを特徴とする請求の範囲第1項記載の無線通信方法。 - 前記メッセージは、送信元の無線通信装置を示す送信元情報を含み、
前記第2の無線通信装置は、前記送信元情報によって示される無線通信装置が自装置に登録されているときのみ、前記メッセージから前記制御情報と異なるデータを抽出する、
ことを特徴とする請求の範囲第1項記載の無線通信方法。 - 前記メッセージは、前記第1の無線通信装置が前記第2の無線通信装置に対してランダムアクセスを行った後、接続が確立される前に送信されるメッセージであることを特徴とする請求の範囲第1項記載の無線通信方法。
- 他の無線通信装置にデータを送信する無線通信装置であって、
前記他の無線通信装置との間に接続が確立されていないとき、接続を確立する処理に用いられる制御情報を前記他の無線通信装置に送信できるタイミングを判断する制御部と、
前記制御部が判断したタイミングで、前記制御情報と異なるデータを含むメッセージを前記他の無線通信装置に送信する送信部と、
を有することを特徴とする無線通信装置。 - 他の無線通信装置からデータを受信する無線通信装置であって、
自装置との間に接続が確立されていない前記他の無線通信装置から、接続を確立する処理に用いられる制御情報を前記他の無線通信装置が送信できるタイミングで送信された、前記制御情報と異なるデータを含むメッセージを受信する受信部と、
前記受信部が受信した前記メッセージに含まれるデータを抽出するデータ処理部と、
を有することを特徴とする無線通信装置。 - 第1および第2の無線通信装置を含み、前記第1の無線通信装置が前記第2の無線通信装置にデータを送信する無線通信システムであって、
前記第1の無線通信装置は、前記第2の無線通信装置との間に接続が確立されていないとき、接続を確立する処理に用いられる制御情報を前記第2の無線通信装置に送信できるタイミングを判断する制御部と、前記制御部が判断したタイミングで、前記制御情報と異なるデータを含むメッセージを前記第2の無線通信装置に送信する送信部と、を有し、
前記第2の無線通信装置は、前記第1の無線通信装置から、前記制御情報を前記第1の無線通信装置が送信できるタイミングで送信された前記メッセージを受信する受信部と、前記受信部が受信した前記メッセージに含まれるデータを抽出するデータ処理部と、を有する、
ことを特徴とする無線通信システム。
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JP2012520233A JP5545368B2 (ja) | 2010-06-18 | 2010-06-18 | 無線通信方法、無線通信装置および無線通信システム |
CA2801357A CA2801357C (en) | 2010-06-18 | 2010-06-18 | Radio communication method, radio communication apparatus, and radio communication system |
EP10853257.3A EP2584801A4 (en) | 2010-06-18 | 2010-06-18 | WIRELESS COMMUNICATION METHOD, WIRELESS COMMUNICATION APPARATUS, AND WIRELESS COMMUNICATION SYSTEM |
KR1020127032572A KR101592630B1 (ko) | 2010-06-18 | 2010-06-18 | 무선 통신 방법, 무선 통신 장치 및 무선 통신 시스템 |
CN201080067324.7A CN102934469B (zh) | 2010-06-18 | 2010-06-18 | 无线通信方法、无线通信装置以及无线通信系统 |
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US10075979B2 (en) | 2012-06-27 | 2018-09-11 | Lg Electronics Inc. | Method and apparatus for performing random access procedure in wireless communication system |
WO2014003436A1 (en) | 2012-06-27 | 2014-01-03 | Lg Electronics Inc. | Method and apparatus for performing random access procedure in wireless communication system |
US10397959B2 (en) | 2012-06-27 | 2019-08-27 | Lg Electronics Inc. | Method and apparatus for performing random access procedure in wireless communication system |
CN107872308A (zh) * | 2013-02-28 | 2018-04-03 | 华为技术有限公司 | 数据发送方法、接收方法及设备 |
US10327253B2 (en) | 2013-02-28 | 2019-06-18 | Huawei Technologies Co., Ltd. | Data sending and receiving method and device |
CN107872308B (zh) * | 2013-02-28 | 2020-06-09 | 华为技术有限公司 | 数据发送方法、接收方法及设备 |
JP2015220740A (ja) * | 2014-05-21 | 2015-12-07 | 富士通株式会社 | 通信システム、静止端末及び基地局 |
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CN102934469A (zh) | 2013-02-13 |
US20130095767A1 (en) | 2013-04-18 |
CA2801357A1 (en) | 2011-12-22 |
EP2584801A1 (en) | 2013-04-24 |
JP5545368B2 (ja) | 2014-07-09 |
KR20130018417A (ko) | 2013-02-21 |
CA2801357C (en) | 2015-09-29 |
US8995928B2 (en) | 2015-03-31 |
JPWO2011158377A1 (ja) | 2013-08-15 |
KR101592630B1 (ko) | 2016-02-05 |
CN102934469B (zh) | 2015-04-15 |
EP2584801A4 (en) | 2013-08-14 |
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