WO2011148820A1 - 無線通信装置および無線通信方法 - Google Patents
無線通信装置および無線通信方法 Download PDFInfo
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- WO2011148820A1 WO2011148820A1 PCT/JP2011/061254 JP2011061254W WO2011148820A1 WO 2011148820 A1 WO2011148820 A1 WO 2011148820A1 JP 2011061254 W JP2011061254 W JP 2011061254W WO 2011148820 A1 WO2011148820 A1 WO 2011148820A1
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- wireless communication
- resource block
- mtc
- reference signal
- transmission area
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/003—Arrangements to increase tolerance to errors in transmission or reception timing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present disclosure relates to a wireless communication device and a wireless communication method.
- eNodeB macrocell base station
- HeNodeB Home eNodeB, femtocell base station, mobile phone small base station
- RHH remote radio head
- the user terminal synchronizes the frame with the base station based on a synchronization signal transmitted from the base station, and then the oscillator inside the user terminal is connected to the oscillator of the base station with high accuracy. Synchronize. And a user terminal receives the signal transmitted from a base station periodically, and makes the oscillator of the base station of the oscillator inside a user terminal track.
- each user terminal performs time adjustment according to the distance between the base station and the user terminal, which is called Timing Advance. Do. Specifically, Timing Advance is performed during a random access procedure in which a user terminal transmits a preamble toward a random access window. The Timing Advance value can be obtained from the relationship between the arrival time of the preamble at the base station and the random access window.
- MTC Machine Type Communications
- the MTC terminal has characteristics such as Time Controlled, Online Small Data Transmissions, and the like. That is, the MTC terminal is expected to spend a lot of time in the idle mode and receive signals from the base station in bursts or transmit a small amount of information to the base station. Also, since MTC terminals are required to have low power consumption, it is desirable to shorten the burst transmission / reception time as much as possible. Further, this bursty transmission / reception is considered to be performed in a very long cycle of once per several hours or once every few days, not in the order of several ms or several tens of ms when the current LTE terminal receives the paging channel. It is done.
- the present disclosure is to propose a new and improved wireless communication apparatus and wireless communication method capable of reducing power consumption and suppressing a decrease in communication accuracy.
- a non-transmission area set at a boundary in the time direction or frequency direction with an adjacent resource block there is provided a wireless communication apparatus including a wireless communication unit that does not perform transmission but performs transmission in another area in the resource block.
- the wireless communication apparatus may further include a control unit that sets the non-transmission area in the resource block.
- the control unit sets the non-transmission area on the boundary with at least one of the adjacent resource blocks on the time axis and the adjacent resource block on the upper or lower side on the frequency axis. It may be set.
- the control unit may set the non-transmission area wider in the resource block as the elapsed time from the synchronization process with the communication partner is longer.
- the radio communication unit may make the length of the guard interval part for the data part in each Ofdm symbol constituting the resource block longer than the length defined by LTE.
- the wireless communication unit may make the guard interval part in each Ofdm symbol longer than the data part.
- the wireless communication unit may use a plurality of Ofdm symbol transmission areas as one guard interval part and one data part.
- the wireless communication unit may make the guard interval part longer than the data part.
- resource blocks allocated from a plurality of resource blocks arranged in a grid pattern on the time axis and the frequency axis there is nothing set at the boundary in the time direction or the frequency direction with an adjacent resource block.
- a wireless communication method in which transmission is not performed in a transmission area but transmission is performed in another area in the resource block.
- the radio communication unit includes a radio communication unit that transmits a radio signal in a resource block allocated from a plurality of resource blocks arranged in a grid on the time axis and the frequency axis, and the radio communication unit includes the radio communication unit,
- a radio communication apparatus is provided that transmits a reference signal at the head of the resource block at a frequency used for transmitting a reference signal in the resource block, and transmits another radio signal after transmitting the reference signal.
- the wireless communication unit may transmit a reference signal at all frequencies used for transmission in the resource block.
- the resource block is allocated from a plurality of resource blocks arranged in a lattice pattern on the time axis and the frequency axis, and the frequency used for transmitting the reference signal in the resource block,
- a wireless communication method including transmitting a reference signal at the head of a resource block and transmitting another wireless signal after transmitting the reference signal.
- the wireless communication device and the wireless communication method according to the present disclosure it is possible to suppress a decrease in communication accuracy while reducing power consumption.
- 6 is an explanatory diagram illustrating an arrangement example of reference signals according to an embodiment of the present disclosure. It is explanatory drawing which showed an example of the guard interval. It is explanatory drawing which showed an example of the guard interval. It is explanatory drawing which showed an example of the guard interval. 5 is a flowchart illustrating an operation of an eNodeB according to an embodiment of the present disclosure. It is explanatory drawing which showed the structure of the MTC terminal by embodiment of this indication.
- a plurality of constituent elements having substantially the same functional configuration may be distinguished by adding different alphabets after the same reference numeral.
- a plurality of configurations having substantially the same functional configuration are distinguished as necessary as MTC terminals 20A, 20B, and 20C.
- MTC terminals 20A, 20B, and 20C are simply referred to as the MTC terminal 20.
- FIG. 1 is an explanatory diagram showing a configuration example of the wireless communication system 1.
- the radio communication system 1 includes an eNodeB 10, a core management network including an MME (Mobility Management Entity) 12, an S-GW (Serving Gateway) 14, and a PDN (Packet Data Network) -GW 16, and an MTC.
- the terminal 20 and the MTC server 30 are provided.
- the embodiment of the present disclosure can be applied to wireless communication apparatuses such as the eNodeB 10 and the MTC terminal 20 illustrated in FIG.
- the eNodeB 10 and the MTC terminal 20 are only examples of wireless communication devices, and the embodiments of the present disclosure can be applied to various other wireless communication devices.
- Examples of other wireless communication devices include a user terminal (UE: User Equipment), a relay node that relays communication between the user terminal (MTC terminal 20) and the eNodeB 10, and a Home eNodeB that is a small home base station. .
- the eNodeB 10 is a radio base station that communicates with the MTC terminal 20. Although only one eNodeB 10 is shown in FIG. 1, a large number of eNodeBs are actually connected to the core network. Moreover, although description is abbreviate
- the MME 12 is a device that controls the setting, release, and handover of a data communication session.
- the MME 12 is connected to the eNodeB 10 via an interface called X2.
- the S-GW 14 is a device that performs routing and transfer of user data.
- the PDN-GW 16 functions as a connection point with the IP service network, and transfers user data to and from the IP service network.
- the MTC terminal 20 is a terminal specialized for an application for MTC being studied in 3GPP, and performs radio communication with the eNodeB 10 according to the application. Further, the MTC terminal 20 performs bidirectional communication with the MTC server 30 via the core network. The user executes a predetermined application by accessing the MTC server 30. The user basically does not access the MTC terminal 20 directly.
- the MTC terminal 20 will be described in detail in “1-4. MTC terminal”.
- FIG. 2 is an explanatory diagram showing a 4G frame format.
- a 10 ms radio frame is composed of ten 1 ms subframes # 0 to # 9.
- Each subframe of 1 ms is composed of two 0.5 ms slots.
- each 0.5 ms slot is composed of 7 Ofdm symbols.
- a synchronization signal used for frame synchronization by the user terminal is transmitted using the Ofdm symbol shaded in FIG. More specifically, the secondary synchronization signal is used for the fifth Ofdm symbol of subframe # 0, the primary synchronization signal is used for the sixth Ofdm symbol of subframe # 0, the secondary synchronization signal is used for the fifth Ofdm symbol of subframe # 5, and the fifth synchronization symbol of subframe # 5 is used. In 6Ofdm symbols, a primary synchronization signal is transmitted.
- the user terminal acquires a 5 ms period using the primary synchronization signal and simultaneously detects a cell number group corresponding to the current location from the three cell number groups. Thereafter, the user terminal acquires a radio frame period (10 ms period) using the secondary synchronization signal.
- a ZadoffChu sequence is used as the code sequence of the synchronization signal. Since 168 types of encoded sequences are used for the cell numbers in the cell number group and two types of encoded sequences are used to obtain a radio frame period, 336 types of encoded sequences are prepared. Based on the combination of the secondary synchronization signal transmitted in subframe # 0 and the secondary synchronization signal transmitted in subframe # 5, the user terminal determines whether the received subframe is subframe # 0 or subframe # 5 Can be judged.
- the user terminal After performing the frame synchronization as described above, the user terminal synchronizes the oscillator inside the user terminal with the oscillator of the eNodeB 10 with high accuracy. And a user terminal receives the signal transmitted from a base station periodically, and makes the oscillator of the base station of the oscillator inside a user terminal track. If there is a difference between the oscillator inside the user terminal and the oscillator of the base station, it becomes impossible to receive and transmit at an accurate frequency and time. Therefore, the accuracy of the oscillator inside the user terminal is important.
- Timing Advance The 4G user terminal performs time adjustment according to the distance between the eNodeB 10 and the user terminal, called Timing Advance, so that the radio signals transmitted from the plurality of user terminals are simultaneously received by the eNodeB 10. Specifically, Timing Advance is performed during a random access procedure in which a user terminal transmits a preamble toward a random access window. The Timing Advance value can be acquired from the relationship between the arrival time of the preamble to the eNodeB 10 and the random access window.
- the MTC terminal 20 performs the same Timing Advance as that of the user terminal and acquires the Timing Advance value.
- the MTC terminal 20 is a terminal specialized for an application for MTC which is being studied in 3GPP.
- An example of an application for MTC is shown below.
- the MTC terminal 20 may be an electrocardiogram measuring device corresponding to the above “4. Health”.
- the MTC server 30 requests the report of the electrocardiogram measurement result from the MTC terminal 20, and the measurement result of the electrocardiogram is received from the MTC terminal 20. Reported to the MTC server 30.
- the MTC terminal 20 may be a vending machine corresponding to the above “3. Payment”.
- the MTC server 30 requests the MTC terminal 20 to report the sales status, and the MTC terminal 20 reports the sales status to the MTC server 30.
- MTC terminal 20 The characteristics of such an MTC terminal 20 are shown below. Note that the MTC terminal 20 need not have all the following features.
- the MTC terminal 20 moves less, connects to the eNodeB 10 at a low frequency, performs a small amount of data communication, and returns to the idle mode again. In addition, a certain amount of delay is allowed for data communication. Further, the MTC terminal 20 is required to have ultra-low power consumption (13. Extra Low Power Consumption).
- the number of MTC terminals 20 existing in the future is predicted.
- about 2.7 billion people use cellular in the world population of over 6 billion.
- about 50 million machines use cellular as the MTC terminal 20.
- the MTC terminal 20 is not widespread at the present time, there is a possibility that the MTC terminal 20 of the order of 100 trillion will be accommodated by cellular in the world in the future. As a result, an enormous number of MTC terminals 20 are expected to be accommodated in each eNodeB 10.
- the MTC terminal 20 having characteristics such as Time Controlled and Online Small Data Transmissions.
- Such an MTC terminal 20 is expected to spend a lot of time in the idle mode, receive signals from the eNodeB 10 in a burst manner, or transmit a small amount of information to the eNodeB 10. Further, since the MTC terminal 20 is required to have low power consumption, it is desired to shorten the burst transmission / reception time as much as possible.
- this bursty transmission / reception is considered to be performed in a very long cycle of once per several hours or once every few days, not in the order of several ms or several tens of ms when the current LTE terminal receives the paging channel. It is done.
- FIG. 3 is an explanatory diagram showing resource blocks. As shown in FIG. 3, the resource blocks are arranged in a lattice shape in the frequency direction and the time direction. Each resource block is composed of 12 subcarriers ⁇ 7Ofdm symbols. Further, a guard interval is added to the head of each resource element composed of 1 subcarrier ⁇ 1Ofdm symbol.
- the eNodeB 10 can perform resource allocation in units of this resource block.
- FIG. 4 is an explanatory diagram showing a problem based on errors such as an oscillator inside the MTC terminal 20 and frame synchronization. For example, consider a case where resource blocks RB1 to RB3 are allocated for the uplink of MTC terminal 20A and resource block RB4 is allocated for the uplink of MTC terminal 20B. Furthermore, it is assumed that the oscillator inside the MTC terminal 20B has an error.
- the radio signal transmitted from the MTC terminal 20B to the eNodeB 10 in the resource block RB4 reaches the eNodeB 10 at a time and frequency that do not match the original resource block RB4, as shown in FIG.
- the radio signal transmitted from the MTC terminal 20B interferes with the radio signal transmitted from the MTC terminal 20A in the resource blocks RB1 to RB3 at the eNodeB 10.
- Such interference between resource blocks causes reception failure. Similar problems occur in the downlink.
- the embodiment of the present disclosure has been created with the above circumstances in mind. According to the embodiment of the present disclosure, it is possible to suppress the interference between resource blocks and the accompanying decrease in communication accuracy while reducing power consumption. Hereinafter, such an embodiment of the present disclosure will be described in detail.
- FIG. 5 is an explanatory diagram illustrating a configuration of the eNodeB 10 according to the embodiment of the present disclosure. As illustrated in FIG. 5, the eNodeB 10 includes a wireless communication unit 110, a control unit 120, and an upper layer 130.
- the wireless communication unit 110 has a function as a reception unit that receives control signals and data from the MTC terminal 20 and a transmission unit that transmits control signals and data to the MTC terminal 20.
- the wireless communication unit 210 performs wireless signal processing such as modulation / demodulation, signal mapping, demapping, and interleaving, and antenna signal processing. Normal data transmitted / received between the wireless communication unit 110 and the user terminal and MTC data transmitted / received between the wireless communication unit 110 and the MTC terminal 20 are input / output between the wireless communication unit 110 and the upper layer 130. .
- the wireless communication unit 110 also includes an MTC reference signal insertion unit 112, an MTC guard processing unit 114, and a channel estimation unit 116.
- the channel estimation unit 116 estimates the channel condition between the eNodeB 10 and the MTC terminal 20 based on the reference signal received from the MTC terminal 20.
- the MTC reference signal insertion unit 112 and the MTC guard processing unit 114 add the MTC reference signal and the MTC guard interval when the communication partner is the MTC terminal 20.
- the MTC reference signal and the MTC guard interval will be described in detail later.
- the control unit 120 is configured to control the overall communication of the eNodeB 10.
- the control unit 120 includes a scheduler 122 and a non-transmission area setting unit 124.
- the scheduler 122 allocates resource blocks to the MTC terminals 20 belonging to the eNodeB 10.
- the MTC terminal 20 performs uplink communication or downlink communication using the resource block allocated by the scheduler 122.
- the non-transmission area setting unit 124 sets the non-transmission area in the resource block allocated for downlink by the scheduler 122.
- the wireless communication unit 110 does not transmit a radio signal in the non-transmission area set by the non-transmission area setting unit 124, and transmits a radio signal only in other areas.
- the non-transmission area will be specifically described.
- Non-transmission area setting As described above with reference to FIG. 4, in both downlink communication and uplink communication, interference between resource blocks occurs due to errors such as an oscillator inside the MTC terminal 20 and frame synchronization. . Therefore, the non-transmission area setting unit 124 sets the non-transmission area at the boundary of at least one of the time direction and the frequency direction with the adjacent resource block in the resource block allocated for the downlink by the scheduler 122.
- FIG. 6 is an explanatory diagram showing an example of setting a non-transmission area.
- a non-transmission area is set at the boundary between each resource block and the adjacent resource block on the front side on the time axis and the boundary between the adjacent resource block on the lower side on the frequency axis.
- the resource block 3 includes one resource element at the boundary with the previous adjacent resource block RB1 on the time axis and the lower adjacent resource block RB4 on the frequency axis.
- the transmission area is set.
- the MTC terminal 20 receives only the radio signal transmitted from the eNodeB 10 in the resource block RB2. Can do.
- the resource elements set in the non-transmission area by the non-transmission area setting unit 124 are not limited to the example shown in FIG.
- the non-transmission area setting unit 124 may set a non-transmission area at the boundary between all resource blocks in the resource block.
- the non-transmission area setting unit 124 may set a plurality of resource elements at each boundary as a non-transmission area.
- the non-transmission area setting unit 124 may set different non-transmission areas for each resource block or for each MTC terminal 20 as a transmission destination.
- FIG. 7 is an explanatory diagram showing another setting example of the non-transmission area.
- the resource block RB1 shown in FIG. 7 includes two resource elements at the boundary with the adjacent resource block on the front side in the time direction, one resource element at the boundary with the adjacent resource block RB3 on the rear side, and the lower side in the frequency direction.
- a non-transmission area for one resource element is set at the boundary with the adjacent resource block RB2.
- the resource block RB2 has one resource element at the boundary with the previous adjacent resource block in the time direction, four resource elements at the boundary with the lower adjacent resource block RB in the frequency direction, and the upper adjacent in the frequency direction.
- a non-transmission area for three resource elements is set at the boundary with the resource block RB1.
- the non-transmission area setting unit 124 can set a different non-transmission area for each resource block or for each MTC terminal 20 as a transmission destination.
- it is effective to set the non-transmission area widely in the MTC terminal 20 having a large error such as an oscillator or frame synchronization. Therefore, the non-transmission area setting unit 124 may estimate the magnitude of the error of the MTC terminal 20 and set the non-transmission area according to the magnitude of the error. With this configuration, it is possible to prevent throughput from being lowered by setting a non-transmission area that is larger than necessary.
- the non-transmission area setting unit 124 may estimate the magnitude of the error of the MTC terminal 20 from, for example, the elapsed time from frame synchronization by the MTC terminal 20, the elapsed time from Timing Advance, the reception success rate, and the like. .
- the MTC reference signal insertion unit 112 inserts a reference signal into a resource block allocated for downlink to the MTC terminal 20.
- a reference signal Prior to a detailed description of the MTC reference signal insertion unit 112, an arrangement position of a normal reference signal having a user terminal as a transmission destination will be described with reference to FIG.
- FIG. 8 is an explanatory diagram showing a normal arrangement position of the reference signal.
- reference signals are inserted in a distributed manner into a plurality of resource elements in a resource block.
- the user terminal obtains channel information for receiving data by receiving this reference signal over one or more resource blocks and performing interpolation in the frequency direction and the time direction.
- a reference signal is similarly inserted in the uplink.
- each MTC terminal 20 uses a resource block having an error in the frequency direction and the time direction, so it is difficult for the eNodeB 10 to acquire channel information over a sufficient time based on the reference signal. is there.
- the MTC reference signal insertion unit 112 intensively inserts reference signals at the head of resource blocks allocated for downlink to the MTC terminal 20.
- a specific description will be given with reference to FIG.
- FIG. 9 is an explanatory diagram illustrating an arrangement example of reference signals according to an embodiment of the present disclosure.
- the MTC reference signal insertion unit 112 inserts a reference signal at the head of all frequencies used for transmission in each resource block.
- the MTC reference signal insertion unit 112 inserts a reference signal immediately after the non-transmission area, and the non-transmission area is not set. The reference signal is inserted at the head of the resource block.
- the MTC reference signal insertion unit 112 inserts the reference signal at all frequencies at all frequencies.
- the reference signal may be inserted at a part of the frequency instead of the entire frequency.
- the MTC guard processing unit 114 adds a guard interval to an Ofdm symbol whose destination is the MTC terminal 20 and cuts out data from the Ofdm symbol received from the MTC terminal 20.
- a normal Ofdm symbol guard interval with the user terminal as the transmission destination will be described.
- the Ofdm symbol is composed of a guard interval and data, as shown in FIG.
- the normal guard interval is designed to be longer than the delay time of the reflected wave with the latest arrival time in order to suppress the influence of multipath. It is known that data can be correctly decoded if a signal of a predetermined length can be extracted from the Ofdm symbol comprising the guard interval and data.
- both the eNodeB 10 and the MTC terminal 20 accurately extract a signal from the received Ofdm symbol in a normal guard interval. It is difficult to do.
- the MTC guard processing unit 114 makes the guard interval longer than the normal length defined in LTE. For example, as shown in the lower part of FIG. 10, the MTC guard processing unit 114 makes the length of the guard interval longer than the data. With such a configuration, since the allowable amount of error related to the signal cut-out position in the MTC terminal 20 is greatly increased, it is possible to improve the reception success rate.
- the ratio between the guard interval length and the data length may be set to 80%: 20%.
- the MTC terminal 20 cuts out a signal from the center of the Ofdm symbol as shown in FIG. 11, so that the frame synchronization error of the MTC terminal 20 is ⁇ 40% to 40% of the Ofdm symbol length. If it is within the range, it is possible to correctly decode the data. In this way, in addition to setting the non-transmission area, by extending the guard interval, interference between resource blocks and interference between Ofdm symbols can be prevented.
- the MTC guard processing unit 114 may estimate the size of the error of the MTC terminal 20 and set the length of the guard interval according to the size of the error, similarly to the width of the non-transmission area. . With this configuration, it is possible to prevent throughput from being lowered by making the guard interval longer than necessary. Further, as in the modification shown in FIG. 12, the transmission areas of a plurality of Ofdm symbols may be used as one guard interval part and one data part. According to such a configuration, the guard interval can be further increased.
- FIG. 13 is a flowchart illustrating an operation of the eNodeB 10 according to the embodiment of the present disclosure.
- the scheduler 122 of the eNodeB 10 performs resource block scheduling for each MTC terminal 20 (S310).
- the non-transmission area setting unit 124 sets a non-transmission area in the resource block allocated for downlink by the scheduler 122 (S320).
- the non-transmission area setting unit 124 sets a non-transmission area at the boundary of at least one of the time direction and the frequency direction with the adjacent resource block in the resource block allocated for downlink by the scheduler 122.
- the MTC reference signal insertion unit 112 inserts a reference signal at the head of the resource block, and the MTC guard processing unit 114 adds a longer guard interval defined in LTE to each Ofdm symbol (S330). Thereafter, the wireless communication unit 110 transmits the signal obtained in S330 in an area other than the non-transmission area (S340).
- Configuration of MTC terminal> The configuration and operation of the eNodeB 10 according to the embodiment of the present disclosure have been described above. Next, the MTC terminal 20 according to the embodiment of the present disclosure will be described. Similar to the eNodeB 10, the MTC terminal 20 according to the embodiment of the present disclosure does not transmit in the non-transmission area, transmits the reference signal at the head of the resource block, and lengthens the guard interval, thereby interfering between resource blocks. And preventing interference between Ofdm. Hereinafter, the configuration of the MTC terminal 20 will be specifically described.
- FIG. 14 is an explanatory diagram showing a configuration of the MTC terminal 20 according to the embodiment of the present disclosure.
- the MTC terminal 20 according to the embodiment of the present disclosure includes a wireless communication unit 210, a control unit 220, and an upper layer 230.
- the wireless communication unit 210 has a function as a receiving unit that receives control signals and data from the eNodeB 10 and a transmitting unit that transmits control signals and data to the eNodeB 10. Specifically, the wireless communication unit 210 performs wireless signal processing such as modulation / demodulation, signal mapping, demapping, and interleaving, and antenna signal processing. MTC data transmitted and received between the radio communication unit 210 and the eNodeB 10 is input / output between the radio communication unit 210 and the upper layer 230.
- the wireless communication unit 210 includes an MTC reference signal insertion unit 212, an MTC guard processing unit 214, and a channel estimation unit 216.
- the channel estimation unit 216 estimates the channel condition between the eNodeB 10 and the MTC terminal 20 based on the reference signal received from the eNodeB 10.
- the MTC reference signal insertion unit 112 has substantially the same configuration as the MTC reference signal insertion unit 212 of the eNodeB 10. For example, the MTC reference signal insertion unit 112 inserts a reference signal at the beginning of all or some of the frequencies of the uplink resource block as shown in FIG. According to such a configuration, it is expected that the time required for the eNodeB 10 on the uplink receiving side to acquire the channel information is shortened.
- the MTC guard processing unit 214 has substantially the same configuration as the MTC guard processing unit 114 of the eNodeB 10. For example, the MTC guard processing unit 214 makes the length of the guard interval longer than the data as shown in FIG. With such a configuration, the tolerance for frame synchronization errors of the MTC terminal 20 is greatly increased, so that the reception success rate by the eNodeB 10 can be improved.
- the control unit 220 is configured to control the overall communication of the MTC terminal 20.
- the control unit 220 controls uplink communication and downlink communication by the MTC terminal 20 according to scheduling information received from the eNodeB 10, for example.
- control unit 220 causes the radio communication unit 210 to transmit a radio signal in an area other than the non-transmission area. Control. Note that the radio communication unit 210 performs reception processing on the entire allocated resource block in the downlink.
- control unit 220 may have substantially the same function as the non-transmission area setting unit 124 of the eNodeB 10. That is, the control unit 220 may set a non-transmission area in the uplink resource block allocated by the eNodeB 10.
- the control unit 220 may estimate the magnitude of an error such as the frequency or time of the MTC terminal 20 and set a non-transmission area according to the magnitude of the error. For example, the control unit 220 may set a wider non-transmission area as the error of the MTC terminal 20 is larger, and may set a smaller non-transmission area as the error of the MTC terminal 20 is smaller. With this configuration, it is possible to prevent throughput from being lowered by setting a non-transmission area that is larger than necessary.
- the control unit 120 may estimate the magnitude of the error of the MTC terminal 20 from, for example, the elapsed time from frame synchronization by the MTC terminal 20, the elapsed time from Timing Advance, the reception success rate, and the like.
- interference between resource blocks can be prevented by setting a non-transmission area even when there is an error in frame synchronization or frequency of the MTC terminal 20. .
- it is expected that the time required for the reception side apparatus to acquire the channel information is shortened by intensively inserting the reference signal at the head of the resource block.
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Abstract
Description
装置が提供される。
1.無線通信システムの概略
1-1.無線通信システムの構成
1-2.フレーム同期
1-3.Timing Advance
1-4.MTC端末
2.eNodeBの構成
(無送信領域の設定)
(MTC用リファレンス信号)
(MTC用ガードインターバル)
3.eNodeBの動作
4.MTC端末の構成
5.まとめ
現在、3GPPにおいて4Gの無線通信システムの規格化が進められている。本開示の実施形態は、一例としてこの4Gの無線通信システムに適用することができるので、まず、4Gの無線通信システムの概略を説明する。
図1は、無線通信システム1の構成例を示した説明図である。図1に示したように、無線通信システム1は、eNodeB10と、MME(Mobility Management Entity)12、S-GW(Serving Gateway)14、およびPDN(Packet Data Network)-GW16を含むコアネットワークと、MTC端末20と、MTCサーバ30と、を備える。
上記のeNodeB10およびMTC端末20は、詳細については決定されていないが、eNodeB10およびユーザ端末間の通信に準ずる形で無線通信を行うことが予想される。そこで、以下では、eNodeB10およびユーザ端末間で共有される無線フレーム、およびフレーム同期について説明する。以下で説明する内容は、eNodeB10およびMTC端末20間の通信に援用可能である。
4Gのユーザ端末は、複数のユーザ端末から送信された無線信号がeNodeB10で同時に受信されるようにするために、Timing Advanceと呼ばれる、eNodeB10およびユーザ端末間の距離に応じた時間調整を行う。具体的には、Timing Advanceは、ユーザ端末がランダムアクセスウィンドウに向けてプリアンブルを送信するランダムアクセスの手続き中に行われる。上記のプリアンブルのeNodeB10への到達時刻と上記ランダムアクセスウィンドウとの関係からTiming Advance値を取得することが可能である。
MTC端末20は、上述したように、3GPPにおいて検討されているMTC用のアプリケーションに特化した端末である。以下に、MTC用のアプリケーションの一例を示す。
2.Trcking&Tracing
3.Payment
4.Health
5.Remote Maintenace/Control
6.Metering
7.Consumer Devices
2.Time Controlled
3.Time Tolerant
4.Packet Switched Only
5.Online Small Data Transmissions
6.Offline Small Data Transmission
7.Mobile Originated Only
8.Infrequent Mobile Terminated
9.MTC Monitoring
10.Offline Indication
11.Jamming Indication
12.Priority Alarm Message
13.Extra Low Power Consumption
14.Secure Connection
15.Location Specific Triger
16.Group based MTC Features
上述したMTC端末20の特徴のうちで、Time Controlled、Online Small Data Transmissionsなどの特性を有するMTC端末20に着目する。このようなMTC端末20は、多くの時間をアイドルモードで過ごし、バースト的にeNodeB10から信号を受信する、またはeNodeB10に対して少量の情報を送信することが予想される。また、MTC端末20には低消費電力が求められるので、上記のバースト的な送受信の時間を極力短くすることが望まれる。さらに、このバースト的な送受信は、現状のLTE端末がページングチャネルを受信する数msや数10msというオーダーでなく、数時間に1回または数日に一回という非常に長い周期で行われると考えられる。
図5は、本開示の実施形態によるeNodeB10の構成を示した説明図である。図5に示したように、eNodeB10は、無線通信部110と、制御部120と、上位レイヤ130と、を備える。
上記で図4を参照して説明したように、ダウンリンク通信およびアップリンク通信のいずれにおいても、MTC端末20内部の発振機やフレーム同期などの誤差に起因してリソースブロック間の干渉が発生する。そこで、無送信領域設定部124は、スケジューラ122によりダウンリンク用に割り当てられたリソースブロックにおいて、隣接リソースブロックとの時間方向または周波数方向の少なくともいずれかの境界に無送信領域を設定する。
MTC用リファレンス信号挿入部112は、MTC端末20へのダウンリンク用に割り当てられたリソースブロックにリファレンス信号を挿入する。このMTC用リファレンス信号挿入部112の詳細な説明に先立ち、図8を参照してユーザ端末を送信先とする通常のリファレンス信号の配置位置を説明する。
MTC用ガード処理部114は、MTC端末20を送信先とするOfdmシンボルへのガードインターバルの付加、およびMTC端末20から受信されるOfdmシンボルからのデータの切り出しを行う。このMTC用ガード処理部114の詳細な説明に先立ち、ユーザ端末を送信先とする通常のOfdmシンボルのガードインターバルについて説明する。
以上、本開示の実施形態によるeNodeB10の構成を説明した。続いて、図13を参照し、本開示の実施形態によるeNodeB10の動作を説明する。
以上、本開示の実施形態によるeNodeB10の構成および動作を説明した。次に、本開示の実施形態によるMTC端末20について説明する。本開示の実施形態によるMTC端末20は、eNodeB10と同様に、無送信領域での送信を行わず、リファレンス信号をリソースブロックの先頭で送信し、ガードインターバルを長くすることにより、リソースブロック間の干渉およびOfdm間の干渉を防止する。以下、このようなMTC端末20の構成を具体的に説明する。
以上説明したように、本開示の実施形態によれば、MTC端末20のフレーム同期や周波数などに誤差がある場合でも、無送信領域を設定することによりリソースブロック間の干渉を防止することができる。また、本開示の実施形態によれば、ガードインターバルを長くすることにより、Ofdmシンボル間の干渉を防止することも可能である。したがって、フレーム同期や周波数を調整するためにMTC端末20が行う通信の頻度を抑えることにより、MTC端末20の消費電力を削減することができる。また、本開示の実施形態によれば、リファレンス信号をリソースブロックの先頭に集中的に挿入することにより、受信側の装置がチャネル情報の取得に要する時間を短縮することが期待される。
12 MME
14 S-GW
16 PDN-GW
20 MTC端末
30 MTCサーバ
110、210 無線通信部
112、212 MTC用リファレンス信号挿入部
114、214 MTC用ガード処理部
116、216 チャネル推定部
120、220 制御部
122 スケジューラ
124 無送信領域設定部
130、230 上位レイヤ
Claims (12)
- 時間軸および周波数軸上に格子状に配置された複数のリソースブロックから割り当てられたリソースブロックにおいて、隣接リソースブロックとの時間方向または周波数方向の境界に設定された無送信領域では送信を行わず、前記リソースブロックにおける他の領域で送信を行う無線通信部、を備える、無線通信装置。
- 前記無線通信装置は、前記リソースブロックにおいて前記無送信領域を設定する制御部をさらに備える、請求項1に記載の無線通信装置。
- 前記制御部は、時間軸上の前側または後側の隣接リソースブロックの少なくとも一方との境界、および、周波数軸上の上側または下側の隣接リソースブロックの少なくとも一方との境界に前記無送信領域を設定する、請求項2に記載の無線通信装置。
- 前記制御部は、通信相手との同期処理からの経過時間が長いほど、前記リソースブロックに前記無送信領域を広く設定する、請求項3に記載の無線通信装置。
- 前記無線通信部は、前記リソースブロックを構成する各Ofdmシンボルにおけるデータ部分に対するガードインターバル部分の長さを、LTEで定義される長さよりも長くする、請求項4に記載の無線通信装置。
- 前記無線通信部は、前記各Ofdmシンボルにおける前記ガードインターバル部分を、前記データ部分よりも長くする、請求項5に記載の無線通信装置。
- 前記無線通信部は、複数のOfdmシンボルの送信用領域を1のガードインターバル部分および1のデータ部分として利用する、請求項4に記載の無線通信装置。
- 前記無線通信部は、前記ガードインターバル部分を前記データ部分より長くする、請求項7に記載の無線通信装置。
- 時間軸および周波数軸上に格子状に配置された複数のリソースブロックから割り当てられたリソースブロックにおいて、隣接リソースブロックとの時間方向または周波数方向の境界に設定された無送信領域では送信を行わず、前記リソースブロックにおける他の領域で送信を行う、無線通信方法。
- 時間軸および周波数軸上に格子状に配置された複数のリソースブロックから割り当てられたリソースブロックにおいて無線信号を送信する無線通信部を備え、
前記無線通信部は、前記リソースブロックにおいてリファレンス信号の送信に利用される周波数では、前記リソースブロックの先頭でリファレンス信号を送信し、リファレンス信号の送信後に他の無線信号を送信する、無線通信装置。 - 前記無線通信部は、前記リソースブロックにおいて送信に利用される全周波数でリファレンス信号を送信する、請求項10に記載の無線通信装置。
- 時間軸および周波数軸上に格子状に配置された複数のリソースブロックからリソースブロックが割り当てられることと;
前記リソースブロックにおいてリファレンス信号の送信に利用される周波数では、前記リソースブロックの先頭でリファレンス信号を送信し、リファレンス信号の送信後に他の無線信号を送信することと;
を含む、無線通信方法。
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BR112012029460A BR112012029460A2 (pt) | 2010-05-26 | 2011-05-17 | "dispositivo e método de comunicação sem fio" |
RU2012149195/07A RU2572096C2 (ru) | 2010-05-26 | 2011-05-17 | Устройство беспроводной связи и способ беспроводной связи |
US13/641,633 US9301255B2 (en) | 2010-05-26 | 2011-05-17 | Wireless communication device and wireless communication method |
CN201180024314.XA CN102907149B (zh) | 2010-05-26 | 2011-05-17 | 无线通信装置和无线通信方法 |
KR1020127029835A KR20130093503A (ko) | 2010-05-26 | 2011-05-17 | 무선 통신 장치 및 무선 통신 방법 |
EP11786519.6A EP2579656A4 (en) | 2010-05-26 | 2011-05-17 | WIRELESS COMMUNICATION DEVICE AND WIRELESS COMMUNICATION PROCESS |
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WO2017047325A1 (ja) * | 2015-09-17 | 2017-03-23 | 株式会社デンソー | 通信装置 |
RU2787853C1 (ru) * | 2019-09-02 | 2023-01-13 | Хуавей Текнолоджиз Ко., Лтд. | Способ и устройство управления воздействием радиочастотного излучения беспроводного устройства и беспроводное устройство |
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CN106797622B (zh) * | 2014-10-08 | 2020-05-12 | 瑞典爱立信有限公司 | 随机接入通道配置 |
EP3251263B1 (en) | 2015-01-30 | 2019-07-17 | Telefonaktiebolaget LM Ericsson (publ) | Configuring wireless communications resources |
US10045334B2 (en) * | 2015-02-13 | 2018-08-07 | Qualcomm Incorporated | Reference signal design for coverage enhancements |
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BR112012029460A2 (pt) | 2017-03-01 |
RU2572096C2 (ru) | 2015-12-27 |
JP5589558B2 (ja) | 2014-09-17 |
JP2011250091A (ja) | 2011-12-08 |
EP2579656A4 (en) | 2015-10-07 |
US9301255B2 (en) | 2016-03-29 |
US20130034079A1 (en) | 2013-02-07 |
EP2579656A1 (en) | 2013-04-10 |
KR20130093503A (ko) | 2013-08-22 |
US20160205629A1 (en) | 2016-07-14 |
RU2012149195A (ru) | 2014-05-27 |
CN105101395A (zh) | 2015-11-25 |
US9629086B2 (en) | 2017-04-18 |
CN102907149A (zh) | 2013-01-30 |
CN102907149B (zh) | 2015-09-23 |
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