WO2015162640A1 - 無線端末、無線局、無線通信システム、および無線通信方法 - Google Patents
無線端末、無線局、無線通信システム、および無線通信方法 Download PDFInfo
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- WO2015162640A1 WO2015162640A1 PCT/JP2014/002266 JP2014002266W WO2015162640A1 WO 2015162640 A1 WO2015162640 A1 WO 2015162640A1 JP 2014002266 W JP2014002266 W JP 2014002266W WO 2015162640 A1 WO2015162640 A1 WO 2015162640A1
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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
- H04W72/0446—Resources in time domain, e.g. slots or frames
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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
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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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
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
Definitions
- the present invention relates to a wireless terminal, a wireless station, a wireless communication system, and a wireless communication method.
- next-generation wireless communication technologies have been discussed in order to further increase the speed and capacity of wireless communication in wireless communication systems such as cellular phone systems (cellular systems).
- 3GPP 3rd Generation Partnership Project
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- LTE includes, in addition to LTE and LTE-A, other wireless communication systems in which these are expanded.
- LTE LTE-A
- D2D Device-to-Device
- 3GPP 3GPP
- wireless terminals located in a short distance usually communicate with each other via a base station, whereas according to D2D, wireless terminals can communicate directly with each other without going through a base station. it can.
- wireless terminals can communicate with each other even when communication via a base station cannot be performed, for example, during a disaster.
- MTC Machine Type Communication
- M2M Machine to Machine
- D2D wireless terminals can communicate with each other without using wireless resources managed and controlled by the base station.
- MCS Modulation Coding Scheme
- D2D communication introduced in LTE uses several basic frameworks such as an uplink frequency band or uplink subframe used for so-called cellular communication between a terminal and a base station.
- ProSePro Proximity Services
- D2D is considered to be a technology with a wide range of applications, it is expected that active discussion will continue as a promising technology in 3GPP.
- FIG. 1 shows a conceptual diagram of communication between terminals.
- FIG. 1 shows a base station 10 and two wireless terminals 20a and 20b (the wireless terminals are collectively referred to as wireless terminal 20).
- the radio terminal 20 cannot perform D2D and uplink transmission at the same time.
- the radio terminal 20 performs D2D and uplink transmission in a time division manner in the uplink frequency band.
- the base station allocates radio resources to the terminals, and transmits and receives radio signals using the radio resources.
- Radio resources are defined in the time axis direction and the frequency direction.
- a radio resource allocation unit in the time axis direction in the LTE system is called a subframe.
- One subframe has a length of 1 millisecond.
- One frame is composed of 10 consecutive subframes.
- the radio terminal 20 performs D2D and uplink transmission in time division in the uplink frequency band. Therefore, when the radio terminal 20 performs D2D, D2D is performed in a certain subframe among the continuous subframes, and uplink transmission is performed in another subframe. This is realized by assigning either D2D or uplink transmission to each subframe for the uplink frequency band in the LTE system. Furthermore, since D2D is generally bidirectional communication, one of D2D in one direction, D2D in the other direction, and uplink transmission can be assigned to each subframe. Conventionally, there are several techniques for such subframe allocation (subframe design).
- the disclosed technology has been made in view of the above, and an object thereof is to provide a wireless terminal, a wireless station, a wireless communication system, and a wireless communication method capable of realizing efficient inter-terminal communication.
- a disclosed wireless terminal includes a wireless communication unit that performs uplink transmission to a wireless station using a predetermined frequency band, and the wireless terminal performs inter-terminal communication with other wireless terminals. Receiving a signal indicating the timing of intermittently performing the uplink transmission from the start to the end, using the frequency band allocated for the inter-terminal communication within the predetermined frequency band, And a control unit that controls the wireless communication unit so as to perform inter-terminal communication and uplink transmission in a time division manner based on the signal.
- the wireless terminal According to one aspect of the wireless terminal, the wireless station, the wireless communication system, and the wireless communication method disclosed in this case, there is an effect that efficient communication between terminals can be realized.
- FIG. 1 is a conceptual diagram of communication between terminals.
- FIG. 2 is a diagram illustrating an example of subframe allocation for performing communication between terminals according to the related art.
- FIG. 3 is a diagram illustrating an example of a sequence of the wireless communication system according to the first embodiment.
- FIG. 4 is a diagram illustrating an example of subframe allocation for performing inter-terminal communication according to the first embodiment.
- 5A and 5B are hardware configuration diagrams of a wireless communication unit included in the wireless terminal.
- FIG. 6 is a diagram illustrating an example of subframe allocation for performing inter-terminal communication according to the second embodiment.
- FIG. 7 is a diagram illustrating an example of a network configuration of the wireless communication system according to each embodiment.
- FIG. 1 is a conceptual diagram of communication between terminals.
- FIG. 2 is a diagram illustrating an example of subframe allocation for performing communication between terminals according to the related art.
- FIG. 3 is a diagram illustrating an example of a sequence of the wireless communication system according to the first
- FIG. 8 is an example of a functional configuration diagram of a base station in the wireless communication system of each embodiment.
- FIG. 9 is an example of a functional configuration diagram of the mobile phone terminal in the wireless communication system of each embodiment.
- FIG. 10 is an example of a hardware configuration diagram of a base station in the wireless communication system of each embodiment.
- FIG. 11 is an example of a hardware configuration diagram of the mobile phone terminal in the wireless communication system of each embodiment.
- a wireless communication system such as a conventional LTE system (which may be called a mobile phone system or a cellular system)
- two wireless terminals 20 communicate via a base station 10 (hereinafter, this is the case).
- This communication form is referred to as “base station communication” for convenience).
- inter-terminal communication such as D2D in the LTE system
- the radio terminals 20 directly perform radio communication without going through the base station 10.
- D2D in the LTE system is not used, but a more general term “terminal-to-terminal communication” is used for explanation, but “terminal-to-terminal communication” may be appropriately replaced with “D2D”.
- the wireless terminal 20 in the cellular system is generally placed under the management of the base station 10 and performs various operations and controls based on instructions from the base station 10 and the like.
- the radio terminal 20 needs to receive radio resource allocation from the base station 10.
- it is natural that inter-terminal communication is performed to a certain extent under the control of the base station 10.
- communication via a base station is normally performed, and it is assumed that the base station 10 permits the wireless terminal 20 to perform communication between terminals when a predetermined condition is satisfied. Is done. This permission may involve assignment of radio resources for terminal-to-terminal communication.
- the terminal-to-terminal communication is started under the management of the base station 10.
- various things can be considered as predetermined conditions for performing communication between terminals.
- the base station 10 may shift some of the subordinate radio terminals 20 from communication via the base station to inter-terminal communication in order to reduce the load on the base station 10. It is done.
- the inter-terminal communication start signal includes various parameters necessary for performing inter-terminal communication.
- a resource block used for communication between terminals can be considered.
- the resource block corresponds to a so-called partial band (subband) in the LTE system.
- the uplink frequency band is allocated to the resource block for communication between terminals.
- the remaining uplink frequency band can be allocated as a radio resource for communication via a base station or as a radio resource for communication between other terminals.
- the two wireless terminals 20 permitted to communicate between terminals from the base station 10 start communication between terminals using the resource block allocated for inter-terminal communication from the base station 10.
- Inter-terminal communication is performed in this resource block in the frequency axis direction, but can be performed in each subframe in the time axis direction.
- the base station 10 designates the information which shows start timing with the communication start signal between terminals. It doesn't matter.
- the base station 10 ends the inter-terminal communication with respect to the two radio terminals 20 when the predetermined condition for the end of the inter-terminal communication is satisfied (for example, when the load of the base station 10 becomes a predetermined value or less).
- a signal to that effect (hereinafter referred to as an inter-terminal communication end signal for convenience) is transmitted.
- the wireless terminal 20 ends the terminal-to-terminal communication based on the signal.
- finishes the communication between terminals it is good also as the next sub-frame which received the communication completion signal between terminals, and the base station 10 designates the information which shows completion
- the base station 10 determines the start and end of inter-terminal communication based on the load of the base station 10, but these determinations are more preferably based on the radio quality between the radio terminals 20. It is conceivable that. This is because it is difficult to effectively perform inter-terminal communication when the radio quality between the radio terminals 20 performing inter-terminal communication is poor.
- the base station 10 in order for the base station 10 to grasp the radio quality between the radio terminals 20, the base station 10 needs to receive a report on the measurement result of the radio quality from the radio terminal 20. The reason why the wireless quality between the two wireless terminals 20 can be measured is only those wireless terminals 20 and the base station 10 cannot measure them.
- a subframe for performing uplink transmission without performing inter-terminal communication has a certain frequency. It will be necessary.
- FIG. 2 shows an example of subframe allocation for performing inter-terminal communication according to the above-described prior art.
- FIG. 2 shows an example of subframe allocation for performing inter-terminal communication according to the above-described prior art.
- FIG. 2 for the sake of space, only 10 subframes of the 0th subframe to the 9th subframe are shown in the time axis direction, but subframes having the same pattern may be repeated before and after this. Please note that.
- the allocation of uses such as inter-terminal communication and uplink transmission to each subframe is uniformly performed over the entire uplink frequency band. It has been broken.
- the uplink frequency band includes six resource blocks. All of these are assigned usages uniformly. This is because the allocation of applications to subframes in the prior art is not limited to two wireless terminals 20 that perform inter-terminal communication under the control of a certain base station 10, but also all wireless devices that are under the control of a certain base station 10. This means that the present invention is applied to the terminal 20 (including the wireless terminal 20 performing communication via the base station 10).
- the assignment of usage to each subframe is fixed.
- the former is more or similar, and the allocation for uplink transmission is relatively large.
- the 0th subframe and the 5th subframe are fixedly allocated for inter-terminal communication.
- the first to fourth subframes and the sixth to ninth subframes are fixedly assigned for uplink transmission. This is because the allocation of the prior art is applied to all the radio terminals 20 under the control of a certain base station 10, and among the radio terminals 20, communication between terminals is a minority, and many radio terminals It is assumed that 20 is for performing uplink transmission related to communication via the base station.
- the frequency of reporting the radio quality may be low, and it is considered that one subframe is sufficient for several tens to several hundreds of subframes for uplink transmission.
- the number of subframes for uplink transmission is rather larger, and it is estimated that there is a high possibility that the ratio required for reporting wireless quality and the like will be significantly exceeded. If there are a lot of subframes for uplink transmission, the number of subframes for terminal-to-terminal communication decreases accordingly. As a result, radio resources that can be used for inter-terminal communication are reduced, and thus the throughput (transmission efficiency) of inter-terminal communication may be reduced.
- the frequency of uplink transmission required for terminal-to-terminal communication is not constant in the first place.
- the frequency of reporting is also different.
- the subframe for uplink transmission is fixedly assigned to all the radio terminals 20, and therefore, the reporting frequency of radio quality is the same in the above two cases. I have to be. As a result, a situation may occur in which there are too many uplink transmission subframes or too few.
- the end timing of the inter-terminal communication is determined by the base station 10 because this determination is made based on a radio quality report or the like transmitted from the radio terminal 20.
- the LTE system stipulates that communication between terminals uses an uplink frequency band, and therefore, it is necessary to perform communication between terminals and uplink transmission in a time division manner.
- the radio terminal 20 since the radio terminal 20 is required to perform uplink transmission while performing inter-terminal communication, it is necessary to interrupt the inter-terminal communication at a certain frequency and perform uplink transmission between them.
- the situation in which resource blocks (subbands) are individually allocated to the inter-terminal communication as in the present application is not sufficiently considered, so the setting of the uplink transmission performed between the inter-terminal communications is flexible. Inconvenience was found that the frequency of uplink transmission is too high.
- the conventional technology has a problem that the throughput of the inter-terminal communication is reduced and the timely termination is difficult, and as a result, the inter-terminal communication cannot be effectively performed. It should be noted that although the above description has been given in the context of the LTE system, this problem is not limited to the LTE system, and a similar wireless communication system can be provided. Hereinafter, each embodiment of the present application for solving this problem will be described in order.
- the first embodiment is a wireless terminal 20, which is a wireless communication unit that performs uplink transmission to a wireless station using a predetermined frequency band, and ends after the wireless terminal 20 starts inter-terminal communication with another wireless terminal 20.
- a base station 10 (also referred to as “radio base station”) is considered as the above-described radio station, but other radio communication apparatuses including the third radio terminal 20 and the like are provided. It doesn't matter.
- the wireless terminal 20 acts as a proxy for the function of the base station 10 when the base station 10 stops functioning due to a disaster or the like can be considered.
- the radio station is the base station 10 will be described, but it should be noted that the present invention is not limited to this.
- the present invention is not limited to the LTE system, and a similar wireless communication system having the problems described above can also be applied.
- FIG. 3 is a diagram showing an example of a processing sequence according to the first embodiment.
- the two wireless terminals 20, that is, the first wireless terminal 20 a and the second wireless terminal 20 b are under the control (subordinate) of the base station 10.
- Each of the first radio terminal 20a and the second radio terminal 20b does not need to be in communication, but is assumed to be in a state of being synchronized with at least the base station 10.
- the meaning of synchronization here is that the wireless terminal 20 is in a state where it can receive at least a synchronization signal and a common control signal transmitted from the base station 10 and confirm the contents thereof.
- the first wireless terminal 20a and the second wireless terminal 20b may be simply referred to as the wireless terminal 20.
- the first radio terminal 20a and the second radio terminal 20b transmit uplink signals to the base station 10 for the base station 10 to determine whether or not inter-terminal communication is possible.
- this information is referred to as a determination signal for convenience.
- the determination signal may be transmitted via the uplink control channel PUCCH (Physical Uplink Control CHannel), or may be transmitted via the uplink data channel PUSCH (Physical Uplink Shared CHannel).
- PUCCH Physical Uplink Control CHannel
- PUSCH Physical Uplink Shared CHannel
- an RRC (Radio Resource Control) signal that is an upper control signal may be transmitted via the PUSCH.
- the determination signal transmitted by the first wireless terminal 20a will be described as an example. Since the determination signal transmitted by the second radio terminal 20b is the same as this, the description thereof is omitted.
- the determination signal transmitted by the first radio terminal 20a can include arbitrary information, but includes, for example, the quality of the radio environment (radio quality) in the direction from the second radio terminal 20b to the first radio terminal 20a. Can do. This corresponds to the reception quality of the radio signal from the second radio terminal 20b in the first radio terminal 20a.
- the determination signal may include a path loss (propagation loss) between the first radio terminal 20a and the second radio terminal 20b.
- the first radio terminal 20a can measure or measure the radio quality and path loss based on a reference signal (also referred to as a reference signal or a pilot signal) transmitted from the second radio terminal 20b.
- the transmission timing of the determination signal may be instructed by the base station 10 in advance, or may be transmitted when the wireless terminal 20 detects some event. Further, the transmission timing of the determination signal may be a common timing (common subframe) between the first radio terminal 20a and the second radio terminal 20b, or may be a different timing (different subframe).
- the base station 10 performs inter-terminal communication between the first radio terminal 20a and the second radio terminal 20b based on the determination signal received from the first radio terminal 20a and the second radio terminal 20b in S101. To determine (or determine) whether or not to start. This determination can be made based on any criterion. For example, when the wireless quality between the first wireless terminal 20a and the second wireless terminal 20b indicated by the determination signal satisfies a predetermined criterion in both directions, it is determined to start inter-terminal communication. On the other hand, when the radio quality between the first radio terminal 20a and the second radio terminal 20b does not satisfy a predetermined standard in any direction, it is determined that the inter-terminal communication is not started.
- the determination in S102 may be performed based on information (for example, path loss) other than the wireless quality included in the determination signal in S101. Furthermore, it goes without saying that the determination in S102 may be performed based on various information (such as the load of the base station 10) that is not included in the determination signal in S101.
- information for example, path loss
- the determination in S102 may be performed based on various information (such as the load of the base station 10) that is not included in the determination signal in S101.
- the base station 10 determines that communication between the first radio terminal 20a and the second radio terminal 20b is started. In this case, the base station 10 further determines various parameters for the first wireless terminal 20a and the second wireless terminal 20b to perform inter-terminal communication. For example, the base station 10 determines a resource block (subband) allocated for inter-terminal communication between the first radio terminal 20a and the second radio terminal 20b.
- a resource block subband
- the base station 10 starts the first radio terminal after the start (and before the end) of the inter-terminal communication.
- the timing for 20a and the second radio terminal 20b to perform uplink transmission is determined.
- this timing is referred to as upstream transmission timing.
- the uplink transmission timing may be common to the first radio terminal 20a and the second radio terminal 20b, or may be different.
- the uplink transmission timing is specified by an identifier (number) of a subframe.
- the subframe is a unit of radio resource allocation in the time axis direction in the LTE system.
- One subframe has a length of 1 millisecond, and one subframe is composed of two consecutive slots.
- One slot is composed of 7 consecutive symbols, and thus one subframe is composed of 14 consecutive symbols.
- One frame is composed of 10 consecutive subframes.
- the determination of uplink transmission timing can be performed by an arbitrary method.
- the uplink transmission timing can be determined based on the magnitude of change per unit time in the radio quality between the first radio terminal 20a and the second radio terminal 20b. More specifically, the uplink transmission timing is set to a relatively high frequency when the change in radio quality is large, and is set to a relatively low frequency when the change is small. In this way, when the radio quality is unstable due to the radio terminal 20 moving at high speed, the base station 10 can obtain the radio quality from the radio terminal 20 at a relatively high frequency. This makes it easier to follow changes in wireless quality. On the other hand, when the radio quality is stable because the radio terminal 20 is stationary, the base station 10 can obtain the radio quality from the radio terminal 20 at a relatively low frequency, and the amount of uplink signal Can be suppressed.
- the base station 10 transmits a signal indicating that communication between terminals is started to the first radio terminal 20a and the second radio terminal 20b based on the determination in S102.
- this signal is referred to as an inter-terminal communication start signal.
- the start of communication between terminals may be referred to as activation of communication between terminals (Activation).
- the terminal-to-terminal communication start signal may be transmitted via a downlink control channel PDCCH (Physical Downlink Control CHannel), or may be transmitted via a downlink data channel PDSCH (Physical Downlink Shared CHannel). I do not care.
- PDCCH Physical Downlink Control CHannel
- PDSCH Physical Downlink Shared CHannel
- an RRC (Radio Resource Control) signal that is an upper control signal may be transmitted via the PDSCH.
- the inter-terminal communication start signal includes various parameters for the inter-terminal communication between the first radio terminal 20a and the second radio terminal 20b determined by the base station 10 in S102.
- the inter-terminal communication start signal can include a resource block (subband) assigned for inter-terminal communication between the first radio terminal 20a and the second radio terminal 20b.
- a resource block subband assigned for inter-terminal communication between the first radio terminal 20a and the second radio terminal 20b.
- the inter-terminal communication start signal according to the first embodiment can include information indicating the uplink transmission timing described above.
- the designation of uplink transmission timing corresponds to the designation of a subframe for uplink transmission.
- an offset value indicating the first subframe for uplink transmission and a subframe for uplink transmission are used. It can be specified by the frame period. Further, this offset value may be fixed in the system and only the period may be designated.
- the uplink subframes are intermittent, and that the length of each uplink transmission is 1 subframe. More simply, it is assumed that the uplink subframe is a single periodic subframe.
- each radio terminal 20 needs to perform uplink transmission between the start and end of inter-terminal communication, but the base station 10 grasps the status of inter-terminal communication that is transmitted by the uplink transmission. It is only information for. It is sufficient that such information is transmitted intermittently (periodically), and the size of the information is relatively small. Therefore, it is considered appropriate to make the above assumption. By setting such a premise, it is possible to suppress the amount of information of uplink transmission timing as compared with the method of specifying a subframe for uplink transmission.
- the transmission period is quantized and selected, for example, from 2, 5, 10, 20, 32, 40, 64, 80, 128, 160 (unit: subframe)
- the amount of information of uplink transmission timing Is further suppressed.
- the present invention does not require the above premise, and the uplink transmission timing in the inter-terminal communication start signal may be specified by an arbitrary method.
- the first wireless terminal 20a and the second wireless terminal 20b start inter-terminal communication based on the inter-terminal communication start signal received in S103.
- This inter-terminal communication can be performed using the resource block (subband) specified by the inter-terminal communication start signal.
- the start timing of the inter-terminal communication is specified in the inter-terminal communication start signal
- the first radio terminal 20a and the second radio terminal 20b start the inter-terminal communication according to the start timing.
- the subframe in which the communication between terminals is performed includes a subframe transmitted from the first radio terminal 20a to the second radio terminal 20b and a subframe transmitted from the second radio terminal 20b to the first radio terminal 20a. This allocation may be arbitrarily determined.
- inter-terminal communication may be performed by either a synchronous communication method or an asynchronous communication method.
- the inter-terminal communication can be started after performing processing for establishing synchronization between the wireless terminals 20.
- information necessary for synchronization (establishing a wireless link) between the wireless terminals 20 may be notified by a communication start signal between terminals.
- the first radio terminal 20a and the second radio terminal 20b perform the first uplink transmission after the start of inter-terminal communication based on the uplink transmission timing specified by the inter-terminal communication start signal received in S103. .
- the timing of S105 is specified by the offset value. It becomes a subframe.
- the signal transmitted in S105 may be transmitted via the PUCCH or may be transmitted via the PUSCH.
- an RRC signal that is a higher-level control signal can be transmitted via PUSCH.
- the signal transmitted in S105 may include arbitrary information, but can typically be a determination signal similar to S101.
- the base station 10 needs to determine the end timing of the inter-terminal communication in a timely manner. Therefore, it is desirable that the base station 10 periodically receives a determination signal from the radio terminal 20 as a determination material for the determination.
- both the first radio terminal 20a and the second radio terminal 20b perform uplink transmission as an example, but only one of the radio terminals 20 may perform, or any of the radio terminals You don't have to do 20.
- the first radio terminal 20a and the second radio terminal 20b can alternately perform uplink transmission.
- the base station 10 performs inter-terminal communication between the first radio terminal 20a and the second radio terminal 20b based on the determination signal received from the first radio terminal 20a and the second radio terminal 20b in S105. It is determined (or determined) whether or not to end. This determination can be performed based on an arbitrary criterion. For example, when the wireless quality between the first wireless terminal 20a and the second wireless terminal 20b does not satisfy a predetermined criterion in any direction, the communication between terminals is performed. It is determined to end. On the other hand, when the wireless quality between the first wireless terminal 20a and the second wireless terminal 20b satisfies a predetermined standard in both directions, it is determined that the inter-terminal communication is not ended (continues).
- the determination in S106 may be performed based on information (for example, path loss) other than the wireless quality included in the determination signal in S105 or information (for example, the load on the base station 10) that is not included therein.
- the base station 10 determines that the inter-terminal communication between the first radio terminal 20a and the second radio terminal 20b is not terminated. In this case, the base station 10 does not particularly need to notify the first radio terminal 20a and the second radio terminal 20b.
- the first wireless terminal 20a and the second wireless terminal 20b perform inter-terminal communication. Since S107 may be performed in the same manner as S104, description thereof is omitted.
- the first wireless terminal 20a and the second wireless terminal 20b perform the second uplink transmission after the start of inter-terminal communication.
- the uplink transmission timing information is composed of the offset value indicating the first subframe for uplink transmission and the cycle of the subframe for uplink transmission
- the timing of S108 is determined from the subframe of S105. It becomes a subframe after the period. Since S108 may be performed in the same manner as S105, description thereof is omitted.
- the base station 10 performs inter-terminal communication between the first radio terminal 20a and the second radio terminal 20b based on the determination signal received from the first radio terminal 20a and the second radio terminal 20b in S108.
- a determination is made as to whether or not to end. Since S109 may be performed in the same manner as S106, description thereof is omitted. Also in S109 of FIG. 3, as an example, it is assumed that the base station 10 determines that the inter-terminal communication between the first radio terminal 20a and the second radio terminal 20b is not terminated.
- the first radio terminal 20a and the second radio terminal 20b repeatedly perform inter-terminal communication and uplink transmission, and each time the base station 10 performs inter-terminal communication based on the uplink transmission. It is determined whether or not to end.
- FIG. 4 shows an example of a subframe configuration related to resource blocks allocated for inter-terminal communication in the first embodiment.
- FIG. 4 only 10 subframes of the 0th subframe to the 9th subframe are shown in the time axis direction for the sake of space, but subframes having the same pattern may be repeated before and after this. Please note that.
- one of the six resource blocks constituting the uplink frequency band (fourth from the top in FIG. 4) is assigned as a resource block for inter-terminal communication. And only for this resource block for inter-terminal communication, uses such as inter-terminal communication and uplink transmission are assigned.
- the five resource blocks other than the resource block for terminal-to-terminal communication are not constrained to the uses assigned only to the resource block for terminal-to-terminal communication. Therefore, the base station 10 can allocate five resource blocks other than the resource block for inter-terminal communication as radio resources for communication via the base station, or can be allocated as radio resources for communication between other terminals.
- FIG. 4 shows a case where the cycle of the uplink transmission timing is 5 subframes.
- the 0th to 3rd subframes and the 5th to 8th subframes are allocated for inter-terminal communication.
- the fourth subframe and the ninth subframe are allocated for uplink transmission. It should be noted that these assignments are not fixed and are assigned variably (dynamically) according to an inter-terminal communication start signal.
- the first radio terminal 20a and the second radio terminal 20b transmit determination signals to the base station 10 in S110.
- the base station 10 determines in S111 that the inter-terminal communication between the first wireless terminal 20a and the second wireless terminal 20b is terminated based on the determination signal in S110.
- the base station 10 transmits a signal indicating that the inter-terminal communication is terminated to the first wireless terminal 20a and the second wireless terminal 20b based on the determination of S111.
- this signal is referred to as an inter-terminal communication end signal.
- the start of communication between terminals may be referred to as deactivation (deactivation) of communication between terminals.
- the inter-terminal communication end signal may be transmitted via the PDCCH or may be transmitted via the PDSCH.
- an RRC signal that is a higher-level control signal can be transmitted via PDSCH.
- the inter-terminal communication end signal may include a parameter related to the end of inter-terminal communication. An example of such a parameter is the end timing of communication between terminals.
- the inter-terminal communication is terminated.
- the end timing of the inter-terminal communication is included in the inter-terminal communication end signal
- the first radio terminal 20a and the second radio terminal 20b end the inter-terminal communication based on the end timing.
- the communication is performed via the base station 10 based on a normal cellular communication method.
- the second embodiment corresponds to a subordinate concept of the first embodiment, and specifically realizes more effective inter-terminal communication based on the configuration of the wireless terminal 20.
- the second embodiment is a subordinate concept of the first embodiment, in the following, the second embodiment will be described in detail focusing on differences from the first embodiment. It should be noted that in the second embodiment, descriptions overlapping with those in the first embodiment are omitted as appropriate.
- FIG. 5A shows a hardware configuration of a wireless communication unit 25 that processes a wireless signal in a general wireless terminal 20 that does not perform communication between terminals.
- the wireless communication unit 25 in FIG. 5A includes an antenna 121, a frequency separation filter 1221, a transmission circuit 1222, and a reception circuit 1223. Note that the wireless communication unit 25 in FIG. 5A corresponds to the wireless communication unit 25 in FIG. 9 described later. 5A corresponds to the antenna 121 in FIG. 11, and the frequency separation filter 1221, the transmission circuit 1222, and the reception circuit 1223 in FIG. 5A correspond to the RF circuit 122 in FIG. 11.
- the antenna 121 is used for both transmission and reception.
- the uplink signal and the downlink signal are mixed.
- different frequency bands are used for the upstream signal and the downstream signal, and therefore these are electrically connected by the frequency separation filter 1221 (duplexer) connected to the antenna 121. It is possible to separate. Accordingly, the transmission circuit 1222 can process the upstream signal, and the reception circuit 1223 can process the downstream signal.
- FIG. 5B shows a hardware configuration of the radio communication unit 25 that processes radio signals in the radio terminal 20 that performs inter-terminal communication.
- the wireless communication unit 25 in FIG. 5B includes a switch 1224 in addition to the antenna 121, the frequency separation filter 1221, the transmission circuit 1222, and the reception circuit 1223.
- the wireless communication unit 25 in FIG. 5B also corresponds to the wireless communication unit 25 in FIG. 9 described later.
- 5B corresponds to the antenna 121 in FIG. 11, and the frequency separation filter 1221, the transmission circuit 1222, the reception circuit 1223, and the switch 1224 in FIG. 5A correspond to the RF circuit 122 in FIG. 11.
- the uplink frequency band signal separated by the frequency separation filter 1221 is further mechanically switched by switching the switch 1224.
- the transmission circuit 1222 and the reception circuit 1223 are separated.
- the switching by the switch 1224 is not an electrical process like the frequency separation filter 1221, a switching time (gap) is required.
- This switching time is very small and can be as short as one symbol (14 symbols correspond to one subframe).
- the radio terminal 20 cannot transmit or receive using the uplink frequency band. Become. For this reason, the efficiency of inter-terminal communication may be affected by how this switching time is arranged in a subframe.
- the second embodiment has been created based on such a viewpoint.
- the processing sequence according to the second embodiment is the same as the processing sequence according to the first embodiment illustrated in FIG.
- FIG. 6 shows an example of a subframe configuration related to a resource block allocated for inter-terminal communication in the second embodiment.
- FIG. 6 only 10 subframes of the 0th subframe to the 9th subframe are shown in the time axis direction for the sake of space, but subframes having the same pattern may be repeated before and after this. Please note that.
- FIG. 6 corresponds to FIG. 4 in the first embodiment, and shows, as an example, a case where the cycle of the uplink transmission timing is 5 subframes.
- the 0th to 3rd subframes and the 5th to 8th subframes are allocated for inter-terminal communication.
- the fourth subframe and the ninth subframe are allocated for uplink transmission. It should be noted that these assignments are not fixed and are assigned variably (dynamically) according to an inter-terminal communication start signal.
- the first and last symbols among the 14 symbols constituting each subframe for uplink transmission are used as the switching time described above.
- the subframe for inter-terminal communication is divided into two according to the communication direction. Specifically, as an example, the 0th to 3rd subframes are subframes for terminal-to-terminal communication from the first radio terminal 20a to the second radio terminal 20b.
- the fifth to eighth subframes are subframes for terminal-to-terminal communication from the second radio terminal 20b to the first radio terminal 20a. In this way, the subframe for inter-terminal communication from the first radio terminal 20a to the second radio terminal 20b and the terminal from the second radio terminal 20b to the first radio terminal 20a across the subframe for uplink transmission.
- the subframes for communication appear alternately.
- the first radio terminal 20a After the subframe is configured as shown in FIG. 6, the first radio terminal 20a performs transmission / reception switching for each of the last symbol of the fourth subframe and the first symbol of the ninth subframe. On the other hand, in the first radio terminal 20a, transmission / reception is not switched in each of the first symbol of the fourth subframe and the last symbol of the ninth subframe. Similarly, in the second radio terminal 20b, transmission / reception is switched in each of the first symbol of the fourth subframe and the last symbol of the ninth subframe. On the other hand, in the second radio terminal 20b, transmission / reception is not switched in each of the last symbol of the fourth subframe and the first symbol of the ninth subframe.
- the first radio terminal 20a transmits in the 0th to 4th subframe and the 9th subframe, and receives in the 5th to 8th subframe, so that 10 subframes are received.
- the transmission / reception switching (switching by the switch 1224) may be performed twice.
- the second radio terminal 20b performs transmission in the fourth to ninth subframes and receives in the 0th to third subframes, so that transmission / reception switching (twice transmission / reception switching in ten subframes) ( (Switching by the switch 1224) may be performed.
- both the first radio terminal 20a and the second radio terminal 20b can efficiently switch between the terminal communication and the uplink communication by the same number of switching times as the uplink transmission subframe.
- the interterminal communication can be performed efficiently.
- the uplink transmission during the communication between terminals is limited to the report of the radio quality as described above, and the information size is relatively small. Therefore, even if a switching time is provided in the uplink transmission subframe as shown in FIG.
- a sounding reference signal that is a reference signal for uplink scheduling is generally arranged as the last symbol of each uplink subframe.
- the radio terminal 20 that performs inter-terminal communication does not need uplink scheduling, and therefore does not need to transmit a sounding reference signal. Therefore, setting the last symbol of the subframe for uplink transmission as the transmission / reception switching time effectively uses the symbol that does not need to be transmitted, which contributes to efficient inter-terminal communication more and more. Conceivable.
- the wireless communication system 1 includes a base station 10 and a wireless terminal 20.
- wireless terminals 20 are illustrated, it cannot be overemphasized that this is only an example.
- the base station 10 forms a cell C10.
- the radio terminal 20 exists in the cell C10. Note that in this application, the base station 10 may be referred to as a “transmitting station” and the wireless terminal 20 may be referred to as a “receiving station”.
- the base station 10 is connected to the network device 3 via a wired connection, and the network device 3 is connected to the network 2 via a wired connection.
- the base station 10 is provided so as to be able to transmit / receive data and control information to / from other base stations 10 via the network device 3 and the network 2.
- the base station 10 may separate the wireless communication function with the wireless terminal 20 and the digital signal processing and control function to be a separate device.
- a device having a wireless communication function is referred to as RRH (Remote Radio Head)
- BBU Base Band Unit
- the RRH may be installed overhanging from the BBU, and may be wired with an optical fiber between them.
- the base station 10 may be a base station 10 of various scales in addition to a small base station 10 (including a micro base station 10, a femto base station 10 and the like) such as a macro base station 10 and a pico base station 10. .
- the relay station transmission / reception with the radio terminal 20 and its control
- the base station 10 of the present application Good.
- the wireless terminal 20 communicates with the base station 10 by wireless communication, as shown in FIG. In FIG. 7, as an example, the radio terminal 20a and the radio terminal 20b perform inter-terminal communication. Thus, the wireless terminal 20 performs inter-terminal communication with the other wireless terminals 20.
- the wireless terminal 20 may be a wireless terminal 20 such as a mobile phone, a smartphone, a PDA (Personal Digital Assistant), a personal computer (Personal Computer), various devices or devices (such as sensor devices) having a wireless communication function.
- a relay station that relays wireless communication between the base station 10 and the wireless terminal 20 is used, the relay station (transmission / reception with the base station 10 and its control) is also included in the wireless terminal 20 of this paper. Good.
- the network device 3 includes, for example, a communication unit and a control unit, and these components are connected so that signals and data can be input and output in one direction or in both directions.
- the network device 3 is realized by a gateway, for example.
- the communication unit is realized by an interface circuit
- the control unit is realized by a processor and a memory.
- each component of the base station 10 and the wireless terminal 20 is not limited to the aspect of the first embodiment, and all or a part thereof depends on various loads, usage conditions, and the like. Thus, it can be configured to be functionally or physically distributed and integrated in arbitrary units.
- the memory may be connected as an external device of the base station 10 and the wireless terminal 20 via a network or a cable.
- the wireless terminal 20 includes the first wireless terminal 20a and the second wireless terminal 20b in the above-described embodiments.
- FIG. 8 is a functional block diagram showing an example of the configuration of the base station 10.
- the base station 10 includes, for example, a wireless transmission unit 11, a wireless reception unit 12, a control unit 13, a storage unit 14, and a communication unit 15. Each of these components is connected so that signals and data can be input and output in one direction or in both directions.
- the wireless transmission unit 11 and the wireless reception unit 12 are collectively referred to as a wireless communication unit 16.
- the wireless transmission unit 11 transmits a data signal and a control signal by wireless communication via an antenna.
- the antenna may be common for transmission and reception.
- the radio transmission unit 11 transmits a radio signal (downlink radio signal) to the radio terminal 20.
- the radio signal transmitted by the radio transmission unit 11 can include arbitrary user data for the radio terminal 20, control information (encoded or modulated), a reference signal, and the like.
- radio signal transmitted by the radio transmission unit 11 include radio signals (arrows in the figure) transmitted from the base station 10 to the radio terminal 20 in FIG.
- the radio signal transmitted by the radio transmission unit 11 is not limited to these, and includes any radio signal transmitted from the base station 10 to the radio terminal 20 in each of the above embodiments and modifications.
- the wireless receiving unit 12 receives a data signal and a control signal by wireless communication via an antenna.
- the radio reception unit 12 receives a radio signal (uplink radio signal) from the radio terminal 20.
- the radio signal received by the radio receiving unit 12 can include arbitrary user data transmitted from the radio terminal 20, control information (encoded or modulated), a reference signal, and the like.
- the radio signal received by the radio receiving unit 12 there is a radio signal (arrow in the figure) received by the base station 10 from the radio terminal 20 in FIG.
- the signal received by the wireless reception unit 12 is not limited to these, and includes any wireless signal that the base station 10 receives from the wireless terminal 20 in each of the above embodiments and modifications.
- the control unit 13 outputs data and control information to be transmitted to the wireless terminal 20 to the wireless transmission unit 11.
- the control unit 13 inputs data and control information received from the wireless terminal 20 from the wireless reception unit 12.
- the control unit 13 inputs and outputs data, control information, programs, and the like with the storage unit 14 described later.
- the control unit 13 inputs / outputs data and control information transmitted / received to / from the other base station 10 and the like with the communication unit 15 described later. In addition to these, the control unit 13 performs various controls in the base station 10.
- control unit 13 Specific examples of processing controlled by the control unit 13 include control on signals (arrows in the figure) transmitted and received by the base station 10 in FIG. 3 and processings performed by the base station 10 (rectangles in the figure). ) Control.
- the process which the control part 13 controls is not restricted to these, but includes the control regarding all the processes which the base station 10 performs by said each embodiment and modification.
- the storage unit 14 stores various information such as data, control information, and programs.
- the various information stored in the storage unit 14 includes all information that can be stored in the base station 10 in each of the above-described embodiments and modifications.
- the communication unit 15 transmits / receives data and control information to / from another base station 10 or the like via a wired signal or the like (which may be a wireless signal).
- a wired signal or the like which may be a wireless signal.
- Specific examples of the wired signal transmitted and received by the communication unit 15 include each wired signal transmitted and received by the base station 10 with respect to the other base station 10 in each embodiment.
- the wired signal transmitted / received by the communication unit 15 is not limited to these, and includes any wired signal transmitted / received by the base station 10 to / from another base station 10 or the like in the above-described embodiments and modifications.
- the base station 10 may transmit and receive wireless signals to / from wireless communication devices other than the wireless terminal 20 (for example, other base stations 10 and relay stations) via the wireless transmission unit 11 and the wireless reception unit 12.
- wireless communication devices other than the wireless terminal 20 (for example, other base stations 10 and relay stations) via the wireless transmission unit 11 and the wireless reception unit 12.
- FIG. 9 is a functional block diagram showing an example of the configuration of the wireless terminal 20.
- the wireless terminal 20 includes, for example, a wireless transmission unit 21, a wireless reception unit 22, a control unit 23, and a storage unit 24. Each of these components is connected so that signals and data can be input and output in one direction or in both directions.
- the wireless transmission unit 21 and the wireless reception unit 22 are collectively referred to as a wireless communication unit 25.
- the wireless transmission unit 21 transmits a data signal and a control signal by wireless communication via an antenna.
- the antenna may be common for transmission and reception.
- the radio transmission unit 21 transmits a radio signal (uplink radio signal) to the base station 10.
- the radio signal transmitted by the radio transmission unit 21 can include arbitrary user data for the base station 10, control information (encoded or modulated), a reference signal, and the like.
- the wireless transmission unit 21 can transmit a wireless signal to another wireless terminal 20 (communication between terminals).
- the radio signal transmitted by the radio transmission unit 21 can include arbitrary user data for other radio terminals 20, control information (encoded or modulated), a reference signal, and the like.
- Each radio signal transmitted to the terminal 20 is exemplified.
- the wireless signal transmitted by the wireless transmission unit 21 is not limited to these, and any wireless signal transmitted from the wireless terminal 20 to the base station 10 in each of the above-described embodiments and modifications, and the wireless terminal 20 transmits another wireless terminal 20. Includes any radio signal that is being transmitted to.
- the wireless receiving unit 22 receives data signals and control signals by wireless communication via an antenna.
- the radio reception unit 22 receives a radio signal (downlink radio signal) from the base station 10.
- the radio signal received by the radio reception unit 22 can include arbitrary user data transmitted from the base station 10, control information (encoded or modulated), a reference signal, and the like.
- the wireless reception unit 22 can receive a wireless signal from another wireless terminal 20 (communication between terminals).
- the radio signal transmitted by the radio reception unit 22 can include arbitrary user data from other radio terminals 20, control information (encoded and modulated), a reference signal, and the like.
- each radio signal (arrow in the figure) received by the radio terminal 20 from the base station 10 in FIG. 3 and the radio terminal 20 is another radio terminal 20.
- Each wireless signal received from is listed.
- the signals received by the wireless reception unit 22 are not limited to these, and any wireless signal received by the wireless terminal 20 from the base station 10 and the wireless terminal 20 received from the other wireless terminals 20 in the above-described embodiments and modifications. Including any radio signal you are doing.
- the control unit 23 outputs data and control information to be transmitted to the base station 10 to the wireless transmission unit 21.
- the control unit 23 inputs data and control information received from the base station 10 from the wireless reception unit 22.
- the control unit 23 inputs and outputs data, control information, programs, and the like with the storage unit 24 described later. In addition to these, the control unit 23 performs various controls in the wireless terminal 20.
- control for each signal (arrow in the figure) transmitted and received by the wireless terminal 20 in FIG. 3 and each process (rectangle in the figure) performed by the wireless terminal 20 are illustrated.
- Control The process which the control part 23 controls is not restricted to these, but includes the control regarding all the processes which the radio
- the storage unit 24 stores various information such as data, control information, and programs.
- the various information stored in the storage unit 24 includes all information that can be stored in the wireless terminal 20 in each of the above-described embodiments and modifications.
- the wireless terminal 20 may transmit and receive wireless signals to / from wireless communication devices other than the base station 10 via the wireless transmission unit 21 and the wireless reception unit 22.
- the wireless terminal 20 includes the first wireless terminal 20a and the second wireless terminal 20b in the above-described embodiments.
- FIG. 10 is a diagram illustrating an example of a hardware configuration of the base station 10.
- the base station 10 includes, as hardware components, for example, an RF (Radio Frequency) circuit 112 including an antenna 111, a processor 113, a memory 114, and a network IF (Interface) 115. . These components are connected so that various signals and data can be input and output via a bus.
- RF Radio Frequency
- the processor 113 is, for example, a CPU (Central Processing Unit) or a DSP (Digital Signal Processor). In the present application, the processor 113 may be realized by a digital electronic circuit. Examples of digital electronic circuits include ASIC (Application Specific Integrated Circuit), FPGA (Field-Programming Gate Array), LSI (Large Scale Integration), and the like.
- ASIC Application Specific Integrated Circuit
- FPGA Field-Programming Gate Array
- LSI Large Scale Integration
- the memory 114 includes at least one of RAM (Random Access Memory) such as SDRAM (Synchronous Dynamic Random Access Memory), ROM (Read Only Memory), and flash memory, and stores programs, control information, and data.
- RAM Random Access Memory
- SDRAM Serial Dynamic Random Access Memory
- ROM Read Only Memory
- flash memory stores programs, control information, and data.
- the base station may include an auxiliary storage device (such as a hard disk) not shown.
- the wireless transmission unit 11 and the wireless reception unit 12 are realized by the RF circuit 112, or the antenna 111 and the RF circuit 112, for example.
- the control unit 13 is realized by, for example, the processor 113, the memory 114, a digital electronic circuit (not shown), and the like.
- the storage unit 14 is realized by the memory 114, for example.
- the communication unit 15 is realized by the network IF 115, for example.
- FIG. 11 is a diagram illustrating an example of a hardware configuration of the wireless terminal 20.
- the wireless terminal 20 includes, as hardware components, an RF (Radio Frequency) circuit 122 including an antenna 121, a processor 123, and a memory 124, for example. These components are connected so that various signals and data can be input and output via a bus.
- RF Radio Frequency
- the processor 123 is, for example, a CPU (Central Processing Unit) or a DSP (Digital Signal Processor). In the present application, the processor 123 may be realized by a digital electronic circuit. Examples of digital electronic circuits include ASIC (Application Specific Integrated Circuit), FPGA (Field-Programming Gate Array), LSI (Large Scale Integration), and the like.
- ASIC Application Specific Integrated Circuit
- FPGA Field-Programming Gate Array
- LSI Large Scale Integration
- the memory 124 includes at least one of RAM (Random Access Memory) such as SDRAM (Synchronous Dynamic Random Access Memory), ROM (Read Only Memory), and flash memory, and stores programs, control information, and data.
- RAM Random Access Memory
- SDRAM Serial Dynamic Random Access Memory
- ROM Read Only Memory
- flash memory stores programs, control information, and data.
- the wireless transmission unit 21 and the wireless reception unit 22 are realized by the RF circuit 122, the antenna 121, and the RF circuit 122, for example.
- the control unit 23 is realized by, for example, the processor 123, the memory 124, a digital electronic circuit (not shown), and the like.
- the storage unit 24 is realized by the memory 124, for example.
Abstract
Description
上述したように、従来技術においては、効率的な端末間通信を実現できない等の問題がある。まず、各実施形態を説明する前に、従来技術における問題の所在を説明する。この問題は、発明者が従来技術を仔細に検討した結果として新たに見出したものであり、従来は知られていなかったものであることに注意されたい。
第1実施形態は、無線端末20であって、所定周波数帯域を用いて無線局に対する上り送信を行う無線通信部と、前記無線端末20が他無線端末20と端末間通信を開始してから終了するまでの間における前記上り送信を間欠的に行うタイミングを示す信号を前記無線局から受信し、前記所定周波数帯域の内で該端末間通信のために割り当てられた周波数帯域を用いて、該端末間通信と該上り送信とを該信号に基づいて時分割で行うように前記無線通信部を制御する制御部とを備える無線端末20に係る実施形態である。
判定用信号の送信タイミングは、予め基地局10によって指示されてもよいし、無線端末20が何らかの事象を検出した場合に送信することとしてもよい。また、判定用信号の送信タイミングは、第1無線端末20aと第2無線端末20bとで共通のタイミング(共通のサブフレーム)でも良いし、異なるタイミング(異なるサブフレーム)であってもよい。
第2実施形態は第1実施形態の下位概念に相当しており、より効果的な端末間通信を、無線端末20の構成も踏まえて具体的に実現するものである。
次に図7に基づいて、各実施形態の無線通信システム1のネットワーク構成を説明する。図7に示すように、無線通信システム1は、基地局10と、無線端末20とを有する。なお、図7においては2台の無線端末20である無線端末20aと無線端末20bが例示されているが、これは一例にすぎないのは言うまでもない。基地局10は、セルC10を形成している。無線端末20はセルC10に存在している。なお、本願においては基地局10を「送信局」、無線端末20を「受信局」と称することがあることに注意されたい。
次に、図8~図9に基づいて、各実施形態の無線通信システムにおける各装置の機能構成を説明する。なお、上述したように、無線端末20と述べた場合には、上述した各実施形態における第1無線端末20aと第2無線端末20bとを含むことに留意されたい。
図10~図11に基づいて、各実施形態および各変形例の無線通信システムにおける各装置のハードウェア構成を説明する。なお、上述したように、無線端末20と述べた場合には、上述した各実施形態における第1無線端末20aと第2無線端末20bとを含むことに留意されたい。
2 ネットワーク
3 ネットワーク装置
10 基地局
C10 セル
20 無線端末
Claims (10)
- 無線端末であって、
所定周波数帯域を用いて無線局に対する上り送信を行う無線通信部と、
前記無線端末が他無線端末と端末間通信を開始してから終了するまでの間における前記上り送信を間欠的に行うタイミングを示す信号を前記無線局から受信し、前記所定周波数帯域の内で該端末間通信のために割り当てられた周波数帯域を用いて、該端末間通信と該上り送信とを該信号に基づいて時分割で行うように前記無線通信部を制御する制御部と
を備える無線端末。
- 前記タイミングは、周期的な単一の単位期間である
請求項1記載の無線端末。
- 前記単位期間はLTE(Long Term Evolution)標準におけるサブフレームである
請求項2記載の無線端末。
- 前記信号は、前記端末間通信を開始してから前記上り送信を間欠的に行うタイミングの内で該上り送信を最初に行うタイミングを示す情報と、前記周期を示す情報を含む
請求項2~3のいずれかに記載の無線端末。
- 前記制御部は、前記上り送信を間欠的に行うタイミングの間のそれぞれにおいて、前記無線端末から前記他無線端末への前記端末間通信と該他無線端末から該無線端末への該端末間通信とを交互に行うように前記無線通信部を制御する
請求項1に記載の無線端末。
- 前記上り送信を間欠的に行うタイミングは、前記割り当てられた周波数帯域を用いた送信と受信とを切り替えるタイミングを含む
請求項1に記載の無線端末。
- 前記タイミングは周期的なサブフレームであり、
前記送信と受信とを切り替えるタイミングは、前記サブフレームの最初または最後のシンボルである
請求項6記載の無線端末。
- 無線局であって、
所定周波数帯域を用いて無線端末から上り受信を行う無線通信部と、
前記無線端末が他無線端末と端末間通信を開始してから終了するまでの間における前記上り受信を間欠的に行うタイミングを示す信号を送信し、前記所定周波数帯域の内で該端末間通信のために割り当てられた周波数帯域を用いて、該端末間通信と該上り送信とを該信号に基づいて時分割で行うように前記無線端末と前記他無線端末を制御する制御部と
を備える無線局。
- 無線端末と他無線端末と無線局とを備える無線通信システムであって、
前記無線端末は、
所定周波数帯域を用いて前記無線局に対する上り送信を行う無線通信部と、
前記無線端末が前記他無線端末と端末間通信を開始してから終了するまでの間における前記上り送信を間欠的に行うタイミングを示す信号を前記無線局から受信し、前記所定周波数帯域の内で該端末間通信のために割り当てられた周波数帯域を用いて、該端末間通信と該上り送信とを該信号に基づいて時分割で行うように前記無線通信部を制御する制御部とを備える
無線通信システム。
- 所定周波数帯域を用いて無線局に対する上り送信を行う無線端末による無線通信方法であって、
前記無線端末が他無線端末と端末間通信を開始してから終了するまでの間における前記上り送信を間欠的に行うタイミングを示す信号を前記無線局から受信し、前記所定周波数帯域の内で該端末間通信のために割り当てられた周波数帯域を用いて、該端末間通信と該上り送信とを該信号に基づいて時分割で行うように前記無線通信部を制御する
無線通信方法。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020167029654A KR20160138487A (ko) | 2014-04-22 | 2014-04-22 | 무선 단말기, 무선국, 무선 통신 시스템 및 무선 통신 방법 |
EP14890303.2A EP3136817A4 (en) | 2014-04-22 | 2014-04-22 | Wireless terminal, wireless station, wireless communication system, and wireless communication method |
JP2016514545A JP6476476B2 (ja) | 2014-04-22 | 2014-04-22 | 無線端末、無線局、無線通信システム、および無線通信方法 |
CN201480078118.4A CN106233817A (zh) | 2014-04-22 | 2014-04-22 | 无线终端、无线站、无线通信系统和无线通信方法 |
CN202011238314.7A CN112423395B (zh) | 2014-04-22 | 2014-04-22 | 无线终端、无线站、无线通信系统和无线通信方法 |
PCT/JP2014/002266 WO2015162640A1 (ja) | 2014-04-22 | 2014-04-22 | 無線端末、無線局、無線通信システム、および無線通信方法 |
US15/283,800 US20170026954A1 (en) | 2014-04-22 | 2016-10-03 | Wireless terminal, wireless station, wireless communication system, and wireless communication method |
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US (1) | US20170026954A1 (ja) |
EP (1) | EP3136817A4 (ja) |
JP (1) | JP6476476B2 (ja) |
KR (1) | KR20160138487A (ja) |
CN (2) | CN106233817A (ja) |
WO (1) | WO2015162640A1 (ja) |
Cited By (1)
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WO2020008539A1 (ja) * | 2018-07-03 | 2020-01-09 | 株式会社Nttドコモ | 通信装置及び基地局 |
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EP3375244A1 (en) * | 2015-11-09 | 2018-09-19 | Sony Corporation | Telecommunications apparatuses and methods |
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-
2014
- 2014-04-22 WO PCT/JP2014/002266 patent/WO2015162640A1/ja active Application Filing
- 2014-04-22 EP EP14890303.2A patent/EP3136817A4/en not_active Withdrawn
- 2014-04-22 JP JP2016514545A patent/JP6476476B2/ja active Active
- 2014-04-22 CN CN201480078118.4A patent/CN106233817A/zh active Pending
- 2014-04-22 KR KR1020167029654A patent/KR20160138487A/ko not_active Application Discontinuation
- 2014-04-22 CN CN202011238314.7A patent/CN112423395B/zh active Active
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WO2020008539A1 (ja) * | 2018-07-03 | 2020-01-09 | 株式会社Nttドコモ | 通信装置及び基地局 |
CN112314029A (zh) * | 2018-07-03 | 2021-02-02 | 株式会社Ntt都科摩 | 通信装置及基站 |
JPWO2020008539A1 (ja) * | 2018-07-03 | 2021-07-15 | 株式会社Nttドコモ | 通信装置及び基地局 |
JP7364749B2 (ja) | 2018-07-03 | 2023-10-18 | 株式会社Nttドコモ | 通信装置、通信方法、及び無線通信システム |
US11917595B2 (en) | 2018-07-03 | 2024-02-27 | Ntt Docomo, Inc. | Communication device and base station |
CN112314029B (zh) * | 2018-07-03 | 2024-03-19 | 株式会社Ntt都科摩 | 通信装置及基站 |
Also Published As
Publication number | Publication date |
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US20170026954A1 (en) | 2017-01-26 |
EP3136817A4 (en) | 2017-05-03 |
JPWO2015162640A1 (ja) | 2017-04-13 |
EP3136817A1 (en) | 2017-03-01 |
CN112423395A (zh) | 2021-02-26 |
JP6476476B2 (ja) | 2019-03-06 |
CN112423395B (zh) | 2024-04-02 |
KR20160138487A (ko) | 2016-12-05 |
CN106233817A (zh) | 2016-12-14 |
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