WO2013168467A1 - 通信制御装置、通信制御方法及び端末装置 - Google Patents
通信制御装置、通信制御方法及び端末装置 Download PDFInfo
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- WO2013168467A1 WO2013168467A1 PCT/JP2013/056993 JP2013056993W WO2013168467A1 WO 2013168467 A1 WO2013168467 A1 WO 2013168467A1 JP 2013056993 W JP2013056993 W JP 2013056993W WO 2013168467 A1 WO2013168467 A1 WO 2013168467A1
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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
- 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
- H04W72/27—Control channels or signalling for resource management between access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/10—Dynamic resource partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
Definitions
- the present disclosure relates to a communication control device, a communication control method, and a terminal device.
- LTE Long Term Evolution
- 3GPP Third Generation Partnership Project
- LTE-Advanced is being studied as a standard for the fourth generation wireless communication system.
- frequency division duplex FDD
- TDD time division duplex
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- the ratio between uplink communication resources and downlink communication resources is fixed.
- TDD the ratio between uplink communication resources and downlink communication resources can be changed. is there. That is, in TDD, it is possible to change the ratio of uplink communication resources to downlink communication resources by changing the configuration in the link direction for each subframe in the radio frame. is there. Due to such merits, the use of TDD in a wireless communication system compliant with LTE or LTE-Advanced is expected to increase in the future. Therefore, various technologies related to LTE TDD have been proposed.
- Patent Document 1 discloses wireless communication between Home eNodeBs by moving a boundary between a downlink subframe and an uplink subframe and communicating with another Home NodeB in a subframe between the boundaries before and after the movement. Techniques for realizing it are disclosed.
- the ratio of uplink communication resources to downlink communication resources can be changed, so that configurations for different link directions are set for each cell in consideration of the amount of downlink or uplink traffic. It is also possible. However, if different link direction configurations are set for each cell, the link direction may be different between related cells in the same subframe, resulting in interference between the related cells. Can do. For example, when a user equipment (UE) receiving a downlink signal from an eNodeB in a certain cell receives an uplink signal of a UE in an adjacent cell adjacent to the cell, the uplink signal is May interfere with downlink signals. In order to further improve the throughput, when the configuration in the link direction is dynamically set according to the increase or decrease of the uplink or downlink traffic volume in each cell, the interference is controlled between the cells. It is very difficult.
- a wireless communication unit that communicates with one or more terminal devices in a cell on a channel that can dynamically set a link direction for each subframe, which is a unit of time in wireless communication, and the channel
- a communication control device comprising: a control unit that controls assignment of communication resources to the terminal device based on the setting of the link direction and the position of the terminal device in the cell.
- communicating with one or more terminal apparatuses in a cell on a channel in which a link direction for each subframe, which is a unit of time in wireless communication, can be dynamically set, and a link of the channel
- a communication control method including controlling allocation of communication resources to the terminal device based on a direction setting and a position of the terminal device in the cell.
- the wireless communication unit includes a wireless communication unit that communicates with a base station in a cell on a channel in which a link direction for each subframe that is a unit of time in wireless communication can be dynamically set.
- a terminal device that communicates with the base station according to allocation of communication resources to the base station by the base station based on the setting of the link direction of the channel and the position of the base station within the cell.
- the communication control device As described above, according to the present disclosure, according to the communication control device, the communication control method, and the terminal device, in a wireless communication system adopting TDD, the interference between related cells is suppressed while improving the throughput. It becomes possible.
- FIG. It is explanatory drawing for demonstrating an example of the format of the radio
- 6 is an explanatory diagram for describing an example of a configuration in a link direction for each subframe in a TDD radio frame.
- FIG. It is explanatory drawing for demonstrating an example of the interference in the sub-frame from which a link direction differs between adjacent cells. It is explanatory drawing for demonstrating the 1st example of the interference in the sub-frame from which a link direction differs between a macrocell and a small cell.
- 10 is an explanatory diagram for explaining an outline of a third embodiment. It is a block diagram which shows an example of a structure of eNodeB which concerns on 3rd Embodiment. It is a flowchart which shows an example of the schematic flow of the communication control process which concerns on 3rd Embodiment. It is explanatory drawing for demonstrating the outline of 4th Embodiment. It is a block diagram which shows an example of a structure of eNodeB which concerns on 4th Embodiment. It is a flowchart which shows an example of the schematic flow of the communication control process which concerns on 4th Embodiment.
- TDD Time Division Duplex in LTE
- FDD an uplink dedicated frequency band and a downlink dedicated frequency band are used in the frequency direction.
- FDD a radio frame format including 10 subframes is used in the time direction.
- TDD the same frequency band is used for both uplink and downlink communications.
- the format of the TDD radio frame will be described more specifically with reference to FIG.
- FIG. 1 is an explanatory diagram for explaining an example of a TDD radio frame format.
- a radio frame (Radio Frame) is a unit of time in LTE, and its length is 10 ms. Further, one radio frame includes 10 subframes (Sub-Frame). A subframe is also a unit of time in LTE, and its length is 1 ms.
- the link direction for each subframe is set. For example, in the radio frame shown in FIG. 1, the downlink direction is set as the link direction of the # 0 subframe, and the uplink direction is set as the link direction of the # 3 subframe.
- the uplink is communication from the UE to the eNodeB
- the downlink is communication from the eNodeB to the UE.
- D, U, and S indicate a downlink subframe, an uplink subframe, and a special subframe, respectively.
- the special subframe will be described later.
- FDD Frequency Division Duplex
- TDD has a merit from the viewpoint of securing a frequency band.
- FDD Frequency Division Duplex
- a pair of an uplink frequency band and a downlink frequency band must be secured.
- a single frequency band may be secured.
- TDD has a merit from the viewpoint of the ratio of uplink to downlink.
- the ratio of the uplink communication resource to the downlink communication resource is one pair. 1 is fixed.
- the ratio between uplink communication resources and downlink communication resources can be changed. That is, in TDD, by changing the configuration in the link direction for each subframe in a radio frame (hereinafter referred to as “TDD configuration”), the communication resource for uplink and the communication resource for downlink are changed. It is possible to change the ratio.
- TDD is expected to increase in the future in wireless communication systems compliant with LTE or LTE-Advanced.
- TDD has the above-mentioned advantages, but it is necessary to secure time for switching between the downlink and the uplink. Therefore, in TDD, a special subframe is inserted between a downlink subframe and an uplink subframe.
- the special subframe will be described more specifically with reference to FIG.
- FIG. 2 is an explanatory diagram for explaining an example of a special subframe included in a TDD radio frame.
- subframes # 0 to # 2 of the radio frame shown in FIG. 1 are shown.
- the subframe # 0 is a downlink subframe
- the subframe # 1 is a special subframe
- the subframe # 2 is an uplink subframe.
- the time for the UE to receive the downlink signal of the # 0 subframe is delayed from the time of the # 0 subframe in the format due to propagation delay in space and processing delay in the UE. To do.
- the special subframe is defined as an area for earning a delay time for the downlink and an advance time for the uplink. That is, the special subframe includes a downlink pilot time slot (DwPTS) and an uplink pilot time slot (UpPTS). In addition, the special subframe further includes a guard period (Guard Period).
- DwPTS downlink pilot time slot
- UpPTS uplink pilot time slot
- Guard Period guard period
- LTE TDD was defined in Release 8 of 3GPP.
- Table 42-2 Uplink-Downlink configurations, a configuration in the link direction for each subframe in a TDD radio frame (that is, a TDD configuration) is shown.
- TDD configuration will be described more specifically with reference to FIG.
- FIG. 3 is an explanatory diagram for explaining an example of the configuration in the link direction for each subframe in the TDD radio frame.
- 7GPP seven TDD configurations of Configurations 0 to 6 are defined.
- a radio frame includes 10 subframes, and a link direction for each subframe is set. Since the synchronization signal from the eNodeB is transmitted in the # 0 and # 5 subframes out of the 10 subframes, the link direction of the # 0 and # 5 subframes is always fixedly set to the downlink direction.
- the subframe # 1 is a special subframe in any TDD configuration. Also, the link direction of the # 2 subframe is fixedly set in the uplink direction.
- the subframe # 6 is either a special subframe or a downlink subframe.
- the link direction of the subframes # 3, # 4, # 7, # 8 and # 9 is set to either the uplink direction or the downlink direction.
- each operator selects and uses one of seven TDD configurations. Therefore, it is not assumed that each operator sets different TDD configurations between adjacent cells, for example.
- FIG. 4 is an explanatory diagram for explaining an example of interference in subframes having different link directions between adjacent cells.
- a cell 10a and a cell 10b adjacent to the cell 10a are shown.
- the eNodeB 11a and the UE 21a exist in the cell 10a
- the eNodeB 11b and the UE 21b exist in the cell 10b.
- the link direction in the cell 10a is the downlink direction
- the link direction in the cell 10b is the uplink direction.
- the UE 21a receiving the downlink signal 13 from the eNodeB 11a in the cell 10a receives the uplink signal 23 from the UE 21b in the cell 10b, so that the uplink signal 23 becomes the downlink signal 13. Can interfere.
- the eNodeB 11b receiving the uplink signal 23 from the UE 21b in the cell 10b receives the downlink signal 13 from the eNodeB 11a in the cell 10a, so that the downlink signal 13 interferes with the uplink signal 23. obtain. That is, the interference signal is shown by a dotted line in FIG.
- FIG. 5 is an explanatory diagram for explaining a first example of interference in subframes having different link directions between a macro cell and a small cell.
- a macro cell 30 and a small cell 40 are shown.
- the macro cell 30 overlaps part or the whole of the small cell 40.
- the eNodeB 31 and the UE 21 c exist in the macro cell 30, and the eNode B 41 and the UE 21 d exist in the small cell 40.
- the link direction in the macro cell 30 is the downlink direction
- the link direction in the small cell 40 is the uplink direction.
- the UE 21c receiving the downlink signal 33 from the eNodeB 31 in the macro cell 30 receives the uplink signal 25 from the UE 21d in the small cell 40b, so that the uplink signal 25 is the downlink signal 33. Can interfere.
- the eNodeB 41 receiving the uplink signal 25 from the UE 21 d in the small cell 40 receives the downlink signal 33 from the eNodeB 31 in the macro cell 30, so that the downlink signal 33 interferes with the uplink signal 25. Can do. That is, the interference signal is also indicated by a dotted line in FIG.
- FIG. 6 is an explanatory diagram for explaining a second example of interference in subframes having different link directions between a macro cell and a small cell.
- the macro cell 30 and the small cell 40 are shown as in FIG. 5.
- eNodeB 31, UE 21c, eNodeB 41 and UE 21d are shown in FIG. 5.
- the link direction in the macro cell 30 is an uplink direction
- the link direction in the small cell 40 is a downlink direction.
- the UE 21 d receiving the downlink signal 43 from the eNodeB 41 in the small cell 40 receives the uplink signal 27 from the UE 21 c in the macro cell 30, so that the uplink signal 27 is the downlink signal 43. Can interfere.
- the eNodeB 31 receiving the uplink signal 27 from the UE 21 c in the macro cell 30 receives the downlink signal 43 from the eNodeB 41 in the small cell 40, so that the downlink signal 43 interferes with the uplink signal 27. Can do. That is, in FIG. 6, the interference signal is indicated by a dotted line.
- the small cell 40 is a concept including a femtocell, a nanocell, a picocell, a microcell, and the like.
- the small cell 40 is a complementary cell for increasing the communication capacity of the macro cell 30 and can be introduced by installing an eNodeB smaller than the eNodeB of the macro cell.
- TDD configuration change As described above, setting different TDD configurations between related cells may cause interference between the related cells, while it is required to dynamically set the TDD configuration for each cell. ing. This is because throughput can be improved by selecting an appropriate TDD configuration according to the amount of uplink or downlink traffic in each cell. That is, when the amount of uplink traffic increases in a cell, a TDD configuration including more uplink subframes should be selected according to the increase in the amount of traffic. Further, when the downlink traffic volume increases in the cell, a TDD configuration including more downlink subframes should be selected according to the increase of the traffic volume. Since the characteristics of the traffic amount are different for each cell, it is desirable to dynamically set the TDD configuration independently for each cell. For example, since the length of the radio frame is 10 ms, it is conceivable to set the TDD configuration every 10 ms to several tens of ms.
- interference may be generated by setting different TDD configurations between related cells, but it is required to dynamically set a TDD configuration in the link direction in order to improve throughput.
- the TDD configuration is dynamically set in each cell (for example, every several tens of milliseconds), it is very difficult to control the interference between cells.
- the link direction for each subframe in the first frequency band is dynamically set, and the link direction for each subframe in the second frequency band is different in the link direction between adjacent cells.
- the link direction is set so as to be as small as possible.
- the communication resource of a 1st frequency band is not allocated to the terminal device located in the edge part of a cell.
- FIG. 7 is an explanatory diagram for explaining the outline of the first embodiment.
- a cell 10a and a cell 10b adjacent to the cell 10a are shown.
- the cell 10 is divided into an end portion far from the eNodeB 100-1 and a central portion other than the end portion (that is, a central portion close to the eNodeB 100-1).
- a TDD configuration is dynamically set at the center of the cell 10, while a TDD configuration that is the same as or similar to the TDD configuration of an adjacent cell is set at the end of the cell 10.
- the TDD configuration similar to the TDD configuration of the adjacent cell means a TDD configuration with few subframes having different link directions from the configuration of the adjacent cell.
- Configuration 3 and Configuration 4 shown in FIG. 3 have a common link direction in subframes excluding the # 4 subframe, and thus can be said to be TDD configurations similar to each other. Further, for example, at the end of the cell 10, the TDD configuration is set to be static or quasi-static.
- Carrier aggregation is a technique for improving the total throughput by bundling and using a plurality of CCs.
- the plurality of CCs include CC1 and CC2
- CC1 is used as a communication resource for UE 200 located in the center of cell 10
- CC2 is at the end (and center) of cell 10. Used as a communication resource for the UE 200 located.
- the TDD configuration is dynamically set according to the amount of traffic in the cell.
- the TDD configuration is set to a TDD configuration that is the same as or similar to the TDD configuration of the neighboring cell (for example, statically or semi-statically).
- the communication resource of the frequency band in which the link direction is dynamically set by such TDD configuration setting and communication resource assignment is assigned only to the UE 200 located in the center of the cell 10. Therefore, the transmission power of the communication resource can be reduced as will be described later.
- the uplink signal on the communication resource hardly interferes with the downlink signal of the adjacent cell
- the downlink signal on the communication resource hardly interferes with the uplink signal of the adjacent cell. That is, interference as shown in FIG. 4 hardly occurs in the frequency band where the link direction is dynamically set.
- Note that only communication resources in a frequency band with a small difference in link direction with the adjacent cell are allocated to the UE 200 located at the end of the cell 10, so naturally, in the frequency band, interference as shown in FIG. Hardly occurs. Therefore, in a radio communication system that employs TDD, it is possible to suppress interference between adjacent cells while improving throughput by dynamically setting a link direction.
- the eNodeB 100-1 allocates a small transmission power (for example, Power 1) to the downlink in CC1, and allocates a large transmission power (for example, Power 2) to the downlink in CC2.
- the eNodeB 100-1 is located in the center of the cell 10 and allocates a small transmission power (for example, Power 1) to the uplink in CC1 to the UE 200 to which CC1 communication resources are allocated for the uplink.
- the eNodeB 100-1 allocates a large transmission power (for example, Power 2) to the uplink in CC2 to the UE 200 that is located at the end of the cell 10 and to which the communication resources of CC2 are allocated for the uplink.
- FIG. 8 is a block diagram showing an example of the configuration of the eNodeB 100-1 according to the first embodiment.
- the eNodeB 100-1 includes a wireless communication unit 110, a network communication unit 120, a storage unit 130, and a processing unit 140.
- the radio communication unit 110 communicates with one or more UEs 200 in the cell 10 on a channel that can dynamically set a link direction for each subframe, which is a unit of time in radio communication.
- the channel includes, for example, at least a first frequency band and a second frequency band.
- Each of the first frequency band and the second frequency band is a component carrier. That is, the radio communication unit 110 communicates with the UE 200 in the cell 10 on CC1 and CC2 that can dynamically set the link direction for each subframe.
- wireless communication part 110 transmits the downlink signal to UE200 in the cell 10 according to resource allocation, and receives the uplink signal from UE200 in the cell 10.
- the wireless communication unit 110 includes, for example, an antenna and an RF circuit.
- the network communication unit 120 communicates with communication nodes including other eNodeBs.
- the X2 interface between the eNodeBs can be realized via the network communication unit 120.
- the network communication unit 120 may include a wireless communication module that can be shared with the wireless communication unit 110, or may include a wired communication module such as a LAN connection terminal.
- the storage unit 130 stores a program and data for the operation of the eNodeB 100-1.
- the storage unit 130 includes a storage medium such as a hard disk or a semiconductor memory.
- the processing unit 140 provides various functions of the eNodeB 100-1.
- the processing unit 140 corresponds to a processor such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processor), and executes various programs described above by executing programs stored in the storage unit 130 or other storage media. I will provide a.
- the processing unit 140 includes a terminal position measurement unit 141, a traffic amount measurement unit 143, a link direction setting unit 145, a resource control unit 147, and a power control unit 149.
- the terminal location measuring unit 141 measures the location of the UE 200 in the cell 10. The position is indicated by the distance between the eNodeB 100-1 and the UE 200, for example. For example, the terminal location measurement unit 141 measures the distance between the eNodeB 100-1 and the UE 200 from the timing advance value for each UE 200.
- the traffic volume measuring unit 143 measures the uplink traffic volume and the downlink traffic volume in the cell 10.
- the traffic amount measurement unit 143 may measure the actual value of the traffic amount within a predetermined period, or measure the estimated value of the traffic amount predicted for the predetermined period based on a scheduling request from the UE 200 or the like May be. Further, the traffic volume measuring unit 143 may measure the traffic volume at the end of the cell 10 and the traffic volume at the center of the cell 10 separately, or collectively without distinguishing both traffic volumes. You may measure with.
- the link direction setting unit 145 dynamically sets the link direction for each subframe in the first frequency band, and associates the link direction for each subframe in the second frequency band with the cell 10 and the cell 10. It is set so that the difference in the link direction with the related cell is reduced.
- the related cell is an adjacent cell adjacent to the cell 10.
- the link direction setting unit 145 dynamically sets the TDD configuration of CC1 according to the amount of uplink or downlink traffic.
- the TDD configuration of CC1 is set every 10 ms to several tens of ms.
- the link direction setting unit 145 sets the TDD configuration of CC2 to the same or similar TDD configuration as the TDD configuration of CC2 of the adjacent cell.
- the link direction setting unit 145 negotiates with the eNodeB 100-1 of the adjacent cell for setting the link direction of CC2 based on the measured traffic volume via the network communication unit 120.
- the interface between the eNodeB 100-1 of the cell 10 and the eNodeB 100-1 of the neighboring cell is an X2 interface.
- the link direction setting unit 145 sets the link direction for each subframe in the second frequency band statically or semi-statically. For example, the link direction setting unit 145 sets the TDD configuration of CC2 statically or semi-statically. As an example, the link direction setting unit 145 sets the TDD configuration of CC2 every time a predetermined time elapses. The predetermined time is longer than the set cycle of CC1. Such static or quasi-static setting makes it possible to minimize communication and processing for adjusting the TDD configuration between eNodeBs.
- the resource control unit 147 controls allocation of communication resources to the UE 200 based on the link direction setting of the channel that can dynamically set the link direction for each subframe and the position of the UE 200 in the cell 10. In particular, in the present embodiment, the resource control unit 147 does not allocate communication resources in the first frequency band to the UE 200 located at the end of the cell 10. For example, the resource control unit 147 does not assign the communication resource of CC1 to the UE 200 located at the end of the cell 10, and CC1 is assigned to the UE 200 that is not located at the end of the cell 10 (that is, the UE 200 located at the center of the cell 10). Allocate communication resources. Further, for example, the resource control unit 147 allocates CC2 communication resources to the UE 200 located at the end of the cell 10 (and the center of the cell 10).
- the power control unit 149 controls transmission power in the cell 10. For example, the power control unit 149 controls transmission power from the wireless communication unit 110. For example, the power control unit 149 allocates a small transmission power to the downlink in the first frequency band (for example, CC1), and assigns a large transmission power to the downlink in the second frequency band (for example, CC2). assign.
- a small transmission power to the downlink in the first frequency band for example, CC1
- assigns a large transmission power to the downlink in the second frequency band for example, CC2. assign.
- the eNodeB 100-1 is located in the center of the cell 10 and the first frequency band (eg, CC1) is allocated to the UE 200 assigned for uplink communication resources of the first frequency band (for example, CC1). Assign a small transmission power to the uplink in the band. Further, the eNodeB 100-1 is located at the end of the cell 10 and the communication resource of the second frequency band (for example, CC2) is allocated to the UE 200 allocated for uplink in the second frequency band. Allocate a large transmission power to the uplink.
- the first frequency band eg, CC1
- the eNodeB 100-1 is located at the end of the cell 10 and the communication resource of the second frequency band (for example, CC2) is allocated to the UE 200 allocated for uplink in the second frequency band. Allocate a large transmission power to the uplink.
- FIG. 9 is a block diagram illustrating an example of the configuration of the UE 200 according to the first embodiment.
- the UE 200 includes a radio communication unit 210, a storage unit 220, and a processing unit 230.
- the radio communication unit 210 communicates with the eNodeB 100-1 in the cell 10 on a channel that can dynamically set the link direction for each subframe, which is a unit of time in radio communication.
- the radio communication unit 210 communicates with the eNodeB 100-1 according to the allocation of communication resources to the own device by the eNodeB 100-1 based on the setting of the link direction of the channel and the position of the own device in the cell 10.
- the channel includes at least a first frequency band and a second frequency band.
- Each of the first frequency band and the second frequency band is a component carrier. That is, the radio communication unit 210 communicates with the eNodeB 100-1 in the cell 10 on CC1 and CC2 that can dynamically set the link direction for each subframe.
- the radio communication unit 210 assigns the communication resources. Communicate according to.
- the wireless communication unit 110 includes, for example, an antenna and an RF circuit.
- the storage unit 220 stores a program and data for the operation of the UE 200.
- the storage unit 220 includes a storage medium such as a hard disk or a semiconductor memory.
- the processing unit 230 provides various functions of the UE 200.
- the processing unit 230 corresponds to a processor such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processor), and executes the various functions described above by executing programs stored in the storage unit 220 or another storage medium. I will provide a.
- the processing unit 230 controls communication of the wireless communication unit 210.
- the processing unit 230 acquires system information from the downlink signal received by the wireless communication unit 210. Further, the processing unit 230 recognizes the set TDD configuration from the system information. For example, in the downlink signal of each CC, system information for each CC is acquired, and the TDD configuration for each CC is recognized from the system information for each CC. Then, the processing unit 230 causes the wireless communication unit 210 to communicate based on the recognized TDD configuration.
- the processing unit 230 acquires uplink and downlink scheduling information from the downlink signal received by the wireless communication unit 210. Further, the processing unit 230 recognizes allocation of communication resources to the UE 200 from the scheduling information. Then, the processing unit 230 causes the wireless communication unit 210 to communicate according to the communication resource assignment.
- FIG. 10 is a flowchart illustrating an example of a schematic flow of a communication control process according to the first embodiment.
- the communication control process is a process in the eNodeB 100-1.
- step S501 the terminal location measurement unit 141 measures the location of the UE 200 in the cell 10.
- step S503 the traffic volume measurement unit 143 measures the uplink traffic volume and the downlink traffic volume in the cell 10.
- step S505 the link direction setting unit 145 sets the link direction (that is, TDD configuration) of CC1 based on the measured traffic volume.
- step S507 the link direction setting unit 145 determines whether a predetermined time has elapsed. If the predetermined time has elapsed, the process proceeds to step S509. Otherwise, the process proceeds to step S513.
- step S509 the link direction setting unit 145 negotiates with the eNodeB 100-1 of the neighboring cell for setting of the link direction of CC2 based on the measured traffic volume via the network communication unit 120.
- step S511 the link direction setting unit 145 sets the link direction (ie, TDD configuration) of CC2 based on the result of negotiation with the eNodeB 100-1 of the neighboring cell.
- step S513 the resource control unit 147 allocates CC2 communication resources to the UE 200 located at the end of the cell 10 (and the center of the cell 10).
- step S515 the resource control unit 147 allocates the communication resource of CC1 to the UE 200 that is not located at the end of the cell 10 (that is, the UE 200 that is located at the center of the cell 10).
- step S517 the radio communication unit 110 communicates with the UE 200 using the allocated communication resource.
- the cell 10 is a macro cell that overlaps with a part or the whole of the small cell.
- the eNodeB 100-1 sets the link direction for each subframe in the small cell so that the difference in the link direction between the cell 10 and the small cell is reduced (for example, the eNodeB) To set.
- the outline of the modification of the first embodiment will be described more specifically with reference to FIG.
- FIG. 11 is an explanatory diagram for explaining an outline of a modified example of the first embodiment.
- a cell 10 that is a macro cell and two small cells 40 are shown.
- Cell 10 is similar to cell 10 described with reference to FIG. That is, in cell 10, CC1 is used as a communication resource for UE 200 located in the center of cell 10, and CC2 is used as a communication resource for UE 200 located in the end (and center) of cell 10. used.
- the small cell 40 a is located at the end of the cell 10, and the small cell 40 b is located at the center of the cell 10.
- the eNodeB 100-1 causes the eNodeB 41a to set the TDD configuration of the CC2 of the small cell 40a to the same or similar to the TDD configuration of the CC2 of the cell 10. Also, the eNodeB 100-1 causes the eNodeB 41b to set the TDD configuration of CC1 of the small cell 40b to the same or similar TDD configuration as the TDD configuration of CC1 of the cell 10.
- the small cell 40 may also be divided into an end portion far from the eNodeB 41 and a central portion other than the end portion (that is, a central portion close to the eNodeB 41), similarly to the cell 10.
- a central portion close to the eNodeB 41 similarly to the cell 10.
- FIG. 12 is an explanatory diagram for explaining operations of the eNodeB 41 and the UE 200 in the small cell 40.
- the small cells 40a and 40b also shown in FIG. 11 are shown.
- the eNodeB 41a of the small cell 40a dynamically sets the link direction for each subframe of the CC different from CC2, and communicates with the UE 200e located at the end of the small cell 40a in the other frequency band. Do not allocate resources.
- the eNodeB 41a allocates communication resources in the different frequency band to the UE 200f located in the center of the small cell 40a.
- the eNodeB 41b of the small cell 40b dynamically sets the link direction for each subframe of the CC different from CC1, and allocates communication resources of the different frequency band to the UE 200g located at the end of the small cell 40b. Do not assign.
- the eNodeB 41b allocates communication resources in the different frequency band to the UE 200h located in the center of the small cell 40b.
- the communication resource of the frequency band (that is, the other frequency band) in which the link direction is dynamically set by such resource allocation is allocated only to the UE 200 located in the center of the small cell 40. Therefore, the transmission power of the communication resource can be reduced in the small cell.
- the uplink signal on the communication resource of the small cell hardly interferes with the downlink signal of the cell 10
- the downlink signal on the communication resource of the small cell hardly affects the uplink signal of the macro cell. Does not interfere. That is, in the frequency band in which the link direction is dynamically set, interference from the small cell side to the macro cell side as shown in FIGS. 5 and 6 hardly occurs.
- the downlink signal of the cell 10 is almost equal to the uplink signal of the small cell 40. Does not interfere. Further, since the distance between the UE 200 located in the center of the small cell 40 and the eNodeB 41 is smaller than the distance between the UE 200 and the UE 200 communicating with the eNodeB 100-1, the uplink signal of the cell 10 Little interference with downlink signals. That is, in the frequency band in which the link direction is dynamically set, interference from the macro cell side to the small cell side as shown in FIGS. 5 and 6 hardly occurs.
- the link direction setting unit 145 and the power control unit 149 of the eNodeB 100-1 described with reference to FIG. 8 further operate as follows. Note that, as described above, in this modification, the cell 10 is a macro cell that overlaps a part or the whole of the small cell 40.
- the link direction setting unit 145 causes the eNodeB 41 of the small cell 40 to set the link direction for each subframe in the small cell 40 so that the difference in the link direction between the cell 10 and the small cell 40 is reduced. That is, the link direction setting unit 145 causes the eNodeB 41 to set the TDD configuration of the small cell 40 to the same or similar TDD configuration as the TDD configuration of the cell 10.
- the link direction setting unit 145 determines the link direction of the second frequency band in the small cell 40 between the cell 10 and the small cell 40 when the small cell 40 is located at the end of the cell 10.
- the eNodeB 41 is set so as to reduce the difference in the link direction. That is, the link direction setting unit 145 causes the eNodeB 41a to set the TDD configuration of CC2 in the small cell 40a to the same or similar TDD configuration as the TDD configuration of CC2 in the cell 10. In this case, for example, similarly to the TDD configuration of CC2 of the cell 10, the TDD configuration of CC2 in the small cell 40a is set to be static or semi-static.
- the link direction setting unit 145 determines the link direction of the first frequency band in the small cell 40 between the cell 10 and the small cell 40.
- the eNodeB 41 is set so as to reduce the difference in the link direction between them. That is, the link direction setting unit 145 causes the eNodeB 41b to set the TDD configuration of CC1 in the small cell 40b to the same or similar TDD configuration as the TDD configuration of CC1 in the cell 10. In this case, for example, similarly to the TDD configuration of CC1 of the cell 10, the TDD configuration of CC1 in the small cell 40b is dynamically set.
- the link direction setting unit 145 sets the link direction for each subframe in the first frequency band set by the link direction setting unit 145 or for each subframe in the second frequency band.
- the link direction of the eNodeB 41 is notified.
- the link direction setting unit 145 causes the eNodeB 41 to set the link direction for each subframe in the small cell 40.
- the link direction setting unit 145 performs the above notification to the eNodeB 41 via the network communication unit 120, for example.
- the eNodeB 41 when the small cell 40 is located at the end of the cell 10, the eNodeB 41 has a link direction for each subframe in a frequency band different from the second frequency band. May be set dynamically, and communication resources in the different frequency band may not be assigned to the UE 200 located at the end of the small cell 40. That is, the eNodeB 41 may dynamically set a TDD configuration of a CC different from the CC 2 and may not allocate communication resources of the other CC to the UE 200e located at the end of the small cell 40a.
- the eNodeB 41 when the small cell 40 is not located at the end of the cell 10, the eNodeB 41 is a link for each subframe in a frequency band different from the first frequency band.
- the direction may be dynamically set, and the communication resource of the other frequency band may not be assigned to the terminal device located at the end of the small cell 40. That is, the eNodeB 41 may dynamically set a TDD configuration of a CC different from the CC1, and may not allocate communication resources of the other CC to the UE 200g located at the end of the small cell 40b.
- the power control unit 149 may reduce the transmission power in the cell 10 in subframes in which the link direction in the cell 10 and the link direction in the small cell 40 are different. For example, the power control unit 149 decreases the transmission power of CC2 in the cell 10 in a subframe in which the link direction of CC2 in the cell 10 and the link direction in CC2 of the small cell 40a are different. Further, for example, the power control unit 149 reduces the transmission power of CC1 in the cell 10 in a subframe in which the link direction of CC1 in the cell 10 and the link direction in CC1 in the small cell 40b are different. In this case, for example, the power control unit 149 is notified of the link direction (that is, TDD configuration) in the small cell 40 by the eNodeB 41 via the network communication unit 120.
- the link direction that is, TDD configuration
- the subframe used for communication is selected according to the downlink or uplink traffic volume in the small cell 40. May be. That is, the ratio between the uplink subframe and the downlink subframe in the radio frame may be changed in accordance with the downlink or uplink traffic volume.
- FIG. 13 is an explanatory diagram for explaining an example of selection of subframes used for communication in the small cell.
- a TDD configuration corresponding to Configuration 1 in FIG. 3 is set in CC1 used as a communication resource of UE 200 located in the center of cell 10.
- a TDD configuration corresponding to Configuration 3 in FIG. 3 is set in CC 2 used as a communication resource of UE 200 located at the end of cell 10.
- the downlink traffic volume is larger than the uplink traffic volume, so that more downlink subframes are selected as subframes used for communication.
- the amount of uplink traffic is larger than the amount of downlink traffic, so more uplink subframes are selected as subframes used for communication.
- the downlink traffic volume is larger than the uplink traffic volume, so that more downlink subframes are selected as subframes used for communication. Is done.
- the amount of uplink traffic is larger than the amount of downlink traffic, so more uplink subframes are selected as subframes used for communication.
- FIG. 14 is a flowchart illustrating an example of a schematic flow of a communication control process according to a modification of the first embodiment.
- the communication control process is a process in the eNodeB 100-1.
- step S521 which is the difference between the example of the communication control process according to the first embodiment described with reference to FIG. 10 and the example of the communication control process according to the modification, will be described.
- step S521 the link direction setting unit 145 notifies the eNodeB 41 of the link direction for each subframe of CC1 or the link direction for each subframe of CC2 set by the link direction setting unit 145. Thereby, the link direction setting unit 145 causes the eNodeB 41 to set the link direction for each subframe in the small cell 40.
- the link direction setting unit 145 performs the above notification to the eNodeB 41 via the network communication unit 120, for example.
- Second Embodiment >> ⁇ 3.1. Overview>
- attention is paid to the operation of the eNodeB of a cell adjacent to another cell.
- attention is paid to the operation of the eNodeB of the macro cell when the cell adjacent to another cell is a macro cell.
- attention is paid to the operation of an eNodeB of a small cell partially or entirely overlapped with a macro cell.
- the link direction for each subframe of the first frequency band is dynamically set, and the link direction for each subframe of the second frequency band is set to the small cell and the macro cell.
- the eNodeB 100-2 is a small cell eNodeB.
- the cell 10 which is a small cell is shown in more detail.
- the cell 10 is divided into an end portion far from the eNodeB 100-2 and a central portion other than the end portion (that is, a central portion close to the eNodeB 100-2).
- the TDD configuration is dynamically set at the center of the cell 10, while the same or similar TDD configuration as that of the macro cell is set at the end of the cell 10. Further, for example, at the end of the cell 10, the TDD configuration is set to be static or quasi-static.
- a mechanism of carrier aggregation which is a technique for bundling and using a plurality of cells is used.
- the plurality of CCs include CC1 and CC2, CC1 is used as a communication resource for the UE 200 located in the center of the cell 10, and CC2 is located in the end (and center) of the cell 10. Used as a communication resource for UE 200.
- the TDD configuration is dynamically set according to traffic.
- the TDD configuration is set, for example, statically or quasi-statically so as to be the same or similar to the TDD configuration of the macro cell TDD configuration.
- communication resources in the frequency band in which the link direction is dynamically set in the cell 10 are limited to only the UE 200 located in the center of the cell 10 that is a small cell. Assigned. Therefore, in the cell 10, the transmission power of the communication resource can be reduced. As a result, the uplink signal on the communication resource of the cell 10 hardly interferes with the downlink signal of the macro cell 30, and the downlink signal on the communication resource of the cell 10 becomes the uplink signal of the macro cell 30. Almost no interference. That is, in the frequency band in which the link direction is dynamically set, interference from the small cell side to the macro cell side as shown in FIGS. 5 and 6 hardly occurs.
- the downlink signal of the macro cell 30 Little interference with link signal. Further, since the distance between the UE 200 located in the center of the cell 10 and the eNodeB 100-2 is smaller than the distance between the UE 200 and the UE 200 communicating with the eNodeB 31, the uplink signal of the macro cell 30 is the downlink of the cell 10. Little interference with the signal. That is, in the frequency band in which the link direction is dynamically set, interference from the macro cell side to the small cell side as shown in FIGS. 5 and 6 hardly occurs.
- FIG. 17 is a block diagram illustrating an example of the configuration of the eNodeB 100-2 according to the second embodiment.
- the eNodeB 100-2 includes a wireless communication unit 110, a network communication unit 120, a storage unit 130, and a processing unit 150.
- the wireless communication unit 110 the network communication unit 120, and the storage unit 130
- the processing units 150 the terminal position measurement unit 141, the traffic volume measurement unit 143, and the resource control unit 147 also have no difference between the first embodiment and the second embodiment. Therefore, here, the link direction setting unit 155 and the power control unit 159 will be described.
- the link direction setting unit 155 dynamically sets the link direction for each subframe of the first frequency band, and associates the link direction for each subframe of the second frequency band with the cell 10 and the cell 10. It is set so that the difference in the link direction with the related cell is reduced.
- the cell 10 is a small cell
- the related cell is a macro cell 30 that overlaps a part or the whole of the cell 10.
- the link direction setting unit 155 dynamically sets the TDD configuration of CC1 according to the uplink or downlink traffic volume.
- the TDD configuration of CC1 is set every 10 ms to several tens of ms.
- the link direction setting unit 155 sets the TDD configuration of CC2 to the same or similar TDD configuration as the TDD configuration of CC2 of the macro cell 30.
- the link direction setting unit 155 is notified of the TDD configuration of CC2 of the macro cell 30 by the eNodeB 31 via the network communication unit 120.
- communication resources in a frequency band corresponding to the position of the UE 200 may be assigned to the UE.
- the second frequency band (for example, CC2) is a frequency band assigned to the UE 200 located at the end of the macro cell 30.
- the second frequency band is not located at the end of the macro cell 30 (ie, located at the center). )
- a frequency band assigned to the UE 200 may be used.
- the power control unit 159 controls transmission power in the cell 10. For example, the power control unit 159 controls transmission power by the wireless communication unit 110. For example, the power control unit 159 allocates a small transmission power to the downlink in the first frequency band (for example, CC1), and assigns a large transmission power to the downlink in the second frequency band (for example, CC2). assign.
- a small transmission power to the downlink in the first frequency band for example, CC1
- assigns a large transmission power to the downlink in the second frequency band for example, CC2. assign.
- the eNodeB 100-2 is located in the center of the cell 10 and the first frequency band (for example, CC1) is assigned to the UE 200 assigned for uplink communication resources of the first frequency band (for example, CC1). Assign a small transmission power to the uplink in the band.
- the eNodeB 100-1 is located at the end of the cell 10 and the communication resource of the second frequency band (for example, CC2) is allocated to the UE 200 allocated for uplink in the second frequency band. Allocate a large transmission power to the uplink.
- the power control unit 159 reduces transmission power in the macro cell 30 in a subframe in which the link direction of the second frequency band in the cell 10 and the link direction of the second frequency band in the macro cell 30 are different.
- the request may be made to the eNodeB 31 of the macro cell 30.
- the power control unit 159 notifies the eNodeB 31 of subframes in which the CC2 link direction in the cell 10 and the CC2 link direction in the macro cell 30 are different via the network communication unit 120.
- the interference of the downlink signal of the macro cell 30 to the uplink signal of the cell 10 and the interference of the uplink signal of the macro cell 30 to the downlink signal of the cell 10 are further increased. Can be suppressed.
- FIG. 18 is a flowchart illustrating an example of a schematic flow of a communication control process according to the second embodiment.
- the communication control process is a process in the eNodeB 100-2.
- Steps S501 to S505 and S511 to S517 of the communication control process according to the first embodiment described with reference to FIG. 10 are steps S601 to S605 and S611 of the communication control process according to the second embodiment, respectively. This corresponds to S617. Therefore, here, only step S607, which is the difference between the example of the communication control process according to the first embodiment described with reference to FIG. 10 and the example of the communication control process according to the second embodiment. Will be explained.
- step S607 the link direction setting unit 155 determines whether the eNodeB 31 has notified the CC2 link direction (that is, the TDD configuration) of the macro cell 30 via the network communication unit 120. If the link direction is notified, the process proceeds to step S611. Otherwise, the process proceeds to step S613.
- FIG. 19 is an explanatory diagram for explaining the outline of the third embodiment.
- a cell 10a and a cell 10b adjacent to the cell 10a are shown.
- the link direction (that is, TDD configuration) for each subframe is dynamically set.
- a TDD configuration corresponding to Configuration 0 in FIG. 3 is set in each frequency band.
- a TDD configuration corresponding to the configuration 6 in FIG. 3 is set in each frequency band.
- the subframe in which the link direction of the cell 10a and the link direction of the cell 10b are different is the subframe of # 9. Therefore, interference as shown in FIG.
- the communication resources in the # 0 to # 8 subframes can be allocated to any UE 200, but the communication resource in the # 9 subframe is allocated to the UE 200 located at the end of the cell 10. I can't. That is, communication resources in the subframe # 9 are allocated only to UE 200 located in the center of cell 10.
- FIG. 20 is a block diagram illustrating an example of the configuration of the eNodeB 100-3 according to the third embodiment.
- the eNodeB 100-3 includes a wireless communication unit 110, a network communication unit 120, a storage unit 130, and a processing unit 160.
- the wireless communication unit 110 the network communication unit 120, and the storage unit 130
- the terminal position measurement unit 141 and the traffic amount measurement unit 143 are also not different between the first embodiment and the third embodiment. Therefore, here, the link direction setting unit 165, the resource control unit 167, and the power control unit 169 will be described.
- the link direction setting unit 165 dynamically sets the link direction for each subframe of one or more frequency bands.
- the one or more frequency bands include CC1 and CC2.
- the link direction setting unit 165 dynamically sets one of the TDD configurations shown in FIG. 3 in CC1 and CC2 according to the uplink or downlink traffic volume.
- the TDD configuration is set every 10 ms to several tens of ms.
- the same TDD configuration may be set for CC1 and CC2, or different TDD configurations may be set.
- the link direction setting unit 165 notifies the adjacent cell of the link direction (that is, TDD configuration) in the cell 10 via the network communication unit 120, for example.
- the resource control unit 167 controls allocation of communication resources to the UE 200 based on the setting of the link direction of the channel that can dynamically set the link direction for each subframe and the position of the UE 200 in the cell 10. In particular, in the present embodiment, the resource control unit 167 positions communication resources in subframes in which the link direction in the cell 10 and the link direction in the related cell related to the cell 10 are different at the end of the cell 10. Not assigned to UE 200.
- the related cell is an adjacent cell adjacent to the cell 10. For example, when the subframe in which the link direction is different between the cell 10 and the adjacent cell is the subframe # 9, the resource control unit 167 assigns the communication resource in the subframe # 9 to the end of the cell 10.
- the resource control unit 167 allocates communication resources in the subframe of # 9 only to the UE 200 located in the center of the cell 10. Resource control section 167 allocates communication resources in subframes # 0 to # 8 to UE 200 located at the end of cell 10 and UE 200 located in the center of cell 10.
- the resource control unit 167 is notified of the link direction (ie, TDD configuration) in the neighboring cell by the eNodeB 100-3 of the neighboring cell.
- the power control unit 169 controls transmission power in the cell 10. For example, the power control unit 169 decreases the transmission power in the cell 10 in a subframe in which the link direction in the cell 10 and the link direction in the adjacent cell adjacent to the cell 10 are different. More specifically, the power control unit 169 allocates a small transmission power to the downlink. Moreover, the power control unit 169 causes the UE 200 located in the center of the cell 10 to allocate a small transmission power to the uplink.
- FIG. 21 is a flowchart illustrating an example of a schematic flow of a communication control process according to the third embodiment.
- the communication control process is a process in the eNodeB 100-3.
- step S701 the terminal location measuring unit 141 measures the location of the UE 200 in the cell 10.
- step S703 the traffic volume measurement unit 143 measures the uplink traffic volume and the downlink traffic volume in the cell 10.
- step S705 the link direction setting unit 165 sets the link direction (ie, TDD configuration) for each subframe based on the measured traffic volume.
- step S707 the link direction setting unit 165 notifies the adjacent cell of the link direction in the cell 10 via the network communication unit 120, for example.
- step S709 the resource control unit 167 is notified of the link direction (that is, the TDD configuration) in the adjacent cell by the adjacent cell.
- step S711 the resource control unit 167 does not locate communication resources in subframes in which the link direction in the cell 10 is different from the link direction in the adjacent cell adjacent to the cell 10 at the end of the cell 10 (that is, Assigned to UE 200 (located in the center of cell 10).
- step S713 the resource control unit 167 also sets the communication resource in the subframe in which the link direction in the cell 10 and the link direction in the adjacent cell adjacent to the cell 10 are the same as the UE 200 located in the cell 10. Assign to.
- step S715 the radio communication unit 110 communicates with the UE 200 using the allocated communication resource.
- FIG. 22 is an explanatory diagram for explaining the outline of the fourth embodiment.
- a cell 10 that is a small cell and a macro cell 30 that overlaps a part or the whole of the cell 10 are shown.
- the link direction (that is, TDD configuration) for each subframe is dynamically set.
- the link direction (that is, TDD configuration) for each subframe may be set dynamically, or may be set statically or semi-statically.
- a TDD configuration corresponding to Configuration 6 in FIG. 3 is set in each frequency band.
- the subframe in which the link direction of the cell 10 and the link direction of the macro cell 30 are different is the subframe of # 9. Therefore, interference as shown in FIGS. 5 and 6 does not occur in the subframes # 0 to # 8, whereas interference as shown in FIGS. 5 and 6 may occur in the subframe # 9. . Therefore, in the present embodiment, communication resources in subframes # 0 to # 8 can be allocated to any UE 200 in cell 10, but communication resources in subframe # 9 are located at the end of cell 10. It is not assigned to UE200 to do. That is, in the cell 10, the communication resource in the subframe # 9 is allocated only to the UE 200 located in the center of the cell 10.
- the communication resource is located in the center of the cell 10. Assigned only to the UE 200 located. Therefore, in the cell 10, the transmission power in the subframe can be reduced. As a result, in the subframe, the uplink signal of the cell 10 hardly interferes with the downlink signal of the macro cell 30, and the downlink signal of the cell 10 hardly interferes with the uplink signal of the macro cell 30. That is, even in a subframe in which the link direction is different between adjacent cells, interference from the small cell side to the macro cell side as shown in FIGS. 5 and 6 hardly occurs.
- the downlink signal of the macro cell 30 Little interference with link signal. Also, since the distance between the UE 200 located in the center of the cell 10 and the eNodeB 100-4 is smaller than the distance between the UE 200 and the UE 200 communicating with the eNodeB 31, the uplink signal of the macro cell 30 is the downlink of the cell 10. Little interference with the signal. That is, even in a subframe in which the link direction is different between adjacent cells, interference from the macro cell side to the small cell side as shown in FIGS. 5 and 6 hardly occurs.
- interference as shown in FIGS. 5 and 6 does not occur even in a subframe of the radio frame in which the link direction is the same between the cell 10 and the macrocell 30.
- FIG. 23 is a block diagram illustrating an example of a configuration of the eNodeB 100-4 according to the fourth embodiment.
- the eNodeB 100-4 includes a wireless communication unit 110, a network communication unit 120, a storage unit 130, and a processing unit 170.
- the wireless communication unit 110 the network communication unit 120, and the storage unit 130
- the processing unit 170 the terminal position measurement unit 141, the traffic volume measurement unit 143, and the link direction setting unit 165 are also not different between the third embodiment and the fourth embodiment. Therefore, here, the resource control unit 177 and the power control unit 179 will be described.
- the resource control unit 177 controls allocation of communication resources to the UE 200 based on the setting of the link direction of the channel that can dynamically set the link direction for each subframe and the position of the UE 200 in the cell 10. In particular, in this embodiment, the resource control unit 177 locates communication resources in subframes in which the link direction in the cell 10 and the link direction in the related cell related to the cell 10 are different at the end of the cell 10. Not assigned to UE 200.
- the cell 10 is a small cell
- the related cell is a macro cell overlapping with a part or the whole of the cell 10.
- the resource control unit 177 allocates the communication resources in the subframe # 9 to the end of the cell 10. Is not assigned to UE 200 located in That is, the resource control unit 177 allocates communication resources in the subframe of # 9 only to the UE 200 located at the center of the cell 10.
- Resource control section 167 allocates communication resources in subframes # 0 to # 8 to UE 200 located at the end of cell 10 and UE 200 located in the center of cell 10.
- the resource control unit 177 is notified of the link direction (that is, the TDD configuration) in the macro cell 30 by the eNodeB 31 of the macro cell 30.
- the power control unit 179 controls transmission power in the cell 10. For example, the power control unit 179 reduces the transmission power in the cell 10 in subframes in which the link direction in the cell 10 and the link direction in the macro cell 30 are different. More specifically, the power control unit 179 allocates a small transmission power to the downlink. Also, the power control unit 179 causes the UE 200 located in the center of the cell 10 to allocate a small transmission power to the uplink.
- the power control unit 179 causes the eNodeB 31 of the macro cell 30 to reduce the transmission power in the macro cell 30 in a subframe in which the link direction in the cell 10 and the link direction in the macro cell 30 are different. You may request. For example, the power control unit 179 notifies the eNodeB 31 of subframes in which the link direction in the cell 10 and the link direction in the macro cell 30 are different via the network communication unit 120. By reducing the transmission power in the macro cell 30 in this way, the interference of the downlink signal of the macro cell 30 to the uplink signal of the cell 10 and the interference of the uplink signal of the macro cell 30 to the downlink signal of the cell 10 are further increased. Can be suppressed.
- FIG. 24 is a flowchart illustrating an example of a schematic flow of a communication control process according to the fourth embodiment.
- the communication control process is a process in the eNodeB 100-4. Steps S701 to S705 and S715 of the communication control process according to the third embodiment described with reference to FIG. 21 correspond to steps S801 to S805 and S815 of the communication control process according to the fourth embodiment, respectively. . Therefore, here, Step S807, which is a difference between the example of the communication control process according to the third embodiment described with reference to FIG. 21 and the example of the communication control process according to the fourth embodiment, Only S811 and S813 will be described.
- step S807 the resource control unit 177 is notified of the link direction (that is, the TDD configuration) in the macro cell 30 by the eNodeB 31 of the macro cell 30.
- step S811 the resource control unit 177 does not locate communication resources in subframes in which the link direction in the cell 10 and the link direction in the macro cell 30 are different from each other at the end of the cell 10 (that is, in the center of the cell 10). Assign to UE 200 (located).
- step S813 the resource control unit 177 allocates communication resources in subframes in which the link direction in the cell 10 and the link direction in the macro cell 30 are the same to the UE 200 located in the cell 10.
- allocation of communication resources to the UE 200 is controlled based on the setting of the link direction of the channel that can dynamically set the link direction for each subframe and the position of the UE 200 in the cell 10. .
- the link direction for each subframe in the first frequency band is dynamically set, and the link direction for each subframe in the second frequency band is set.
- the difference in the link direction between the cell 10 and the related cell (adjacent cell or macro cell) related to the cell 10 is set to be small.
- the communication resource of the said 1st frequency band is not allocated to UE200 located in the edge part of the cell 10.
- the communication resource of the frequency band in which the link direction is dynamically set by such TDD configuration setting and communication resource assignment is assigned only to the UE 200 located in the center of the cell 10. Therefore, the transmission power of the communication resource can be reduced. As a result, the uplink signal on the communication resource hardly interferes with the downlink signal of the related cell, and the downlink signal on the communication resource hardly interferes with the uplink signal of the related cell. That is, in the frequency band in which the link direction is dynamically set, interference as shown in FIGS. 4 to 6 hardly occurs. Note that only communication resources in a frequency band with a small difference in link direction with the related cell are allocated to the UE 200 located at the end of the cell 10, so that of course, the frequency band is shown in FIG. 4 to FIG. Such interference hardly occurs. Therefore, in a radio communication system that employs TDD, it is possible to suppress interference between adjacent cells while improving throughput by dynamically setting a link direction.
- the subframes in which the link direction in the cell 10 and the link direction in the related cell (adjacent cell or macro cell) related to the cell 10 are different.
- the communication resource in is not allocated to the UE 200 located at the end of the cell 10.
- the communication resource is allocated only to the UE 200 located in the center of the cell 10. Therefore, in the cell 10, the transmission power in the subframe can be reduced.
- the uplink signal of the cell 10 hardly interferes with the downlink signal of the related cell
- the downlink signal of the cell 10 hardly interferes with the uplink signal of the related cell. That is, even in a subframe in which the link direction is different between the cell 10 and the related cell, interference as shown in FIGS. 4 to 6 hardly occurs.
- the presupposed wireless communication system is a wireless communication system compliant with LTE or LTE-Advanced, but the present technology is not limited to such an example.
- the presupposed wireless communication system may be a wireless communication system similar to LTE or LTE-Advanced, or a wireless communication system compliant with a standard further developed from LTE or LTE-Advanced.
- the communication control device that performs cell communication control is an LTE or LTE-Advanced eNodeB, but the present technology is not limited to this example.
- the communication control device may be a base station that complies with another communication standard, or may be a device that constitutes a part of the base station.
- the communication control device may be another device that controls the base station.
- the terminal device that communicates in the cell is an LTE or LTE-Advanced UE, but the present technology is not limited to this example.
- the terminal device may be a terminal device that complies with another communication standard.
- a wireless communication unit that communicates with one or more terminal devices in a cell on a channel capable of dynamically setting a link direction for each subframe, which is a unit of time in wireless communication;
- a control unit that controls allocation of communication resources to the terminal device based on the setting of the link direction of the channel and the position of the terminal device in the cell;
- a communication control device comprising: (2) The channel includes at least a first frequency band and a second frequency band; The communication control apparatus dynamically sets a link direction for each subframe of the first frequency band, and sets a link direction for each subframe of the second frequency band to be related to the cell and the cell.
- a setting unit configured to set so that a difference in link direction with the cell is reduced, The control unit does not allocate communication resources of the first frequency band to a terminal device located at an end of the cell; The communication control device according to (1).
- the communication control device according to (2) wherein the related cell is an adjacent cell adjacent to the cell.
- the cell is a macro cell that overlaps a part or the whole of a small cell,
- the setting unit causes the communication node of the small cell to set the link direction for each subframe in the small cell so that the difference in link direction between the cell and the small cell is reduced.
- the communication control device according to (3).
- the setting unit determines the link direction of the second frequency band in the small cell, and the difference in the link direction between the cell and the small cell.
- the small cell communication node is set so that the The communication control device according to (4).
- the communication node dynamically sets a link direction for each subframe in a frequency band different from the second frequency band when the small cell is located at an end of the cell, and the small cell The communication control device according to (5), wherein a communication resource of the different frequency band is not allocated to a terminal device located at an end of the communication device.
- the setting unit determines a link direction of the first frequency band in the small cell when the small cell is not located at an end of the cell, and a difference in a link direction between the cell and the small cell.
- the communication control device according to any one of (4) to (6), wherein the communication node of the small cell is set so that the number of the small cell communication nodes decreases.
- the communication node dynamically sets a link direction for each subframe in a frequency band different from the first frequency band when the small cell is not located at an end of the cell, and the small cell
- the communication control device according to (7), wherein a communication resource in the different frequency band is not allocated to a terminal device located at an end of the communication device.
- the setting unit notifies the communication node of a link direction for each subframe of the first frequency band or a link direction for each subframe of the second frequency band set by the setting unit,
- the communication control apparatus according to any one of (4) to (8), wherein the communication node is configured to set a link direction for each subframe in a small cell.
- the control unit according to any one of (4) to (9), wherein the control unit decreases transmission power in the cell in a subframe in which a link direction in the cell and a link direction in the small cell are different.
- Communication control device (11)
- the cell is a small cell;
- the related cell is a macro cell that overlaps a part or the whole of the cell.
- the communication control device according to (2).
- a communication resource of a frequency band according to the position of the terminal device is allocated to the terminal device
- the second frequency band is a frequency band assigned to a terminal device located at an end of the related cell when the cell is located at an end of the related cell, and the cell is an end of the related cell.
- the communication control device according to (11). (13) The control unit reduces transmission power in the related cell in a subframe in which a link direction of the second frequency band in the cell is different from a link direction of the second frequency band in the related cell.
- the communication control device according to (11) or (12) which requests the communication node of the related cell.
- the communication control apparatus according to any one of (2) to (13), wherein the setting unit sets the link direction for each subframe of the second frequency band statically or semi-statically.
- each of the first frequency band and the second frequency band is a component carrier.
- the control unit does not allocate communication resources in a subframe in which a link direction in the cell and a link direction in a related cell related to the cell are different to a terminal apparatus located at an end of the cell, (1 ) Communication control device.
- the communication control device according to (16), wherein the related cell is an adjacent cell adjacent to the cell.
- the cell is a small cell;
- the related cell is a macro cell that overlaps a part or the whole of the cell.
- the communication control device according to (16) above. (19) Communicating with one or more terminal devices in a cell on a channel in which a link direction for each subframe, which is a unit of time in wireless communication, can be dynamically set; Controlling the allocation of communication resources to the terminal device based on the setting of the link direction of the channel and the position of the terminal device in the cell; Including a communication control method. (20) A wireless communication unit that communicates with a base station in a cell on a channel that can dynamically set a link direction for each subframe, which is a unit of time in wireless communication, The wireless communication unit communicates with the base station according to allocation of communication resources to the base station by the base station based on the setting of the link direction of the channel and the position of the base station within the cell. Terminal device.
- eNodeB 10 cells 11, 31, 41 eNodeB 13, 33, 43 Downlink signal 23, 25, 27 Uplink signal 21 UE 30 Macrocell 40 Small cell 100 eNodeB 110 wireless communication unit 120 network communication unit 130 storage unit 140, 150, 160, 170 processing unit 141 terminal position measurement unit 143 traffic volume measurement unit 145, 155, 165 link direction setting unit 147, 167, 177 resource control unit 149, 159 , 179, 179 Power control unit 200
- UE User equipment
- UE wireless communication unit 220 storage unit 230 processing unit
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Abstract
Description
1.はじめに
1.1.TDDに関する一般論
1.2.TDDに関する技術的課題
2.第1の実施形態
2.1.概略
2.2.eNodeBの構成
2.3.UEの構成
2.4.処理の流れ
2.5.変形例
3.第2の実施形態
3.1.概略
3.2.eNodeBの構成
3.3.処理の流れ
4.第3の実施形態
4.1.概略
4.2.eNodeBの構成
4.3.処理の流れ
5.第4の実施形態
5.1.概略
5.2.eNodeBの構成
5.3.処理の流れ
6.まとめ
まず、TDDに関する一般論及びTDDに関する技術的課題を説明する。なお、本明細書では、LTE又はLTE-Advancedに準拠した無線通信システムを例として用いて、上記一般論、技術的課題、及び各実施形態を説明するが、当然のことながら、本開示は当該例に限定されない。
図1~3を参照して、TDDに関する一般論を説明する。
LTEでは、FDD又はTDDのいずれも採用可能である。FDDでは、周波数方向において、アップリンク専用の周波数帯域とダウンリンク専用の周波数帯域とが使用される。また、FDDでは、時間方向において、10個のサブフレームを含む無線フレームのフォーマットが使用される。一方、TDDでも、時間方向において、10個のサブフレームを含む無線フレームのフォーマットが使用される。しかし、TDDでは、アップリンク及びダウンリンクの両方の通信に同一の周波数帯域が使用される。以下、TDDの無線フレームのフォーマットを図1を参照してより具体的に説明する。
LTE TDDは、3GPPのリリース8で定義された。TS 36.211 Table 4.2-2:Uplink-Downlink configurationsでは、TDDの無線フレームにおけるサブフレームごとのリンク方向のコンフィギュレーション(即ち、TDDコンフィギュレーション)が示されている。以下、当該TDDコンフィギュレーションを、図3を参照してより具体的に説明する。
次に、図4~6を参照して、TDDに関する技術的課題を説明する。
3GPPの2011年3月にカンザスシティで開かれたPlenary Meetingにおいて、隣接するセル間で別々のTDDコンフィギュレーションを設定することにより干渉の問題を研究していくことが決定された。これにより、世の中の流れとして、LTE TDDは、関連するセル(例えば、隣接するセル)間で別々のTDDコンフィギュレーションを設定するという方向に動き出したといえる。以下、関連するセル間(例えば、隣接するセル間、マクロセルとスモールセルとの間)で別々のTDDコンフィギュレーションを設定する場合に発生する具体的な干渉を、図4~6を参照してより具体的に説明する。
以上のように、関連するセル間で別々TDDコンフィギュレーションが設定されることで当該関連するセル間での干渉が発生し得る一方、TDDコンフィギュレーションをセルごとに動的に設定することが求められている。これは、各セル内でのアップリンク又はダウンリンクのトラフィック量に合わせて適当なTDDコンフィギュレーションを選択することにより、スループットの向上が見込めるからである。即ち、セル内でアップリンクのトラフィック量が増加した場合には、当該トラフィック量の増加に応じてより多くのアップリンクサブフレームを含むTDDコンフィギュレーションが選択されるべきである。また、セル内でダウンリンクのトラフィック量が増加した場合には、当該トラフィック量の増加に応じてより多くのダウンリンクサブフレームを含むTDDコンフィギュレーションが選択されるべきである。当該トラフィック量の特性はセルごとに異なるので、セルごとにTDDコンフィギュレーションを独立に動的に設定することが望ましい。例えば、無線フレームの長さが10msなので、10ms~数10msごとにTDDコンフィギュレーションを設定することが考えられる。
上述したように、関連するセル間で別々のTDDコンフィギュレーションを設定することで干渉が発生し得る一方、スループットの向上のためにリンク方向のTDDコンフィギュレーションを動的に設定することが求められる。しかし、各セルにおいてTDDコンフィギュレーションを動的に(例えば、数10msごとに)設定するような場合には、セル間で上記干渉を制御することは非常に難しい。
<2.1.概略>
まず、本開示の第1の実施形態を説明する。第1の実施形態では、第1の周波数帯域のサブフレームごとのリンク方向が動的に設定され、第2の周波数帯域のサブフレームごとのリンク方向が、隣接するセル間のリンク方向の相違が少なくなるように、即ち、リンク方向がなるべく共通になるように設定される。そして、セルの端部に位置する端末装置には、第1の周波数帯域の通信リソースが割り当てられない。以下、このような第1の実施形態の概略を、図7を参照してより具体的に説明する。
図8を参照して、第1の実施形態に係るeNodeB100-1の構成の一例について説明する。図8は、第1の実施形態に係るeNodeB100-1の構成の一例を示すブロック図である。図8を参照すると、eNodeB100-1は、無線通信部110、ネットワーク通信部120、記憶部130及び処理部140を備える。
無線通信部110は、無線通信における時間の単位であるサブフレームごとのリンク方向を動的に設定可能なチャネル上で、セル10内の1つ以上のUE200と通信する。上記チャネルは、例えば、少なくとも第1の周波数帯域及び第2の周波数帯域を含む。また、上記第1の周波数帯域及び上記第2の周波数帯域の各々は、コンポーネントキャリアである。即ち、無線通信部110は、サブフレームごとのリンク方向を動的に設定可能であるCC1及びCC2上で、セル10内のUE200と通信する。また、無線通信部110は、リソースの割当てに従って、セル10内のUE200へのダウンリンク信号を送信し、セル10内のUE200からのアップリンク信号を受信する。なお、無線通信部110は、例えばアンテナ及びRF回路を含む。
ネットワーク通信部120は、他のeNodeBを含む通信ノードと通信する。例えば、eNodeB間のX2インターフェースは、ネットワーク通信部120を介して実現され得る。ネットワーク通信部120は、無線通信部110と共通化され得る無線通信モジュールを含んでもよく、又はLAN接続端子等の有線通信モジュールを含んでもよい。
記憶部130は、eNodeB100-1の動作のためのプログラム及びデータを記憶する。記憶部130は、例えばハードディスク又は半導体メモリ等の記憶媒体を含む。
処理部140は、eNodeB100-1の様々な機能を提供する。例えば、処理部140は、CPU(Central Processing Unit)又はDSP(Digital Signal Processor)等のプロセッサに相当し、記憶部130又は他の記憶媒体に記憶されるプログラムを実行することにより、上記様々な機能を提供する。処理部140は、端末位置測定部141、トラフィック量測定部143、リンク方向設定部145、リソース制御部147及び電力制御部149を含む。
端末位置測定部141は、セル10内のUE200の位置を測定する。当該位置は、例えばeNodeB100-1とUE200との間の距離により示される。例えば、端末位置測定部141は、各UE200のためのタイミングアドバンス値から、eNodeB100-1とUE200との間の距離を測定する。
トラフィック量測定部143は、セル10内のアップリンクのトラフィック量及びダウンリンクのトラフィック量を測定する。トラフィック量測定部143は、所定の期間内のトラフィック量の実績値を測定してもよく、又は、UE200からのスケジューリング要求等に基づいて、所定の期間に予測されるトラフィック量の推定値を測定してもよい。また、トラフィック量測定部143は、セル10の端部でのトラフィック量とセル10の中心部でのトラフィック量とを別々に測定してもよく、又は、両方のトラフィック量を区別せずに一括で測定してもよい。
リンク方向設定部145は、上記第1の周波数帯域のサブフレームごとのリンク方向を動的に設定し、上記第2の周波数帯域のサブフレームごとのリンク方向を、セル10と当該セル10に関連する関連セルとの間のリンク方向の相違が少なくなるように設定する。本実施形態では、上記関連セルは、セル10に隣接する隣接セルである。例えば、リンク方向設定部145は、アップリンク又はダウンリンクのトラフィック量に応じて、CC1のTDDコンフィギュレーションを動的に設定する。一例として、CC1のTDDコンフィギュレーションは、10ms~数10msごとに設定される。また、リンク方向設定部145は、CC2のTDDコンフィギュレーションを、隣接セルのCC2のTDDコンフィギュレーションと同一又は類似のTDDコンフィギュレーションに設定する。一例として、リンク方向設定部145は、ネットワーク通信部120を介して、測定されたトラフィック量に基づいてCC2のリンク方向の設定について隣接セルのeNodeB100-1と交渉する。セル10のeNodeB100-1と隣接セルのeNodeB100-1との間のインターフェースは、X2インターフェースである。
リソース制御部147は、サブフレームごとのリンク方向を動的に設定可能な上記チャネルのリンク方向の設定とセル10内のUE200の位置とに基づいて、UE200への通信リソースの割当てを制御する。とりわけ、本実施形態では、リソース制御部147は、セル10の端部に位置するUE200に上記第1の周波数帯域の通信リソースを割り当てない。例えば、リソース制御部147は、セル10の端部に位置するUE200にCC1の通信リソースを割り当てず、セル10の端部に位置しないUE200(即ち、セル10の中心部に位置するUE200)にCC1の通信リソースを割り当てる。また、例えば、リソース制御部147は、セル10の端部(及びセル10の中心部)に位置するUE200に、CC2の通信リソースを割り当てる。
電力制御部149は、セル10における送信電力を制御する。例えば、電力制御部149は、無線通信部110による送信電力を制御する。例えば、電力制御部149は、上記第1の周波数帯域(例えば、CC1)でのダウンリンクに小さい送信電力を割り当て、上記第2の周波数帯域(例えば、CC2)でのダウンリンクに大きい送信電力を割り当てる。
図9を参照して、第1の実施形態に係るUE200の構成の一例について説明する。図9は、第1の実施形態に係るUE200の構成の一例を示すブロック図である。図9を参照すると、UE200は、無線通信部210、記憶部220及び処理部230を備える。
無線通信部210は、無線通信における時間の単位であるサブフレームごとのリンク方向を動的に設定可能なチャネル上で、セル10内のeNodeB100-1と通信する。また、無線通信部210は、上記チャネルのリンク方向の設定とセル10内の自装置の位置とに基づくeNodeB100-1による自装置への通信リソースの割当てに従って、eNodeB100-1と通信する。
記憶部220は、UE200の動作のためのプログラム及びデータを記憶する。記憶部220は、例えばハードディスク又は半導体メモリ等の記憶媒体を含む。
処理部230は、UE200の様々な機能を提供する。例えば、処理部230は、CPU(Central Processing Unit)又はDSP(Digital Signal Processor)等のプロセッサに相当し、記憶部220又は他の記憶媒体に記憶されるプログラムを実行することにより、上記様々な機能を提供する。一例として、処理部230は、無線通信部210の通信を制御する。
次に、図10を参照して、第1の実施形態に係る通信制御処理の一例について説明する。図10は、第1の実施形態に係る通信制御処理の概略的な流れの一例を示すフローチャートである。なお、当該通信制御処理は、eNodeB100-1における処理である。
(1)概略
次に、第1の実施形態の変形例を説明する。本変形例では、セル10は、スモールセルの一部又は全体と重複するマクロセルである。そして、eNodeB100-1は、上記スモールセルでのサブフレームごとのリンク方向を、セル10と上記スモールセルとの間のリンク方向の相違が少なくなるように上記スモールセルの通信ノード(例えば、eNodeB)に設定させる。以下、このような第1の実施形態の変形例の概略を、図11を参照してより具体的に説明する。
なお、スモールセル40も、セル10と同様に、eNodeB41から遠い端部と、端部以外の中心部(即ち、eNodeB41に近い中心部)とに分けられてもよい。以下、この点について図12を参照してより具体的に説明する。
本変形例では、図8を参照して説明されたeNodeB100-1のリンク方向設定部145及び電力制御部149は、さらに、以下のように動作する。なお、上述したとおり、本変形例では、セル10は、スモールセル40の一部又は全体と重複するマクロセルである。
リンク方向設定部145は、スモールセル40でのサブフレームごとのリンク方向を、セル10とスモールセル40との間のリンク方向の相違が少なくなるようにスモールセル40のeNodeB41に設定させる。即ち、リンク方向設定部145は、eNodeB41に、スモールセル40のTDDコンフィギュレーションを、セル10のTDDコンフィギュレーションと同一の又は類似するTDDコンフィギュレーションに設定させる。
電力制御部149は、セル10でのリンク方向とスモールセル40でのリンク方向とが異なるサブフレームにおいてセル10での送信電力を減少させてもよい。例えば、電力制御部149は、セル10でのCC2のリンク方向とスモールセル40aでのCC2でのリンク方向とが異なるサブフレームにおいて、セル10でのCC2の送信電力を減少させる。また、例えば、電力制御部149は、セル10でのCC1のリンク方向とスモールセル40bでのCC1でのリンク方向とが異なるサブフレームにおいて、セル10でのCC1の送信電力を減少させる。この場合に、例えば、電力制御部149は、ネットワーク通信部120を介して、スモールセル40でのリンク方向(即ち、TDDコンフィギュレーション)をeNodeB41により通知される。
なお、スモールセル40において通信に使用可能なサブフレームの数に制限がある場合には、スモールセル40内でのダウンリンク又はアップリンクのトラフィック量に合わせて、通信に使用するサブフレームが選択されてもよい。即ち、ダウンリンク又はアップリンクのトラフィック量に合わせて、無線フレームにおけるアップリンクサブフレームとダウンリンクサブフレームとの比率が変更されてもよい。以下、この点について図13を参照してより具体的に説明する。
次に、図14を参照して、第1の実施形態の変形例に係る通信制御処理の一例について説明する。図14は、第1の実施形態の変形例に係る通信制御処理の概略的な流れの一例を示すフローチャートである。当該通信制御処理は、eNodeB100-1における処理である。ここでは、図10を参照して説明された第1の実施形態に係る通信制御処理の一例と、当該変形例に係る通信制御処理の一例との差分である、ステップS521のみを説明する。
<3.1.概略>
上述した第1の実施形態では、別のセルに隣接するセルのeNodeBの動作に着目した。さらに、当該第1の実施形態の変形例では、別のセルに隣接する上記セルがマクロセルである場合における、当該マクロセルのeNodeBの動作に着目した。次に説明する本開示の第2実施形態では、マクロセルと一部又は全体で重複するスモールセルのeNodeBの動作に着目する。当該第2の実施形態では、スモールセルにおいて、第1の周波数帯域のサブフレームごとのリンク方向が動的に設定され、第2の周波数帯域のサブフレームごとのリンク方向が、スモールセルとマクロセルとの間のリンク方向の相違が少なくなるように、即ち、リンク方向がなるべく共通になるように設定される。そして、スモールセルの端部に位置する端末装置には、第1の周波数帯域の通信リソースが割り当てられない。以下、このような第2の実施形態の概略を、図15及び図16を参照してより具体的に説明する。
図17を参照して、第2の実施形態に係るeNodeB100-2の構成の一例について説明する。図17は、第2の実施形態に係るeNodeB100-2の構成の一例を示すブロック図である。図17を参照すると、eNodeB100-2は、無線通信部110、ネットワーク通信部120、記憶部130及び処理部150を備える。
リンク方向設定部155は、上記第1の周波数帯域のサブフレームごとのリンク方向を動的に設定し、上記第2の周波数帯域のサブフレームごとのリンク方向を、セル10と当該セル10に関連する関連セルとの間のリンク方向の相違が少なくなるように設定する。本実施形態では、セル10は、スモールセルであり、上記関連セルは、セル10の一部又は全体と重複するマクロセル30である。例えば、リンク方向設定部155は、アップリンク又はダウンリンクのトラフィック量に応じて、CC1のTDDコンフィギュレーションを動的に設定する。一例として、CC1のTDDコンフィギュレーションは、10ms~数10msごとに設定される。また、リンク方向設定部155は、CC2のTDDコンフィギュレーションを、マクロセル30のCC2のTDDコンフィギュレーションと同一の又は類似するTDDコンフィギュレーションに設定する。一例として、リンク方向設定部155は、ネットワーク通信部120を介して、マクロセル30のCC2のTDDコンフィギュレーションをeNodeB31により通知される。
電力制御部159は、セル10における送信電力を制御する。例えば、電力制御部159は、無線通信部110による送信電力を制御する。例えば、電力制御部159は、上記第1の周波数帯域(例えば、CC1)でのダウンリンクに小さい送信電力を割り当て、上記第2の周波数帯域(例えば、CC2)でのダウンリンクに大きい送信電力を割り当てる。
次に、図18を参照して、第2の実施形態に係る通信制御処理の一例について説明する。図18は、第2の実施形態に係る通信制御処理の概略的な流れの一例を示すフローチャートである。当該通信制御処理は、eNodeB100-2における処理である。図10を参照して説明された第1の実施形態に係る通信制御処理のステップS501~S505、S511~S517は、それぞれ、第2の実施形態に係る通信制御処理のステップS601~S605、S611~S617に対応する。よって、ここでは、図10を参照して説明された第1の実施形態に係る通信制御処理の一例と、当該第2の実施形態に係る通信制御処理の一例との差分である、ステップS607のみを説明する。
<4.1.概略>
次に、本開示の第3実施形態を説明する。第3の実施形態では、セルでのリンク方向と当該セルに隣接する隣接セルでのリンク方向とが異なるサブフレームにおける通信リソースは、上記セルの端部に位置する端末装置に割り当てられない。以下、このような第3の実施形態の概略を、図19を参照してより具体的に説明する。
図20を参照して、第3の実施形態に係るeNodeB100-3の構成の一例について説明する。図20は、第3の実施形態に係るeNodeB100-3の構成の一例を示すブロック図である。図20を参照すると、eNodeB100-3は、無線通信部110、ネットワーク通信部120、記憶部130及び処理部160を備える。
リンク方向設定部165は、1つ以上の周波数帯域のサブフレームごとのリンク方向を動的に設定する。例えば、上記1つ以上の周波数帯域は、CC1及びCC2を含む。そして、リンク方向設定部165は、アップリンク又はダウンリンクのトラフィック量に応じて、CC1及びCC2に、図3に示されるTDDコンフィギュレーションのうちのいずれかを動的に設定する。一例として、TDDコンフィギュレーションは、10ms~数10msごとに設定される。CC1及びCC2には、同一のTDDコンフィギュレーションが設定されてもよく、又は別々のTDDコンフィギュレーションが設定されてもよい。
リソース制御部167は、サブフレームごとのリンク方向を動的に設定可能なチャネルのリンク方向の設定とセル10内のUE200の位置とに基づいて、UE200への通信リソースの割当てを制御する。とりわけ、本実施形態では、リソース制御部167は、セル10でのリンク方向と当該セル10に関連する関連セルでのリンク方向とが異なるサブフレームにおける通信リソースを、セル10の端部に位置するUE200に割り当てない。当該関連セルは、セル10に隣接する隣接セルである。例えば、セル10と隣接セルとの間でリンク方向が異なるサブフレームが、♯9のサブフレームである場合に、リソース制御部167は、♯9のサブフレームにおける通信リソースを、セル10の端部に位置するUE200に割り当てない。即ち、リソース制御部167は、♯9のサブフレームにおける通信リソースを、セル10の中心部に位置するUE200のみに割り当てる。また、リソース制御部167は、♯0~8のサブフレームにおける通信リソースを、セル10の端部に位置するUE200及びセル10の中心部に位置するUE200に割り当てる。
電力制御部169は、セル10における送信電力を制御する。例えば、電力制御部169は、セル10でのリンク方向と当該セル10に隣接する隣接セルでのリンク方向とが異なるサブフレームにおいて、セル10内の送信電力を小さくする。より具体的には、電力制御部169は、ダウンリンクに小さい送信電力を割り当てる。また、電力制御部169は、セル10の中心部に位置するUE200に、アップリンクに小さい送信電力を割り当てさせる。
次に、図21を参照して、第3の実施形態に係る通信制御処理の一例について説明する。図21は、第3の実施形態に係る通信制御処理の概略的な流れの一例を示すフローチャートである。なお、当該通信制御処理は、eNodeB100-3における処理である。
<5.1.概略>
上述した第3の実施形態では、別のセルに隣接するセルのeNodeBの動作に着目した。次に説明する本開示の第4実施形態では、マクロセルに一部又は全体で重複するスモールセルのeNodeBの動作に着目する。当該第4の実施形態では、スモールセルでのリンク方向と当該スモールセルの一部又は全体と重複するマクロセルのリンク方向とが異なるサブフレームにおける通信リソースは、上記スモールセルにおいて、当該モールセルの端部に位置する端末装置に割り当てられない。以下、このような第4の実施形態の概略を、図22を参照してより具体的に説明する。
図23を参照して、第4の実施形態に係るeNodeB100-4の構成の一例について説明する。図23は、第4の実施形態に係るeNodeB100-4の構成の一例を示すブロック図である。図23を参照すると、eNodeB100-4は、無線通信部110、ネットワーク通信部120、記憶部130及び処理部170を備える。
リソース制御部177は、サブフレームごとのリンク方向を動的に設定可能なチャネルのリンク方向の設定とセル10内のUE200の位置とに基づいて、UE200への通信リソースの割当てを制御する。とりわけ、本実施形態では、リソース制御部177は、セル10でのリンク方向と当該セル10に関連する関連セルでのリンク方向とが異なるサブフレームにおける通信リソースを、セル10の端部に位置するUE200に割り当てない。ここでは、セル10は、スモールセルであり、上記関連セルは、セル10の一部又は全体と重複するマクロセルである。例えば、セル10とマクロセル30との間でリンク方向が異なるサブフレームが、♯9のサブフレームである場合に、リソース制御部177は、♯9のサブフレームにおける通信リソースを、セル10の端部に位置するUE200に割り当てない。即ち、リソース制御部177は、♯9のサブフレームにおける通信リソースを、セル10の中心部に位置するUE200のみに割り当てる。また、リソース制御部167は、♯0~8のサブフレームにおける通信リソースを、セル10の端部に位置するUE200及びセル10の中心部に位置するUE200に割り当てる。
電力制御部179は、セル10における送信電力を制御する。例えば、電力制御部179は、セル10でのリンク方向とマクロセル30でのリンク方向とが異なるサブフレームにおいて、セル10内の送信電力を小さくする。より具体的には、電力制御部179は、ダウンリンクに小さい送信電力を割り当てる。また、電力制御部179は、セル10の中心部に位置するUE200に、アップリンクに小さい送信電力を割り当てさせる。
次に、図24を参照して、第4の実施形態に係る通信制御処理の一例について説明する。図24は、第4の実施形態に係る通信制御処理の概略的な流れの一例を示すフローチャートである。なお、当該通信制御処理は、eNodeB100-4における処理である。図21を参照して説明された第3の実施形態に係る通信制御処理のステップS701~S705、S715は、それぞれ、第4の実施形態に係る通信制御処理のステップS801~S805、S815に対応する。よって、ここでは、図21を参照して説明された第3の実施形態に係る通信制御処理の一例と、当該第4の実施形態に係る通信制御処理の一例との差分である、ステップS807、S811、S813のみを説明する。
ここまで、図1~図24を用いて、本開示の実施形態に係るeNodeB100について説明した。本実施形態によれば、サブフレームごとのリンク方向を動的に設定可能なチャネルのリンク方向の設定とセル10内のUE200の位置とに基づいて、UE200への通信リソースの割当てが制御される。
(1)
無線通信における時間の単位であるサブフレームごとのリンク方向を動的に設定可能なチャネル上で、セル内の1つ以上の端末装置と通信する無線通信部と、
前記チャネルのリンク方向の設定と前記セル内の端末装置の位置とに基づいて、前記端末装置への通信リソースの割当てを制御する制御部と、
を備える通信制御装置。
(2)
前記チャネルは、少なくとも第1の周波数帯域及び第2の周波数帯域を含み、
前記通信制御装置は、前記第1の周波数帯域のサブフレームごとのリンク方向を動的に設定し、前記第2の周波数帯域のサブフレームごとのリンク方向を、前記セルと当該セルに関連する関連セルとの間のリンク方向の相違が少なくなるように設定する設定部、をさらに備え、
前記制御部は、前記セルの端部に位置する端末装置に前記第1の周波数帯域の通信リソースを割り当てない、
前記(1)に記載の通信制御装置。
(3)
前記関連セルは、前記セルに隣接する隣接セルである、前記(2)に記載の通信制御装置。
(4)
前記セルは、スモールセルの一部又は全体と重複するマクロセルであり、
前記設定部は、前記スモールセルでのサブフレームごとのリンク方向を、前記セルと前記スモールセルとの間のリンク方向の相違が少なくなるように前記スモールセルの通信ノードに設定させる、
前記(3)に記載の通信制御装置。
(5)
前記設定部は、前記スモールセルが前記セルの端部に位置する場合に、前記スモールセルでの前記第2の周波数帯域のリンク方向を、前記セルと前記スモールセルとの間のリンク方向の相違が少なくなるように前記スモールセルの通信ノードに設定させる、
前記(4)に記載の通信制御装置。
(6)
前記通信ノードは、前記スモールセルが前記セルの端部に位置する場合に、前記第2の周波数帯域とは別の周波数帯域のサブフレームごとのリンク方向を動的に設定し、且つ前記スモールセルの端部に位置する端末装置に当該別の周波数帯域の通信リソースを割り当てない、前記(5)に記載の通信制御装置。
(7)
前記設定部は、前記スモールセルが前記セルの端部に位置しない場合に、前記スモールセルでの前記第1の周波数帯域のリンク方向を、前記セルと前記スモールセルとの間のリンク方向の相違が少なくなるように前記スモールセルの通信ノードに設定させる、前記(4)~(6)のいずれか1項に記載の通信制御装置。
(8)
前記通信ノードは、前記スモールセルが前記セルの端部に位置しない場合に、前記第1の周波数帯域とは別の周波数帯域のサブフレームごとのリンク方向を動的に設定し、且つ前記スモールセルの端部に位置する端末装置に当該別の周波数帯域の通信リソースを割り当てない、前記(7)に記載の通信制御装置。
(9)
前記設定部は、当該設定部により設定される前記第1の周波数帯域のサブフレームごとのリンク方向又は前記第2の周波数帯域のサブフレームごとのリンク方向を前記通信ノードに通知することにより、前記スモールセルでのサブフレームごとのリンク方向を前記通信ノードに設定させる、前記(4)~(8)のいずれか1項に記載の通信制御装置。
(10)
前記制御部は、前記セルでのリンク方向と前記スモールセルでのリンク方向とが異なるサブフレームにおいて前記セルでの送信電力を減少させる、前記(4)~(9)のいずれか1項に記載の通信制御装置。
(11)
前記セルは、スモールセルであり、
前記関連セルは、前記セルの一部又は全体と重複するマクロセルである、
前記(2)に記載の通信制御装置。
(12)
前記関連セルでは、端末装置の位置に応じた周波数帯域の通信リソースが当該端末装置に割り当てられ、
前記第2の周波数帯域は、前記セルが前記関連セルの端部に位置する場合に、前記関連セルの端部に位置する端末装置に割り当てられる周波数帯域であり、前記セルが前記関連セルの端部に位置しない場合に、前記関連セルの端部に位置しない端末装置に割り当てられる周波数帯域である、
前記(11)に記載の通信制御装置。
(13)
前記制御部は、前記セルでの前記第2の周波数帯域のリンク方向と前記関連セルでの前記第2の周波数帯域のリンク方向とが異なるサブフレームにおいて前記関連セルでの送信電力を減少させるように、前記関連セルの通信ノードに要求する、前記(11)又は(12)に記載の通信制御装置。
(14)
前記設定部は、前記第2の周波数帯域のサブフレームごとの前記リンク方向を静的又は準静的に設定する、前記(2)~(13)のいずれか1項に記載の通信制御装置。
(15)
前記第1の周波数帯域及び前記第2の周波数帯域の各々はコンポーネントキャリアである、前記(2)~(14)のいずれか1項に記載の通信制御装置。
(16)
前記制御部は、前記セルでのリンク方向と当該セルに関連する関連セルでのリンク方向とが異なるサブフレームにおける通信リソースを、前記セルの端部に位置する端末装置に割り当てない、前記(1)に記載の通信制御装置。
(17)
前記関連セルは、前記セルに隣接する隣接セルである、前記(16)に記載の通信制御装置。
(18)
前記セルは、スモールセルであり、
前記関連セルは、前記セルの一部又は全体と重複するマクロセルである、
前記(16)に記載の通信制御装置。
(19)
無線通信における時間の単位であるサブフレームごとのリンク方向を動的に設定可能なチャネル上で、セル内の1つ以上の端末装置と通信することと、
前記チャネルのリンク方向の設定と前記セル内の端末装置の位置とに基づいて、前記端末装置への通信リソースの割当てを制御することと、
を含む通信制御方法。
(20)
無線通信における時間の単位であるサブフレームごとのリンク方向を動的に設定可能なチャネル上で、セル内の基地局と通信する無線通信部
を備え、
前記無線通信部は、前記チャネルのリンク方向の設定と前記セル内の自装置の位置とに基づく前記基地局による自装置への通信リソースの割当てに従って、前記基地局と通信する、
端末装置。
11、31、41 eNodeB
13、33、43 ダウンリンク信号
23、25、27 アップリンク信号
21 UE
30 マクロセル
40 スモールセル
100 eNodeB
110 無線通信部
120 ネットワーク通信部
130 記憶部
140、150、160、170 処理部
141 端末位置測定部
143 トラフィック量測定部
145、155、165 リンク方向設定部
147、167、177 リソース制御部
149、159、169、179 電力制御部
200 ユーザ機器(UE)
210 無線通信部
220 記憶部
230 処理部
Claims (20)
- 無線通信における時間の単位であるサブフレームごとのリンク方向を動的に設定可能なチャネル上で、セル内の1つ以上の端末装置と通信する無線通信部と、
前記チャネルのリンク方向の設定と前記セル内の端末装置の位置とに基づいて、前記端末装置への通信リソースの割当てを制御する制御部と、
を備える通信制御装置。 - 前記チャネルは、少なくとも第1の周波数帯域及び第2の周波数帯域を含み、
前記通信制御装置は、前記第1の周波数帯域のサブフレームごとのリンク方向を動的に設定し、前記第2の周波数帯域のサブフレームごとのリンク方向を、前記セルと当該セルに関連する関連セルとの間のリンク方向の相違が少なくなるように設定する設定部、をさらに備え、
前記制御部は、前記セルの端部に位置する端末装置に前記第1の周波数帯域の通信リソースを割り当てない、
請求項1に記載の通信制御装置。 - 前記関連セルは、前記セルに隣接する隣接セルである、請求項2に記載の通信制御装置。
- 前記セルは、スモールセルの一部又は全体と重複するマクロセルであり、
前記設定部は、前記スモールセルでのサブフレームごとのリンク方向を、前記セルと前記スモールセルとの間のリンク方向の相違が少なくなるように前記スモールセルの通信ノードに設定させる、
請求項3に記載の通信制御装置。 - 前記設定部は、前記スモールセルが前記セルの端部に位置する場合に、前記スモールセルでの前記第2の周波数帯域のリンク方向を、前記セルと前記スモールセルとの間のリンク方向の相違が少なくなるように前記スモールセルの通信ノードに設定させる、
請求項4に記載の通信制御装置。 - 前記通信ノードは、前記スモールセルが前記セルの端部に位置する場合に、前記第2の周波数帯域とは別の周波数帯域のサブフレームごとのリンク方向を動的に設定し、且つ前記スモールセルの端部に位置する端末装置に当該別の周波数帯域の通信リソースを割り当てない、請求項5に記載の通信制御装置。
- 前記設定部は、前記スモールセルが前記セルの端部に位置しない場合に、前記スモールセルでの前記第1の周波数帯域のリンク方向を、前記セルと前記スモールセルとの間のリンク方向の相違が少なくなるように前記スモールセルの通信ノードに設定させる、請求項4に記載の通信制御装置。
- 前記通信ノードは、前記スモールセルが前記セルの端部に位置しない場合に、前記第1の周波数帯域とは別の周波数帯域のサブフレームごとのリンク方向を動的に設定し、且つ前記スモールセルの端部に位置する端末装置に当該別の周波数帯域の通信リソースを割り当てない、請求項7に記載の通信制御装置。
- 前記設定部は、当該設定部により設定される前記第1の周波数帯域のサブフレームごとのリンク方向又は前記第2の周波数帯域のサブフレームごとのリンク方向を前記通信ノードに通知することにより、前記スモールセルでのサブフレームごとのリンク方向を前記通信ノードに設定させる、請求項4に記載の通信制御装置。
- 前記制御部は、前記セルでのリンク方向と前記スモールセルでのリンク方向とが異なるサブフレームにおいて前記セルでの送信電力を減少させる、請求項4に記載の通信制御装置。
- 前記セルは、スモールセルであり、
前記関連セルは、前記セルの一部又は全体と重複するマクロセルである、
請求項2に記載の通信制御装置。 - 前記関連セルでは、端末装置の位置に応じた周波数帯域の通信リソースが当該端末装置に割り当てられ、
前記第2の周波数帯域は、前記セルが前記関連セルの端部に位置する場合に、前記関連セルの端部に位置する端末装置に割り当てられる周波数帯域であり、前記セルが前記関連セルの端部に位置しない場合に、前記関連セルの端部に位置しない端末装置に割り当てられる周波数帯域である、
請求項11に記載の通信制御装置。 - 前記制御部は、前記セルでの前記第2の周波数帯域のリンク方向と前記関連セルでの前記第2の周波数帯域のリンク方向とが異なるサブフレームにおいて前記関連セルでの送信電力を減少させるように、前記関連セルの通信ノードに要求する、請求項11に記載の通信制御装置。
- 前記設定部は、前記第2の周波数帯域のサブフレームごとの前記リンク方向を静的又は準静的に設定する、請求項2に記載の通信制御装置。
- 前記第1の周波数帯域及び前記第2の周波数帯域の各々はコンポーネントキャリアである、請求項2に記載の通信制御装置。
- 前記制御部は、前記セルでのリンク方向と当該セルに関連する関連セルでのリンク方向とが異なるサブフレームにおける通信リソースを、前記セルの端部に位置する端末装置に割り当てない、請求項1に記載の通信制御装置。
- 前記関連セルは、前記セルに隣接する隣接セルである、請求項16に記載の通信制御装置。
- 前記セルは、スモールセルであり、
前記関連セルは、前記セルの一部又は全体と重複するマクロセルである、
請求項16に記載の通信制御装置。 - 無線通信における時間の単位であるサブフレームごとのリンク方向を動的に設定可能なチャネル上で、セル内の1つ以上の端末装置と通信することと、
前記チャネルのリンク方向の設定と前記セル内の端末装置の位置とに基づいて、前記端末装置への通信リソースの割当てを制御することと、
を含む通信制御方法。 - 無線通信における時間の単位であるサブフレームごとのリンク方向を動的に設定可能なチャネル上で、セル内の基地局と通信する無線通信部
を備え、
前記無線通信部は、前記チャネルのリンク方向の設定と前記セル内の自装置の位置とに基づく前記基地局による自装置への通信リソースの割当てに従って、前記基地局と通信する、
端末装置。
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KR102141202B1 (ko) | 2018-03-23 | 2020-08-04 | 경북대학교 산학협력단 | 시분할 듀플렉싱 이동통신 시스템에서 교차슬럿을 활용한 간섭 절감 장치 및 방법 |
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CN104285488B (zh) | 2018-12-14 |
US10028259B2 (en) | 2018-07-17 |
RU2014144426A (ru) | 2016-05-27 |
EP2849518B1 (en) | 2019-12-18 |
EP2849518A1 (en) | 2015-03-18 |
AU2013259087A1 (en) | 2014-10-09 |
BR112014027460A2 (pt) | 2017-06-27 |
EP3621388A1 (en) | 2020-03-11 |
US9807738B2 (en) | 2017-10-31 |
JPWO2013168467A1 (ja) | 2016-01-07 |
IN2014DN09181A (ja) | 2015-07-10 |
US20170079023A1 (en) | 2017-03-16 |
JP2016034157A (ja) | 2016-03-10 |
CA2868100A1 (en) | 2013-11-14 |
US20150117348A1 (en) | 2015-04-30 |
US9480053B2 (en) | 2016-10-25 |
US20180049178A1 (en) | 2018-02-15 |
JP5979300B2 (ja) | 2016-08-24 |
CN104285488A (zh) | 2015-01-14 |
JP5979228B2 (ja) | 2016-08-24 |
AU2013259087B2 (en) | 2017-09-07 |
ZA201406795B (en) | 2015-03-25 |
EP2849518A4 (en) | 2016-01-06 |
MX2014013311A (es) | 2015-02-10 |
RU2640792C2 (ru) | 2018-01-12 |
MX337557B (es) | 2016-03-10 |
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