WO2011007388A1 - 無線通信システム、基地局装置、端末装置、中継局装置、及び無線通信システムにおける無線通信方法 - Google Patents
無線通信システム、基地局装置、端末装置、中継局装置、及び無線通信システムにおける無線通信方法 Download PDFInfo
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- WO2011007388A1 WO2011007388A1 PCT/JP2009/003324 JP2009003324W WO2011007388A1 WO 2011007388 A1 WO2011007388 A1 WO 2011007388A1 JP 2009003324 W JP2009003324 W JP 2009003324W WO 2011007388 A1 WO2011007388 A1 WO 2011007388A1
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- relay
- base station
- radio
- radio resource
- terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15557—Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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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
- H04W72/52—Allocation or scheduling criteria for wireless resources based on load
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- the present invention relates to a radio communication system, a base station apparatus, a terminal apparatus, a relay station apparatus, and a radio communication method in the radio communication system.
- base station a base station device
- terminal a terminal device
- relay station a relay station device
- Non-Patent Documents 1 and 2 In a wireless communication system using such a relay station, there are two relay systems, an AF (Amplified and Forward) system and a DF (Decode and Forward) system (for example, Non-Patent Documents 1 and 2 below).
- AF Anamplified and Forward
- DF Decode and Forward
- Centralized scheduling Centralized scheduling
- Distributed scheduling Distributed scheduling
- Non-Patent Documents 3 to 5 Non-Patent Documents 3 to 5 below.
- Centralized scheduling is a method in which, for example, a base station schedules a communication partner (relay station or terminal) of the base station and a communication partner (terminal) of the relay station.
- Distributed scheduling is a scheme in which, for example, the base station performs scheduling for the communication partner of the base station, and the relay station performs scheduling for the communication partner of the relay station.
- a radio frame is divided into an access area and a relay area.
- communication between a base station and a relay station uses an access area
- communication between a relay station and a terminal uses a relay area to perform radio communication.
- Non-Patent Document 6 is also disclosed.
- radio resources in the relay area are used in radio communication between the relay station and the terminal, if the number of terminals that perform radio communication with the relay station is less than a threshold value, there may be a surplus in the radio resources in the relay area. .
- an object of the present invention is to provide a radio communication system, a base station apparatus, a terminal apparatus, a relay station apparatus, and a radio communication method in the radio communication system that can effectively use radio resources.
- the base station apparatus allocates radio resources to the relay station apparatus and the terminal apparatus.
- a change unit that changes at least one of a method, a radio resource allocation method and a scheduling method, or a radio resource assignment method and a scheduling method and a relay method in the relay station device, and the change unit changes
- a transmission unit that transmits a change notification indicating that to the relay device, the relay device includes a reception unit that receives the change notification, the base station device, the relay station device, and the terminal device,
- the radio resource allocated or allocated by at least the changed radio resource allocation method It performs wireless communication by using a.
- FIG. 1 is a diagram illustrating a configuration example of a wireless communication system.
- FIG. 2 is a diagram illustrating a configuration example of the base station apparatus.
- FIG. 3 is a diagram illustrating a configuration example of the relay station apparatus.
- FIG. 4 is a diagram illustrating a configuration example of a terminal device.
- FIG. 5 is a sequence diagram showing an operation example.
- FIG. 6 is a sequence diagram illustrating an operation example.
- FIG. 7 is a flowchart showing an operation example.
- FIG. 8 is a sequence diagram showing an operation example.
- FIG. 9 is a flowchart showing an operation example.
- 10A and 10B are diagrams illustrating a configuration example of a radio frame.
- FIG. 11 is a diagram illustrating a configuration example of a radio frame.
- FIG. 11 is a diagram illustrating a configuration example of a radio frame.
- FIG. 12 is a sequence diagram showing an operation example.
- FIG. 13 is a flowchart showing an operation example.
- FIG. 14 is a sequence diagram illustrating an operation example.
- FIG. 15 is a flowchart showing an operation example.
- FIG. 16 is a diagram illustrating a configuration example of a base station apparatus.
- FIG. 17 is a diagram illustrating a configuration example of the relay station apparatus.
- FIG. 18 is a sequence diagram illustrating an operation example.
- FIG. 19 is a sequence diagram illustrating an operation example.
- FIG. 20 is a sequence diagram showing an operation example.
- FIG. 21 is a flowchart showing an operation example.
- FIG. 22 is a sequence diagram showing an operation example.
- FIG. 23 is a diagram illustrating a configuration example of a base station apparatus.
- FIG. 23 is a diagram illustrating a configuration example of a base station apparatus.
- FIG. 24 is a diagram illustrating a configuration example of the relay station apparatus.
- FIG. 25 is a sequence diagram illustrating an operation example.
- FIG. 26 is a sequence diagram illustrating an operation example.
- FIG. 27 is a sequence diagram illustrating an operation example.
- FIG. 28 is a sequence diagram illustrating an operation example.
- FIG. 1 is a diagram illustrating a configuration example of a wireless communication system 10 in the first embodiment.
- the radio communication system 10 includes a base station apparatus eNB (eNode B) 100, a relay station apparatus RN (Relay Node) 300, and a terminal apparatus UE (User Equipment) 500.
- eNB base station apparatus
- RN relay station apparatus
- UE User Equipment
- a base station apparatus (hereinafter “base station”) 100 performs wireless communication with a terminal apparatus (hereinafter “terminal”) 500-1 via a relay station apparatus (hereinafter “relay station”) 300, and further directly Wireless communication with terminal 500-2 is also possible.
- terminal terminal apparatus
- relay station relay station apparatus
- the wireless communication system 10 can perform wireless communication via the relay station 300, the service range can be expanded and insensitive area countermeasures can be taken.
- FIG. 2 is a diagram illustrating a configuration example of the base station 100.
- the base station 100 includes an antenna 101, a reception radio unit 102, a demodulation / decoding unit 103, a base station relay downlink radio channel quality information extraction unit (hereinafter referred to as “base station relay downlink quality extraction unit”) 104, Inter-relay terminal downlink radio channel quality information extraction unit (hereinafter, “relay terminal-to-relay terminal quality extraction unit”) 105 and base station relay-to-relay uplink radio channel quality information measurement calculation unit (hereinafter, “base station relay-to-relay uplink quality calculation unit”) ”) 106, relay radio terminal uplink radio channel quality information extraction unit (hereinafter“ relay terminal uplink quality extraction unit ”) 107, scheduler 110, and dynamic radio resource allocation control unit (hereinafter“ dynamic allocation control unit ”).
- base station relay downlink quality extraction unit Inter-relay terminal downlink radio channel quality information extraction unit
- base station relay-to-relay uplink quality calculation unit base station relay-
- dynamic allocation control signal creation unit 111
- dynamic allocation control signal creation unit 112
- partial radio resource Allocation control unit 112
- partial allocation control unit 113
- partial radio resource allocation control signal creation unit 112
- base station relay communication control signal creation unit 115
- Relay terminal communication control signal creation unit 116 radio resource allocation control method switching control unit (hereinafter referred to as "switching control unit") 120
- radio resource allocation control method switching control signal creation unit hereinafter referred to as "switching control signal”
- Creation section 121
- encoding / modulation section 122 encoding / modulation section 122
- transmission radio section 123 122
- the antenna 101 receives a radio signal transmitted from the relay station 300 or the terminal 500 subordinate to the base station 100, or transmits a radio signal to the relay station 300 or the like.
- the reception radio unit 102 outputs the radio signal output from the antenna 101 as a reception signal.
- the demodulation / decoding unit 103 demodulates and decodes the reception signal output from the reception radio unit 102 based on the scheduling determined by the scheduler 110.
- the base station relay downlink quality extraction unit 104 includes, in the received signal output from the demodulation / decoding unit 103, radio channel quality information in the downlink direction between the base station 100 and the relay station 300 (hereinafter referred to as “base station relay downlink relay”). Quality information ").
- Base station relay downlink quality extraction section 104 outputs the extracted base station relay downlink quality information to scheduler 110.
- Relay terminal downlink quality extraction section 105 includes, in the received signal output from demodulation / decoding section 103, radio channel quality information in the downlink direction between relay station 300 and terminal 500 (hereinafter, “inter-relay terminal downlink quality information”). ). Relay terminal downlink quality extraction section 105 outputs the extracted relay terminal downlink quality information to scheduler 110.
- the uplink quality calculation unit 106 Based on the pilot signal (or known signal) transmitted from the relay station 300, the uplink quality calculation unit 106 between the base station relays and the radio channel quality information in the uplink direction between the base station 100 and the relay station 300 (hereinafter, “ Measure and calculate "upstream quality information between base station relays”).
- the base station relay inter-relay uplink quality calculation unit 106 outputs the calculated base station relay inter-relay uplink quality information to the scheduler 110.
- the relay terminal uplink quality extraction unit 107 includes, in the received signal output from the demodulation / decoding unit 103, radio channel quality information in the uplink direction between the relay station 300 and the terminal 500 (hereinafter referred to as "relay terminal uplink quality"). Information ").
- the relay terminal uplink quality extraction unit 107 outputs the extracted relay terminal uplink quality information to the scheduler 110.
- the scheduler 110 schedules each radio section based on each quality information. For example, the scheduler 110 performs scheduling in the downlink direction from the base station 100 to the relay station 300 based on the downlink quality information between base station relays. In the first embodiment, the scheduler 110 performs centralized scheduling, receives quality information of each radio section, and performs scheduling.
- the dynamic allocation control unit 111 performs dynamic radio resource allocation with respect to radio resource allocation.
- the dynamic radio resource allocation is a method of dynamically allocating radio resources used by the base station 100 and the relay station 300 without separately dividing them in a radio frame, for example.
- FIG. 11 is a diagram illustrating a configuration example of a radio frame by dynamic radio resource allocation.
- the dynamic allocation control unit 111 outputs information on the allocated radio resource to the dynamic allocation control signal creation unit 112.
- the dynamic allocation control unit 111 controls the reception radio unit 102 or the transmission radio unit 123 so that data can be received or transmitted with the relay station 300 or the like using the allocated radio resource.
- the dynamic allocation control signal creation unit 112 creates a dynamic radio resource allocation control signal (hereinafter, “dynamic allocation control signal”) based on information on radio resources.
- the dynamic allocation control signal creation unit 112 outputs the dynamic allocation control signal to the encoding / modulation unit 122.
- the partial allocation control unit 113 performs partial radio resource allocation regarding radio resource allocation.
- Partial radio resource allocation is a method in which, for example, in a radio frame, radio resources used by the base station 100 and radio resources used by the relay station 300 are divided into different areas, and each radio resource is allocated.
- FIG. 10A and FIG. 10B are diagrams illustrating a configuration example of a radio frame by partial radio resource allocation.
- the partial allocation control unit 113 outputs information on the radio resource to the partial allocation control signal creation unit 114. Also, the partial allocation control unit 113 controls the reception radio unit 102 or the transmission radio unit 123 so that data can be received or transmitted with the relay station 300 or the like using the allocated radio resource.
- the partial allocation control signal creation unit 114 creates a partial radio resource allocation control signal (hereinafter referred to as “partial allocation control signal”) based on information about the radio resource. Partial allocation control signal creation section 114 outputs the partial allocation control signal to encoding / modulation section 122.
- the base station relay communication control signal creation unit 115 creates a base station relay communication control signal including scheduling information between the base station 100 and the relay station 300 based on the scheduling information output from the scheduler 110.
- the base station relay communication control signal creation unit 115 outputs the created base station relay communication control signal to the encoding / modulation unit 122.
- the relay terminal communication control signal creation unit 116 creates a relay terminal communication control signal including scheduling information between the relay station 300 and the terminal 500 based on the scheduling information output from the scheduler 110.
- the relay terminal communication control signal creation unit 116 outputs the created relay terminal communication control signal to the encoding / modulation unit 122.
- the switching control unit 120 switches the radio resource allocation method. For example, the switching control unit 120 switches from partial radio resource allocation to dynamic radio resource allocation based on the radio resource amount and the like. When switching to the partial radio resource allocation, the switching control unit 120 turns on the power of the partial allocation control unit 113 and turns off the power of the dynamic allocation control unit 111. Further, when switching to dynamic radio resource allocation, the switching control unit 120 turns off the power of the partial allocation control unit 113 and turns on the power of the dynamic allocation control unit 111. Details of the switching will be described later. The switching control unit 120 outputs information regarding the radio resource allocation method to the switching control signal creation unit 121.
- the switching control signal creation unit 121 creates a switching control signal including information on the radio resource allocation method based on information on the radio resource allocation method.
- the switching control signal creation unit 121 outputs the switching control signal to the encoding / modulation unit 122.
- the encoding / modulation unit 122 performs encoding and modulation processing on the transmission data according to the scheduling determined by the scheduler 110.
- the encoding / modulation unit 122 may perform encoding or the like on each control signal.
- the transmission radio unit 123 outputs the output from the encoding / modulation unit 122 as a radio signal.
- the radio signal is transmitted to the relay station 300 or the like via the antenna 101.
- FIG. 3 is a diagram illustrating a configuration example of the relay station 300.
- the relay station 300 includes an antenna 301, an uplink reception radio unit 302, a demodulation / decoding unit 303, an encoding / modulation unit 304, an uplink transmission radio unit 305, an antenna 306, and relay radio terminal downlink radio channel quality information.
- An extraction unit (hereinafter “relay quality between relay terminals”) 307, an uplink radio channel quality measurement calculation unit (hereinafter “uplink quality calculation unit”) 308, and an uplink radio channel quality information creation unit (hereinafter “uplink quality calculation unit”) Quality information creation unit ”) 309, scheduler 310, dynamic radio resource allocation control signal extraction unit (hereinafter“ dynamic allocation control signal extraction unit ”) 311 and dynamic radio resource allocation control unit (hereinafter“ dynamic allocation control unit ”).
- Partial radio resource allocation control unit (hereinafter, “partial allocation control unit”) 314, relay terminal communication control signal creation unit 315, switching control signal extraction unit 316, communication control signal extraction unit 317, downlink radio channel quality A measurement unit 318, a downlink reception radio unit 320, a demodulation / decoding unit 321, an encoding / modulation unit 322, and a downlink transmission radio unit 323 are provided.
- the antenna 301 transmits and receives radio signals to and from the terminal 500.
- the uplink reception radio unit 302 outputs a radio signal transmitted from the terminal 500 received by the antenna 301 as a reception signal.
- the demodulation / decoding unit 303 demodulates and decodes the received signal output from the uplink reception radio unit 302 based on the scheduling determined by the scheduler 310.
- the encoding / modulation unit 304 encodes and modulates the received signal output from the demodulation / decoding unit 303 based on the scheduling determined by the scheduler 310 or the like.
- the uplink transmission radio section 305 outputs the reception signal output from the encoding / modulation section 304 to the antenna 306 as a radio signal.
- the antenna 306 transmits and receives radio signals to and from the base station 100.
- the relay inter-terminal downlink quality extraction unit 307 extracts, for example, the relay inter-terminal downlink quality information transmitted from the terminal 500 from the reception signal output from the demodulation / decoding unit 303.
- Relay terminal downlink quality extraction section 307 outputs the extracted relay terminal downlink quality information to scheduler 310.
- Uplink quality calculation section 308 measures and calculates the radio channel quality in the uplink direction between relay station 300 and terminal 500 (hereinafter, “upstream quality between relay terminals”) based on the pilot signal transmitted from terminal 500. To do.
- the uplink quality calculation unit 308 outputs the calculated uplink radio channel quality to the scheduler 310 and the uplink quality information creation unit 309.
- the uplink quality information creation unit 309 creates uplink quality information between relay terminals.
- Uplink quality information creation section 309 outputs the created uplink radio channel quality information to encoding / modulation section 304 and transmits it to base station 100.
- the scheduler 310 performs scheduling related to wireless communication with the subordinate terminal 500. In the first embodiment, since scheduling is performed by Centralized scheduling, the scheduler 310 executes scheduling according to the scheduler 110 of the base station 100.
- the dynamic allocation control signal extraction unit 311 extracts the dynamic allocation control signal transmitted from the base station 100 from the reception signal output from the demodulation / decoding unit 321.
- the dynamic allocation control signal extraction unit 311 outputs the extracted dynamic allocation control signal to the dynamic allocation control unit 312.
- the dynamic allocation control unit 312 performs dynamic radio resource allocation to the subordinate terminal 500 based on the dynamic allocation control signal. However, since dynamic radio resource allocation is performed in the base station 100, the dynamic allocation control unit 312 performs radio resource allocation in accordance with, for example, a dynamic allocation control signal.
- the dynamic allocation control unit 312 controls the uplink reception radio unit 302 and the like so that data can be transmitted or received between the base station 100 and the terminal 500 using the allocated radio resources.
- the partial allocation control signal extraction unit 313 extracts a partial allocation control signal transmitted from the base station 100 from the reception signals output from the demodulation / decoding unit 321 and outputs the partial allocation control signal to the partial allocation control unit 314.
- the partial allocation control unit 314 allocates radio resources to the subordinate terminal 500 in a predetermined area in the radio frame based on the partial allocation control signal. Further, the partial allocation control unit 314 controls the uplink reception radio unit 302 and the like so that data can be transmitted or received between the base station 100 and the terminal 500 using the allocated radio resources.
- the relay terminal communication control signal creation unit 315 inputs scheduling information determined by the scheduler 310 from the scheduler 310 and creates a communication control signal between the relay station 300 and the terminal 500.
- the relay terminal communication control signal creation unit 315 outputs the created relay terminal communication control signal to the encoding / modulation unit 322.
- the relay terminal communication control signal creation unit 315 creates, for example, a pilot signal and transmits the pilot signal to the terminal 500 via the encoding / modulation unit 322.
- the switching control signal extraction unit 316 extracts the switching control signal transmitted from the base station 100 from the reception signals output from the demodulation / decoding unit 321. For example, when the switching control signal includes information instructing switching from partial radio resource allocation to dynamic radio resource allocation, the switching control signal extraction unit 316 turns on the power of the dynamic allocation control unit 312, and the partial allocation control unit 314. Turn off the power. Further, the switching control signal extraction unit 316 turns on the power of the partial allocation control unit 314 and turns off the power of the dynamic allocation control unit 312 when the switching control signal includes information instructing switching to partial radio resource allocation. To do.
- the downlink radio channel quality measurement unit 318 measures the radio channel quality in the downlink direction between the base station 100 and the relay station 300 based on the pilot signal transmitted from the base station 100.
- the downlink radio channel quality information creation unit 319 creates downlink quality information between base station relays based on the downlink radio channel quality measured by the downlink radio channel quality measurement unit 318.
- the downlink radio channel quality information creation unit 319 transmits downlink quality information between base station relays to the base station 100 via the encoding / modulation unit 304 and the like.
- the downlink reception radio unit 320 outputs the radio signal output from the antenna 306 as a reception signal.
- the demodulation / decoding unit 321 demodulates and decodes the reception signal output from the downlink reception radio unit 320 based on scheduling determined by the scheduler 310 or the like.
- the encoding / modulation unit 322 performs encoding and modulation on the received signal output from the demodulation / decoding unit 321 based on the scheduling determined by the scheduler 310.
- the downlink transmission radio unit 323 converts the reception signal output from the encoding / modulation unit 322 into a radio signal and outputs the radio signal to the antenna 301.
- the radio signal is transmitted to terminal 500.
- FIG. 4 is a diagram illustrating a configuration example of the terminal 500.
- the terminal 500 includes an antenna 501, a downlink reception radio unit 502, a demodulation / decoding unit 503, a communication control signal extraction unit 504, a radio resource allocation control signal extraction unit (hereinafter, “allocation control signal extraction unit”) 505, A control signal transmission timing information extraction unit 506, a radio channel quality measurement unit 507, a radio channel quality information creation unit 508, a communication control unit 510, an uplink pilot signal creation unit 511, an encoding / modulation unit 512, And an uplink transmission radio unit 513.
- allocation control signal extraction unit a radio resource allocation control signal extraction unit
- the antenna 501 transmits and receives radio signals to and from the relay station 300.
- the antenna 501 may transmit / receive a radio signal directly to / from the base station 100, for example.
- the downlink reception radio unit 502 outputs the radio signal output from the antenna 501 as a reception signal.
- the demodulation / decoding unit 503 performs demodulation and decoding processing on the reception signal output from the downlink reception radio unit 502 under the control of the communication control unit 510.
- the communication control signal extraction unit 504 extracts a communication control signal (for example, a communication control signal between relay terminals) transmitted from the relay station 300 from the reception signal output from the demodulation / decoding unit 503, and the communication control unit 510. Output to.
- a communication control signal for example, a communication control signal between relay terminals
- the allocation control signal extraction unit 505 extracts a partial allocation control signal or a dynamic allocation control signal transmitted from the base station 100 via the relay station 300 from the reception signal output from the demodulation / decoding unit 503. Allocation control signal extraction section 505 outputs the extracted radio resource allocation control signal to communication control section 510.
- Control signal transmission timing information extraction section 506 extracts transmission timing information of synchronization information and broadcast information transmitted from base station 100 via relay station 300. Control signal transmission timing information extraction section 506 outputs transmission timing information to communication control section 510. The control signal transmission timing information is created by the communication control signal creation units 115 and 116 of the base station 100, for example.
- Radio channel quality measurement section 507 extracts a pilot signal transmitted from relay station 300 from the received signals output from demodulation / decoding section 503, and based on the pilot signal, relay station 300 and terminal 500 Measure the wireless link quality in the downlink direction.
- the radio channel quality information creation unit 508 creates downlink quality information between relay terminals based on the radio channel quality output from the radio channel quality measurement unit 507, and outputs it to the encoding / modulation unit 512.
- the communication control unit 510 controls the demodulation / decoding unit 503 and the like so that the data transmitted from the relay station 300 can be demodulated based on the communication control signal between relay terminals, for example.
- the communication control unit 510 controls the downlink reception radio unit 502 or the uplink transmission radio unit 513 so as to transmit or receive data using radio resources included in the allocation control signal.
- the communication control unit 510 can control the wireless units 502, 513, etc. so that a communication control signal, data, etc. can be transmitted or received according to the control signal transmission timing information.
- Uplink pilot signal creation section 511 creates a pilot signal in the uplink direction with relay station 300, and transmits it to relay station 300 via encoding / modulation section 512 and the like.
- the encoding / modulation unit 512 encodes and modulates transmission data and the like under the control of the communication control unit 510.
- the uplink transmission radio unit 513 outputs the transmission data output from the encoding / modulation unit 512 as a radio signal under the control of the communication control unit 510.
- the radio signal is transmitted to relay station 300 via antenna 501.
- FIG. 5 is a sequence diagram showing an operation example.
- the example shown in FIG. 5 is an example in which the radio resource allocation method is changed from partial radio resource allocation to dynamic radio resource allocation.
- FIG. 6 is a sequence diagram showing an example of the radio channel quality measurement and report sequence 1.
- the base station 100 transmits a downlink pilot signal to the relay station 300 (S100).
- the base station inter-relay communication control signal creation unit 115 creates a downlink pilot signal.
- the relay station 300 measures and calculates the downlink radio channel quality with the base station 100 based on the downlink pilot signal (S101).
- the downlink radio channel quality measurement unit 318 measures and calculates the radio channel quality.
- the relay station 300 transmits a downlink pilot signal to the terminal 500 (S101).
- the relay terminal communication control signal creation unit 315 creates the downlink pilot signal.
- the terminal 500 measures and calculates downlink radio channel quality based on the downlink pilot signal (S103).
- the radio channel quality measurement unit 507 measures and calculates the downlink radio channel quality with the relay station 300.
- the terminal 500 transmits downlink quality information between relay terminals to the relay station 300 (S104).
- the radio channel quality information creation unit 508 creates downlink quality information between relay terminals.
- the terminal 500 transmits an uplink pilot signal to the relay station 300 (S105).
- the uplink pilot signal creation unit 511 creates and transmits the pilot signal.
- the relay station 300 measures and calculates the uplink radio channel quality with the terminal 500 based on the uplink pilot signal transmitted from the terminal 500 (S106).
- the uplink quality calculation unit 308 measures the uplink radio channel quality.
- the relay station 300 transmits the relay inter-terminal downlink quality information transmitted from the terminal 500 to the base station 100 (S107).
- the relay station 300 receives the downlink quality information between relay terminals by the antenna 301 and transmits it to the base station 100 via the uplink reception radio section 302, the demodulation / decoding section 303, and the like.
- the relay terminal downlink quality extraction unit 307 may extract the relay terminal downlink quality information.
- the relay station 300 transmits the calculated uplink quality information between relay terminals (S106) to the base station 100 (S108).
- the uplink quality information creation unit 309 creates the information and transmits it to the base station 100.
- the relay station 300 transmits the calculated downlink quality information between base station relays (S101) to the base station 100 (S109).
- the downlink radio channel quality information creation unit 319 creates the information and transmits it to the base station 100.
- the relay station 300 transmits an uplink pilot signal to the base station 100 (S110).
- the uplink radio channel quality information creation unit 309 creates an uplink pilot signal and transmits it to the base station 100.
- the base station 100 measures and calculates the uplink radio channel quality between the base station 100 and the relay station 300 based on the uplink pilot (S110) (S111).
- the uplink quality calculation unit 106 between base station relays measures the uplink radio channel quality.
- the base station 100 performs scheduling (S11).
- the scheduler 110 performs scheduling of each wireless line based on each quality information (S107 to S109, S111).
- the base station 100 allocates radio resources (S12).
- the partial allocation control unit 113 performs radio resource allocation by partial radio resource allocation based on an instruction from the scheduler 110.
- FIG. 10A and FIG. 10B are diagrams showing an example of radio resource allocation by partial radio resource allocation.
- the horizontal axis is the time axis direction
- the vertical axis is the frequency axis direction.
- the radio frame is in a region where radio resources between the base station 100 and the relay station 300 and radio resources between the relay station 300 and the terminal 500 are determined in advance. Divided.
- the partial allocation control unit 113 allocates radio resources to the relay station 300 and the terminal 500 in each area.
- the example shown in FIG. 5A is an example in which radio resources are allocated to the terminal 500 in which the base station 100 performs direct radio communication without using the relay station 300.
- the example shown in FIG. 10A may include both uplink and downlink radio resources, and examples such as FIG. Similarly, different radio resources may be allocated for the downlink direction.
- the base station 100 transmits a communication control signal (including a communication control signal between base station relays and a communication control signal between relay terminals) and a partial allocation control signal to the relay station 300 (S13).
- a communication control signal including a communication control signal between base station relays and a communication control signal between relay terminals
- a partial allocation control signal to the relay station 300 (S13).
- the partial allocation control signal creation unit 114 creates a partial allocation control signal
- the base station relay communication control signal creation unit 115 and the relay terminal communication control signal creation unit 116 each create a communication control signal
- the base station 100 Send to a communication control signal
- the relay station 300 performs transmission / reception processing related to wireless communication between the base station 100 and the relay station 300 (S14).
- the partial allocation control unit 314 may transmit or receive data using radio resource allocation (for example, FIG. 10A and FIG. 10B) included in the partial allocation control signal so as to transmit or receive data.
- the communication control signal extraction unit 317 extracts a base station relay communication control signal and outputs it to the scheduler 310. Based on the control signal, the scheduler 310 demodulates the data transmitted from the base station 100 or encodes the data transmitted to the base station 100, and the like. 321 etc. are controlled.
- the relay terminal communication control signal and the partial allocation control signal are transmitted to the terminal 500 (S15).
- the relay terminal communication control signal creation unit 315 creates a relay terminal communication control signal.
- the partial resource allocation control signal is transmitted from the demodulation / decoding unit 321 to the terminal 500 via the encoding / modulation unit 322 and the like.
- the base station 100 and the relay station 300 transmit and receive data (S16).
- the relay station 300 performs transmission / reception processing in wireless communication between the relay station 300 and the terminal 500 (S17).
- the partial allocation control unit 314 uses the radio resource included in the partial allocation control signal to transmit or receive data or the like with the terminal 500, such as the downlink transmission radio unit 323, the uplink reception radio unit 302, etc. To control.
- the scheduler 310 controls the encoding / modulating unit 322 and the like so that encoding and the like are performed based on the communication control signal between relay terminals extracted by the communication control signal extracting unit 317.
- the relay station 300 and the terminal 500 transmit and receive data (S18).
- FIG. 7 is a flowchart showing an operation example of the operation mode change process 1.
- the base station 100 sets a threshold Rth1 of the unused radio resource amount (S191). For example, the switching control unit 120 sets the threshold value Rth1.
- the base station 100 calculates an unused radio resource amount Rnotused between relay terminals (S192).
- the partial allocation control unit 113 outputs information regarding the allocated radio resource to the switching control unit 120.
- the switching control unit 113 calculates the amount of unused radio resources between the relay station 300 and the terminal 500 from the information. For example, in the example of FIG. 10B and the like, the switching control unit 113 calculates the ratio of “Empty” in the entire radio resource.
- the base station 100 determines whether or not the unused radio resource amount Rnotused is larger than the threshold value Rth1 (S193). For example, the switching control unit 120 determines.
- the base station 100 checks the remaining data buffer capacity of the relay station 300 (S194). For example, the switching control unit 120 calculates the ratio of the amount of radio resources allocated to the relay station 300 in the whole based on the allocation information from the partial allocation control unit 113, and calculates the data amount according to the ratio. Find the remaining buffer capacity.
- the base station 100 transmits an operation mode change notification indicating the change of the operation mode from partial radio resource allocation to dynamic radio resource allocation (S195).
- the switching control unit 120 instructs the switching control signal creation unit 121 to create a change notification, and the switching control signal creation unit 121 creates a switching control signal including the change notification and transmits it to the relay station 300.
- the relay station 300 may transmit the received switching control signal to the terminal 500.
- the base station 100 calculates the change timing for dynamic radio resource allocation and notifies the relay station 300 (S196).
- the switching control unit 120 calculates the time from the buffer remaining amount (S194) of the relay station 300 until the data held by the relay station 300 disappears from the buffer, and notifies the time as the change timing.
- the change timing may be included in the switching control signal, for example, according to an instruction from the switching control unit 120 to the switching control signal creation unit 121.
- the base station 100 and the relay station 300 change the operation mode (S197). For example, at the change timing (S196), the switching control unit 120 of the base station 100 changes to dynamic radio resource allocation, turns off the power of the partial allocation control unit 113, and turns on the power of the dynamic allocation control unit 111. . In addition, the switching control signal extraction unit 316 of the relay station 300 turns off the power of the partial assignment control unit 314 and turns on the power of the dynamic assignment control unit 312 at the change timing.
- the base station 100 performs the process of S192 again.
- the base station 100, the relay station 300, and the terminal 500 execute the radio channel quality measurement and report sequence 1 (S20 in FIG. 5).
- the base station 100 performs scheduling based on radio channel quality or the like (S21), and performs dynamic radio resource allocation (S22).
- the dynamic allocation control unit 111 dynamically allocates radio resources between the base station 100 and the relay station 300, between the relay station 300 and the terminal 500, etc., without allocating within a pre-divided area.
- FIG. 11 is a diagram illustrating an example of allocation by dynamic radio resource allocation. As shown in the figure, radio resources and the like used in radio communication between the base station 100 and the relay station 300 are assigned to random areas.
- the base station 100 transmits a communication control signal based on scheduling (S21) and an allocation control signal based on dynamic radio resource allocation to the relay station 300 (S23).
- the dynamic allocation control signal creation unit 112 creates a dynamic allocation control signal based on information on radio resource allocation output from the dynamic allocation control unit 111 and transmits the dynamic allocation control signal to the relay station 300.
- the relay station 300 transmits a dynamic allocation control signal and a relay terminal communication control signal to the terminal 500 (S24).
- the dynamic allocation control signal is output from the demodulation / decoding unit 321 to the encoding / modulation unit 322 and transmitted to the terminal 500.
- the relay inter-terminal communication control signal is transmitted from the relay inter-terminal communication control signal creation unit 315 to the terminal 500 by scheduling (S21) by the scheduler 310.
- the base station 100 and the relay station 300 transmit and receive data based on the inter-base station inter-relay communication control signal and the dynamic assignment control signal (S25).
- the relay station 300 and the terminal 500 transmit / receive data based on the relay inter-terminal communication control signal and the dynamic allocation control signal (S26).
- the base station 100 is not used when the unused radio resources among the radio resources allocated between the relay station 300 and the terminal 500 are larger than the threshold (Yes in S193). It is determined that the radio resource is not effectively used by the radio resource. Then, the base station 100 changes the allocation method from partial radio resource allocation (for example, FIG. 10A) to dynamic radio resource allocation (for example, FIG. 11). As a result, for example, as illustrated in FIG. 11, radio resources that are not used are reduced and can be allocated to radio resources for other radio communication, and radio resources are effectively used.
- FIG. 8 is a diagram illustrating a sequence example when the operation mode is changed from dynamic radio resource allocation to partial radio resource allocation.
- the base station 100, the relay station 300, and the terminal 500 execute the radio channel quality measurement and report sequence 1 as in the example of FIG. 5 (S10).
- the base station 100 performs scheduling based on the measured radio channel quality (S11), and allocates radio resources by dynamic radio resource allocation (S31). For example, the dynamic allocation control unit 111 allocates radio resources as shown in FIG.
- the base station 100 transmits a communication control signal (including a communication control signal between base station relays and a communication control signal between relay terminals) and a dynamic allocation control signal to the relay station 300 (S32).
- a communication control signal including a communication control signal between base station relays and a communication control signal between relay terminals
- a dynamic allocation control signal to the relay station 300 (S32).
- the relay station 300 performs transmission / reception processing related to wireless communication between the base station 100 and the relay station 300 (S33).
- the dynamic allocation control unit 312 sets the uplink transmission radio unit 305 or the downlink reception radio unit 320 so that data can be transmitted to or received from the base station 100 using radio resources included in the allocation control signal. Control.
- the relay station 300 transmits a communication control signal between relay terminals and a dynamic allocation control signal to the terminal 500 (S34).
- the dynamic allocation control signal is transmitted from the demodulation / decoding unit 321 to the terminal 500 via the encoding / modulation unit 322 and the like.
- the base station 100 and the relay station 300 transmit or receive data (S35).
- the relay station 300 performs transmission / reception processing related to wireless communication with the terminal 500 (S36).
- the dynamic allocation control unit 312 controls the downlink transmission radio unit 323 or the uplink reception radio unit 302 so that data can be transmitted to or received from the terminal 500 using radio resources included in the allocation control signal. To do.
- the relay station 300 and the terminal 500 transmit or receive data (S37).
- FIG. 9 is a flowchart showing an operation example of the operation mode change process 2.
- the base station 100 When the base station 100 starts processing (S390), it sets a used radio resource amount threshold Rth2 (S391). For example, the switching control unit 120 sets the threshold value Rth2.
- the base station 100 calculates the radio resource amount Rused between the relay terminals (S392).
- the switching control unit 120 inputs information on dynamic radio resource allocation (for example, FIG. 11) from the dynamic allocation control unit 111, and calculates the ratio of radio resources allocated between relay terminals in the total radio resources. To do.
- the base station 100 determines whether or not the used radio resource amount Rused is larger than the threshold value Rth2 (S393). For example, the switching control unit 120 determines.
- the base station 100 checks the remaining buffer capacity of the relay station 300 when the used radio resource amount Rused is larger than the threshold value Rth2 (Yes in S393) (S194).
- the base station 100 transmits an operation mode change notification, notifies the change timing based on the remaining buffer capacity, and changes the operation mode at this timing (S195 to S197).
- the operation mode in this case is changed from dynamic radio resource allocation to partial radio resource allocation.
- the base station 100 ends the operation mode change process 2 (S392).
- the base station 100 performs the process of S392 again.
- the base station 100 or the like executes radio channel quality measurement and report sequence 1 (S20), and the base station 100 performs scheduling (S21). Thereafter, the base station 100 performs radio resource allocation by partial radio resource allocation (S41), transmits a communication control signal and a partial allocation control signal (S42, S43), and data, as in S12 to S18 of FIG. Are transmitted and received (S44, S45).
- the radio resource between the relay terminals is larger than the threshold (Yes in S393)
- the radio resource between the relay station 300 and the terminal 500 is larger than other radio resources. It is possible.
- the base station 100 changes from dynamic radio resource allocation to partial radio resource allocation, so that radio resources used by the relay station 300 and the terminal 500 are spread in a predetermined area, and Effective utilization can be achieved.
- the second embodiment is an example in which the operation mode is changed according to the number of terminals.
- Configuration examples of the base station 100, the relay station 300, and the terminal 500 are the same as those in the first embodiment (FIGS. 2 to 4).
- FIG. 12 is a sequence diagram showing an operation example. S10 to S18 are the same as in the first embodiment. And the base station 100 performs the operation mode change process 3 (S50).
- FIG. 13 is a flowchart showing an operation example of the operation mode change process 3.
- the base station 100 When the base station 100 starts this processing (S500), it sets a terminal number threshold Mth (S501). For example, the switching control unit 120 sets the threshold value Mth.
- the base station 100 calculates the number M of terminals connected to the relay station 300 (S502).
- the switching control unit 120 calculates the number of terminals M by obtaining the number of radio quality information (for example, CQI) between relay terminals transmitted (or reported) to the base station 100.
- the scheduling control unit 120 since the scheduler 110 inputs the downlink quality information between relay terminals from the relay terminal downlink quality extraction unit 105, the switching control unit 120 outputs the number of inputs of the information to the switching control unit 120. calculate.
- the scheduler 110 may output the input number of uplink quality information between relay terminals to the switching control unit 120.
- the scheduler 110 may output an average value of the number of downlink (or uplink) quality information between relay terminals for a certain period to the switching control unit 120.
- the base station 100 determines whether or not the number of terminals M is smaller than the threshold value Mth (S503).
- the switching control unit 120 determines.
- the threshold Mth may be the same value as the unused radio resource amount threshold Rth1 (S191) or the used radio resource amount Rth2 (S391), or may be a different value.
- the base station 100 When the number of terminals M is smaller than the threshold value Mth (Yes in S503), the base station 100 performs a change process from partial radio resource allocation to dynamic radio resource allocation (S194 to S197). And the base station 100 complete
- FIG. 14 is a diagram showing a sequence example when the operation mode is changed from dynamic radio resource allocation to partial radio resource allocation.
- the base station 100 executes the operation mode change process 4 (S51).
- FIG. 15 is a flowchart showing an operation example of the operation mode change process 4.
- the base station 100 changes from dynamic radio resource allocation to partial resource allocation (S194 to S197).
- the base station 100 and the like perform processing such as radio channel quality measurement and report sequence 1 (S20 to S26).
- the radio resources in the first embodiment is changed to the number of terminals in the operation mode change process, and therefore, the radio resources are effectively used in the same manner as in the first embodiment. be able to.
- the third embodiment is an example of changing from distributed scheduling and partial radio resource allocation to centralized scheduling and dynamic radio resource allocation (or vice versa). This is an example in which the scheduling method is changed from distributed scheduling to centralized scheduling (or vice versa) in accordance with the change of the radio resource allocation method.
- FIG. 16 is a diagram illustrating a configuration example of the base station 100.
- the base station 100 further includes an inter-relay terminal radio channel quality information extraction unit (hereinafter “relay terminal quality extraction unit”) 125 and a scheduling method change request signal extraction unit (hereinafter “change request signal extraction unit”) 126.
- relay terminal quality extraction unit an inter-relay terminal radio channel quality information extraction unit
- change request signal extraction unit a scheduling method change request signal extraction unit
- a centralized / distributed switching control unit (hereinafter referred to as “switching control unit”) 127, a centralized / distributed switching control signal creation unit (hereinafter referred to as “switching control signal creation unit”) 128, and a base station relay resource allocation control unit (Hereinafter “base station relay allocation control unit”) 130, base station relay radio resource allocation control signal creation unit (hereinafter “base station relay allocation control signal creation unit”) 131, and relay terminal radio resource Allocation control unit (hereinafter, “relay terminal allocation control unit”) 13 If, between the relay terminal radio resource allocation control signal generator (hereinafter, "relay terminal between assignment control signal creation unit”) and a 133.
- the inter-relay terminal quality extraction unit 125 extracts the inter-relay terminal downlink quality information measured by the terminal 500 or the inter-relay terminal uplink quality information measured by the relay station 300.
- the relay inter-terminal quality extraction unit 125 outputs the extracted radio quality information to the scheduler 110.
- the change request signal extraction unit 126 extracts the scheduling method change request signal (or operation mode change request signal, hereinafter referred to as “change request signal”) transmitted from the relay station 300, and outputs the extracted signal to the switching control unit 127.
- the switching control unit 127 changes the scheduling method (or operation mode) from Distributed scheduling and partial radio resource allocation to Centralized scheduling and dynamic radio resource allocation (or vice versa) according to the change request signal. For example, when switching to the distributed scheduling, the switching control unit 127 turns off the power of the relay terminal allocation control unit 132 and the relay terminal allocation control signal extraction unit 133. Further, when switching to the centralized scheduling, the switching control unit 127 turns on these power supplies.
- the switching control signal creation unit 128 creates a switching control signal indicating a switching destination scheduling method when the scheduling method is switched.
- the switching control signal creation unit 128 outputs the switching control signal to the encoding / modulation unit 122.
- the inter-base station relay allocation controller 130 allocates radio resources to be used for radio communication between the base station 100 and the relay station 300.
- Radio resource allocation includes partial radio resource allocation and dynamic radio resource allocation.
- the inter-base station relay allocation control signal creation unit 131 creates an inter-base station relay allocation control signal based on the radio resource allocated by the inter-base station relay allocation control unit 130.
- the inter-base station relay allocation control signal generating unit 131 outputs the inter-base station relay allocation control signal to the encoding / modulating unit 122.
- the relay inter-terminal allocation control unit 132 allocates radio resources used in radio communication between the relay station 300 and the terminal 500.
- Radio resource allocation includes partial radio resource allocation and dynamic radio resource allocation.
- the inter-relay terminal allocation control signal creation unit 133 creates an inter-relay terminal allocation control signal based on the radio resource allocated by the inter-relay terminal allocation control unit 132.
- the relay terminal allocation control signal creation unit 133 outputs the relay terminal allocation control signal to the encoding / modulation unit 122.
- FIG. 17 is a diagram illustrating a configuration example of the relay station 300.
- the relay station 300 further includes a base station relay downlink radio channel quality measurement calculation unit (hereinafter “base station relay downlink quality calculation unit”) 330 and a base station relay downlink radio channel quality information creation unit (hereinafter “base station relay downlink quality information creation unit ”) 331, relay terminal uplink radio channel quality measurement calculation unit (hereinafter” relay terminal uplink quality calculation unit ”) 332, relay radio terminal uplink radio channel quality information creation unit (Hereinafter referred to as “inter-relay terminal uplink quality information creation unit”) 333, a centralized / distributed switching control unit (hereinafter referred to as “switching control unit”) 335, and a centralized / distributed switching control signal extraction / creation unit (hereinafter referred to as “switching”).
- base station relay downlink quality calculation unit a base station relay downlink quality measurement calculation unit
- Base station relay downlink quality information creation unit base station relay downlink quality information creation unit
- Control signal extraction / creation unit 336, control signal creation unit 337, and base station relay communication control signal extraction unit ( below, “communication control signal extraction unit between base station relays”) 338, radio resource allocation control signal extraction unit between base station relays (hereinafter “base station relay allocation control signal extraction unit”) 340, and between base station relays Radio resource allocation control unit (hereinafter “inter-base station relay allocation control unit”) 341 and relay terminal radio resource allocation control signal extraction / creation unit (hereinafter “relay terminal allocation control signal extraction / creation unit”) 342 And an inter-relay terminal radio resource allocation control unit (hereinafter, “inter-relay terminal allocation control unit”) 343 and a radio resource management unit 344.
- Base station relay downlink quality calculation section 330 measures and calculates the downlink radio channel quality between base station 100 and relay station 300 based on the downlink pilot signal transmitted from base station 100.
- the base station relay downlink quality information creation unit 331 creates base station relay downlink quality information from the radio channel quality calculated by the base station relay downlink quality calculation unit 330.
- the inter-base station relay downlink quality information creation unit 331 outputs the created inter-base station relay downlink quality information to the encoding / modulation unit 304.
- the relay inter-terminal uplink quality calculation unit 332 measures and calculates the uplink radio channel quality between the relay station 300 and the terminal 500 based on the uplink pilot signal transmitted from the terminal 500.
- the relay terminal uplink quality information creation unit 333 creates relay terminal uplink quality information from the radio channel quality calculated by the relay terminal uplink quality calculation unit 332.
- Relay inter-terminal uplink quality information creation section 333 outputs relay inter-terminal uplink quality information to encoding / modulation section 304.
- the switching control unit 335 performs switching of the scheduling method. In addition, the switching control unit 335 also determines whether or not to create a scheduling method change request, and when creating the change request, instructs the control signal creating unit 337 to create a control signal indicating the change request. . In addition, the switching control unit 335 outputs the buffer remaining amount of data held in the relay station 300 to the control signal creating unit 337, thereby notifying the base station 100 of the buffer remaining amount included in the change request signal.
- the switching control signal extraction / creation unit 336 extracts the switching control signal transmitted from the base station 100 and indicating the scheduling method change notification, and outputs the switching control signal to the switching control unit 335. Further, the switching control signal extraction / creation unit 336 creates a switching control signal according to an instruction from the switching control unit 335 and outputs the switching control signal to the encoding / modulation unit 322.
- the base station relay communication control signal extraction unit 338 extracts the base station relay communication control signal transmitted from the base station 100 and outputs it to the scheduler 310.
- the inter-base station relay allocation control signal extraction unit 340 extracts the inter-base station relay allocation control signal transmitted from the base station 100 and outputs it to the inter-base-station relay allocation control unit 341.
- the inter-base station relay allocation control unit 341 uses the radio resource included in the inter-base station relay allocation control signal so that data can be transmitted to or received from the base station 100, or the uplink transmission radio unit 305 or the downlink Control reception radio section 320 and the like.
- the inter-relay terminal allocation control signal extraction / creation unit 342 extracts the inter-relay terminal allocation control signal transmitted from the base station 100, and outputs the signal to the inter-relay terminal allocation control unit 343. Also, the inter-relay terminal allocation control signal extraction / creation unit 342 creates an inter-relay terminal allocation control signal according to an instruction from the inter-relay terminal allocation control unit 343 and outputs the inter-relay terminal allocation control signal to the encoding / modulation unit 322.
- the relay terminal allocation control unit 343 uses the radio resource included in the relay terminal allocation control signal to transmit or receive data to or from the terminal 500 so that the downlink transmission radio unit 323 or the uplink reception radio unit 302 can transmit data. Control etc. Also, the relay terminal allocation control unit 343 allocates radio resources to the subordinate terminal 500 when the centralized scheduling is switched to the distributed scheduling under the control of the switching control unit 335. In this case, the inter-relay terminal allocation control unit 343 outputs information on the allocated radio resource to the inter-relay terminal allocation control signal extraction / creation unit 342, and instructs creation of the inter-relay terminal allocation control signal and transmission to the terminal 500. To do.
- the radio resource management unit 344 manages radio resources used in radio communication between the relay station 300 and the terminal 500. Details will be described later.
- the configuration example of the terminal 500 is the same as that of the first embodiment (for example, FIG. 4).
- FIG. 18 and 19 are sequence diagrams showing an operation example.
- the example illustrated in FIG. 18 and the like shows an example of changing from distributed scheduling (and partial radio resource allocation) to centralized scheduling (and dynamic radio resource allocation).
- FIG. 20 is a sequence diagram showing an example of radio channel quality measurement and report sequence 2.
- the relay station 300 transmits a downlink pilot signal to the terminal 500 (S601).
- the relay terminal communication control signal creation unit 315 creates the downlink pilot signal.
- the terminal 500 measures and calculates the downlink radio channel quality in the downlink direction with the relay station 300 (S602).
- the radio channel quality measurement unit 507 measures and calculates the radio channel quality based on the downlink pilot signal.
- the terminal 500 transmits downlink quality information between relay terminals to the relay station 300 (S603).
- the radio channel quality information creation unit 508 creates and transmits downlink quality information between relay terminals based on the radio channel quality measured by the radio channel quality measurement unit 507.
- the terminal 500 transmits an uplink pilot signal to the relay station 300 (S604).
- the uplink pilot signal creation unit 511 creates and transmits an uplink pilot signal.
- the relay station 300 measures and calculates the uplink radio channel quality between the relay station 300 and the terminal 500 based on the uplink pilot signal (S605).
- the relay terminal uplink quality calculation unit 332 measures and calculates.
- the base station 100 transmits a downlink pilot signal to the relay station 300 (S606).
- the base station relay communication control signal creation unit 115 creates and transmits a downlink pilot signal.
- the relay station 300 measures and calculates the quality of the radio channel in the downlink direction between the base station 100 and the relay station 300 based on the downlink pilot signal from the base station 100 (S607).
- the downlink quality calculation unit 330 between base station relays measures and calculates the radio channel quality.
- the relay station 300 transmits the downlink quality information between base station relays to the base station 100 (S608).
- the downlink quality information creation unit 331 between base station relays creates and transmits the quality information.
- the relay station 300 transmits an uplink pilot signal to the base station 100 (S609).
- the control signal creation unit 337 creates and transmits an uplink pilot signal.
- the base station 100 measures and calculates the uplink radio channel quality between the base station 100 and the relay station 300 based on the uplink pilot signal (S610).
- the uplink quality calculation unit 106 between base station relays measures and calculates.
- the base station 100 and the relay station 300 perform distributed scheduling based on each wireless channel quality (S61 and S62 in FIG. 18).
- the base station 100 performs scheduling for the relay station 300 and subordinate terminals.
- the relay station 300 performs scheduling for the terminals 500 under the relay station 300. Scheduling is performed by the schedulers 110 and 310.
- the base station 100 and the relay station 300 allocate radio resources (S62, S63).
- Base station 100 and relay station 300 perform radio resource allocation by partial radio resource allocation.
- the inter-base station relay allocation control unit 130 and the inter-relay terminal allocation control unit 343 each allocate radio resources.
- the base station 100 transmits a communication control signal between base station relays and an allocation control signal between base station relays to the relay station 300 (S65).
- the base station relay communication control signal creation unit 115 creates and transmits a base station relay communication control signal
- the base station relay assignment control signal creation unit 131 creates and transmits a base station relay assignment control signal.
- the base station 100 and the relay station 300 transmit and receive data (S66).
- the relay station 300 transmits a communication control signal between relay terminals and an assignment control signal between relay terminals to the terminal 500 (S67).
- the relay terminal communication control signal creation unit 315 creates and transmits a relay terminal communication control signal
- the relay terminal allocation control signal extraction / creation unit 342 creates and transmits a relay terminal allocation control signal.
- the relay station 300 and the terminal 500 transmit and receive data (S68).
- FIG. 21 is a flowchart illustrating an example of the operation mode change process.
- the relay station 300 When the relay station 300 starts processing (S690), it sets an unused radio resource amount threshold Rth1 (S191), calculates an unused radio resource amount Rnotused between relay terminals (S192), and the unused radio resource amount Rnotused is It is determined whether or not it is larger than the threshold value Rth1 (S193).
- the radio resource management unit 344 calculates the ratio of the radio resources allocated by the inter-relay terminal allocation control unit 343 to the total radio resources, and outputs the calculated amount to the switching control unit 335. This can be implemented by comparing the threshold Rth1 set by the switching control unit 335 with the calculated amount.
- the relay station 300 checks the remaining buffer capacity of data held in the relay station 300 (S194). For example, the radio resource management unit 344 calculates the data amount based on the radio resource amount allocated between the relay station 300 and the terminal 500, and outputs the data amount to the switching control unit 335. Thereby, the switching control unit 335 confirms the remaining buffer capacity.
- the relay station 300 transmits an operation mode change request to the base station 100 (S691).
- the control signal creation unit 337 creates and transmits a control signal including the change request. Further, the control signal creation unit 337 creates the buffer residual amount by including it in the control signal.
- the base station 100 When receiving the operation mode change request, the base station 100 performs scheduling method change control (S71 in FIG. 18). For example, the change request signal extraction unit 126 extracts a control signal including the change request. Then, based on the extracted control signal, the switching control unit 127 instructs the creation of a switching control signal indicating that the scheduling method is to be changed from distributed scheduling to centralized scheduling. Further, the switching control unit 127 determines the operation mode change timing from the remaining buffer capacity notified from the relay station 300 and outputs the timing to the switching control signal creation unit 128. The switching control signal creation unit 128 creates a switching control signal including the operation mode change timing and the change request, and transmits it to the relay station 300.
- the change request signal extraction unit 126 extracts a control signal including the change request. Then, based on the extracted control signal, the switching control unit 127 instructs the creation of a switching control signal indicating that the scheduling method is to be changed from distributed scheduling to centralized scheduling. Further, the switching control unit 127 determines the operation mode
- the relay station 300 receives the switching control signal (or the operation mode change notification) (S692) and receives the change timing (S693).
- the switching control signal extraction / creation unit 336 receives the operation mode change notification and the change timing by extracting the switching control signal.
- the base station 100 and the relay station 300 change the operation mode to Centralized scheduling (and dynamic radio resource allocation) at the change timing (S694).
- the switching control unit 127 turns off power to the inter-relay terminal allocation control unit 132, the inter-relay terminal allocation control signal creation unit 133, the inter-relay terminal communication control signal creation unit 116, and the like at the change timing.
- the switching control unit 335 turns off the power to the relay terminal allocation control unit 343, the relay terminal allocation control signal extraction / creation unit 342, and the like.
- the relay station 300 ends the operation mode change process 5 (S695).
- the base station 100, the relay station 300, and the terminal 500 execute the radio channel quality measurement and report sequence 1 (S75).
- the radio channel quality measurement and reporting sequence 1 is the same as that in the first embodiment (for example, FIG. 6).
- the base station 100 performs centralized scheduling based on each radio channel quality (S76) and performs dynamic radio resource allocation (S77).
- the base station 100 transmits a communication control signal and an allocation control signal to the relay station 300 (S78), and the relay station 300 performs transmission / reception processing based on the communication control signal and the like (S79).
- the base station 100 and the relay station 300 transmit / receive data (S81).
- the relay station 300 transmits a communication control signal between relay terminals and an allocation control signal between relay terminals to the terminal 500 (S80), performs transmission / reception processing (S82), and transmits / receives data (S83).
- the radio resource allocation is changed from the partial radio resource allocation to the dynamic radio resource allocation.
- the scheduling method is changed from Distributed scheduling to Centralized scheduling. Therefore, since radio resource allocation is changed to dynamic radio resource allocation, radio resources can be effectively utilized as in the first embodiment.
- FIG. 22 is a diagram illustrating a sequence example when the operation mode is changed from Centralized scheduling (and dynamic radio resource allocation) to Distributed scheduling (and partial radio resource allocation).
- the base station 100 performs centralized scheduling or the like (S76 to S78), transmits and receives data (S79 to S83), and the base station 100 performs an operation mode change process 6 (S90).
- the operation mode change process 6 is the same as the operation mode change process 2 (for example, FIG. 9) of the first embodiment.
- the base station 100 transmits an operation mode change notification and a change timing notification to the relay station 300 (S195, S196).
- the radio resource allocation is changed from the dynamic radio resource allocation to the partial radio resource allocation, and the scheduling method is also changed from the centralized scheduling to the distributed scheduling.
- the base station 100 and the like After the scheduling method is changed to Distributed scheduling, the base station 100 and the like perform processing from radio channel quality measurement and report sequence 2 (S60) to data transmission / reception (S68).
- the base station 100 changes the operation mode to distributed scheduling and partial radio resource allocation, so that radio resources are spread in the radio resource area between the relay station 300 and the terminal 500, and the radio resources are effectively used. Can do.
- the relay method of the relay station 300 is changed from AF relay (and Centralized scheduling and partial radio resource allocation) to DF relay (and Distributed scheduling and dynamic radio resource allocation) (or vice versa). It is an example.
- the fourth embodiment is an example in which the relay scheme of the relay station 300 is also changed in accordance with the change of radio resource allocation and scheduling method.
- FIG. 23 is a diagram illustrating a configuration example of the base station 100 in the fourth embodiment.
- the base station 100 further includes a base station terminal downlink radio channel quality information extraction unit (hereinafter, “base station terminal downlink quality extraction unit”) 140 and a base station terminal uplink radio channel quality measurement calculation unit (hereinafter, “ Base station terminal uplink quality calculation unit ”) 141, AD / DF switching request signal extraction unit (hereinafter” switching request signal extraction unit ”) 142, AF / DF switching control unit (hereinafter” switching control unit ”) 143, an AF / DF switching control signal creation unit (hereinafter “switching control signal creation unit”) 144, a base station terminal communication control signal creation unit 145, and a base station terminal radio resource allocation control unit (hereinafter “ Base station terminal allocation control unit ”) 146 and base station terminal radio resource allocation control signal creation unit (hereinafter referred to as” base station terminal allocation control signal creation unit ”) 147.
- base station terminal downlink quality extraction unit base station terminal up
- Base station terminal downlink quality extraction section 140 extracts radio channel quality information in the downlink direction between base station 100 and terminal 500 via relay station 300 (hereinafter, “base station terminal downlink quality information”).
- the base station terminal downlink quality extraction section 140 outputs the base station terminal downlink quality information to the scheduler 110.
- Base station inter-terminal uplink quality calculation section 141 extracts an uplink pilot signal transmitted from terminal 500 via relay station 300, and based on the pilot signal, base station 100 and terminal 500 via relay station 300 Measure and calculate the wireless communication line quality during The base station terminal uplink quality calculation unit 141 outputs the calculated wireless communication channel quality information (hereinafter, “base station terminal uplink quality information”) to the scheduler 110.
- base station terminal uplink quality information the calculated wireless communication channel quality information
- the switching request signal extraction unit 142 extracts the switching request signal transmitted from the relay station 300 and outputs it to the switching control unit 143.
- the switching control unit 143 changes the relay method of the relay station 300 from the DF method to the AF method (or vice versa) according to the switching request signal. Further, the switching control unit 143 changes from distributed scheduling and partial radio resource allocation to centralized scheduling and dynamic radio resource allocation (or vice versa) in accordance with the change from the DF scheme to the AF scheme (or vice versa). The switching control unit 143 changes the operation mode at the change timing as in the first embodiment.
- the switching control signal creation unit 144 creates a switching control signal including an operation mode change notification based on an instruction from the switching control unit 143, and outputs the switching control signal to the encoding / modulation unit 122.
- the base station terminal-to-terminal communication control signal creation unit 145 operates when the relay method is the AF method, and based on the scheduling information output from the scheduler 110, between the base station 100 and the terminal 500 via the relay station 300. A control signal related to scheduling when performing wireless communication is created.
- the base station terminal communication control signal creation unit 145 outputs the control signal (hereinafter, “base station terminal communication control signal”) to the encoding / modulation unit 122.
- the inter-base station terminal allocation control unit 146 operates in the AF method, and allocates radio resources to be used when the base station 100 and the terminal 500 perform radio communication via the relay station 300 according to an instruction from the scheduler 110. I do.
- the inter-base station terminal allocation control signal creation unit 147 is based on the radio resource information output from the inter-base station inter-terminal allocation control unit 146 and assigns an allocation control signal (hereinafter, “inter-base station inter-terminal allocation control signal”). ]) To the encoding / modulation unit 122.
- FIG. 24 is a diagram illustrating a configuration example of the relay station 300 in the fourth embodiment.
- the relay station 300 further includes an AF / DF switching control signal extraction / creation unit (hereinafter “switching control signal extraction / creation unit”) 350, an AF / DF switching control unit (hereinafter “switching control unit”) 351, Is provided.
- switching control signal extraction / creation unit an AF / DF switching control signal extraction / creation unit
- switching control unit AF / DF switching control unit
- the switching control signal extraction / creation unit 350 extracts the switching control signal transmitted from the base station 100 and outputs it to the switching control unit 351. Further, the switching control signal extraction / creation unit 350 creates a switching control signal according to an instruction from the switching control unit 351 and transmits the switching control signal to the terminal 500.
- the switching control unit 351 controls the power on / off of the encoding / modulating unit 304 and the like based on the switching control signal from the switching control signal extracting / creating unit 350. For example, when the switching control unit 351 is instructed to switch to the AF method, the switching control unit 351 supplies power to each unit 302 in the relay station 300 except for the uplink transmission radio unit 305, the downlink transmission radio unit 323, and the antennas 301 and 306. Turn off. In addition, when the switching control unit 351 is instructed to switch to the DF method, the switching control unit 351 turns on the power of the other units 302 and the like that are turned off.
- FIG. 1 A configuration example of the terminal 500 is shown in FIG. 1
- 25 and 26 are sequence diagrams showing an operation example.
- the example shown in FIG. 25 and the like is an example of changing from Distributed scheduling and partial radio resource allocation by the DF method to Centralized scheduling and dynamic radio resource allocation by the AF method.
- the fourth embodiment also performs the processing from S60 to S68 in the same manner as the third embodiment.
- the operation mode change process 7 is the same as the operation mode change process 5 (for example, FIG. 21) of the third embodiment.
- the base station 100 determines that radio communication between the relay station 300 and the terminal 500 is not frequently performed, and sets the operation mode. Change (S194, S691 to S694).
- the operation mode in this case is changed from Distributed scheduling and partial radio resource allocation in the DF scheme to Centralized scheduling and dynamic radio resource allocation in the AF scheme.
- the relay station 300 Since the relay station 300 operates as the AF method after the change, the uplink transmission radio unit 305 and the downlink transmission radio unit 323 that amplify data and the like, the antennas 301 and 306, the switching control signal extraction / creation unit 350, and the switching control unit 351. Operates with the power on, but the rest does not work.
- FIG. 27 is a diagram illustrating a sequence example of the radio channel quality measurement and report sequence 3.
- the base station 100 transmits a downlink pilot signal to the relay station 300 (S801).
- the base station terminal communication control signal creation unit 145 creates and transmits a downlink pilot signal.
- the relay station 300 relays the downlink pilot signal to the terminal 500 (S802). For example, since relay station 300 operates as an AF method, downlink transmission radio section 323 amplifies and transmits a downlink pilot signal.
- the terminal 500 measures and calculates the downlink radio channel quality between the base station 100 and the terminal 500 via the relay station 300 based on the downlink pilot signal (S803), and reports to the relay station 300 (S804).
- the radio channel quality measurement unit 507 performs measurement and calculation
- the radio channel quality information creation unit 508 creates and transmits radio channel quality information (hereinafter, “downstream quality information between base station terminals”).
- the relay station 300 relays downlink quality information between base station terminals (S805).
- the uplink transmission radio section 305 amplifies and transmits downlink quality information between base station terminals.
- the downlink quality extraction unit 140 between base station terminals of the base station 100 extracts downlink quality information between base station terminals.
- the terminal 500 transmits an uplink pilot signal to the relay station 300 (S806).
- the relay station 300 relays the uplink pilot signal to the base station 100 (S807).
- the uplink transmission radio section 305 amplifies and transmits an uplink pilot signal.
- the base station 100 measures and calculates the uplink quality between base station terminals based on the uplink pilot signal (S808).
- the inter-base station terminal uplink quality calculation unit 141 measures and calculates the uplink quality between base station terminals.
- the base station 100 performs scheduling for the terminal 500 connected via the relay station 300 based on each radio channel quality information (S81).
- the scheduler 110 performs scheduling. In this case, Centralized scheduling is performed.
- the base station 100 allocates radio resources to the terminal 500 (S82).
- the inter-base station terminal allocation control unit 146 performs allocation.
- the base station 100 creates a communication control signal between base station terminals and an allocation control signal between base station terminals according to scheduling (S81) and radio resource allocation (S82), and transmits them to the relay station 300 (S83). .
- the relay station 300 relays the base station terminal communication control signal and the base station terminal allocation control signal to the terminal 500 (S84).
- the downlink transmission radio unit 323 amplifies and transmits these control signals.
- the base station 100 and the terminal 500 transmit / receive data via the relay station 300 (S85, S86).
- the downlink transmission radio unit 323 and the uplink transmission radio unit 305 amplify and transmit data.
- the relay method when the amount of unused radio resources between the relay station 300 and the terminal 500 is larger than the threshold value, the relay method is changed from the DF method to the AF method (S694). At that time, the scheduling method is also changed from Distributed scheduling to Centralized scheduling, and further changed from partial radio resource allocation to dynamic radio resource allocation. Therefore, in the fourth embodiment, it is possible to effectively use radio resources as in the first embodiment.
- FIG. 28 is a sequence diagram showing an example in which the operation mode is changed from the centralized scheduling and dynamic radio resource allocation by the AF method to the distributed scheduling and partial radio resource allocation by the DF method.
- the base station 100 etc. performs the processing from S80 to S86.
- the base station 100 performs an operation mode change process 8 (S90).
- the operation mode change process 8 performs the same process as the operation mode change process 2 (for example, FIG. 9) of the first embodiment.
- the base station 100 transmits an operation mode change notification indicating a change from the centralized scheduling and dynamic radio resource allocation by the AF method to the distributed scheduling and partial radio resource allocation by the DF method (S196).
- the base station 100 and the relay station 300 change the operation mode from the centralized scheduling and dynamic radio resource allocation by the AF method to the distributed scheduling and partial radio resource allocation by the DF method (S901).
- the relay station 300 operates by turning on the power of the other portions 302 other than the uplink transmission wireless unit 305 and the like.
- the power of the inter-base station inter-terminal allocation control unit 146 and the like is turned off, and the power of the inter-base station relay allocation control unit 130 and the like is turned on and operates.
- error correction for relay data is performed by, for example, the encoding / modulation units 304 and 322.
- the base station 100 changes the relay method from the AF method to the DF method.
- the radio resource allocation is changed from the dynamic radio resource allocation to the partial radio resource allocation, radio resources are spread in the radio resource area between the relay station 300 and the terminal 500, and the radio resources are effectively used. Can do.
- the base station 100 and the relay station 300 switch the relay method at the change timing.
- the base station 100 may calculate the change timing in consideration of a delay generated in processing such as encoding. For example, after calculating the change timing, the switching control unit 351 adds the processing delay, and notifies the relay station 300 of this as the change timing.
- the base station 100 and the relay station 300 are changed from, for example, the DF method to the AF method at a change timing in consideration of processing delay.
- the wireless communication system 10 has a transmission delay due to the provision of the relay station 300.
- the base station 100 may transmit the timing delayed by the transmission delay to the relay station 300 as the change timing.
- Such an example can be implemented in the first to fourth embodiments described above.
- Base station apparatus base station
- Base station relay downlink radio channel quality information extraction unit base station relay downlink quality extraction unit
- 105 Downlink radio channel quality information extraction unit between relay terminals (downlink quality extraction unit between relay terminals)
- 106 Uplink radio channel quality measurement calculation unit between base station relays (uplink quality calculation unit between base station relays)
- 107 Upstream radio channel quality information extraction unit between relay terminals (upstream quality extraction unit between relay terminals)
- 112 Dynamic radio resource allocation control signal creation unit (dynamic allocation control signal creation unit)
- 113 Partial radio resource allocation control unit (partial allocation control unit)
- 114 Partial radio resource allocation control signal creation unit (partial allocation control signal creation unit)
- 115 Inter-base station communication control signal creation unit
- 120 Radio resource allocation control method switching control unit (switching control unit)
- 121 Radio resource allocation control method switching control signal creation unit (switching control signal creation unit (switching control signal creation unit (s
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Abstract
Description
第1の実施例について説明する。図1は第1の実施例における無線通信システム10の構成例を示す図である。無線通信システム10は、基地局装置eNB(eNode B)100と、中継局装置RN(Relay Node)300と、端末装置UE(User Equipment)500とを備える。
次に第2の実施例について説明する。第2の実施例は端末数に応じて動作モードを変更する例である。基地局100と中継局300、及び端末500の構成例は第1の実施例と同様である(図2~図4)。
次に第3の実施例について説明する。第3の実施例は、Distributedスケジューリングかつ部分無線リソース割り当てから、Centralizedスケジューリングかつダイナミック無線リソース割り当てに変更する(又はその逆)例である。無線リソースの割り当て方法の変更に伴い、スケジューリング方法もDistributredスケジューリングからCentralizedスケジューリング(又はその逆)に変更する例である。
次に第4の実施例について説明する。第4の実施例は、中継局300の中継方式がAFリレー(かつCentralizedスケジューリングであり部分無線リソース割り当て)、からDFリレー(かつDistributedスケジューリングでありダイナミック無線リソース割り当て)に変更する(又はその逆)例である。本第4の実施例は、無線リソース割り当てとスケジューリング方法の変更に伴い、中継局300の中継方式も変更する例である。
第4の実施例において、基地局100と中継局300は、変更タイミングにおいて中継方式を切替えるようにした。一般に、DF方式はAF方式と比較して符号化等の処理を行う分だけ処理及び制御に遅延が発生する。そこで、基地局100は、符号化等の処理等で発生する遅延分を考慮して変更タイミングを演算するようにしてもよい。例えば、切替え制御部351は、変更タイミングを演算後、処理遅延分を加算し、これを変更タイミングとして中継局300に通知する。基地局100と中継局300は、処理遅延分を考慮した変更タイミングで、例えばDF方式からAF方式に変更される。
104:基地局リレー間下り無線回線品質情報抽出部(基地局リレー間下り品質抽出部)
105:リレー端末間下り無線回線品質情報抽出部(リレー端末間下り品質抽出部)
106:基地局リレー間上り無線回線品質測定算出部(基地局リレー間上り品質算出部)
107:リレー端末間上り無線回線品質情報抽出部(リレー端末間上り品質抽出部)
110:スケジューラ
111:ダイナミック無線リソース割り当て制御部(ダイナミック割り当て制御部)
112:ダイナミック無線リソース割り当て制御信号作成部(ダイナミック割り当て制御信号作成部)
113:部分無線リソース割り当て制御部(部分割り当て制御部)
114:部分無線リソース割り当て制御信号作成部(部分割り当て制御信号作成部)
115:基地局リレー間通信制御信号作成部
116:リレー端末間通信制御信号作成部
120:無線リソース割り当て制御方法切替え制御部(切替え制御部)
121:無線リソース割り当て制御方法切替え制御信号作成部(切替え制御信号作成部)
125:リレー端末間無線回線品質情報抽出部(リレー端末間品質抽出部)
126:スケジューリング方法変更要求信号抽出部(変更要求信号抽出部)
127:Centralized/Distributed切替え制御部(切替え制御部)
128:Centralized/Distributed切替え制御信号作成部(切替え制御信号作成部)
130:基地局リレー間無線リソース割り当て制御部(基地局リレー間割り当て制御部)
131:基地局リレー間無線リソース割り当て制御信号作成部(基地局リレー間割り当て制御信号作成部)
132:リレー端末間無線リソース割り当て制御部(リレー端末間割り当て制御部)
133:リレー端末間無線リソース割り当て制御信号作成部(リレー端末割り当て制御信号作成部)
140:基地局端末間下り無線回線品質情報抽出部(基地局端末間下り品質抽出部)
141:基地局端末間上り無線回線品質測定算出部(基地局端末間上り品質算出部)
142:AF/DF切替え要求信号抽出部(切替え要求信号抽出部)
143:AF/DF切替え制御部(切替え制御部)
144:AF/DF切替え制御信号作成部(切替え制御信号作成部)
145:基地局端末間通信制御信号作成部
146:基地局端末間無線リソース割り当て制御部(基地局端末間割り当て制御部)
147:基地局端末間無線リソース割り当て制御信号作成部(基地局端末間割り当て制御信号作成部)
300:中継局装置(中継局)
307:リレー端末間下り無線回線品質情報抽出部(リレー端末間下り品質抽出部)
308:上り無線回線品質測定算出部(上り品質算出部)
309:上り無線回線品質情報作成部(上り品質情報作成部)
310:スケジューラ
311:ダイナミック無線リソース割り当て制御信号抽出部(ダイナミック割り当て制御信号抽出部)
312:ダイナミック無線リソース割り当て制御部(ダイナミック割り当て制御部)
313:部分無線リソース割り当て制御信号抽出部(部分割り当て制御信号抽出部)
314:部分無線リソース割り当て制御部(部分割り当て制御部)
315:リレー端末間通信制御信号作成部
316:切替え制御信号抽出部 317:通信制御信号抽出部
330:基地局リレー間下り無線回線品質測定算出部(基地局リレー間下り品質算出部)
331:基地局リレー間下り無線回線品質情報作成部(基地局リレー間下り品質情報作成部)
332:リレー端末間上り無線回線品質測定算出部(リレー端末間上り品質算出部)
333:リレー端末間上り無線回線品質情報作成部(リレー端末間上り品質情報作成部)
335:Centralized/Distributed切替え制御部(切替え制御部)
336:Centralized/Distributed切替え制御信号抽出/作成部(切替え制御信号抽出/作成部)
337:制御信号作成部
338:基地局リレー間通信制御信号抽出部(基地局リレー間通信制御信号抽出部)
340:基地局リレー間無線リソース割り当て制御信号抽出部(基地局リレー間割り当て制御信号抽出部)
341:基地局リレー間無線リソース割り当て制御部(基地局リレー間割り当て制御部)
342:リレー端末間無線リソース割り当て制御信号抽出/作成部(リレー端末間割り当て制御信号抽出/作成部)
343:リレー端末間無線リソース割り当て制御部(リレー端末間割り当て制御部)
344:無線リソース管理部
350:AF/DF切替え制御信号抽出/作成部(切替え制御信号抽出/作成部)
351:AF/DF切替え制御部(切替え制御部)
500:端末装置(端末) 504:通信制御信号抽出部
505:無線リソース割り当て制御信号抽出部(割り当て制御信号抽出部)
506:制御信号送信タイミング情報抽出部
507:無線回線品質測定部 508:無線回線品質情報作成部
510:通信制御部
Claims (13)
- 中継局装置を介して基地局装置と端末装置との間で無線通信を行う無線通信システムにおいて、
前記基地局装置は、
前記中継局装置と前記端末装置に対する無線リソースの割り当て方式、又は前記無線リソースの割り当て方式及びスケジューリング方式、又は前記無線リソースの割り当て方式及びスケジューリング方式及び前記中継局装置における中継方式、のうち少なくともいずれかを変更する変更部と、
前記変更部により変更したことを示す変更通知を前記中継装置に送信する送信部とを備え、
前記中継装置は、
前記変更通知を受信する受信部を備え、
前記基地局装置、前記中継局装置、及び前記端末装置は、少なくとも変更後の前記無線リソースの割り当て方式により割り当てた又は割り当てられた前記無線リソースを用いて無線通信を行うことを特徴とする無線通信システム。 - 前記変更部は、前記端末装置の無線リソース量または前記端末装置の数に基づいて、前記変更を行うことを特徴とする請求項1記載の無線通信システム。
- 前記変更部は、前記中継装置に記憶された送信データのデータ量に基づいて前記変更の変更タイミングを決定し、
前記送信部は、前記変更タイミングを前記変更通知に含めて前記中継装置に送信することを特徴とする請求項1記載の無線通信システム。 - 前記無線リソースの割り当て方式は、時間領域と周波数領域とを有する無線フレームが予め分割され分割された領域内で、前記基地局装置と前記中継局装置間の無線通信で使用される第1の無線リソースと前記中継局装置と前記端末装置間の無線通信で使用される第2の無線リソースとが各々割り当てられる第1の割り当て方式、又は前記無線フレーム内において第1及び第2の無線リソースがランダムに割り当てられる第2の割り当て方式であり、
前記変更部は、前記第1又は第2の割り当て方式に変更することを特徴とする請求項1記載の無線通信システム。 - 前記変更部は、前記端末装置の無線リソース量または前記端末装置の数が閾値以上のとき、前記第1の割り当て方式に変更し、前記無線リソース量または前記端末装置の数が閾値未満のとき、前記第2の割り当て方式に変更することを特徴とする請求項4記載の無線通信システム。
- 前記スケジューリング方式は、前記基地局装置においてスケジューリングを行う第1のスケジューリング方式、又は前記基地局装置と前記中継局装置においてスケジューリングを行う第2のスケジューリング方式であり、
前記変更部は、前記第1又は第2のスケジューリング方式に変更することを特徴とする請求項4記載の無線通信システム。 - 前記変更部は、前記端末装置の無線リソース量または前記端末装置の数が閾値以上のとき、前記第2のスケジューリング方式に変更し、前記無線リソース量または前記端末装置の数が閾値未満のとき、前記第1のスケジューリング方式に変更することを特徴とする請求項6記載の無線通信システム。
- 前記中継方式は、無線通信により中継する中継データに対して誤り訂正及び増幅を行う第1の中継方式、又は前記中継データを増幅する第2の中継方式であることを特徴とする請求項1記載の無線通信システム。
- 前記変更部は、前記端末装置の無線リソース量または前記端末装置の数が閾値以上のとき、前記第1の中継方式に変更し、前記無線リソース量または前記端末装置の数が閾値未満のとき、前記第2の中継方式に変更することを特徴とする請求項8記載の無線通信システム。
- 中継局装置を介して端末装置と無線通信を行う基地局装置において、
前記中継局装置と前記端末装置に対する無線リソースの割り当て方式、又は前記無線リソースの割り当て方式及びスケジューリング方式、又は前記無線リソースの割り当て方式及びスケジューリング方式及び前記中継局装置における中継方式、のうち少なくともいずれかを変更する変更部と、
前記変更部により変更したことを示す変更通知を前記中継装置に送信する送信部とを備え、
少なくとも変更後の前記無線リソースの割り当て方式により割り当てた前記無線リソースを用いて前記中継局装置及び前記端末装置と無線通信を行うことを特徴とする基地局装置。 - 基地局装置及び端末装置と無線通信を行う中継局装置において、
前記中継局装置と前記端末装置に対する無線リソースの割り当て方式、又は前記無線リソースの割り当て方式及びスケジューリング方式、又は前記無線リソースの割り当て方式及びスケジューリング方式及び前記中継局装置における中継方式、のうち少なくともいずれかが変更され、前記変更されたことを示す変更通知を前記基地局装置から受信する受信部を備え、
少なくとも変更後の前記無線リソース割り当て方式に割り当てた又は割り当てられた前記無線リソースを用いて前記基地局装置及び前記端末装置と無線通信を行うことを特徴とする中継局装置。 - 基地局装置と中継局装置を介して無線通信を行う端末装置において、
前記中継局装置と前記端末装置に対する無線リソースの割り当て方式、又は前記無線リソースの割り当て方式及びスケジューリング方式、又は前記無線リソースの割り当て方式及びスケジューリング方式及び前記中継局装置における中継方式、のうち少なくともいずれかが変更され、少なくとも変更後の前記無線リソース割り当て方式により割り当てられた前記端末装置に対する前記無線リソースに関する情報を前記中継局装置から受信する受信部と、
前記無線リソースを用いて前記中継局装置と無線通信を行う通信部と
を備えることを特徴とする端末装置。 - 中継局装置を介して基地局装置と端末装置との間で無線通信を行う無線通信システムにおける無線通信方法であって、
前記基地局装置は、
前記中継局装置と前記端末装置に対する無線リソースの割り当て方式、又は前記無線リソースの割り当て方式及びスケジューリング方式、又は前記無線リソースの割り当て方式及びスケジューリング方式及び前記中継局装置における中継方式、のうち少なくともいずれかを変更し、
前記変更部により変更したことを示す変更通知を前記中継装置に送信し、
前記中継装置は、
前記変更通知を受信し、
前記基地局装置、前記中継局装置、及び前記端末装置は、少なくとも変更後の前記無線リソースの割り当て方式により割り当てた又は割り当てられ前記無線リソースを用いて無線通信を行うことを特徴とする無線通信方法。
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CN200980160461.2A CN102474852B (zh) | 2009-07-15 | 2009-07-15 | 无线通信系统、基站装置、终端装置、中继站装置以及无线通信系统中的无线通信方法 |
KR1020127001038A KR101335876B1 (ko) | 2009-07-15 | 2009-07-15 | 무선 통신 시스템, 기지국 장치, 단말 장치, 중계국 장치, 및 무선 통신 시스템에서의 무선 통신 방법 |
PCT/JP2009/003324 WO2011007388A1 (ja) | 2009-07-15 | 2009-07-15 | 無線通信システム、基地局装置、端末装置、中継局装置、及び無線通信システムにおける無線通信方法 |
EP09847288.9A EP2456271B1 (en) | 2009-07-15 | 2009-07-15 | Radio communication system, base station device, terminal device, relay station device, and radio communication method in radio communication system |
JP2011522624A JP5365692B2 (ja) | 2009-07-15 | 2009-07-15 | 無線通信システム、基地局装置、端末装置、中継局装置、及び無線通信システムにおける無線通信方法 |
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CN102474852A (zh) | 2012-05-23 |
JPWO2011007388A1 (ja) | 2012-12-20 |
CN102474852B (zh) | 2015-11-25 |
US20120094682A1 (en) | 2012-04-19 |
EP2456271B1 (en) | 2016-08-17 |
US8548486B2 (en) | 2013-10-01 |
EP2456271A1 (en) | 2012-05-23 |
EP2456271A4 (en) | 2015-04-15 |
KR20120030142A (ko) | 2012-03-27 |
KR101335876B1 (ko) | 2013-12-02 |
JP5365692B2 (ja) | 2013-12-11 |
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