WO2011125706A1 - 無線中継局装置、無線基地局装置及びリレー周波数割り当て方法 - Google Patents
無線中継局装置、無線基地局装置及びリレー周波数割り当て方法 Download PDFInfo
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- WO2011125706A1 WO2011125706A1 PCT/JP2011/057960 JP2011057960W WO2011125706A1 WO 2011125706 A1 WO2011125706 A1 WO 2011125706A1 JP 2011057960 W JP2011057960 W JP 2011057960W WO 2011125706 A1 WO2011125706 A1 WO 2011125706A1
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- station apparatus
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000002776 aggregation Effects 0.000 claims abstract description 84
- 238000004220 aggregation Methods 0.000 claims abstract description 84
- 230000005540 biological transmission Effects 0.000 claims abstract description 31
- 238000013468 resource allocation Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 abstract description 12
- 238000004891 communication Methods 0.000 abstract description 11
- 239000013256 coordination polymer Substances 0.000 description 11
- 238000012545 processing Methods 0.000 description 11
- 230000011664 signaling Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 5
- 238000013507 mapping Methods 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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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
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- 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
Definitions
- the present invention relates to a radio relay station apparatus, a radio base station apparatus, and a relay frequency allocation method using a relay transmission technique in an LTE-A (Long Term Evolution-Advanced) system.
- LTE-A Long Term Evolution-Advanced
- LTE-A Long Term Evolution-Advanced Generation Partnership Project
- relay technology that relays radio transmission between a radio base station device and a mobile terminal device is used. It is being considered. By using a relay, it is expected that coverage can be expanded efficiently in places where it is difficult to secure a wired backhaul link.
- the layer 1 relay is a relay technology also called a booster or repeater, and is an AF (Amplifier and Forward) type relay technology that amplifies the downlink received RF signal from the radio base station device and transmits it to the mobile terminal device. Similarly, the uplink received RF signal from the mobile terminal apparatus is also amplified in power and transmitted to the radio base apparatus.
- the layer 2 relay is a DF (Decode and Forward) type relay technique in which a downlink received RF signal from a radio base station apparatus is demodulated / decoded, and then encoded / modulated again and transmitted to a mobile terminal apparatus.
- the layer 3 relay decodes the downlink reception RF signal from the radio base station apparatus, and in addition to demodulation / decoding processing, reproduces user data and then performs processing for transmitting user data wirelessly again (secret, user).
- This is a relay technology that performs data division / combination processing, etc., and transmits it to the mobile terminal apparatus after encoding / modulation.
- standardization of the layer 3 relay technology is being promoted from the viewpoint of improving reception characteristics by noise removal, studying standard specifications, and ease of implementation.
- FIG. 1 is a diagram showing an outline of a wireless relay technology using a layer 3 relay.
- the layer 3 relay radio relay station device performs user data reproduction processing, modulation / demodulation, and encoding / decoding processing, and also has a unique cell ID (PCI: Physical Cell ID) different from that of the radio base station device (eNB). ). Accordingly, the mobile terminal apparatus (UE) recognizes the cell B provided by the radio relay station apparatus as a cell different from the cell A provided by the radio base station apparatus.
- PCI Physical Cell ID
- radio relay station apparatus In addition, physical layer control signals such as CQI (Channel Quality Indicator) and HARQ (Hybrid Automatic Repeat reQuest) are terminated at the radio relay station apparatus, so that the radio relay station apparatus is a radio base station as viewed from the mobile terminal apparatus. Recognized as a device. Therefore, a mobile terminal apparatus having only the LTE function can be connected to the radio relay station apparatus.
- CQI Channel Quality Indicator
- HARQ Hybrid Automatic Repeat reQuest
- the backhaul link (Un) between the radio base station apparatus and the radio relay station apparatus and the access link (Uu) between the radio relay station apparatus and the mobile terminal apparatus may be operated at different frequencies or the same frequency.
- the transmission signal wraps around the receiver of the radio relay station apparatus and causes interference. For this reason, as shown in FIG.
- the radio resources (eNB transmission and relay transmission) of the backhaul link and access link are time-division multiplexed (TDM: Time Division Multiplexing) It is necessary to perform control so that transmission and reception are not performed simultaneously in the wireless relay station device (Non-Patent Document 1). For this reason, for example, in the downlink, the radio relay station apparatus cannot transmit the downlink signal to the mobile terminal apparatus while receiving the downlink signal from the radio base station apparatus.
- TDM Time Division Multiplexing
- the present invention has been made in view of the above points, and in a radio communication system using a relay transmission technique, it is possible to optimally control the radio link capacity in the backhaul link and increase the throughput in the access link. It is an object of the present invention to provide a radio relay station apparatus, a radio base station apparatus, and a relay frequency allocation method.
- the radio relay station apparatus includes: a determining unit that determines whether to apply carrier aggregation in an access link from a radio relay station apparatus to a mobile terminal apparatus under the radio relay station apparatus; and when applying carrier aggregation An allocation unit that allocates a frequency band for transmitting a downlink signal in the access link, and a transmission unit that transmits a downlink signal in the access link in the allocated frequency band are provided.
- the radio base station apparatus of the present invention provides a backhaul link from a radio base station apparatus to a mobile terminal apparatus under the radio base station apparatus and / or an access from a radio relay station apparatus to a mobile terminal apparatus under the radio relay station apparatus.
- the relay frequency allocation method of the present invention includes a backhaul link from a radio base station device to a mobile terminal device under the radio base station device and / or an access from a radio relay station device to a mobile terminal device under the radio relay station device. Determining whether to apply carrier aggregation in a link; assigning a frequency band for transmitting a downlink signal in the backhaul link and / or the access link when applying carrier aggregation; and assigned frequency Transmitting a downlink signal in the backhaul link and / or the access link in a band.
- carrier aggregation is performed in a backhaul link from a radio base station apparatus to a mobile terminal apparatus subordinate to the radio base station apparatus and / or an access link from a radio relay station apparatus to a mobile terminal apparatus subordinate to the radio relay station apparatus.
- a frequency band for transmitting a downlink signal in the backhaul link and / or the access link is allocated, and the backhaul link and / or in the allocated frequency band are allocated.
- the radio link capacity in the backhaul link can be optimally controlled and the throughput in the access link can be increased. That.
- FIG. 3 is a diagram for explaining a frequency usage state when mobile communication is performed in the downlink.
- the example shown in FIG. 3 is relatively narrow (here, one is different from the LTE-A system, which is a first mobile communication system having a relatively wide first system band composed of a plurality of component carriers (CC)).
- CC component carriers
- This is a frequency usage state when an LTE system, which is a second mobile communication system having a second system band (consisting of two component carriers) coexists.
- wireless communication is performed with a variable system bandwidth of 100 MHz or less, and in the LTE system, wireless communication is performed with a variable system bandwidth of 20 MHz or less.
- the system band of the LTE-A system is at least one fundamental frequency region (component carrier: CC) having the system band of the LTE system as a unit. In this way, widening a band by combining a plurality of fundamental frequency regions is called carrier aggregation.
- component carrier component carrier
- the present inventors pay attention to this carrier aggregation and apply the carrier aggregation to the radio communication system using the relay transmission technology to optimally control the radio link capacity in the backhaul link and reduce the throughput in the access link. It has been found that it can be increased, and has led to the present invention.
- carrier aggregation is performed in a backhaul link from a radio base station apparatus to a mobile terminal apparatus subordinate to the radio base station apparatus and / or an access link from a radio relay station apparatus to a mobile terminal apparatus subordinate to the radio relay station apparatus.
- a frequency band for transmitting a downlink signal in the backhaul link and / or the access link is allocated, and the backhaul link and / or in the allocated frequency band are allocated.
- a downlink signal in the access link is transmitted.
- the bandwidth (here, component carrier (CC)) f1 and f2 of the backhaul link (Un) and the access link (Uu) bandwidth (here, component carrier (CC)) ) F3 and f4 may be different.
- the bandwidth (CC) f1 and f2 of the backhaul link (Un) and the access link (Uu) bandwidth (CC) f1 and f3 Some may be the same.
- the bandwidth (CC) of the backhaul link (Un) and the access link (Uu) bandwidth (CC) may all be the same.
- the application determination information includes the number of mobile terminal devices, the amount of radio resources allocated to the mobile terminal device, the number of MBSFN subframes used for relay transmission, the buffer status in the radio relay station device, and the mobile terminals under the radio relay station device Apparatus propagation path state and / or propagation state of mobile terminal apparatus under radio base station apparatus, frequency band of backhaul link and / or access link frequency band from radio base station apparatus to radio relay station apparatus, and Examples include the backhaul link link propagation path state and / or the access link propagation path state from the radio base station apparatus to the radio relay station apparatus.
- the radio relay station device determines whether to apply carrier aggregation in the access link according to the number of mobile terminal devices under the radio relay station device.
- the radio base station apparatus may include the number of mobile terminal apparatuses (relay UEs) under the radio relay station apparatus (RN: relay node) and / or the number of mobile terminal apparatuses (macro UEs) under the radio base station apparatus (macro eNB). The number determines whether to apply carrier aggregation on the backhaul link and / or access link.
- the radio link capacity of the backhaul link (or access link) can be increased (increase in user throughput) by applying carrier aggregation, and the number of relay UEs When it decreases, carrier aggregation is not applied, and the radio link capacity of the backhaul link (or access link) can be reduced (decrease in user throughput).
- information indicating the number of relay UEs may be notified from the radio relay station apparatus to the radio base station apparatus by higher layer signaling as necessary. .
- the radio relay station device performs carrier aggregation in the access link according to the radio resource allocation amount of the mobile terminal device under the radio relay station device. Determine whether to apply. Also, the radio base station apparatus determines whether to apply carrier aggregation in the backhaul link and / or access link according to the radio resource allocation amount of the relay UE and / or the radio resource allocation amount of the macro UE.
- the radio link capacity of the backhaul link (or access link) can be increased (increasing user throughput) by applying carrier aggregation.
- the radio link capacity of the backhaul link (or access link) can be reduced (reduction of user throughput).
- information indicating the radio resource amount allocated to the number of relay UEs is transmitted from the radio relay station apparatus to the radio base station apparatus by higher layer signaling as necessary. You may be notified.
- the radio relay station apparatus determines whether to apply carrier aggregation in the access link based on the number of MBSFN subframes in the access link . Also, the radio base station apparatus determines whether to apply carrier aggregation in the backhaul link and / or access link according to the number of MBSFN subframes of the access link and / or the number of MBSFN subframes of the backhaul link.
- the MBSFN subframe is a backhaul (MBSFN: MBMS over a Single Frequency Network) for providing a simultaneous delivery service (MBMS: Multimedia Broadcast Multicast Service) to a large number of users on a single frequency network. It is a subframe.
- the number of MBSFN subframes of the access link is 6, by applying carrier aggregation to the access link, the number of radio subframes that can transmit data to the mobile terminal device can be increased.
- the number of MBSFN subframes is 0, frequency aggregation can be efficiently used without applying carrier aggregation.
- the application of carrier aggregation is controlled in the radio base station apparatus, information indicating the number of MBSFN subframes of the access link is notified from the radio relay station apparatus to the radio base station apparatus by higher layer signaling as necessary. May be.
- the radio relay station device determines whether to apply carrier aggregation in the access link based on the buffer status in the radio relay station device. Also, the radio base station apparatus determines whether to apply carrier aggregation in the backhaul link and / or access link according to the buffer state in the radio relay station apparatus.
- the buffer of the radio relay station apparatus when the buffer of the radio relay station apparatus is close to empty (empty), by applying carrier aggregation to the backhaul link, more radio resources can be allocated to the radio relay apparatus.
- the buffer of the station device When the buffer of the station device is close to the overflow state, carrier aggregation is not applied to the backhaul link, and the radio resource allocation amount to the radio relay station device can be limited.
- the buffer of the radio relay station apparatus when the buffer of the radio relay station apparatus is in a state close to the overflow state, the buffer of the radio relay station apparatus can be consumed more quickly by applying carrier aggregation to the access link, and the radio relay station When the buffer of the station apparatus is near empty (empty), carrier aggregation is not applied to the backhaul link, and the radio resource allocation amount to the mobile terminal apparatus can be limited.
- the buffer of the radio relay station apparatus when the buffer of the radio relay station apparatus considers the overflow state, more optimal (efficient) relay transmission can be performed.
- information indicating a buffer state may be notified from the radio relay station apparatus to the radio base station apparatus by higher layer signaling.
- the radio relay station apparatus performs carrier aggregation in the access link according to the propagation path state of the relay UE. Decide whether to apply. Also, the radio base station apparatus determines whether to apply carrier aggregation in the backhaul link and / or access link according to the propagation path state of the relay UE and / or the propagation path state of the macro UE.
- the propagation path state of the relay UE and / or the propagation path state (reception quality) of the macro UE when the propagation path state of the relay UE and / or the propagation path state (reception quality) of the macro UE is low, more radio resources are allocated to the radio relay station apparatus and / or the mobile terminal apparatus by applying carrier aggregation.
- carrier aggregation When the propagation path state of the relay UE and / or the propagation path state (reception quality) of the macro UE is high, carrier aggregation is not suitable and frequency resources can be used efficiently.
- more optimal (efficient) relay transmission can be performed.
- information indicating the propagation path state of the relay UE is notified from the radio relay station apparatus to the radio base station apparatus by higher layer signaling as necessary. May be.
- the radio relay station apparatus applies carrier aggregation in the access link according to the frequency band of the access link. Decide whether or not. Also, the radio base station apparatus determines whether to apply carrier aggregation in the backhaul link and / or access link according to the frequency band of the backhaul link and / or the frequency band of the access link.
- the frequency band of the backhaul link and / or the frequency band of the access link is narrow, by applying carrier aggregation to the backhaul link and / or the access link, more radio relay station apparatuses and / or mobile terminal apparatuses are used.
- the frequency resources can be efficiently used without applying carrier aggregation. In this way, by considering the frequency band of the backhaul link and / or the frequency band of the access link, more optimal (efficient) relay transmission can be performed.
- information indicating the frequency band of the access link is notified from the radio relay station apparatus to the radio base station apparatus by higher layer signaling as necessary. Also good.
- the radio relay station apparatus performs carrier aggregation in the access link according to the propagation path state of the access link. Decide whether to apply. Also, the radio base station apparatus determines whether to apply carrier aggregation in the backhaul link and / or access link according to the propagation path state of the backhaul link and / or the propagation path state of the access link.
- the propagation path state of the backhaul link and / or the propagation path state of the access link is low, more radio resources can be allocated to the radio relay station apparatus and / or the mobile terminal apparatus by applying carrier aggregation.
- the propagation path state of the backhaul link and / or the propagation path state of the access link is high, it is possible to efficiently use frequency resources without applying carrier aggregation.
- more optimal (efficient) relay transmission can be performed.
- the application of carrier aggregation is controlled in the radio base station apparatus, information indicating the propagation path state of the access link is notified from the radio relay station apparatus to the radio base station apparatus by higher layer signaling as necessary. May be.
- FIG. 6 is a block diagram showing a schematic configuration of the radio base station apparatus (radio relay station apparatus) according to the embodiment of the present invention.
- the radio base station apparatus (radio relay station apparatus) illustrated in FIG. 6 includes a transmission unit and a reception unit. Here, only the transmission unit side will be described.
- the radio base station apparatus shown in FIG. 6 includes a data signal generation unit 101, a carrier aggregation determination unit 102, a CC allocation unit 103, a signal processing unit 104, an IFFT (Inverse Fast Fourier Transform) unit 105, and a CP (Cyclic). Prefix) is mainly composed of an insertion portion 106.
- the data signal generation unit 101 generates a downlink data signal to be transmitted to the relay node and a downlink data signal to be transmitted to the macro UE.
- the data signal generation unit 101 outputs these downlink data signals to the signal processing unit 104.
- the carrier aggregation determination unit 102 determines whether to apply carrier aggregation in the backhaul link and / or access link.
- the carrier aggregation determination unit 102 determines whether to apply carrier aggregation on the backhaul link and / or access link based on application determination information that is information for determining application of carrier aggregation. Note that the carrier aggregation determination unit 102 in the radio relay station apparatus determines whether to apply carrier aggregation in the access link.
- the carrier aggregation determination unit 102 outputs a control signal to that effect to the CC allocation unit 103.
- the application determination information includes the number of mobile terminal devices, the amount of radio resources allocated to the mobile terminal devices, the number of MBSFN subframes used for relay transmission, the buffer status in the radio relay station device, the relay UE The propagation path state and / or the propagation state of the macro UE, the frequency band of the backhaul link link and / or the frequency band of the access link, and the backhaul link link propagation path state and / or the propagation path state of the access link. it can.
- the CC allocating unit 103 allocates a frequency band (for example, CC) for transmitting a downlink signal in the backhaul link and / or access link when applying carrier aggregation. That is, in the radio base station apparatus, frequency bands f1 and f2 are assigned in the case shown in FIGS. 4 and 5, and in the radio relay station apparatus, frequency bands f3 and f4 are assigned in the case shown in FIG. In the case shown in FIG. 5, frequency bands f1 and f3 are allocated. The CC allocation unit 103 outputs such frequency allocation information to each signal processing unit 104.
- a frequency band for example, CC
- a plurality of signal processing units 104 (here, for each CC (CC # 1 to CC # M)) are provided, and each includes a channel encoding unit 1041, a modulation unit 1042, a mapping unit 1043, and a reference signal generation unit 1044. Including.
- the channel coding unit 1041 channel-codes the downlink data signal.
- Channel coding section 1041 outputs the data signal after channel coding to modulation section 1042.
- Modulation section 1042 modulates the data after channel coding.
- Modulation section 1042 outputs the data signal after data modulation to mapping section 1043.
- the mapping unit 1043 maps the frequency domain signal to the subcarrier based on the resource allocation information.
- Mapping section 1043 outputs the mapped data signal to IFFT section 105.
- the reference signal generation unit 1044 generates a reference signal and outputs the reference signal to the IFFT unit 105.
- the IFFT unit 105 performs IFFT on the data signal and the reference signal and converts them into a time domain signal.
- IFFT section 105 outputs the signal after IFFT to CP insertion section 106.
- CP insertion section 106 inserts a CP into the signal after IFFT.
- the signal in which the CP is inserted is transmitted on the downlink in the backhaul link (access link) in the allocated frequency band.
- FIG. 7 is a block diagram showing a schematic configuration of the mobile terminal apparatus according to the embodiment of the present invention.
- the mobile terminal apparatus shown in FIG. 7 includes a transmission unit and a reception unit. Here, only the receiving unit side will be described.
- the receiving unit of the mobile terminal apparatus shown in FIG. 7 includes a CP removing unit 201, an FFT (Fast Fourier Transform) unit 202, a demapping unit 203, and a downlink transmission data demodulating unit 204.
- CP removing section 201 removes the CP from the received signal.
- CP removing section 201 outputs the signal after CP removal to FFT section 202.
- the FFT unit 202 performs FFT processing on the signal after CP removal.
- the FFT unit 202 outputs the signal after the FFT to the demapping unit 203.
- Demapping section 203 demaps the signal after FFT, and outputs the demapped signal to downlink transmission data demodulation section 204.
- the carrier aggregation determination unit 102 of the wireless base station device determines whether to apply carrier aggregation on the backhaul link (or access link). decide. In this case, whether to apply carrier aggregation in the backhaul link (or access link) is determined based on application determination information that is information for determining the application of carrier aggregation.
- the CC allocation unit 103 allocates a frequency band for transmitting a downlink signal in the backhaul link (or access link) when applying carrier aggregation. And the downlink signal in a backhaul link (or access link) is transmitted by the allocated frequency band.
- the present invention it is determined whether to apply carrier aggregation in the backhaul link and / or access link, and when applying carrier aggregation, downlink signals in the backhaul link and / or access link are determined. And a downlink signal in the backhaul link and / or the access link is transmitted in the allocated frequency band. Therefore, in a radio communication system using the relay transmission technology, radio in the backhaul link is transmitted.
- the link capacity can be optimally controlled and the throughput in the access link can be increased.
- the present invention is useful for a radio relay station apparatus, a radio base station apparatus, and a relay frequency allocation method of the LTE-A system.
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Abstract
Description
LTE-Aシステムにおいては、LTEシステムとのバックワードコンパチビリティを保つことができるように、図3に示すような周波数利用帯域を採る。図3は、下りリンクで移動通信が行われる際の周波数使用状態を説明するための図である。図3に示す例は、複数のコンポーネントキャリア(CC)で構成される相対的に広い第1システム帯域を持つ第1移動通信システムであるLTE-Aシステムと、相対的に狭い(ここでは、一つのコンポーネントキャリアで構成される)第2システム帯域を持つ第2移動通信システムであるLTEシステムが併存する場合の周波数使用状態である。LTE-Aシステムにおいては、例えば、100MHz以下の可変のシステム帯域幅で無線通信し、LTEシステムにおいては、20MHz以下の可変のシステム帯域幅で無線通信する。LTE-Aシステムのシステム帯域は、LTEシステムのシステム帯域を一単位とする少なくとも一つの基本周波数領域(コンポーネントキャリア:CC)となっている。このように複数の基本周波数領域を一体として広帯域化することをキャリアアグリゲーションという。
この場合においては、無線中継局装置は、無線中継局装置配下の移動端末装置の数により、アクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する。また、無線基地局装置は、無線中継局装置(RN:リレーノード)配下の移動端末装置(リレーUE)の数及び/又は無線基地局装置(マクロeNB)配下の移動端末装置(マクロUE)の数により、バックホールリンク及び/又はアクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する。
この場合においては、無線中継局装置は、無線中継局装置配下の移動端末装置の無線リソース割り当て量により、アクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する。また、無線基地局装置は、リレーUEの無線リソース割り当て量及び/又はマクロUEの無線リソース割り当て量数により、バックホールリンク及び/又はアクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する。
この場合においては、無線中継局装置は、アクセスリンクのMBSFNサブフレーム数により、アクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する。また、無線基地局装置は、アクセスリンクのMBSFNサブフレーム数及び/又はバックホールリンクのMBSFNサブフレーム数により、バックホールリンク及び/又はアクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する。ここで、MBSFNサブフレームとは、放送型コンテンツの多数ユーザへの同時配信サービス(MBMS:Multimedia Broadcast Multicast Service)を単一周波数ネットワークで提供するためのバックホール(MBSFN:MBMS over a Single Frequency Network)サブフレームである。
この場合においては、無線中継局装置は、無線中継局装置におけるバッファ状態により、アクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する。また、無線基地局装置は、無線中継局装置におけるバッファ状態により、バックホールリンク及び/又はアクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する。
この場合においては、無線中継局装置は、リレーUEの伝搬路状態により、アクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する。また、無線基地局装置は、リレーUEの伝搬路状態及び/又はマクロUEの伝搬路状態により、バックホールリンク及び/又はアクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する。
この場合においては、無線中継局装置は、アクセスリンクの周波数帯域により、アクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する。また、無線基地局装置は、バックホールリンクの周波数帯域及び/又はアクセスリンクの周波数帯域により、バックホールリンク及び/又はアクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する。
この場合においては、無線中継局装置は、アクセスリンクの伝搬路状態により、アクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する。また、無線基地局装置は、バックホールリンクの伝搬路状態及び/又はアクセスリンクの伝搬路状態により、バックホールリンク及び/又はアクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する。
Claims (12)
- 無線中継局装置から前記無線中継局装置配下の移動端末装置までのアクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する決定手段と、キャリアアグリゲーションを適用する際に前記アクセスリンクにおける下りリンク信号を送信する周波数帯域を割り当てる割り当て手段と、割り当てられた周波数帯域で前記アクセスリンクにおける下りリンク信号を送信する送信手段と、を具備することを特徴とする無線中継局装置。
- 前記決定手段は、キャリアアグリゲーションの適用を判断するための情報である適用判断情報に基づいて、前記アクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定することを特徴とする請求項1記載の無線中継局装置。
- 前記適用判断情報は、前記無線中継局装置配下の移動端末装置の数であることを特徴とする請求項2記載の無線中継局装置。
- 前記適用判断情報は、前記無線中継局装置配下の移動端末装置への無線リソース割り当て量であることを特徴とする請求項2記載の無線中継局装置。
- 前記適用判断情報は、リレー伝送に用いるMBSFNサブフレーム数であることを特徴とする請求項2記載の無線中継局装置。
- 前記適用判断情報は、前記無線中継局装置におけるバッファ状態であることを特徴とする請求項2記載の無線中継局装置。
- 前記適用判断情報は、前記無線中継局装置配下の移動端末装置の伝搬路状態及び/又は無線基地局装置配下の移動端末装置の伝搬路状態であることを特徴とする請求項2記載の無線中継局装置。
- 前記適用判断情報は、無線基地局装置から前記無線中継局装置までのバックホールリンクリンクの周波数帯域及び/又は前記アクセスリンクの周波数帯域であることを特徴とする請求項2記載の無線中継局装置。
- 前記適用判断情報は、無線基地局装置から前記無線中継局装置までのバックホールリンクリンク伝搬路状態及び/又は前記アクセスリンクの伝搬路状態であることを特徴とする請求項2記載の無線中継局装置。
- 無線基地局装置から前記無線基地局装置配下の移動端末装置までのバックホールリンク及び/又は無線中継局装置から前記無線中継局装置配下の移動端末装置までのアクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する決定手段と、キャリアアグリゲーションを適用する際に前記バックホールリンク及び/又は前記アクセスリンクにおける下りリンク信号を送信する周波数帯域を割り当てる割り当て手段と、割り当てられた周波数帯域で前記バックホールリンク及び/又は前記アクセスリンクにおける下りリンク信号を送信する送信手段と、を具備することを特徴とする無線基地局装置。
- 無線基地局装置から前記無線基地局装置配下の移動端末装置までのバックホールリンク及び/又は無線中継局装置から前記無線中継局装置配下の移動端末装置までのアクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定する工程と、キャリアアグリゲーションを適用する際に前記バックホールリンク及び/又は前記アクセスリンクにおける下りリンク信号を送信する周波数帯域を割り当てる工程と、割り当てられた周波数帯域で前記バックホールリンク及び/又は前記アクセスリンクにおける下りリンク信号を送信する工程と、を具備することを特徴とするリレー周波数割り当て方法。
- キャリアアグリゲーションの適用を判断するための情報である適用判断情報に基づいて、前記バックホールリンク及び/又は前記アクセスリンクにおいてキャリアアグリゲーションを適用するかどうかを決定することを特徴とする請求項11記載のリレー周波数割り当て方法。
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EP11765606A EP2557833A1 (en) | 2010-04-05 | 2011-03-30 | Wireless relay station device, wireless base station device, and relay frequency allocation method |
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US20130070664A1 (en) | 2013-03-21 |
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