WO2017126518A1 - 無線基地局及び通信制御方法 - Google Patents
無線基地局及び通信制御方法 Download PDFInfo
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- WO2017126518A1 WO2017126518A1 PCT/JP2017/001461 JP2017001461W WO2017126518A1 WO 2017126518 A1 WO2017126518 A1 WO 2017126518A1 JP 2017001461 W JP2017001461 W JP 2017001461W WO 2017126518 A1 WO2017126518 A1 WO 2017126518A1
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- delivery confirmation
- central aggregation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1896—ARQ related signaling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0097—Relays
Definitions
- the present invention relates to a radio base station that includes a central aggregation device and an overhanging device and performs radio communication with a user device, and a communication control method.
- LTE including LTE-Advanced LTE-Advanced
- LTE Long Term Evolution
- 5G 5th generation mobile mobile communication systems
- the overhanging device includes a wireless unit (RF unit) such as a PA (Power Amplifier) / LNA (Low Noise Amplifier), a wireless transmission / reception module, and a modulation / demodulation module.
- RF unit wireless unit
- PA Power Amplifier
- LNA Low Noise Amplifier
- central concentrating device and the overhanging device are connected by a wired transmission line called a front hall.
- a front hall As an interface between such a central aggregation device and a projecting device, for example, Common Public Radio Interface (CPRI) is known.
- CPRI Common Public Radio Interface
- 3GPP RWS-150051 (3GPP RAN shop on 5G), “5G Vision for 2020 and Beyond”, 3GPP, September 2015
- the wireless physical layer function that has been implemented in the central aggregation device is implemented in the extension device, there are the following problems. That is, functions of higher layers (such as layer 2) such as the MAC scheduler are implemented in the central aggregation device as before. Therefore, for example, in order for the MAC scheduler to perform appropriate HARQ (Hybrid Automatic Repeat reQuest) retransmission control of a downlink signal, a reception response signal (also referred to as a radio communication terminal or a mobile station) transmitted from a user apparatus ( Cooperation with the radio physical layer that detects (ACK, NACK) is indispensable.
- HARQ Hybrid Automatic Repeat reQuest
- the radio physical layer and the upper layer of the radio physical layer Cooperation with layers becomes difficult.
- An object of the present invention is to provide a radio base station and a communication control method that can realize reliable HARQ retransmission control.
- a radio base station includes a central aggregation device and an extension device, and is a radio base station that performs radio communication with a user device, wherein the extension device receives a downlink signal.
- a transmission unit that transmits the delivery confirmation information to the central aggregation device, and the delivery confirmation information includes information indicating whether or not the reception response signal is successfully received.
- a communication control method is a communication control method in a radio base station that includes a central aggregation device and an extension device, and performs radio communication with a user device
- the extension device includes: Receiving a reception response signal for notifying whether or not the downlink signal has been successfully received from the user apparatus, and based on the reception response signal, the central aggregation device performs retransmission control of the downlink signal.
- a generation step of generating delivery confirmation information for performing and a transmission step of transmitting the delivery confirmation information to the central aggregation device wherein the central aggregation device obtains scheduling information of the downlink signal from the extension A transmission step of transmitting to the device is performed, and the delivery confirmation information includes information indicating whether or not the reception response signal is successfully received.
- FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10.
- FIG. 2 is an overall block configuration diagram of the wireless communication system 10.
- FIG. 3 is a functional block configuration diagram of the central aggregation device 210.
- FIG. 4 is a functional block configuration diagram of the overhanging device 220.
- FIG. 5 is a diagram showing an outline of the operation of the wireless communication system 10.
- FIG. 6 is a sequence diagram illustrating an operation example of the wireless communication system 10.
- FIG. 7 is a diagram illustrating an example of a format of delivery confirmation information.
- FIG. 8 is a diagram illustrating an example of a correspondence table of CC and ACK / NACK.
- FIG. 9 is a diagram illustrating a specific example (case 1) of the delivery confirmation information.
- FIG. 10 is a diagram illustrating a specific example (case 2) of the delivery confirmation information.
- FIG. 11 is a diagram illustrating a specific example (case 3) of the delivery confirmation information.
- FIG. 12 is a diagram illustrating a specific example (case 4) of the delivery confirmation information.
- FIG. 13 is a diagram illustrating a specific example of protocol stacks that the central aggregation device and the overhanging device can have.
- FIG. 1 is an overall schematic configuration diagram of a radio communication system 10 according to the present embodiment.
- the radio communication system 10 is a radio communication system according to Long Term Evolution (LTE) and 5G, which is a successor system of LTE.
- LTE Long Term Evolution
- 5G 5th Generationан ⁇
- LTE (including LTE-Advanced) is appropriately referred to as “4G” from the viewpoint of corresponding to 5G.
- 4G the configuration of the wireless communication system 10 immediately after 5G is introduced is assumed, and 5G realizes LTE assisted operation that complements 4G.
- the radio communication system 10 includes a core network 20, a radio base station 100, a radio base station 200, and a user device 300.
- the core network 20 is also called Evolved Packet Core (EPC), and includes a mobility management entity (MME), a serving gateway (S-GW), a PDN gateway (P-GW), and the like.
- EPC Evolved Packet Core
- MME mobility management entity
- S-GW serving gateway
- P-GW PDN gateway
- the radio base station 100 is a radio base station according to 4G and is also called eNodeB.
- the radio base station 100 is connected to devices (nodes) constituting the core network 20 via the S1-MME or S1-U interface.
- the radio base station 200 is a radio base station according to 5G.
- the radio base station 200 is connected to the radio base station 100 via an X2 interface (referred to here as X2-AP ′ and X2-U ′ for convenience).
- User apparatus 300 can execute radio communication with radio base station 100 and radio base station 200.
- User apparatus 300 may be referred to as a wireless communication terminal or a mobile station.
- the radio base station 200 and the user apparatus 300 control a radio signal transmitted from a plurality of antenna elements, thereby generating Massive ⁇ ⁇ MIMO that generates a beam with higher directivity and carrier aggregation using a plurality of component carriers (CC) ( CA), dual connectivity (DC) that simultaneously transmits component carriers between a plurality of radio base stations and the user apparatus 300, and the like.
- CC component carriers
- DC dual connectivity
- FIG. 2 is an overall block configuration diagram of the wireless communication system 10.
- the radio base station 100 includes a central aggregation device 110 and an extension device 120.
- the radio base station 200 includes a central aggregation device 210 and an extension device 220.
- the radio base station 100 and the radio base station 200 may include devices other than the central aggregation device and the overhanging device.
- the central aggregation device 110 has a radio physical layer (L1), a medium access control layer (MAC), a radio link control layer (RLC), and a packet data convergence protocol layer (PDCP). Further, the central aggregation device 110 has a radio resource control layer (RRC) as an upper layer of PDCP.
- L1 radio physical layer
- MAC medium access control layer
- RLC radio link control layer
- PDCP packet data convergence protocol layer
- RRC radio resource control layer
- the overhanging device 120 can be placed remotely from the installation location of the central aggregation device 110.
- the overhanging device 120 includes a wireless unit (RF) such as a PA (Power Amplifier) / LNA (Low Noise Amplifier), a wireless transmission / reception module, and a modulation / demodulation module.
- RF wireless unit
- PA Power Amplifier
- LNA Low Noise Amplifier
- the central aggregation device 110 is also called a digital processing unit (Digital Unit (DU)), and the overhanging device 120 is also called a wireless processing unit (Radio Unit (RU)).
- the central aggregation device 110 and the overhanging device 120 are connected by a wired transmission line called a front hall.
- a front hall As an interface between the central aggregation device 110 and the extension device 120, for example, Common Public Radio Interface (CPRI) is used.
- CPRI Common Public Radio Interface
- the central aggregation device 210 and the overhanging device 220 correspond to the central aggregation device 110 and the overhanging device 120, respectively, but have different layer configurations.
- the central aggregation device 210 has a medium access control layer (MAC) and a radio link control layer (RLC).
- the overhang device 220 includes a radio physical layer (L1) and a radio unit (RF).
- the central aggregation device 210 is connected to the central aggregation device 110 via the X2-AP ′ and X2-U ′ interfaces.
- FIG. 3 is a functional block configuration diagram of the 5G central aggregation device 210.
- the central aggregation device 210 includes a schedule processing unit 211, a retransmission control unit 212, an information transmission unit 213, an information reception unit 215, and an X2IF unit 217.
- each functional block of the central aggregation device 210 is realized by hardware elements such as a processor (including a memory), a functional module (such as a network IF), and a power source.
- the schedule processing unit 211 performs schedule processing for determining which radio resource is allocated to which user apparatus 300. Specifically, the schedule processing unit 211 generates scheduling information (radio resource allocation information) for the user device 300 selected by the schedule processing.
- the scheduling information includes, for example, the number of RB (Resource Block), TBS (Transport Size), modulation scheme, number of transmission ranks, and the like.
- the retransmission control unit 212 performs HARQ (Hybrid Automatic Repeat reQuest) retransmission control of the downlink signal using the delivery confirmation information transmitted from the extension device 220.
- HARQ is a technique for guaranteeing an error in a received signal by using both an error correction code and retransmission.
- the information transmission unit 213 transmits scheduling information and a transmission data signal necessary for the extension device 220 to transmit a downlink signal to the extension device 220.
- the downlink signal is transmitted to the user apparatus 300 using a radio resource such as PDCCH (Physical Downlink Control Channel, downlink control channel) or PDSCH (Physical Downlink Shared Channel, downlink shared channel). Therefore, the scheduling information includes PDCCH or PDSCH allocation information and other accompanying information.
- the information receiving unit 215 receives the delivery confirmation information transmitted from the overhanging device 220 and outputs it to the retransmission control unit 212.
- the X2IF unit 217 provides an interface for realizing communication with the central aggregation device 110.
- the X2IF unit 217 is an interface that directly connects the central aggregation device 110 and the central aggregation device 210 using MAC and RLC, and is preferably an existing open interface. Transmission / reception data of the user apparatus 300 is relayed to the radio base station 100 via the X2IF unit 217.
- FIG. 4 is a functional block configuration diagram of the overhanging device 220. As illustrated in FIG. 4, the overhanging device 220 includes an information receiving unit 221, a wireless communication unit 223, a delivery confirmation information generation unit 224, an information transmission unit 225, and a communication setting unit 226.
- each functional block of the overhanging device 220 is realized by hardware elements such as a power source, a functional module (such as a network IF), a wireless transmission / reception module, PA / LAN, and DUX.
- the information reception unit 221 receives scheduling information and transmission data signals necessary for transmission of downlink signals from the central aggregation device 210.
- the radio communication unit 223 uses the scheduling information received from the central aggregation device 210 to code data to be transmitted, performs RF (Radio Frequency) processing, and transmits a downlink signal to the user apparatus 300 using PDCCH or PDSCH. To do. Also, the radio communication unit 223 receives a reception response signal (ACK, NACK) for the transmitted downlink signal (PDSCH signal) from the user apparatus 300.
- RF Radio Frequency
- the delivery confirmation information generation unit 224 generates delivery confirmation information using the reception response signal received from the user device 300.
- the delivery confirmation information will be described later.
- the information transmission unit 225 transmits the delivery confirmation information generated by the delivery confirmation information generation unit 224 to the central aggregation device 210.
- the communication setting unit 226 configures or sets predetermined information (for example, system parameters, UE individual setting information, etc.) in the extension device 220 so that signals can be transmitted to and received from the user device 300. Specifically, the communication setting unit 226 sets stationary information (eg, frequency, bandwidth, cell ID, etc.) using information notified from the central aggregation device 210 at the time of cell setup. In addition, dynamically changing information (for example, information related to broadcast information) and setting information for each user device are set as needed.
- predetermined information for example, system parameters, UE individual setting information, etc.
- FIG. 5 is a diagram showing an overview of downlink signal transmission processing by the central aggregation device 210 and the overhanging device 220.
- the central aggregation device 210 transmits scheduling information necessary for transmission of the downlink signal and a transmission data signal to the extension device 220.
- the extension device 220 transmits a downlink signal to the user device 300 using PDCCH or PDSCH using the scheduling information.
- the user apparatus 300 transmits a reception response signal (ACK, NACK) for the downlink signal to the extension apparatus 220.
- the overhanging device 220 generates delivery confirmation information based on the reception response signal and transmits it to the central aggregation device 210.
- the central aggregation device 210 performs HARQ retransmission control of the downlink signal using the received delivery confirmation information.
- FIG. 6 is a sequence diagram specifically illustrating downlink signal transmission processing by the central aggregation device 210 and the overhanging device 220.
- the overhang device 220 performs communication settings for the user device 300. Specifically, the extension device 220 presets information necessary for transmitting a downlink signal to the user device 300 and information necessary for receiving an uplink signal transmitted by the user device 300. .
- the central aggregation device 210 performs scheduling (assignment) of downlink signal radio resources (PDSCH, PDCCH) to the user device 300.
- the central aggregation device 210 transmits scheduling information necessary for transmission of the downlink signal and a transmission data signal to the extension device 220.
- the overhanging device 220 allocates a downlink signal to a radio resource using the scheduling information transmitted from the central aggregation device 210, and transmits it to the user device 300.
- the user apparatus 300 transmits a reception response signal (ACK or NACK (hereinafter “ACK / NACK”)) notifying whether or not the downlink signal has been successfully received to the extension apparatus 220.
- ACK Acknowledgement
- NACK Negative Acknowledgment
- the extension apparatus 220 may not detect the ACK / NACK signal and may determine DTX. .
- ACK / NACK is transmitted using an uplink channel (PUSCH, PUCCH).
- the user apparatus 300 transmits ACK / NACK using PUSCH when PUSCH is allocated at the transmission timing of ACK / NACK.
- the overhanging device 220 transmits the UL Scheduling Grant of the PUSCH to the user device 300 as an uplink signal of the PDCCH. Therefore, the overhanging device 220 knows that it receives a PUSCH uplink signal (here, an ACK / NACK reception response signal).
- PUCCH Physical Uplink Control Channel
- the central aggregation device 210 uses information about individual radio resources in advance as the individual setting information (parameter) of the user apparatus 300 that transmits the downlink signal. 220 is notified. Thereby, the overhanging device 220 sets and holds information on individual radio resources in S11.
- the extension device 220 has information necessary for receiving PDSCH transmission and PUCCH (for example, transmission mode, duplex mode, and carrier aggregation state) as information necessary for receiving ACK / NACK transmitted from the user device 300. Etc.) is stored as individual setting information of the user apparatus 300.
- Information regarding these individual radio resources and information necessary for PDSCH transmission and PUCCH reception are notified from the central aggregation device 210 to the extension device 220 as setup information when the user device 300 is connected, The central aggregation device 210 is also notified to the overhanging device 220 at the timing notified to the user device 300 every time the resource is changed.
- a plurality of overhanging devices 220 may be used.
- the first overhanging device among the plurality of overhanging devices 220 is, for example, a primary overhanging device that transmits a signal via a subordinate primary cell (PCell).
- the overhanging device is a secondary overhanging device that transmits a signal via a subordinate secondary cell (SCell).
- the first extension device changes its PUCCH resource, the number of received bits, and the like depending on the presence / absence of signal transmission in the secondary cell under the second extension device (other extension device).
- the central aggregation device 210 when performing carrier aggregation using a plurality of overhanging devices 220, performs scheduling information under the control of the second overhanging device (other overhanging devices) with respect to the first overhanging device. (Radio resource allocation information) is notified in S13.
- the overhanging device 220 generates delivery confirmation information based on the reception response signal received from the user device 300.
- the delivery confirmation information is information necessary for the central aggregation device 210 to perform HARQ retransmission control, and is information for transmitting the ACK / NACK transmitted from the user device 300 to the central aggregation device 210.
- the delivery confirmation information includes at least “identification information”, “ACK / NACK information”, and “PDSCH time timing”. “ACK / NACK information” is information indicating whether or not the downlink signal has been successfully received in the reception response signal (ACK / NACK).
- PDSCH time timing is the PDSCH time timing (for example, HFN (Hyper Frame Number), SFN (System Frame Number), subframe number, etc.) linked to the ACK / NACK information to be transmitted in the delivery confirmation information. .
- the “PDSCH time timing” may be set in the entire header field of the delivery confirmation information.
- the “PDSCH time timing” may be a repetitive format for each subframe. That is, a subheader field may be provided for each subframe, and the “PDSCH time timing” of each subframe may be set in the subheader field.
- FIG. 7 is a diagram showing an example of the format of delivery confirmation information.
- the delivery confirmation information shown in the figure includes a “header field”, “ACK / NACK header field”, “identification information”, and “ACK / NACK information”.
- “identification information” and “ACK / NACK information” are set in association with each other, and a plurality of sets of “identification information” and “ACK / NACK information” are repeatedly set.
- Header field is an area in which information is set to indicate what kind of signal the delivery confirmation information signal is.
- the header field includes predetermined information indicating ACK / NACK information for performing downlink HARQ retransmission control.
- ACK / NACK header field is an area in which information indicating the configuration of subsequent ACK / NACK information is set.
- the “ACK / NACK header field” includes the number of pieces of identification information to be multiplexed (for example, the number of user apparatuses 300), the bit length, and the like.
- the status of the user device 300 includes, for example, the number of transmission CW (codeword), presence / absence of carrier aggregation, multiplexing scheme (TDD (Time Division Duplex) / FDD (Frequency Division Duplex)), ACK bundling / multiplexing, and the like.
- the bit length information may be omitted by preparing the maximum possible bit field.
- the bit length may be set to the total value of the bit length of each user apparatus 300 in the “ACK / NACK header field”. Or it is good also as providing a subheader field with respect to the ACK / NACK information of each user apparatus 300, and setting the bit length of each user apparatus 300 to the said subheader field. That is, a subheader field may be provided for each “identification information”, and the bit length of each user apparatus 300 may be set in the subheader field.
- Identification information is identification information for identifying the user device 300. Specifically, this is information indicating to which PDSCH the corresponding ACK / NACK information corresponding to the subsequent ACK / NACK information is. Any of the following may be used as the identification information.
- C-RNTI Cell-Radio Network Temporary Identity
- SPS Semi-Persistent Scheduling
- C-RNTI Cell-Radio Network Temporary Identity
- CCE Control Channel Element index of the assigned PDCCH
- ACK / NACK needs to return information on multiple subframes together, so refer to the last related PDCCH, etc.
- PUCCH resource index In SPS, there is no PDCCH, so it is necessary to use a PUCCH resource index.
- index 1 is assigned to the user device (1), It is conceivable to assign index 2 to the user device (2) and index 3 to the user device (3).
- identity information may be omitted.
- the identification information and the ACK / NACK information are associated only in the case of NACK (or DTX: no response). Then, the number of bits of the delivery confirmation information may be reduced by setting the delivery confirmation information and transmitting the information.
- ACK / NACK information is information indicating whether or not reception of the downlink signal in the reception response signal (ACK / NACK) is successful. Specifically, the “ACK / NACK information” is information regarding delivery confirmation for the PDSCH transmitted to the user apparatus 300, and is information regarding the reception status of the reception response signal received using the PUSCH or PUCCH.
- ACK / NACK information for example, “ACK” or “NACK” may be used as information indicating whether reception is successful, or a predetermined code indicating whether reception is successful. A value, an index value, or the like may be used.
- the “ACK / NACK information” is not only binary information of information indicating successful reception (for example, ACK) and information indicating unsuccessful reception (for example, NACK), but also information indicating no response (for example, DTX) may also be used as ternary information. DTX indicates that neither ACK nor NACK can be received when PUSCH or PUCCH transmitted from user apparatus 300 cannot be detected, that is, no response from user apparatus 300.
- the arrangement order of the “ACK / NACK information” may be the information bits obtained by decoding PUCCH or PUSCH, or may be rearranged in a specific order.
- “ACK / NACK information” may be rearranged in the order of the CCE index values (ascending order, descending order).
- correspondence tables for each CC (Component Carrier) and each CW (codeword) may be prepared in advance, and only the index may be notified. . That is, as shown in FIG. 8, a correspondence table in which an ACK / NACK pattern in each CC is set may be prepared, and only the corresponding index (index value) may be notified. In this way, the number of bits of the delivery confirmation information can be reduced by notifying only one index value to a plurality of CCs. In the example shown in FIG. 8, only ACK / NACK is provided, but a correspondence table including DTX may be prepared.
- ACK / NACK information instead of setting all ACK / NACKs transmitted by the user apparatus 300 to “ACK / NACK information”, only the result of collecting the received ACK / NACKs for each specific group is displayed as “ACK / NACK information”. May be set to reduce the number of bits of the delivery confirmation information.
- the specific group include all TB (Transport Block) units, CC units, CW units, and the like.
- the extension device 220 displays an invalid value or DTX as “until ACK / NACK is detected”.
- ACK / NACK information "may be set. Further, the extension device 220 may not generate and transmit the delivery confirmation information until ACK / NACK is detected.
- the overhanging device 220 transmits the delivery confirmation information generated in S16 to the central aggregation device 210.
- the central aggregation device 210 receives the delivery confirmation information transmitted from the extension device 220, and performs downlink HARQ retransmission control using the delivery confirmation information.
- 9 to 12 are diagrams showing specific examples of delivery confirmation information.
- the delivery confirmation information (Case 1) shown in FIG. 9 is an example using C-RNTI as identification information.
- the ACK / NACK information of each of the two user apparatuses 300 (C-RNTI # 100, C-RNTI # 200) is set for each TB.
- the “ACK / NACK header field” the number of identification information and the number of bits are set.
- the delivery confirmation information (Case 2) shown in FIG. 10 is an example in which C-RNTI is used as identification information when carrier aggregation is performed.
- the ACK / NACK information of each of the two user equipments 300 (C-RNTI # 100, C-RNTI # 200) is set for each cell (PCell, SCell1, SCell2) and for each TB.
- the “ACK / NACK header field” is the same as in case 1.
- the delivery confirmation information (Case 3) shown in FIG. 11 is an example using a CCE index as identification information.
- ACK / NACK information corresponding to each CCE index (CCE index # 2, CCE index # 5) of the two user apparatuses 300 is set for each TB.
- the “ACK / NACK header field” is the same as in case 1.
- the delivery confirmation information (case 4) shown in FIG. 12 is an example in which a CCE index is used as identification information when carrier aggregation is performed.
- ACK / NACK information for two user apparatuses 300 is set.
- the second user apparatus 300 (C-RNTI # 200)
- ACK / NACK information is set for each cell (PCell (CCE index # 4), SCell (CCE index # 40)) and for each TB.
- the ACK / NACK information is arranged in ascending order of CCE index values.
- the “ACK / NACK header field” is the same as in case 1.
- the overhanging device 220 transmits a reception response signal (ACK / NACK signal) for notifying whether or not the downlink signal transmitted to the user device 300 has been successfully received.
- the central aggregation device 210 generates the acknowledgment information for performing HARQ retransmission control of the downlink signal based on the reception response signal received from the user device 300, and transmits the acknowledgment information to the central aggregation device 210.
- the delivery confirmation information includes information (ACK / NACK information) indicating whether or not the reception response signal is successfully received.
- the central aggregation device 210 transmits scheduling information necessary for transmission of the downlink signal to the extension device 220, and performs HARQ retransmission control using the delivery confirmation information notified from the extension device 220. .
- the central aggregation device 210 has the MAC and the RLC, and the overhanging device 220 has the radio unit (RF) and the radio physical layer (L1).
- the protocol stacks to be included in the central aggregation device 210 and the overhanging device 220 are not necessarily limited to the form shown in FIG.
- FIGS. 13 (a) to 13 (c) show specific examples of protocol stacks that the central aggregation device and the extension device can have. Specifically, FIG. 13A shows details of the protocol stack shown in FIG.
- L1 in the downlink direction includes an encoding and modulation unit (Mod / FEC), a precoding unit, an IFFT unit, and a D / A conversion unit.
- L1 in the uplink direction includes an A / D conversion unit, an FFT unit, an EQ / IDFT unit, and a demodulation and decoding unit (DeMod / decoding).
- FIGS. 13B and 13C some functions of L1 are provided in the central aggregation device 210B, and other functions of L1 are provided in the overhanging device 220B.
- Such a separation form is called a PHY split.
- the present invention described above can also be applied to such a separation form of protocol stacks.
- the central aggregation device 210 has only the MAC and RLC, but may further have PDCP and RRC. In this case, the central aggregation device 210 may be directly connected to the wireless core network 20 without going through the central aggregation device 110.
- the user apparatus may be called a wireless communication terminal, a mobile station, or a user terminal
- the wireless base station is a node, a wireless communication apparatus, a system, or the like. You may be called.
Abstract
Description
図1は、本実施形態に係る無線通信システム10の全体概略構成図である。無線通信システム10は、Long Term Evolution(LTE)、及びLTEの後継システムである5Gに従った無線通信システムである。
次に、無線通信システム10の機能ブロック構成について説明する。具体的には、無線基地局200の中央集約装置210及び張出装置220の機能ブロック構成について説明する。
図3は、5Gの中央集約装置210の機能ブロック構成図である。図3に示すように、中央集約装置210は、スケジュール処理部211と、再送制御部212と、情報送信部213と、情報受信部215と、X2IF部217とを備える。
図4は、張出装置220の機能ブロック構成図である。図4に示すように、張出装置220は、情報受信部221と、無線通信部223と、送達確認情報生成部224と、情報送信部225と、通信設定部226とを備える。
次に、無線通信システム10の動作について説明する。具体的には、無線基地局200による下りリンク信号の送信処理について説明する。
(例えば、SPS(Semi-Persistent Scheduling) C-RNTIなど)
・割り当てたPDCCHのCCE(Control Channel Element)インデックス
(TDDの場合は、ACK/NACKは複数サブフレームの情報をまとめて返す必要があるため、関連する最後のPDCCHなどを参照する)
なお、SPSの場合はPDCCHが存在しないため、PUCCHリソースインデックス などを利用する必要がある。
・中央集約装置210から送信されたPDCCH情報に括り付けたインデックス
(例えば、PDCCH/PDSCHの伝送フォーマットで指定した識別情報などである。具体的には、ユーザ装置(1)にはインデックス1を、ユーザ装置(2)にはインデックス2を、ユーザ装置(3)にはインデックス3を割り当てることなどが考えられる。)
・PUCCHリソースインデックス
・無線基地局インプリの識別情報
(例えば、無線基地局に接続されたユーザ装置を無線基地局の装置内で識別するために払い出したIDなど)
なお、S13において、中央集約装置210から送信されるスケジューリング情報に含まれるPDCCH/PDSCHの伝送フォーマットと対応する並び順(同じ並び順)で、各ユーザ装置300のACK/NACK情報を設定した送達確認情報で中央集約装置210に送信(フィードバック)するとのルールを適用する場合は、「識別情報」は省略してもよい。
上述した実施形態によれば、張出装置220は、ユーザ装置300に送信した下りリンク信号の受信に成功したか否かを通知する受信応答信号(ACK/NACK信号)を、ユーザ装置300から受信し、受信応答信号に基づいて中央集約装置210が下りリンク信号のHARQ再送制御を行うための送達確認情報を生成し、送達確認情報を中央集約装置210に送信する。そして、送達確認情報には、受信応答信号における受信成功か否かを示す情報(ACK/NACK情報)が含まれる。
以上、実施形態に沿って本発明の内容を説明したが、本発明はこれらの記載に限定されるものではなく、種々の変形及び改良が可能であることは、当業者には自明である。
110 中央集約装置
120 張出装置
200 無線基地局
210 中央集約装置
211 スケジュール処理部
212 再送制御部
213 情報送信部
215 情報送信部
217 X2IF部
220 張出装置
221 情報受信部
223 無線通信部
224 送達確認情報生成部
225 情報送信部
226 通信設定部
300 ユーザ装置
Claims (3)
- 中央集約装置と、張出装置とを備え、ユーザ装置と無線通信を実行する無線基地局であって、
前記張出装置は、
下りリンク信号の受信に成功したか否かを通知する受信応答信号を、ユーザ装置から受信する受信部と、
前記受信応答信号に基づいて、前記中央集約装置が前記下りリンク信号の再送制御を行うための送達確認情報を生成する生成部と、
前記送達確認情報を前記中央集約装置に送信する送信部と、を備え、
前記送達確認情報には、前記受信応答信号における受信成功か否かを示す情報が含まれること
を特徴とする無線基地局。 - 請求項1記載の無線基地局であって、
前記中央集約装置は、
前記下りリンク信号のスケジューリング情報を、前記張出装置に送信する送信部を備え、
前記送信部は、複数の張出装置を用いてキャリアアグリゲーションを行う場合、所定の張出装置に、他の張出装置に対するスケジューリング情報を送信すること
を特徴とする無線基地局。 - 中央集約装置と、張出装置とを備え、ユーザ装置と無線通信を実行する無線基地局における通信制御方法であって、
前記張出装置は、
下りリンク信号の受信に成功したか否かを通知する受信応答信号を、ユーザ装置から受信する受信ステップと、
前記受信応答信号に基づいて、前記中央集約装置が前記下りリンク信号の再送制御を行うための送達確認情報を生成する生成ステップと、
前記送達確認情報を前記中央集約装置に送信する送信ステップと、を行い、
前記中央集約装置は、
前記下りリンク信号のスケジューリング情報を、前記張出装置に送信する送信ステップを行い、
前記送達確認情報には、前記受信応答信号における受信成功か否かを示す情報が含まれること
を特徴とする通信制御方法。
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WO2009031866A2 (en) * | 2007-09-08 | 2009-03-12 | Samsung Electronics Co., Ltd. | Apparatus and method for determining time to response of retransmission in a multihop relay wireless communication system |
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