WO2011052135A1 - 移動通信システム、中継局装置、基地局装置、無線中継方法、及びコンピュータ可読媒体 - Google Patents
移動通信システム、中継局装置、基地局装置、無線中継方法、及びコンピュータ可読媒体 Download PDFInfo
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- WO2011052135A1 WO2011052135A1 PCT/JP2010/005922 JP2010005922W WO2011052135A1 WO 2011052135 A1 WO2011052135 A1 WO 2011052135A1 JP 2010005922 W JP2010005922 W JP 2010005922W WO 2011052135 A1 WO2011052135 A1 WO 2011052135A1
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- relay
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
- H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
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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
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
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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), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
Definitions
- the present invention relates to a mobile communication system including a relay station that performs wireless relay between a base station and a mobile station, and more particularly to a relay technique for multicast information distributed simultaneously to a plurality of mobile stations.
- RN Relay node
- UE User Equipment
- eNB Evolved Node B
- a cell means a coverage area of a base station.
- a base station eNB: Evolved Node B having a function of connecting to an RN
- Donor eNB hereinafter DeNB
- DeNB Donor eNB
- the term “DeNB” is used to distinguish from a normal eNB only when a DeNB-specific event related to the connection with the RN is described.
- UE User Equipment
- eNB-UE a mobile station belonging to the DeNB without going through the RN
- RN-UE a mobile station belonging to the RN.
- RN-UE a mobile station belonging to the RN
- a radio interface connecting DeNB and RN and between upper RN and lower RN is referred to as “backhaul link”.
- the radio interface between eNB and eNB-UE, and between RN and RN-UE is called an “access link”.
- the backhaul link and the access link may share the same radio frequency (In-band method), or may use different radio frequencies (Out-band method).
- RN can be classified by the difference in relay operation (difference in layers).
- the simplest relay operation is an operation in which a radio signal transmitted from the DeNB is simply amplified and transmitted.
- An RN that performs a relay operation completed in such a PHY layer is called “Layer 1 Repeater”.
- the layer 1 repeater is transmitted from the DeNB and does not perform decoding and re-encoding of data (decoding and re-encoding).
- the RN that performs decoding and re-encoding of data transmitted from the DeNB is called “Layer 2 Relay”. Note that the layer 2 relay depends on the DeNB for radio resource scheduling and the like.
- the RN that further expands the function of the layer 2 relay and has substantially the same function as the eNB is called “Layer 3 Relay”, “Layer 3 Wireless Router”, “Self-backhauled eNB”, and the like.
- the layer 3 relay has a unique cell ID and performs unique scheduling and mobility management.
- the main target RNs in this specification are layer 2 relay and layer 3 relay.
- MBSFN Multimedia Broadcast Multicast Service Single Single Frequency Network
- MBSFN provides a broadcast / broadcast service, MBMS (Multimedia Broadcast multicast service), in a single frequency network (SFN).
- SFN single frequency network
- MBMS Multimedia Broadcast multicast service
- a plurality of adjacent base stations use the same frequency resource and transmit the same multicast / broadcast data (MBMS data) simultaneously.
- MBMS signal a downlink signal in which MBMS data is encoded and synchronously transmitted from a plurality of base stations.
- LTE employing the ODFM scheme as the downlink communication scheme it is necessary to design the multipath delay of the MBSFN signal within the guard interval of the ODFM signal in order to prevent the degradation of the reception characteristics of the MBSFN signal.
- a plurality of base stations belonging to the MBSFN synchronization area transmit MBSFN signals encoded with the same MBMS data in synchronization with each other based on MBMS scheduling information.
- FIG. 1 shows the logical architecture of MBSFN.
- the eNBs 901A to 901C form cells 902A to 902C, respectively, and provide the MBSFN service to the UE 903.
- the cells 902A to 902C that provide the MBSFN service are referred to as “MBSFN service cells”.
- MBSFN service cells a cell that provides a normal unicast service to the UE.
- the MBMS service is provided in a time division manner using the same carrier wave as the unicast service. That is, the MBSFN service cells 902A to 902C do not always provide the MBMS service but also provide the unicast service to the UE 903.
- MME 904, MCE 905, and MBMS GW 906 perform control related to MBMS service provision by MBSFN.
- An MME (Mobility Management Entity) 904 is connected to the eNBs 901A to 901C via the S1-MME interface, and performs mobility management and session management of the UE 903 belonging to the cells 902A to 902C.
- MCE (Multi-cell / multicast Coordination Entity) 905 is an entity belonging to E-UTRAN, and is connected to the eNBs 901A to 901C through the M2 interface.
- the M2 interface is a control plane (C-Plane) interface related to MBMS service provision.
- the MCE 905 determines radio resources (time and frequency resources), a modulation scheme, a coding scheme, and the like used during MBSFN operation by the eNBs 901A to 901C in the MBSFN synchronization area using the M2 interface.
- An MCE (Multi-cell / multicast Coordination Entity) 905 supplies “MBMS scheduling information” indicating radio resources (time and frequency resources) used during the MBSFN operation to the eNBs 901A to 901C.
- the MCE 905 is connected to the MME 904 through the M3 interface.
- the M3 interface is a C-Plane interface between E-UTRAN and EPC (Evolved Packet Core).
- EPC Evolved Packet Core
- the MCE 905 starts or stops the MBMS session in response to a message indicating the start or stop of the MBMS session issued from the EPC (specifically, the MME 904).
- MBMS GW 905 is connected to eNBs 901A to 901C via the M1 interface.
- the M1 interface is a user plane (U-Plane) interface related to MBMS service provision.
- MBMS 905 transmits MBMS data (MBMS packet) to eNBs 901A to 901C using IP multicast.
- FIG. 2 is a diagram illustrating a radio frame composition of LTE FDD (Frequency Division Duplex).
- One radio frame includes 10 subframes (# 0 to # 9).
- Each subframe consists of two slots.
- One slot length is 0.5 ms.
- Each slot includes multiple (N SYMB ) OFDM symbols in the time domain.
- a radio resource defined by one OFDM symbol in the time domain and one subcarrier in the frequency domain is called a “resource element”.
- the resource element is a minimum radio resource allocation unit in the LTE / E-UTRAN downlink employing ODFM (Orthogonal Frequency Division Multiplexing). Also, a resource unit defined by N SYMB OFDM symbols (for one slot) in the time domain and N SC OFDM subcarriers in the frequency domain that are continuous is called a “resource block”. In the case of the cyclic prefix that is normally used except when dealing with a special multipath environment, the value of N SYMB in the LTE downlink is 7 and the value of N SC is 12.
- FIG. 3 shows a specific example of scheduling of MBSFN subframes and normal subframes.
- a cell 912 is a unicast cell that does not provide an MBMS service.
- the MBSFN service cells 902A to 902C transmit MBMS data in a predetermined subframe according to the “MBMS scheduling information” supplied from the MCE 905.
- MCH Multicast channel
- PMCH Physical Multicast channel
- MBSFN subframe The subframe to which the PMCH is mapped.
- PDSCH Physical Downlink Shared Channel
- RS Reference Signal
- the inventors of the present application have found that there are the following problems in order to perform MBSFN transmission in an LTE-Advanced network environment using RN. That is, when an RN transmits an MBSFN signal, there is an inevitable delay time compared to a case where an MBMS signal is transmitted from a DeNB via a direct path, so that the RN may not be able to transmit MBMS data according to a predetermined transmission schedule. There is. An MBSFN signal delayed from the transmission schedule is not preferable because it causes the UE to be affected by the deterioration of the reception characteristics of the MBSFN signal due to an increase in multipath delay.
- FIG. 4 is obtained by adding RN 920 to the MBSFN architecture shown in FIG.
- the RN 920 connects a backhaul link to the eNB (DeNB) 901A.
- the RN 920 transmits the user data transferred from the DeNB 901A via the backhaul link (BL) to the UE 903 via the access link (AL).
- the DeNB 901A In order for the RN 920 to transmit the MBSFN signal, the DeNB 901A must first transfer the MBMS data received from the MBMS GW 906 to the RN 920 using the backhaul link. Further, the RN 920 must restore MBMS data by performing signal processing such as demodulation and channel decoding on the backhaul link radio signal.
- the RN 920 must map the restored MBMS data to an MBMS transport channel (MCH: Multicast Channel) and perform signal processing such as channel coding, modulation, and OFDM signal generation. Due to the accumulation of these delay times, the RN 920 may not be able to transmit the MBSFN signal according to the transmission schedule.
- MCH Multicast Channel
- the timing chart of FIG. 5 shows a typical example in which MBSFN signal transmission by the RN 920 does not follow the schedule.
- MBMS data (MBMS packet) is multicast transmitted from the MBMS 90 906 to the eNBs 901A to 901C.
- MBMS data is transferred from eNB 901A to RN 920 via the backhaul link.
- the eNBs 901A to 901C transmit a radio signal (MBSFN signal) encoded with MBSFN data in an MBSFN subframe.
- MBSFN signal radio signal
- the RN 920 follows the MBMS scheduling information because it takes time to acquire MBMS data from the backhaul radio signal and to perform signal processing necessary for generating the MBSFN signal encoded with the MBMS data. Transmission at time T3 cannot be performed. The RN 920 transmits the MBSFN signal at time T4 delayed from the schedule.
- the present invention has been made on the basis of the above-mentioned knowledge by the inventors and the like, and has been delayed by a predetermined transmission timing in a network including a relay station that performs wireless relay between a base station and a mobile station.
- An object of the present invention is to provide a mobile communication system, apparatus, method, and program capable of suppressing the MBSFN signal from being transmitted from a relay station.
- the mobile communication system includes a first base station and a relay station that performs radio relay between the first base station and the mobile station.
- the first base station is configured to transmit a first radio signal encoded with transfer information for transmission to the mobile station via the relay station in (i) first frame;
- the second radio signal encoded with the first multicast information received by the plurality of nodes is transmitted at a transmission timing synchronized with the neighboring base station.
- the relay station is configured to receive the first radio signal, and (i) if the transfer information encoded in the first radio signal is unicast information addressed to the mobile station.
- It is configured to decode cast information from the first radio signal, and to transmit a third radio signal encoded with the unicast information to the mobile station, and (ii) ⁇ ⁇ encoded into the first radio signal. Further, when the forwarding information is second multicast information having the same content as the first multicast information, the second multicast information is not decoded from the first radio signal.
- the mobile communication system includes a first base station and a relay station that performs radio relay between the first base station and the mobile station.
- the first base station is configured to (i) transmit a first radio signal encoded with unicast information for transmission to the mobile station via the relay station in the first frame.
- the second radio signal encoded with the multicast information received by the plurality of nodes is transmitted at the transmission timing synchronized with the neighboring base station.
- the relay station receives (i) the first radio signal transmitted in the first frame, decodes the unicast information from the first radio signal, and encodes the unicast information.
- receiving the second radio signal transmitted in the second frame and transmitting the second radio signal from the second radio signal to the mobile station.
- the second radio signal is amplified and retransmitted without decoding information.
- the mobile communication system includes a first base station and a relay station that performs radio relay between the first base station and the mobile station.
- the first base station is configured to transmit a first radio signal encoded with transfer information for transmission to the mobile station via the relay station in (i) first frame;
- the second radio signal encoded with the first multicast information received by the plurality of nodes is transmitted at a transmission timing synchronized with the neighboring base station.
- the forwarding information includes second multicast information having the same content as the first multicast information.
- the relay station is configured to transmit a third radio signal obtained by re-encoding the second multicast information decoded from the first radio signal to the mobile station in synchronization with the transmission timing. Yes.
- the first base station compares the first radio signal encoded with the second multicast information with the relay station compared to the second radio signal encoded with the first multicast information. Is transmitted earlier by a grace period longer than the delay time required for the relay processing of the second multicast information.
- the mobile communication system includes a first base station and a relay station that performs radio relay between the first base station and the mobile station.
- the first base station is configured to (i) transmit a first radio signal encoded with transfer information for transmission to the mobile station via the relay station in the first frame,
- the second radio signal encoded with the first multicast information received by the plurality of nodes is transmitted at a transmission timing synchronized with the neighboring base station.
- the relay station receives (i) the first radio signal transmitted in the first frame, decodes the transfer information from the first radio signal, and encodes the transfer information. 3 radio signals are transmitted to the mobile station.
- the transfer information includes unicast information addressed to the mobile station, and does not include the multicast information for which synchronous transmission is requested at the transmission timing.
- a fifth aspect of the present invention relates to a relay station apparatus that performs wireless relay between a first base station and a mobile station.
- the first base station transmits (i) a first radio signal encoded with transfer information to be transmitted to the mobile station via the relay station device in the first frame. And (ii) configured to transmit, in the second frame, the second radio signal encoded with the first multicast information received by the plurality of nodes at a transmission timing synchronized with the neighboring base station.
- the relay station apparatus includes a first communication unit, a downlink data processing unit, and a second communication unit. The first communication unit is configured to receive the first radio signal.
- the downlink data processing unit decodes the transfer information from the first radio signal received by the first communication unit and generates a third radio signal in which the transfer information is re-encoded. Is possible.
- the second communication unit is configured to transmit the third radio signal to the mobile station. Further, the downlink data processing unit (i) decodes the unicast information from the first radio signal when the transfer information is unicast information addressed to the mobile station, and (ii) the When the transfer information is the second multicast information having the same content as the first multicast information, the second multicast information is not decoded from the first radio signal.
- a sixth aspect of the present invention relates to a relay station apparatus that performs wireless relay between a first base station and a mobile station.
- the relay station apparatus includes a first communication unit, a downlink data processing unit, and a second communication unit.
- the first communication unit can receive a first radio signal encoded in unicast information for transmission to the mobile station and transmitted from the first base station in a first frame, and Multicast information received by the first node is encoded so that the second radio signal transmitted from the first base station and transmitted at the transmission timing synchronized with the neighboring base station in the second frame can be received.
- the downlink data processing unit decodes the unicast information from the first radio signal received by the first communication unit, and generates a third radio signal in which the unicast information is re-encoded. Is possible.
- the second communication unit can transmit the third wireless signal to the mobile station, and can transmit the second wireless signal without going through a process of decoding the multicast information from the second wireless signal. It is configured to be amplified and
- the seventh aspect of the present invention relates to a base station apparatus.
- the base station apparatus is configured to transmit (i) a first radio signal encoded with transfer information for transmission to the mobile station via the relay station in the first frame; and (ii) In the second frame, the second radio signal encoded with the first multicast information received by a plurality of nodes is transmitted at a transmission timing synchronized with the neighboring base station.
- the forwarding information includes second multicast information having the same content as the first multicast information.
- the base station apparatus compares the first radio signal encoded with the second multicast information with the second radio signal encoded with the first multicast information by the relay station. Transmission is performed earlier by a grace period longer than the delay time required for the relay processing of the second multicast information.
- An eighth aspect of the present invention relates to a radio relay method by a relay station that performs radio relay between a first base station and a mobile station.
- the first base station transmits (i) a first radio signal encoded with transfer information for transmission to the mobile station via the relay station in the first frame. And (ii) configured to transmit, in a second frame, a second radio signal encoded with first multicast information received by a plurality of nodes at a transmission timing synchronized with a neighboring base station.
- the method includes the following (a) to (d).
- a ninth aspect of the present invention relates to a radio relay method by a relay station that performs radio relay between a first base station and a mobile station.
- the method includes the following (a) to (e).
- C transmitting the third radio signal to the mobile station;
- a 10th aspect of this invention is related with the program for making a computer perform the signal processing regarding the relay station which performs a radio relay between a 1st base station and a mobile station.
- the first base station transmits (i) a first radio signal encoded with transfer information to be transmitted to the mobile station via the relay station device in the first frame. And (ii) configured to transmit, in the second frame, the second radio signal encoded with the first multicast information received by the plurality of nodes at a transmission timing synchronized with the neighboring base station.
- the signal processing performed by the computer executing the program includes the following (a) to (b).
- the transfer information encoded in the first radio signal received by the relay station is unicast information addressed to the mobile station, the unicast information is decoded and the unicast information Generating a re-encoded digital transmission signal, and (b) the transfer information encoded in the first wireless signal is second multicast information having the same content as the first multicast information. Do not decode the second multicast information.
- a mobile communication system capable of suppressing an MBSFN signal delayed from a predetermined transmission timing from being transmitted from the relay station.
- FIG. 6 shows a configuration example of the mobile communication system according to the present embodiment.
- the mobile communication system according to the present embodiment is an LTE-Advanced system including an RN, and its function is expanded to perform MBSFN transmission.
- the base station (DeNB) 10 forms a base station cell (eNB cell) 100 and performs downlink and uplink communication with the eNB-UE 13.
- eNB10 is DeNB which has a connection function with RN, and connects a backhaul link between RN11.
- the RN 11 forms a relay station cell (RN cell) 110 and performs downlink and uplink communication through an access link with the RN-UE 12. Note that the downlink radio frequency of the backhaul link and the downlink radio frequency of the access link may be different.
- the RN 11 receives a radio signal transmitted from the DeNB 10 via the backhaul link, performs DFT (Discrete Fourier Transform), and demodulation (symbol demapping) to restore the bit string of the physical channel. By performing signal processing such as channel decoding, a bit string of the transport channel is restored, and transfer information from the DeNB 10 included in the restored transport channel is acquired.
- DFT Discrete Fourier Transform
- demodulation symbol demapping
- the RN 11 maps the acquired transfer information to a transport channel for transmission to the RN-UE 12, and performs signal processing such as channel decoding, modulation, and ODFM signal generation (IDFT: Inverse Discrete Fourier Transform).
- IDFT Inverse Discrete Fourier Transform
- a radio signal to be transmitted to the access link is generated.
- the transfer information differs depending on the layer where the RN 11 is terminated.
- the transfer information may be, for example, transport channel data, logical channel data, or user data (IP packet). Similar to the downlink signal relay, the RN 11 also performs a transfer process with decoding and re-encoding on the uplink signal received from the RN-UE 12.
- the MBMS service control unit 15 supplies MBMS data to the DeNB 10 and transmits MBMS scheduling information defining the transmission timing (that is, transmission subframe) of the MBSFN signal encoded with MBMS data to the DeNB 10. That is, the MBMS service control unit 15 has the above-described MCE and MBMS-GW functions.
- the function of the MBMS service control unit 15 may be divided into a radio access network (E-UTRAN) and a core network (EPC).
- the MBMS service control unit 15 may be realized by one or a plurality of computers.
- the MBMS service control unit 15 may include a router that performs IP packet transfer.
- FIG. 7 is a block diagram illustrating a configuration example of the DeNB 10.
- a wireless communication unit 101 is an analog front end. That is, the wireless communication unit 101 receives an OFDM signal from the transmission data processing unit 602 that performs baseband signal processing of transmission data, performs transmission processing including D / A conversion, frequency conversion (up-conversion), and amplification to perform eNB -Generate a downlink signal to be transmitted to the UE 13 or RN11.
- the wireless communication unit 101 performs reception processing including amplification, frequency conversion (down-conversion), and A / D conversion on the uplink signal transmitted from the eNB-UE 13 or the RN 11, and the obtained baseband OFDM signal Is supplied to the received data processing unit 103.
- the transmission data processing unit 102 performs digital baseband signal processing related to transmission data. That is, the transmission data processing unit 102 acquires user data (including unicast data and MBMS data) and control data transmitted toward the eNB-UE 13 or the RN 11 from the communication unit 104. The transmission data processing unit 102 maps these transmission data to a transport channel (BCH (Broadcast Channel), DL-SCH (Downlink Shared Channel), PCH (Paging Channel), or MCH (Multicast Channel)), and transports them. Performs channel multiplexing, error correction coding, rate matching, interleaving, etc.
- BCH Broadcast Channel
- DL-SCH Downlink Shared Channel
- PCH Packet Control Channel
- MCH Multicast Channel
- the transmission data processing unit 102 performs scrambling, modulation (symbol mapping), and the like to generate a transmission symbol sequence for each physical channel. Further, the transmission data processing unit 102 performs layer mapping (when MIMO (Multiple Input / Multiple Output) is performed), precoding (when MIMO is performed), mapping to resource elements, IDFT, guard interval (cyclic prefix).
- a transmission baseband OFDM signal is generated from the transmission symbol sequence by signal processing including addition.
- the received data processing unit 103 performs digital baseband signal processing for restoring received data. That is, the reception data processing unit 103 performs signal processing including DFT, demodulation (symbol demapping), descrambling, and channel decoding on the reception baseband SC-FDMA signal supplied from the wireless communication unit 101.
- the uplink user data and control data transmitted from the eNB-UE 13, RN-UE 12, or RN 11 are restored.
- the obtained user data and some control data are transferred to a core network (not shown) via the communication unit 104.
- the scheduling control unit 105 performs downlink and uplink transmission scheduling between the RN 11 and the eNB-UE 13. Further, the scheduling control unit 105 performs transmission scheduling of an MBSFN signal encoded with MBMS data based on the MBMS scheduling information acquired from the MBMS service control unit 15.
- the PMCH encoded with MBMS data is mapped to the resource element in the MBSFN subframe.
- a normal subframe may be used for transmission of a physical channel addressed to the RN, or an MBSFN subframe may be used.
- the RN 11 needs to secure a gap period during which transmission to the RN-UE 12 is stopped and perform reception from the DeNB 10 during this gap period.
- it is known to perform transmission from the DeNB 10 to the RN 11 using the MBSFN subframe.
- the RN-UE 12 can recognize that it is not necessary to receive a downlink signal from the RN 11.
- FIG. 8 is a block diagram illustrating a configuration example of the RN 11.
- the access link wireless communication unit 111 has the same function as the wireless communication unit 101 of the DeNB 10. That is, the access link wireless communication unit 111 transmits a downlink signal to the RN-UE 12 via the antenna, and receives an uplink signal from the RN-UE 12 via the antenna.
- the backhaul link wireless communication unit 114 is an analog front end that transmits and receives downlink signals and uplink signals related to the backhaul link to and from the DeNB 10.
- the downlink data processing unit 112 performs digital baseband signal processing related to downlink signal relay from the DeNB 10 to the RN-UE 12. That is, the downlink data processing unit 112 receives a baseband OFDM signal from the backhaul link wireless communication unit 114. The downlink data processing unit 112 restores the bit string of the transport channel by performing signal processing such as DFT, demodulation, and channel decoding, and further acquires transfer information from the DeNB 10 included in the restored transport channel. . Further, the downlink data processing unit 112 maps the acquired transfer information to a transport channel for transmission to the RN-UE 12, and sends out to the access link by performing signal processing such as channel decoding, modulation, and IDFT. Generate a baseband OFDM signal. The generated baseband OFDM signal is supplied to the access link wireless communication unit 111.
- the uplink data processing unit 112 performs digital baseband signal processing related to uplink signal relay from the RN-UE 12 toward the DeNB 10. That is, the uplink data processing unit 112 receives the baseband SC-FDMA signal from the access link radio communication unit 111. The uplink data processing unit 112 restores uplink channel data by performing signal processing such as DFT, demodulation, and channel decoding. Further, the uplink data processing unit 112 performs transport channel mapping for transmitting the acquired uplink channel data to the DeNB 10, and sends out to the backhaul link by performing signal processing such as channel decoding, modulation, and IDFT. For generating a baseband SC-FDMA signal. The generated baseband SC-FDMA signal is supplied to the backhaul link wireless communication unit 114.
- the scheduling control unit 115 performs transmission scheduling for the access link and the backhaul link. Further, the scheduling control unit 115 is configured to stop the signal transmission at the same frequency as the MBSFN signal while the MBSFN signal is transmitted from the DeNB 10 based on the MBMS scheduling information acquired from the MBMS service control unit 15. 111 and 114 are controlled.
- FIG. 9 is a block diagram illustrating a configuration example of the MBMS service control unit 15.
- the MBSFN controller 151 has the MCE function described above. That is, the MBSFN controller 151 performs MBSFN-related signaling with the base station in the MBSFN synchronization area including the DeNB 10. The MBSFN controller 151 transmits MBMS scheduling information to the base stations in the MBSFN synchronization area including the DeNB 10.
- the forwarding unit 152 has the MBMS GW function described above. That is, the forwarding unit 152 acquires MBMS data from the MBMS data source and transmits the MBMS data to the base station in the MBSFN synchronization area including the DeNB 10.
- FIG. 10 is a flowchart illustrating a specific example of the downlink transmission operation of the DeNB 10.
- the scheduling unit 105 receives MBMS scheduling information from the MBMS service control unit 15 via the communication unit 104.
- the scheduling unit 105 transmits MBMS scheduling information to the RN 11 via the backhaul link via the transmission data processing unit 102 and the wireless communication unit 101.
- step S103 the transmission data processing unit 102 and the radio communication unit 101 transmit a radio signal encoded with unicast data for the RN-UE 12 to the RN 11 via the backhaul link according to the scheduling by the scheduling unit 105.
- step S104 the communication unit 104 receives MBMS data from the service control unit 15.
- step S105 the transmission data processing unit 102 and the wireless communication unit 101 transfer the wireless signal encoded with MBMS data to the RN 11 via the backhaul link according to the scheduling by the scheduling unit 105.
- step S106 the transmission data processing unit 102 and the wireless communication unit 101 transmit a downlink signal (MBSFN signal) encoded with MBMS data.
- MMSFN signal downlink signal
- This transmission is performed at a transmission timing synchronized with the neighboring base station according to the scheduling by the scheduling unit 105 based on the MBMS scheduling information.
- step S103 the transmission to the unicast data to the backhaul link in FIG. 10 (step S103) is not related to other transmission processing (transmission of MBMS scheduling information, transmission of MBMS data). That is, step S103 may be performed at an arbitrary timing except that resource elements used for transmission do not overlap.
- FIG. 11 is a flowchart showing a specific example of the relay operation of the RN 11.
- the downlink data processing unit 112 decodes MBMS scheduling information from the received signal of the backhaul link and stores it in a memory (not shown). That is, the downlink data processing unit 112 performs demodulation and channel decoding on the received signal to restore the transport channel, and acquires MBMS scheduling information as transfer information from the restored transport channel.
- step S202 the downlink data processing unit 112 decodes the unicast data as transfer information from the received signal of the backhaul link. Further, the downlink data processing unit 112 performs re-encoding and modulation processing on the unicast data to generate a downlink signal in which the unicast data is encoded. That is, the downlink data processing unit 112 maps the unicast data to a transport channel (DL-SCH or the like), performs channel coding and modulation processing on the bit string of the transport channel, and transmits the downlink to the access link. A signal (baseband OFDM signal) is generated.
- the access link wireless communication unit 111 transmits a downlink signal encoded with unicast data addressed to the RN-UE 12 to the access link.
- step S204 the scheduling unit 115 and the downlink data processing unit 112 ignore the MBMS data included in the transfer information. Specifically, the downlink data processing unit 112 may not decode the transport channel (MCH) including MBMS data transferred from the DeNB 10 via the backhaul link. This is because the RN 11 in the present embodiment does not transfer MBMS data to the RN-UE 12.
- MCH transport channel
- step S205 the scheduling unit 115, based on the MBMS scheduling information, the downlink data processing unit 112 and the access link radio communication so as to stop the downlink transmission to the access link in the MBSFN subframe in which the MBSFN signal is transmitted from the DeNB 10.
- the unit 111 is controlled.
- the transmission of the downlink signal in step S205 may be stopped for the frequency band used by the DeNB 10 for MBSFN transmission.
- the RN 11 performs frequency conversion at the time of relaying, and the frequency band used by the RN 11 for downlink transmission and the MBSFN transmission frequency band of the DeNB 10 are different, the RN 11 does not stop the downlink signal transmission. Good.
- the RN 11 of the present embodiment encodes multicast information when the transfer information encoded in the radio signal transmitted from the DeNB 10 through the backhaul link is multicast information (that is, MBMS data).
- the radio signal (MBSFN signal) is configured not to be transmitted to the RN-UE 12.
- the RN 11 may not decode the transport channel (MCH) including MBMS data transferred from the DeNB 10 via the backhaul link. That is, the RN 11 of this embodiment does not perform MBSFN transmission. Thereby, it is possible to prevent the MBSFN signal delayed from the transmission timing defined by the MBMS scheduling information from being transmitted from the RN 11.
- the following effects can be obtained by stopping the downlink transmission to the access link by the RN 11 in the MBSFN subframe in which the MBSFN signal is transmitted from the DeNB 10. Is obtained. That is, interference with RN-UE 12 and eNB-UE 13 that receive the MBSFN signal can be suppressed.
- FIG. 12 is a block diagram illustrating a configuration example of the RN 11 that performs switching between the layer 2 or 3 relay operation and the layer 1 repeater operation.
- a bypass signal line 216 that bypasses the downlink data processing unit 112 is provided between the backhaul link radio communication unit 114 and the access link radio unit 111.
- the scheduling control unit 215 switches to the layer 1 repeater operation when MBSFN is transmitted by the DeNB 10 based on the MBMS scheduling information. Specifically, the scheduling control unit 215 supplies a signal received by the backhaul link wireless communication unit 114 to the access link wireless communication unit 111 via the bypass signal line 216 (bypassing the downlink data processing unit 112). Switch signal paths as Note that the target of amplification and retransmission by the layer 1 repeater operation may be only the downlink signal, and may not be the uplink signal from the RN-UE 12.
- FIG. 13 is a diagram illustrating a configuration example of the backhaul link wireless communication unit 114 and the access link link wireless communication unit 111 that can switch the downlink signal relay operation.
- the downlink signal of the backhaul link received by the antenna is supplied to an RF (Radio Frequency) switch 1143 via a band selection filter 1141 for band selection and a low noise amplifier 1142.
- the RF switch 1143 operates according to the SW control signal supplied from the scheduling control unit 215, and switches the output destination of the input RF signal (downlink signal) between the mixer 1144 and the bypass signal line 216.
- the scheduling control unit 215 may control the RF switch 1143 so that the mixer 1144 side is selected when performing a normal layer 2 or 3 relay operation with decoding and re-encoding.
- the RF switch 1143 may be controlled so that the bypass signal line 216 side is selected.
- the mixer 1144 multiplies the local signal generated by the frequency synthesizer 1145 and the RF signal (downlink signal), thereby down-converting to the baseband band.
- the reception signal down-converted by the mixer 1144 is supplied to the A / D converter 1146 via the low-pass filter 1145.
- the downlink data processing unit 112 that performs digital baseband processing uses the received signal data sequence sampled by the A / D converter 1146 to perform DFT, demodulation (symbol demapping), channel decoding, and transport channel (TCH). Signal processing including separation of Thereby, the downlink data processing unit 112 restores the transfer information from the DeNB 10. Furthermore, the downlink data processing unit 112 performs signal processing including TCH multiplexing, channel coding, modulation (symbol mapping), and IDFT on the transfer information, and transmits the downlink signal data to the access link. Generate a sequence (baseband OFDM signal). The downlink signal data string is supplied to the access link wireless communication unit 111.
- the D / A converter 1111, the mixer 1112, the frequency synthesizer 1113, and the bandpass filter 1114 included in the access link wireless communication unit 111 of FIG. 13 are used when performing a layer 2 or 3 relay operation. That is, the D / A converter 1111 converts the downlink signal data sequence (baseband OFDM signal) into an analog signal and supplies the analog signal to the mixer 1112. The mixer 1112 multiplies the local signal generated by the frequency synthesizer 1113 and the analog baseband OFDM signal to generate an RF band transmission signal. The RF band transmission signal generated by the mixer 1112 is supplied to a directional coupler 1115 via a bandpass filter (BPF) 1114.
- BPF bandpass filter
- the directional coupler 1115 combines a signal from the BPF 1114 and a signal from a level adjuster 1117 described later and supplies the combined signal to the transmission power amplifier 1116.
- the transmission power amplifier 1116 amplifies the transmission signal and outputs it to the antenna.
- the level adjuster 1117 included in the access link wireless communication unit 111 in FIG. 13 adapts the received signal level of the RF band supplied from the RF switch 1143 through the bypass signal line 216 to the input dynamic range of the transmission power amplifier 1116. Adjust to For the level adjuster 1117, for example, a variable attenuator or a variable gain amplifier may be used.
- circuit configuration of FIG. 13 is merely a conceptual and representative example.
- the arrangement of amplifiers and filters in FIG. 13 may be changed as appropriate.
- 13 is a direct conversion method, it may be a heterodyne method.
- FIG. 14 is a flowchart showing a specific example of the relay operation procedure of the RN 11 according to the present embodiment.
- steps S201 to S204 are the same as the corresponding steps shown in FIG.
- the scheduling unit 115 controls the radio communication units 111 and 114 to perform the layer 1 repeater operation in the MBSFN subframe in which the MBSFN signal is transmitted from the DeNB 10 based on the MBMS scheduling information.
- the scheduling unit 115 controls the downlink data processing unit 112 so that the relay signal that has passed through the decoding and encoding processing is not transmitted.
- the RN 11 is configured so that the transfer information encoded in the radio signal transmitted from the DeNB 10 through the backhaul link is multicast information (that is, MBMS data). Is ignored. Specifically, the RN 11 may not decode the transport channel (MCH) including MBMS data transferred from the DeNB 10 via the backhaul link. Accordingly, the RN 11 does not transmit a downlink signal in which MBMS data generated through the decoding and re-encoding processing in the RN 11 is encoded. Therefore, it is possible to prevent the MBSFN signal delayed from the transmission timing defined by the MBMS scheduling information from being transmitted from the RN 11.
- MCH transport channel
- the RN 11 of the present embodiment switches to the layer 1 repeater operation at the timing when the MBSFN signal is transmitted from the DeNB 10. That is, the RN 11 amplifies and retransmits the MBSFN signal received from the DeNB 10 without performing decoding and re-encoding at the timing when the MBSFN signal is transmitted from the DeNB 10. Thereby, the delay due to decoding and re-encoding is suppressed, and the MBSFN signal can be retransmitted with a low delay, so that an increase in multipath delay can be suppressed.
- the MBSFN service area can be expanded as compared to the case where downlink transmission is stopped as in the first embodiment.
- the DeNB 10 suppresses MBMS data transfer on the backhaul link to the RN 11. Thereby, in addition to preventing a delayed MBSFN signal from being transmitted due to decoding and re-encoding in the RN 11, it can be expected to improve the utilization efficiency of radio resources of the backhaul link.
- FIG. 15 is a flowchart illustrating a specific example of the downlink transmission operation of the DeNB 10 according to the present embodiment.
- FIG. 15 is the same as the flow of FIG. 10 described in the first embodiment except that step S105 is not included. That is, even if the DeNB 10 according to the present embodiment receives MBMS data from the MBMS service control unit 15, it does not transfer it to the RN 11.
- FIG. 16 is a flowchart showing a specific example of the relay operation of the RN 11 of the present embodiment.
- steps S201 to S203 are the same as the corresponding steps shown in FIG.
- the MBMS data is not included in the transfer information from the DeNB 10, and therefore the step (S204) relating to the MBMS data is unnecessary.
- step S404 of FIG. 16 in the MBSFN subframe in which the MBSFN signal is transmitted from the DeNB 10, the RN 11 stops the downlink transmission to the access link as in the first embodiment, or the second embodiment. Switch to layer 1 repeater operation as in the configuration.
- the RN 11 determines whether the MBMS data transferred from the DeNB 10 via the backhaul link can be transmitted according to a predetermined schedule. When it is determined that transmission is possible, the RN 11 transmits the MBSFN signal generated through decoding and re-encoding by the downlink data processing unit 112 according to the MBMS transmission schedule. On the other hand, when it is determined that transmission is not possible, the RN 11 does not transmit an MBSFN signal in which MBMS data transferred via the backhaul link is re-encoded.
- the RN 11 performs downlink transmission to the access link in the MBSFN subframe in which the MBSFN signal is transmitted from the DeNB 10 as in the first embodiment. It may be stopped or switched to the layer 1 repeater operation as in the second embodiment.
- FIG. 17 is a flowchart illustrating a specific example of the relay operation of the RN 11 according to the present embodiment. Of the steps shown in FIG. 17, steps S201 to S203 are the same as the corresponding steps shown in FIG.
- the RN 11 determines whether the MBMS data included in the transfer information can be relayed based on the MBMS scheduling information. Whether or not RN11 can complete signal processing including mapping of MBMS data to MCH, channel decoding, modulation (symbol mapping), and OFDM signal generation (IFDT) by a transmission time determined by MBMS scheduling information Can be determined. Specifically, the RN 11 compares the grace time (T) from the acquisition time of the MBMS data included in the transfer information to the transmission time specified in the schedule with the internal processing time (T1) required for the above signal processing. When T is equal to or greater than T1, it may be determined that relaying is possible.
- RN11 may determine that relaying is not possible when T is smaller than T1.
- the internal processing time T1 may be stored in advance in a nonvolatile memory (not shown) in the RN 11, or may be obtained by the scheduling unit 115 (215) by statistical processing based on past processing results.
- step S504 If it is determined that transfer is not possible in step S504, the RN 11 ignores the MBMS data included in the transfer information and does not transmit the MBSFN signal that has been decoded and re-encoded (step S505).
- step S506 in the MBSFN subframe in which the MBSFN signal is transmitted from the DeNB 10, the RN 11 stops the downlink transmission to the access link as in the first embodiment, or is the same as in the second embodiment. Switch to layer 1 repeater operation.
- the downlink data transmission unit 112 maps the MBMS data decoded from the received signal of the backhaul link to the MCH, and generates the PMCH (step S507). Further, the downlink data transmission unit 112 generates an OFDM signal through layer mapping, resource element mapping, and OFDM signal generation (IDFT).
- IDFT OFDM signal generation
- step S508 in the MBSFN subframe in which the MBSFN signal is transmitted from the DeNB 10, the access link radio communication unit 111 downlinks the OFDM signal (MBSFN signal) in the RF band including the PMCH generated through decoding and re-encoding. Send to.
- MBSFN signal OFDM signal
- the RN 11 determines whether or not MBSFN transmission can be performed by completing the signal processing including decoding and re-encoding and transmitting timing determined by the MBMS scheduling information.
- the transmission time is not in time, the MBSFN signal generated through decoding and re-encoding is not transmitted, so that it is possible to prevent the MBSFN signal delayed from the transmission timing from being transmitted from the RN 11.
- ⁇ Fifth embodiment> In the above-described fourth embodiment, an example has been described in which the RN 11 determines whether MBSFN transmission can be performed before the transmission timing determined by the MBMS scheduling information. In the present embodiment, an example will be described in which the DeNB 10 transfers MBMS data to the RN 11 with sufficient grace time before transmission timing in consideration of the delay time required for the signal processing of the RN 11.
- FIG. 18 is a flowchart illustrating a specific example of the downlink transmission operation by the DeNB 10 according to the present embodiment. Of the steps shown in FIG. 18, steps S101 to S104 and S106 are the same as the corresponding steps shown in FIG.
- step S605 the DeNB 10 (scheduling unit 105) determines whether MBMS data can be transferred to the RN 11. In the determination of whether transfer is possible, the grace time (T) from the acquisition time of MBMS data from the MBMS service control unit 15, the scheduled transfer time of MBMS data to the RN 11, or the current time to the transmission time determined in the schedule is obtained
- the time T may be compared with the internal processing time (T1) required for the transfer process in the RN11.
- DeNB10 should just determine with relaying, when T is T1 or more.
- RN11 may determine that relaying is not possible when T is smaller than T1.
- the DeNB 10 may receive the internal processing time T1 of the RN 11 from the RN 11. Further, the internal processing time T1 of the RN 11 may be set in the DeNB 10 by the operator.
- the DeNB 10 transfers the MBMS data to the RN 11 via the backhaul link on the condition that it is determined that transmission is possible in Step S605 (Step S606).
- FIG. 19 is a flowchart showing a specific example of the relay operation of the RN 11 of the present embodiment. Of the steps shown in FIG. 19, steps S201 to S203 are the same as the corresponding steps shown in FIG.
- the RN 11 transmits an MBSFN signal to the access link in the MBSFN subframe in which the MBSFN signal is transmitted from the DeNB 10, as in the first embodiment.
- the downlink transmission is stopped, or the layer 1 repeater operation is switched as in the second embodiment (step S705).
- the RN 11 maps the MBMS data decoded from the received signal of the backhaul link to the MCH, and sets the PMCH. Generate (step S706). Further, the downlink data transmission unit 112 generates an OFDM signal through layer mapping, resource element mapping, and OFDM signal generation (IDFT).
- IDFT OFDM signal generation
- step S707 in the MBSFN subframe in which the MBSFN signal is transmitted from the DeNB 10, the RN 11 (access link wireless communication unit 111) performs an OFDM signal (MBSFN signal) of the RF band including the PMCH generated through decoding and re-encoding. To the downlink.
- MBSFN signal OFDM signal
- the DeNB 10 transfers MBMS data to the RN 11 with a sufficient grace time before the transmission timing in consideration of the delay time required for the signal processing of the RN 11.
- the MBSFN signal can be transmitted according to the transmission timing determined by the RN 11. Therefore, it is possible to prevent the MBSFN signal delayed from the transmission timing defined by the MBMS scheduling information from being transmitted from the RN 11.
- FIG. 20 is a flowchart showing a specific example of the MBMS data transmission operation by the MBMS service control unit 15.
- the MBMS data control unit 15 (MBSFN controller 151) transmits MBMS scheduling information to the DeNB 10 and the RN 11.
- the MBMS data control unit 15 (forwarding unit 152) transmits MBMS data to the RN 11 with sufficient grace time until the transmission timing based on the MBMS scheduling information and the internal processing time (T1) of the RN 11.
- the MBMS data control unit 15 transmits MBMS data to the DeNB 10.
- IP multicast is generally used for MBMS data transmission.
- step S803 may be performed simultaneously with step S802.
- each device (DeNB 10, RN 11, MBMS service control unit 15) described in the first to fifth embodiments is ASIC (Application Specific Integrated Circuit), DSP (Digital Signal Processor), MPU (MPU). It can be realized using a computer system including a micro processing unit (CPU), a central processing unit (CPU), or a combination thereof. Specifically, the computer system may be made to execute a program including a group of instructions related to the processing procedure of each device described with reference to the sequence diagram or the flowchart.
- ASIC Application Specific Integrated Circuit
- DSP Digital Signal Processor
- MPU MPU
- It can be realized using a computer system including a micro processing unit (CPU), a central processing unit (CPU), or a combination thereof. Specifically, the computer system may be made to execute a program including a group of instructions related to the processing procedure of each device described with reference to the sequence diagram or the flowchart.
- Non-transitory computer readable media include various types of tangible storage media (tangible storage medium). Examples of non-transitory computer-readable media include magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable ROM), flash ROM, RAM (random access memory)) are included.
- the program may also be supplied to the computer by various types of temporary computer-readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
- the temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
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Abstract
Description
また、本明細書では、RNを介さずにDeNBに帰属する移動局(以下UE:User Equipment)を「eNB-UE」と呼ぶ。これに対して、RNに帰属する移動局を「RN-UE」と呼ぶ。また、eNB-UEとRN-UEの共通の事象である場合は、単に「UE」と記述する。
また、本明細書では、DeNBとRN間および上位RNと下位RN間を接続する無線インタフェースを「バックホールリンク」と呼ぶ。一方、eNBとeNB-UE間、RNとRN-UE間の無線インタフェースを「アクセスリンク」と呼ぶ。バックホールリンクとアクセスリンクは、同じ無線周波数を共用してもよいし(In-band方式)、互いに異なる無線周波数を使用してもよい(Out-band方式)。
前記中継局装置は、第1の通信部、ダウンリンクデータ処理部、及び第2の通信部を有する。前記第1の通信部は、前記第1の無線信号を受信できるよう構成されている。前記ダウンリンクデータ処理部は、前記第1の通信部により受信された前記第1の無線信号から前記転送情報をデコードするとともに、前記転送情報が再エンコードされた第3の無線信号を生成することが可能である。前記第2の通信部は、前記第3の無線信号を前記移動局に送信できるよう構成されている。さらに、前記ダウンリンクデータ処理部は、 (i)前記転送情報が前記移動局宛てのユニキャスト情報である場合に、前記ユニキャスト情報を前記第1の無線信号からデコードするとともに、(ii) 前記転送情報が、前記第1のマルチキャスト情報と同内容の第2のマルチキャスト情報である場合に、前記第2のマルチキャスト情報を前記第1の無線信号からデコードしないことができるよう構成されている。
当該方法は、以下の(a)~(d)を含む。
(a)前記第1の無線信号を受信すること、
(b)受信された前記第1の無線信号にエンコードされた前記転送情報が前記移動局宛てのユニキャスト情報である場合に、前記ユニキャスト情報をデコードするとともに、前記ユニキャスト情報が再エンコードされた第3の無線信号を生成すること、
(c)前記第1の無線信号にエンコードされた前記転送情報が前記第1のマルチキャスト情報と同内容の第2のマルチキャスト情報である場合に、前記第2のマルチキャスト情報を前記第1の無線信号からデコードしないこと、及び
(d)前記第3の無線信号を前記移動局に送信すること。
(a)前記移動局に送信するためのユニキャスト情報がエンコードされて前記第1の基地局から第1のフレームにおいて送信される第1の無線信号を受信すること、
(b)受信された前記第1の無線信号から前記ユニキャスト情報をデコードするとともに、前記ユニキャスト情報が再エンコードされた第3の無線信号を生成すること、
(c)前記第3の無線信号を前記移動局に送信すること、
(d)複数のノードによって受信されるマルチキャスト情報がエンコードされて前記第1の基地局から第2のフレームにおいて周辺基地局と同期した送信タイミングで送信される第2の無線信号を受信すること、及び
(e)前記マルチキャスト情報を前記第2の無線信号からデコードする処理を経由することなく前記第2の無線信号を増幅して再送信すること。
当該プログラムを実行するコンピュータにより行われる前記信号処理は、以下の(a)~(b)を含む。
(a)前記中継局によって受信された前記第1の無線信号にエンコードされた前記転送情報が前記移動局宛てのユニキャスト情報である場合に、前記ユニキャスト情報をデコードするとともに、前記ユニキャスト情報が再エンコードされたデジタル送信信号を生成すること、及び
(b)前記第1の無線信号にエンコードされた前記転送情報が前記第1のマルチキャスト情報と同内容の第2のマルチキャスト情報である場合に、前記第2のマルチキャスト情報をデコードしないこと。
図6は、本実施の形態にかかる移動通信システムの構成例を示している。なお、図6には、RN11、RN-UE12、及びeNB-UE13をそれぞれ1つずつしか示していないが、これらはそれぞれ複数台存在してもよい。本実施の形態の移動通信システムは、RNを含むLTE-Advancedシステムであって、MBSFN送信を行うよう機能拡張されている。基地局(DeNB)10は、基地局セル(eNBセル)100を形成し、eNB-UE13との間でダウンリンク及びアップリンク通信を行う。また、eNB10は、RNとの接続機能を有するDeNBであり、RN11との間でバックホールリンクを接続する。
上述した第1の実施の形態では、DeNB10によるMBSFN送信時にRN11がダウンリンク信号の送信を停止する例について示した。本実施の形態では、DeNB10によるMBSFN送信時にRN11がレイヤ2又は3のリレー動作からレイヤ1リピータ動作に切り替えることで、MBSFN信号を低遅延で増幅中継する例について説明する。
本実施の形態では、DeNB10がRN11に対するバックホールリンクでのMBMSデータの転送を抑止する。これにより、RN11における復号化及び再符号化に起因して遅延したMBSFN信号が送信されることを防止できることに加え、バックホールリンクの無線リソースの利用効率向上が期待できる。
本実施の形態では、RN11は、DeNB10からバックホールリンク経由で転送されたMBMSデータを定められたスケジュールに従って送信できるか否かを判定する。RN11は、送信可能と判定された場合に、ダウンリンクデータ処理部112による復号化および再符号化を経て生成されたMBSFN信号を、MBMS送信スケジュールに従って送信する。一方、送信不可と判定された場合には、RN11は、バックホールリンク経由で転送されたMBMSデータが再符号化されたMBSFN信号を送信しない。なお、MBMSデータが再符号化されたMBSFN信号を送信しない場合、RN11は、MBSFN信号がDeNB10から送信されるMBSFNサブフレームにおいて、第1の実施の形態と同様にアクセスリンクへのダウンリンク送信を停止するか、又は第2の実施の形態と同様にレイヤ1リピータ動作に切り替えればよい。
上述の第4の実施の形態では、MBMSスケジューリング情報で定められた送信タイミングまでにMBSFN送信を行えるか否かをRN11が判定する例を示した。本実施の形態では、DeNB10が、RN11の信号処理に要する遅延時間を考慮して、送信タイミングまでに十分な猶予時間をもってRN11へのMBMSデータの転送を行う例について説明する。
第1~第5の実施の形態では、EPS/E-UTRANの場合について具体的に説明した。しかしながら、これらの実施の形態で説明した、予め規定された送信タイミングに遅れたMBSFN信号が中継局から送出されることを防止するための技術は、他の移動通信システムに適用してもよい。
11 中継局(RN:Relay Node)
12 中継局に帰属する移動局(RN-UE)
13 基地局に帰属する移動局(eNB-UE)
15 MBMSサービス制御部
100 基地局セル(eNBセル)
110 中継局セル(RNセル)
101無線通信部
102 送信データ処理部
103 受信データ処理部
104 通信部
105 スケジューリング制御部
111 アクセスリンク無線通信部
112 ダウンリンクデータ処理部
113 アップリンクデータ処理部
114 バックホールリンク無線通信部
115 スケジューリング制御部
151 MBSFNコントローラ
152 フォワーディング部
215 スケジューリング部
216 バイパス信号線
Claims (37)
- 第1の基地局、及び前記第1の基地局と移動局との間で無線中継を行う中継局とを備え、
前記第1の基地局は、(i) 第1のフレームにおいて、前記中継局を経由して前記移動局に送信するための転送情報がエンコードされた第1の無線信号を送信するよう構成され、かつ (ii) 第2のフレームにおいて、複数のノードによって受信される第1のマルチキャスト情報がエンコードされた第2の無線信号を周辺基地局と同期した送信タイミングで送信するよう構成され、
前記中継局は、前記第1の無線信号を受信できるよう構成され、(i) 前記第1の無線信号にエンコードされた前記転送情報が前記移動局宛てのユニキャスト情報である場合に、前記ユニキャスト情報を前記第1の無線信号からデコードするとともに、前記ユニキャスト情報がエンコードされた第3の無線信号を前記移動局に送信するよう構成され、(ii) 前記第1の無線信号にエンコードされた前記転送情報が前記第1のマルチキャスト情報と同内容の第2のマルチキャスト情報である場合に、前記第2のマルチキャスト情報を前記第1の無線信号からデコードしないことができるよう構成されている、
移動通信システム。 - 前記中継局は、前記送信タイミングにおいて、前記ユニキャスト情報がエンコードされた無線信号の前記移動局への送信を停止するよう構成されている、請求項1に記載の移動通信システム。
- 前記中継局は、前記送信タイミングにおいて前記第1の基地局から送信される前記第2の無線信号を受信し、前記第2の無線信号から前記第1のマルチキャスト情報をデコードすることなく前記第2の無線信号を増幅して再送信するよう構成されている、請求項1又は2に記載の移動通信システム。
- 前記中継局は、前記送信タイミングにおいて、前記第2の無線信号と同一の無線リソースを使用したダウンリンク送信を停止する、請求項1又は2に記載の移動通信システム。
- 前記中継局は、前記第1の無線信号からデコードされた前記第2のマルチキャスト情報を再エンコードすることで生成される第3の無線信号を前記移動局に送信するか否かを、前記送信タイミングに同期して前記第3の無線信号を送信できるか否かによって決定する、請求項1~4のいずれか1項に記載の移動通信システム。
- 前記中継局は、前記第1の無線信号からデコードされた前記第2のマルチキャスト情報の取得時刻から前記送信タイミングまでの猶予時間に基づいて、前記第3の無線信号を送信するか否かを決定する、請求項5に記載の移動通信システム。
- 前記中継局は、前記猶予時間が所定の閾値を超える場合に、前記第3の無線信号の送信を実行する、請求項6に記載の移動通信システム。
- 前記閾値は、前記第2のマルチキャスト情報に対する再エンコードを行って物理チャネルのビット列を生成し、前記ビット列に対する変調処理を行って前記第3の無線信号を生成するのに要する処理時間に応じて決定される、請求項7に記載の移動通信システム。
- 前記中継局は、前記第1の基地局による前記第2の無線信号の送信タイミングを判定可能なスケジューリング情報を前記第1の基地局を経由して受信する、請求項1~8のいずれか1項に記載の移動通信システム。
- 前記第2のマルチキャスト情報は、3GPP(3rd Generation Partnership Project)で規定されているMBMS(Multimedia Broadcast multicast service)データ又はMBMSデータを含むMCH(Multicast Channel)である、請求項1~9のいずれか1項に記載の移動通信システム。
- 第1の基地局、及び前記第1の基地局と移動局との間で無線中継を行う中継局とを備え、
前記第1の基地局は、 (i) 第1のフレームにおいて、前記中継局を経由して前記移動局に送信するためのユニキャスト情報がエンコードされた第1の無線信号を送信するよう構成され、かつ (ii) 第2のフレームにおいて、複数のノードによって受信されるマルチキャスト情報がエンコードされた第2の無線信号を周辺基地局と同期した送信タイミングで送信するよう構成され、
前記中継局は、(i) 前記第1のフレームで送信される前記第1の無線信号を受信し、前記ユニキャスト情報を前記第1の無線信号からデコードするとともに、前記ユニキャスト情報がエンコードされた第3の無線信号を前記移動局に送信するよう構成され、かつ、(ii)前記第2のフレームで送信される前記第2の無線信号を受信し、前記第2の無線信号から前記マルチキャスト情報をデコードすることなく前記第2の無線信号を増幅して再送信するよう構成されている、
移動通信システム。 - 前記中継局は、前記第1の基地局による前記第2の無線信号の送信タイミングを判定可能なスケジューリング情報を前記第1の基地局を経由して受信する、請求項11に記載の移動通信システム。
- 第1の基地局及び前記第1の基地局から送信される無線信号を受信して移動局に中継する中継局とを備え、
前記第1の基地局は、 (i) 第1のフレームにおいて、前記中継局を経由して前記移動局に送信するための転送情報がエンコードされた第1の無線信号を送信するよう構成され、かつ (ii) 第2のフレームにおいて、複数のノードによって受信される第1のマルチキャスト情報がエンコードされた第2の無線信号を周辺基地局と同期した送信タイミングで送信するよう構成され、
前記転送情報は、前記第1のマルチキャスト情報と同内容の第2のマルチキャスト情報を含み、
前記中継局は、前記第1の無線信号からデコードされた前記第2のマルチキャスト情報が再エンコードされた第3の無線信号を、前記送信タイミングに同期して前記移動局に送信するよう構成され、
前記第2のマルチキャスト情報がエンコードされた前記第1の無線信号は、前記第1のマルチキャスト情報がエンコードされた第2の無線信号に比べて、前記中継局による前記第2のマルチキャスト情報の中継処理に要する遅延時間よりも長い猶予時間だけ早く送信される、
移動通信システム。 - 前記中継局は、前記送信タイミングを判定可能なスケジューリング情報を前記第1の基地局を経由して受信する、請求項13に記載の移動通信システム。
- 第1の基地局、及び前記第1の基地局と移動局との間で無線中継を行う中継局とを備え、
前記第1の基地局は、 (i) 第1のフレームにおいて、前記中継局を経由して前記移動局に送信するための転送情報がエンコードされた第1の無線信号を送信するよう構成され、かつ (ii) 第2のフレームにおいて、複数のノードによって受信される第1のマルチキャスト情報がエンコードされた第2の無線信号を周辺基地局と同期した送信タイミングで送信するよう構成され、
前記中継局は、(i) 前記第1のフレームで送信される前記第1の無線信号を受信し、前記転送情報を前記第1の無線信号からデコードするとともに、前記転送情報がエンコードされた第3の無線信号を前記移動局に送信するよう構成され、
前記転送情報は、前記移動局宛てのユニキャスト情報を含み、前記送信タイミングでの同期送信が要求される前記マルチキャスト情報を含まない、
移動通信システム。 - 前記中継局は、前記送信タイミングにおいて、前記転送情報がエンコードされた無線信号の前記移動局への送信を停止するよう構成されている、請求項15に記載の移動通信システム。
- 前記中継局は、さらに、前記送信タイミングにおいて前記第1の基地局から送信される前記第2の無線信号を受信し、前記第2の無線信号から前記マルチキャスト情報をデコードすることなく前記第2の無線信号を増幅して再送信するよう構成されている、請求項15又は16に記載の移動通信システム。
- 前記中継局は、前記第1の基地局による前記第2の無線信号の送信タイミングを判定可能なスケジューリング情報を前記第1の基地局を経由して受信する、請求項16又は17に記載の移動通信システム。
- 第1の基地局と移動局との間で無線中継を行う中継局装置であって、
前記第1の基地局は、 (i) 第1のフレームにおいて、前記中継局装置を経由して前記移動局に送信するための転送情報がエンコードされた第1の無線信号を送信するよう構成され、かつ (ii) 第2のフレームにおいて、複数のノードによって受信される第1のマルチキャスト情報がエンコードされた第2の無線信号を周辺基地局と同期した送信タイミングで送信するよう構成され、
前記中継局装置は、
前記第1の無線信号を受信できるよう構成された第1の通信手段と、
前記第1の通信手段により受信された前記第1の無線信号から前記転送情報をデコードするとともに、前記転送情報が再エンコードされた第3の無線信号を生成することが可能なダウンリンクデータ処理手段と、
前記第3の無線信号を前記移動局に送信できるよう構成された第2の通信手段と、
を備え、
前記ダウンリンクデータ処理手段は、 (i)前記転送情報が前記移動局宛てのユニキャスト情報である場合に、前記ユニキャスト情報を前記第1の無線信号からデコードするとともに、(ii) 前記転送情報が、前記第1のマルチキャスト情報と同内容の第2のマルチキャスト情報である場合に、前記第2のマルチキャスト情報を前記第1の無線信号からデコードしないことができるよう構成されている、
中継局装置。 - 前記第2の通信手段は、前記送信タイミングにおいて、前記ユニキャスト情報がエンコードされた無線信号の前記移動局への送信を停止する、請求項19に記載の中継局装置。
- 前記第1の通信手段は、前記送信タイミングにおいて送信される前記第2の無線信号を受信できるよう構成され、
前記第2の通信手段は、前記第1のマルチキャスト情報を前記第2の無線信号からデコードする処理を経由することなく、前記第2の無線信号を増幅して再送信できるよう構成されている、請求項19又は20に記載の中継局装置。 - 前記第2の通信手段は、前記送信タイミングにおいて、前記第2の無線信号と同一の無線リソースを使用したダウンリンク送信を停止する、請求項19又は20に記載の中継局装置。
- 前記ダウンリンクデータ処理手段は、前記転送情報が前記第1のマルチキャスト情報と同内容の第2のマルチキャスト情報を含む場合に、前記送信タイミングに同期して送信可能であることを条件として、再エンコードされた前記第2のマルチキャスト情報を含む前記第3の無線信号を生成する、請求項19~22のいずれか1項に記載の中継局装置。
- 再エンコードされた前記第2のマルチキャスト情報を含む前記第3の無線信号を生成するか否かは、前記第1の無線信号からデコードされた前記第2のマルチキャスト情報の取得時刻から前記送信タイミングまでの猶予時間に基づいて決定される、請求項23に記載の中継局装置。
- 再エンコードされた前記第2のマルチキャスト情報を含む前記第3の無線信号は、前記猶予時間が所定の閾値を超える場合に生成される、請求項24に記載の中継局装置。
- 前記閾値は、前記第2のマルチキャスト情報に対する再エンコードを行って物理チャネルのビット列を生成し、前記ビット列に対する変調処理を行って前記第3の無線信号を生成するのに要する処理時間に応じて決定される、請求項25に記載の中継局装置。
- 前記第1の通信手段は、前記第1の基地局による前記第2の無線信号の送信タイミングを判定可能なスケジューリング情報を前記第1の基地局を経由して受信する、請求項19~26のいずれか1項に記載の中継局装置。
- 第1の基地局と移動局との間で無線中継を行う中継局であって、
前記移動局に送信するためのユニキャスト情報がエンコードされて前記第1の基地局から第1のフレームにおいて送信される第1の無線信号を受信でき、かつ、複数のノードによって受信されるマルチキャスト情報がエンコードされて前記第1の基地局から第2のフレームにおいて周辺基地局と同期した送信タイミングで送信される第2の無線信号を受信できるよう構成された第1の通信手段と、
前記第1の通信手段により受信された前記第1の無線信号から前記ユニキャスト情報をデコードするとともに、前記ユニキャスト情報が再エンコードされた第3の無線信号を生成することが可能なダウンリンクデータ処理手段と、
前記第3の無線信号を前記移動局に送信でき、かつ、前記マルチキャスト情報を前記第2の無線信号からデコードする処理を経由することなく前記第2の無線信号を増幅して再送信できるよう構成された第2の通信手段と、
を備える、中継局装置。 - 前記マルチキャスト情報は、3GPP(3rd Generation Partnership Project)で規定されているMBMS(Multimedia Broadcast multicast service)データ又はMBMSデータを含むMCH(Multicast Channel)である、請求項28に記載の中継局装置。
- (i) 第1のフレームにおいて、前記中継局を経由して前記移動局に送信するための転送情報がエンコードされた第1の無線信号を送信するよう構成され、かつ
(ii) 第2のフレームにおいて、複数のノードによって受信される第1のマルチキャスト情報がエンコードされた第2の無線信号を周辺基地局と同期した送信タイミングで送信するよう構成されており、
前記転送情報は、前記第1のマルチキャスト情報と同内容の第2のマルチキャスト情報を含み、
前記第2のマルチキャスト情報がエンコードされた前記第1の無線信号を、前記第1のマルチキャスト情報がエンコードされた第2の無線信号に比べて、前記中継局による前記第2のマルチキャスト情報の中継処理に要する遅延時間よりも長い猶予時間だけ早く送信する、
基地局装置。 - 第1の基地局と移動局との間で無線中継を行う中継局による無線中継方法であって、
前記第1の基地局は、 (i) 第1のフレームにおいて、前記中継局を経由して前記移動局に送信するための転送情報がエンコードされた第1の無線信号を送信するよう構成され、かつ (ii) 第2のフレームにおいて、複数のノードによって受信される第1のマルチキャスト情報がエンコードされた第2の無線信号を周辺基地局と同期した送信タイミングで送信するよう構成され、
前記方法は、
(a)前記第1の無線信号を受信すること、
(b)受信された前記第1の無線信号にエンコードされた前記転送情報が前記移動局宛てのユニキャスト情報である場合に、前記ユニキャスト情報をデコードするとともに、前記ユニキャスト情報が再エンコードされた第3の無線信号を生成すること、
(c)前記第1の無線信号にエンコードされた前記転送情報が前記第1のマルチキャスト情報と同内容の第2のマルチキャスト情報である場合に、前記第2のマルチキャスト情報を前記第1の無線信号からデコードしないこと、及び
(d)前記第3の無線信号を前記移動局に送信すること、
を備える、無線中継方法。 - 前記送信タイミングにおいて、前記ユニキャスト情報がエンコードされた無線信号の前記移動局への送信を停止することをさらに備える、請求項31に記載の方法。
- 前記送信タイミングにおいて前記第1の基地局から送信される前記第2の無線信号を受信すること、及び
前記第2の無線信号から前記第1のマルチキャスト情報をデコードすることなく前記第2の無線信号を増幅して再送信すること、
をさらに備える、請求項31又は32に記載の方法。 - 前記送信タイミングにおいて、前記第2の無線信号と同一の無線リソースを使用したダウンリンク送信を停止することをさらに備える、請求項31又は32に記載の方法。
- 前記第1の無線信号からデコードされた前記第2のマルチキャスト情報を再エンコードすることで生成される前記第3の無線信号を前記移動局に送信するか否かを、前記送信タイミングに同期して送信できるか否かによって決定すること、及び
前記送信タイミングに同期して送信可能であることを条件として、再エンコードされた前記第2のマルチキャスト情報を含む前記第3の無線信号を生成すること、
をさらに備える、請求項31~34のいずれか1項に記載の方法。 - 第1の基地局と移動局との間で無線中継を行う中継局における無線中継方法であって、
(a)前記移動局に送信するためのユニキャスト情報がエンコードされて前記第1の基地局から第1のフレームにおいて送信される第1の無線信号を受信すること、
(b)受信された前記第1の無線信号から前記ユニキャスト情報をデコードするとともに、前記ユニキャスト情報が再エンコードされた第3の無線信号を生成すること、
(c)前記第3の無線信号を前記移動局に送信すること、
(d)複数のノードによって受信されるマルチキャスト情報がエンコードされて前記第1の基地局から第2のフレームにおいて周辺基地局と同期した送信タイミングで送信される第2の無線信号を受信すること、及び
(e)前記マルチキャスト情報を前記第2の無線信号からデコードする処理を経由することなく前記第2の無線信号を増幅して再送信すること、
を備える、無線中継方法。 - 第1の基地局と移動局との間で無線中継を行う中継局に関する信号処理をコンピュータに実行させるためのプログラムが格納された非一時的なコンピュータ可読媒体であって、
前記第1の基地局は、 (i) 第1のフレームにおいて、前記中継局装置を経由して前記移動局に送信するための転送情報がエンコードされた第1の無線信号を送信するよう構成され、かつ (ii) 第2のフレームにおいて、複数のノードによって受信される第1のマルチキャスト情報がエンコードされた第2の無線信号を周辺基地局と同期した送信タイミングで送信するよう構成され、
前記信号処理は、
(a)前記中継局によって受信された前記第1の無線信号にエンコードされた前記転送情報が前記移動局宛てのユニキャスト情報である場合に、前記ユニキャスト情報をデコードするとともに、前記ユニキャスト情報が再エンコードされたデジタル送信信号を生成すること、及び
(b)前記第1の無線信号にエンコードされた前記転送情報が前記第1のマルチキャスト情報と同内容の第2のマルチキャスト情報である場合に、前記第2のマルチキャスト情報をデコードしないこと、
を備える、コンピュータ可読媒体。
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WO2015005684A1 (ko) * | 2013-07-10 | 2015-01-15 | 주식회사 케이티 | 무선랜 시스템에서 데이터 전송 방법 및 장치 |
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US8811257B2 (en) | 2014-08-19 |
EP2496004A4 (en) | 2014-03-12 |
JPWO2011052135A1 (ja) | 2013-03-14 |
EP2496004B1 (en) | 2016-03-02 |
CN102598753B (zh) | 2015-04-29 |
JP5565416B2 (ja) | 2014-08-06 |
KR101385695B1 (ko) | 2014-04-17 |
US20120213145A1 (en) | 2012-08-23 |
KR20120080209A (ko) | 2012-07-16 |
CN102598753A (zh) | 2012-07-18 |
EP2496004A1 (en) | 2012-09-05 |
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