WO2011031080A2 - 릴레이 시스템에서 통신을 수행하는 방법 및 장치 - Google Patents
릴레이 시스템에서 통신을 수행하는 방법 및 장치 Download PDFInfo
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- WO2011031080A2 WO2011031080A2 PCT/KR2010/006150 KR2010006150W WO2011031080A2 WO 2011031080 A2 WO2011031080 A2 WO 2011031080A2 KR 2010006150 W KR2010006150 W KR 2010006150W WO 2011031080 A2 WO2011031080 A2 WO 2011031080A2
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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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
- H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method and an apparatus therefor for efficiently using communication resources in a relay system.
- Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data.
- a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
- multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA).
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division multiple access
- MCD division multiple access
- MCDMA multi-carrier frequency division multiple access
- MC-FDMA multi-carrier frequency division multiple access
- a method for controlling uplink signal transmission of a terminal in a wireless communication system comprising: identifying a cell-specific first sounding reference signal (SRS) transmission subframe set; Identifying a relay-specific second SRS transmission subframe set; And a resource allocation step for transmitting the uplink signal, and when the backhaul subframe belongs to the first SRS transmission subframe set but does not belong to the second SRS transmission subframe set, the uplink signal is the backhaul. Transmitted to the relay through a subframe, and when the backhaul subframe belongs to the second SRS transmission subframe set, transmission of the uplink signal is dropped in the backhaul subframe.
- SRS cell-specific first sounding reference signal
- a radio frequency (RF) unit comprising: Memory; And a processor, the processor identifying a cell-specific first Sounding Reference Signal (SRS) transmission subframe set, identifying a relay-specific second SRS transmission subframe set, and the uplink Configured to allocate resources for signal transmission, and if the backhaul subframe belongs to the first SRS transmission subframe set but does not belong to the second SRS transmission subframe set, the uplink signal is transmitted through the backhaul subframe. If a backhaul subframe belongs to the second set of SRS transmission subframes and is transmitted to a relay, the transmission of the uplink signal is dropped in the backhaul subframe.
- SRS Sounding Reference Signal
- the uplink signal may include ACK / NACK (acknowledgement / negative ACK) or SRS.
- the uplink signal may be transmitted to the relay through a time interval behind the backhaul subframe.
- the uplink signal may include an SRS period of the backhaul subframe.
- a method for controlling signal transmission and reception of a relay in a wireless communication system comprising: identifying a cell-specific first sounding reference signal (SRS) transmission subframe set; And identifying a relay-specific second SRS transmission subframe set, wherein the backhaul subframe belongs to the first SRS transmission subframe set but does not belong to the second SRS transmission subframe set.
- SRS cell-specific first sounding reference signal
- a signal transmission and reception control method is provided for receiving a signal from a terminal through a frame and transmitting an SRS signal to a base station through the backhaul subframe when the backhaul subframe belongs to the second set of SRS transmission subframes.
- a radio frequency (RF) unit comprising: Memory; And a processor, wherein the processor is configured to identify a cell-specific first sounding reference signal (SRS) transmission subframe set, and to identify a relay-specific second SRS transmission subframe set, and backhaul.
- SRS cell-specific first sounding reference signal
- a signal is received from the terminal through the backhaul subframe, and a backhaul subframe is the second SRS transmission subframe.
- a relay for use in a wireless communication system is provided in which an SRS signal is transmitted to a base station via the backhaul subframe.
- the signal received from the terminal may include ACK / NACK (acknowledgement / negative ACK) or SRS.
- the uplink signal may be transmitted to the relay through a time interval behind the backhaul subframe.
- the uplink signal may include an SRS period of the backhaul subframe.
- the backhaul subframe when the backhaul subframe belongs to the first SRS transmission subframe set but does not belong to the second SRS transmission subframe set, it may include switching from a backhaul link to an access link within the backhaul subframe. have.
- the signal on the backhaul link may be transmitted to the base station using a shortened subframe format.
- E-UMTS Evolved Universal Mobile Telecommunications System
- FIG. 2 illustrates a structure of a radio frame of a 3GPP system.
- FIG. 3 illustrates a resource grid for a downlink slot.
- FIG. 4 illustrates a structure of a downlink subframe.
- FIG. 5 illustrates a structure of an uplink subframe used in a system.
- FIG. 6 illustrates a wireless communication system including a relay.
- FIG. 7 illustrates a communication process using a backhaul link and an access link.
- FIG 8 to 10 illustrate a case in which a backhaul subframe is divided based on a symbol in the time domain according to an embodiment of the present invention.
- FIG. 11 shows an example of setting a subframe in which TDM partitioning is performed according to an embodiment of the present invention.
- FIG. 12 illustrates a base station, a relay, and a terminal to which the present invention can be applied.
- Embodiments of the present invention may be used in various radio access technologies such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, MC-FDMA.
- CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
- TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile communications
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), and the like.
- UTRA is part of the Universal Mobile Telecommunications System (UMTS).
- 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA.
- LTE-A Advanced is an evolution of 3GPP LTE.
- E-UMTS is also called LTE system.
- Communication networks are widely deployed to provide various communication services such as voice and packet data.
- the E-UMTS network includes an Evolved Universal Terrestrial Radio Access Network (E-UTRAN), an Evolved Packet Core (EPC), and a user equipment (UE).
- the E-UTRAN may include one or more base stations (eNode Bs) 20 and one or more terminals 10 may be located in one cell.
- the mobility management entity / system structure evolution (MME / SAE) gateway 30 may be located at a network end and connected to an external network. Downlink refers to communication from the base station 20 to the terminal 10 and uplink refers to communication from the terminal to the base station.
- the terminal 10 is a communication device carried by a user, and the base station 20 is generally a fixed station that communicates with the terminal 10.
- the base station 20 provides the terminal 10 with end points of the user plane and the control plane.
- One base station 20 may be arranged per cell.
- An interface for transmitting user traffic or control traffic may be used between the base stations 20.
- the MME / SAE gateway 30 provides an endpoint of the session and mobility management function to the terminal 10.
- the base station 20 and the MME / SAE gateway 30 may be connected through an S1 interface.
- the MME provides a variety of functions including distribution of paging messages to base stations 20, security control, dormant mobility control, SAE bearer control, and encryption and integrity protection of non-access layer (NAS) signaling.
- the SAE gateway host provides various functions including end of plane packets and user plane switching for terminal 10 mobility support.
- MME / SAE gateway 30 is referred to herein simply as gateway. However, MME / SAE gateway 30 includes both MME and SAE gateways.
- a plurality of nodes may be connected between the base station 20 and the gateway 30 through the S1 interface.
- Base stations 20 may be interconnected via an X2 interface and neighboring base stations may have a mesh network structure having an X2 interface.
- FIG. 2 illustrates a structure of a radio frame used in a 3GPP system.
- a radio frame has a length of 10 ms (327200 ⁇ T s ) and consists of 10 equally sized subframes.
- Each subframe has a length of 1 ms and consists of two slots.
- Each slot has a length of 0.5 ms (15360 x T s ).
- the slot includes a plurality of OFDM or SC-FDMA symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
- one resource block includes 12 subcarriers x 7 (6) OFDM or SC-FDMA symbols.
- a transmission time interval which is a unit time in which data is transmitted, may be determined by one or more subframes.
- the structure of the above-described radio frame is only an example, and the number of subframes or subslots and the number of OFDM / SC-FDMA symbols in the radio frame may be variously changed.
- FIG. 3 illustrates a resource grid for a downlink slot.
- the downlink slot includes a plurality of (eg, seven) OFDM symbols in the time domain and N DL RB resource blocks in the frequency domain. Since each resource block includes 12 subcarriers, the downlink slot includes N DL RB ⁇ 12 subcarriers in the frequency domain. 3 illustrates that the downlink slot includes 7 OFDM symbols and the resource block includes 12 subcarriers, but is not limited thereto.
- the number of OFDM symbols included in the downlink slot may be modified according to the length of a cyclic prefix (CP).
- CP cyclic prefix
- Each element on the resource grid is called a resource element (RE).
- the RE is a minimum time / frequency resource defined in a physical channel, indicated by one OFDM symbol index and one subcarrier index.
- One resource block is composed of N DL RB x N RB sc REs.
- N DL symb is the number of OFDM symbols included in the downlink slot and
- N RB sc is the number of subcarriers included in the resource block.
- the number N DL RB of resource blocks included in the downlink slot depends on a downlink transmission bandwidth set in a cell.
- the downlink slot structure illustrated in FIG. 3 is equally applied to the uplink slot structure.
- the uplink slot structure includes an SC-FDMA symbol instead of an OFDM symbol.
- FIG. 4 illustrates a structure of a downlink subframe used in a 3GPP system.
- At least one OFDM symbol is used as a control region from the beginning of a subframe and the remaining OFDM symbols are used as a data region.
- the size of the control region may be set independently for each subframe.
- the control region is used to transmit scheduling information and other L1 / L2 (layer 1 / layer 2) control information.
- the data area is used to carry traffic.
- the control channel includes a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid-automatic Repeat Request (ARQ) Indicator CHannel (PHICH), and a Physical Downlink Control CHannel (PDCCH).
- the traffic channel includes a Physical Downlink Shared CHannel (PDSCH).
- the PDCCH informs each UE or UE group of information related to resource allocation of a paging channel (PCH) and a downlink-shared channel (DL-SCH), an uplink scheduling grant, and HARQ information.
- Paging channel (PCH) and downlink-shared channel (DL-SCH) are transmitted through PDSCH. Accordingly, the base station and the terminal generally transmit and receive data through the PDSCH except for specific control information or specific service data.
- Control information transmitted through the PDCCH is called downlink control information (DCI).
- DCI indicates uplink resource allocation information, downlink resource allocation information, and uplink transmission power control command for arbitrary UE groups.
- the base station determines the PDCCH format according to the DCI to be sent to the terminal, and attaches a CRC (Cyclic Redundancy Check) to the control information.
- a CRC Cyclic Redundancy Check
- a unique identifier eg, a Radio Network Temporary Identifier (RNTI)
- RNTI Radio Network Temporary Identifier
- FIG. 5 illustrates a structure of an uplink subframe used in a 3GPP system.
- a subframe 500 having a length of 1 ms which is a basic unit of LTE uplink transmission, is composed of two 0.5 ms slots 501. Assuming the length of a normal cyclic prefix (CP), each slot is composed of seven symbols 502 and one symbol corresponds to one SC-FDMA symbol.
- the resource block (RB) 503 is a resource allocation unit corresponding to 12 subcarriers in the frequency domain and one slot in the time domain.
- the structure of the uplink subframe of LTE is largely divided into a data region 504 and a control region 505.
- the data area means a communication resource used in transmitting data such as voice and packet transmitted to each terminal, and includes a PUSCH (Physical Uplink Shared Channel).
- PUSCH Physical Uplink Shared Channel
- the control region means a communication resource used to transmit an uplink control signal, for example, a downlink channel quality report from each terminal, a received ACK / NACK for the downlink signal, an uplink scheduling request, and a PUCCH (Physical Uplink). Control Channel).
- the sounding reference signal (SRS) is transmitted through an SC-FDMA symbol located last on the time axis in one subframe. SRSs of multiple terminals transmitted in the last SC-FDMA of the same subframe can be distinguished according to frequency location / sequence.
- a wireless communication system includes a base station, a relay, and a terminal.
- the terminal communicates with the base station or the relay.
- a terminal communicating with a base station is referred to as a macro UE
- a terminal communicating with a relay is referred to as a relay UE.
- the communication link between the base station and the macro terminal is referred to as a macro access link
- the communication link between the relay and the relay terminal is referred to as a relay access link.
- the communication link between the base station and the relay is referred to as a backhaul link.
- L1 layer 1 relays
- L2 layer 2 relays
- L3 layer 3 relays according to how much they perform in multi-hop transmission.
- the L1 relay normally performs the function of a repeater and simply amplifies the signal from the base station / terminal and transmits it to the terminal / base station. Since the relay does not perform decoding, the transmission delay is short, but the signal and noise cannot be distinguished, and thus the noise is amplified. To compensate for this drawback, advanced repeaters (advanced repeaters or smart repeaters) with features such as UL power control or self-interference cancellation may be used.
- the operation of the L2 relay may be represented as decode-and-forward and may transmit user plane traffic to L2.
- L3 relays also known as self-backhauling, can send IP packets to L3. It also includes Radio Resource Control (RRC) functionality, which acts like a small base station.
- RRC Radio Resource Control
- the L1 and L2 relays may be described as a case where the relay is part of a donor cell covered by the corresponding base station.
- the relay cannot have its own cell ID because the relay does not control the cell of the relay itself and the terminals of the cell.
- the relay ID which is an ID of the relay, may have a relay ID.
- some functions of RRM (Radio Resource Management) are controlled by the base station of the donor cell, and a part of the RRM may be located in the relay.
- the L3 relay is a case in which the relay can control its own cell.
- the relay may manage one or more cells, and each cell managed by the relay may have a unique physical-layer cell ID. It may have the same RRM mechanism as the base station, and from the terminal's point of view, there is no difference between connecting to a cell managed by a relay or a cell managed by a general base station.
- relays are classified as follows according to mobility.
- Fixed RN permanently fixed and used to increase shadow area or cell coverage.
- the function of a simple repeater is also possible.
- Nomadic RN A relay that can be temporarily installed when the user suddenly increases or can be moved arbitrarily within a building.
- Mobile RN Relays that can be mounted on public transport such as buses or subways.
- In-band connection The network-to-relay link and the network-to-end link in the donor cell share the same frequency band.
- Out-band connection The network-to-relay link and the network-to-terminal link in the donor cell use different frequency bands.
- Transparent relay The terminal cannot know that communication with the network is performed through the relay.
- Non-transparent relay The terminal knows that communication with the network is performed through the relay.
- the backhaul link and the access link operate in a half-duplex manner.
- the backhaul link and the access link are not simultaneously activated in the same transmission time interval (TTI).
- TTI transmission time interval
- the TTI is defined in units of subframes, only one of a backhaul link or an access link is activated in units of subframes.
- the relay if there is uplink backhaul subframe transmission (702), the relay cannot receive the PUCCH and the PUSCH from the relay terminal through the same subframe timing (S704). Similarly, when the relay receives the PUCCH and the PUSCH from the relay terminal (S706), the relay cannot transmit an uplink backhaul subframe to the base station (S708).
- This half-duplex operation places severe restrictions on the subframe resources available for the backhaul link and the access link.
- the resource limitation may not be a problem since the base station controls transmission and reception of an access signal in consideration of a backhaul subframe.
- Non-scheduled signals may be implied by downlink transmission, e.g., control information (e.g., SRS, Precoding Matrix Index (PMI), rank indicator (RI), channel quality indicator (CQI), etc.) or transmission timing transmitted periodically. (implicitly) includes an uplink ACK / NACK signal linked to. In detail, the relay may not receive the dynamic ACK / NACK on the access link in the subframe allocated to the backhaul subframe.
- control information e.g., SRS, Precoding Matrix Index (PMI), rank indicator (RI), channel quality indicator (CQI), etc.
- ACK / NACK for the access link may be lost in the corresponding backhaul subframe, thereby lowering the throughput of the system.
- DTX Continuous Transmission
- latency may also increase because retransmission occurs.
- the present invention proposes to use TDM partitioning of more granularity in the communication link.
- the granularity of TDM partitioning for a communication link may be defined in units of time (eg, based on sampling time (Ts), symbols, or slots) that are smaller than a TTI (eg, subframe).
- Ts sampling time
- symbols, or slots e.g, symbols
- the present invention can be applied without limitation to a backhaul link, an access link or a backhaul link / access link.
- the TTI or subframe to which the dense granularity TDM according to the present invention is applied may be a special TTI or subframe signaled or previously promised by a network (eg, a base station or a relay).
- Special subframes include, but are not limited to, backhaul subframes.
- a special subframe in this case, a backhaul subframe may be configured using signaling regarding the MBSFN subframe.
- FIG 8 illustrates a case in which a backhaul subframe is divided based on a symbol in the time domain according to an embodiment of the present invention.
- a backhaul subframe may be divided into an access link A, a backhaul link B, and an access link C in the time domain. Accordingly, the terminal and the relay may transmit and receive a radio signal using the time period A in which the access link is activated (S802). Similarly, the terminal and the relay may transmit and receive a radio signal using the time interval C in which the access link is activated (S806).
- the corresponding subframe is set as the backhaul subframe, the backhaul link between the relay and the base station is inactive in the time periods A and C.
- the time interval B in which the backhaul link is activated is used to transmit and receive the backhaul link signal by the relay and the base station according to the original configuration of the corresponding subframe (S804).
- the time domain division of the backhaul subframe illustrated in FIG. 8 is an example, and the order / length / number of sections for the access link and the backhaul link may be variously modified.
- FIG. 8 illustrates a case where transmission and reception are performed in all three time periods A, B, and C divided from one subframe. However, this is an illustrative example, and each of the time periods A, B, and C may be activated / deactivated independently of each other.
- Non-scheduled signals include signals where periodic transmission or event-based transmission is performed.
- the non-scheduled signal includes, but is not limited to, a channel measurement signal (eg, SRS), an uplink control signal (eg, CQI, PMI, RI, SR (Scheduling Request), ACK / NACK).
- FIG 9 illustrates a case in which a backhaul subframe is divided based on a symbol in the time domain according to another embodiment of the present invention.
- a backhaul subframe may be divided into a backhaul link A and an access link B and S in the time domain. Therefore, the terminal and the relay may transmit and receive a radio signal using the time intervals B and S in which the access link is activated (S904).
- the time interval S may be defined as a last symbol of a subframe in consideration of compatibility with the existing LTE system as a transmission interval for the SRS. Therefore, according to this embodiment, even though the corresponding subframe is set as the backhaul subframe, the backhaul link between the relay and the base station is inactive in the time periods A and S.
- the time interval A in which the backhaul link is activated is used to transmit and receive the backhaul link signal by the relay and the base station according to the original configuration of the corresponding subframe (S902).
- the time domain division of the backhaul subframe illustrated in FIG. 9 may be variously modified in order / length / number of sections for the access link and the backhaul link.
- FIG. 9 illustrates a case where transmission and reception are performed in all three time periods A, B, and S divided from one subframe. However, this is an illustrative example, and each of the time periods A, B, and S may be activated / deactivated independently of each other.
- FIG. 10 illustrates a case in which a backhaul subframe is divided based on a symbol in the time domain according to another embodiment of the present invention.
- a backhaul subframe may be divided into a backhaul link B and an access link S in the time domain.
- the terminal and the relay may transmit and receive a radio signal using the time interval S in which the access link is activated (S1004).
- the time interval S may be defined as a last symbol of a subframe as a transmission interval for the SRS. That is, according to the present embodiment, one transmission / reception switching is allowed in symbol units in the backhaul subframe.
- the relay can also receive the SRS from the terminal through the backhaul subframe. Instead, all remaining symbols in the backhaul subframe are used for backhaul transmission.
- the corresponding subframe is set as the backhaul subframe
- the backhaul link between the relay and the base station is deactivated in the time period S.
- the time interval B in which the backhaul link is activated is used to transmit and receive the backhaul link signal between the relay and the base station according to the original configuration of the corresponding subframe (S1002).
- the time domain division of the backhaul subframe illustrated in FIG. 10 is an example, and the order / length / number of sections for the access link and the backhaul link may be variously modified.
- FIG. 10 illustrates a case where transmission / reception is performed in both time periods B and S divided from one subframe. However, this is for illustrative purposes, and each time period B and S may be activated / deactivated independently of each other.
- signaling information for configuring TDM partitioning with a finer granularity in the backhaul subframe may be needed.
- Signaling information for configuring TDM partitioning of the present invention may be newly defined.
- the signaling information may inform the semi-static TDM partitioning configuration in the backhaul subframe using higher layer signaling (eg, RRC signaling).
- TDM partitioning according to the present invention can be applied without limitation to all non-scheduled signals.
- the TDM partitioning according to the present invention may be limitedly used only for certain non-scheduled signals (eg, SRS, ACK / NACK) in order to minimize the influence on the existing backhaul subframe.
- TDM partitioning according to the present invention may be activated only in a backhaul subframe in which a specific non-scheduled signal (eg, SRS, ACK / NACK) is transmitted.
- configuration information for TDM partitioning is transmitted through the above-described upper layer signaling, but whether to apply TDM partitioning actually means that the network node (e.g., base station, relay) has lower layer signaling (e.g., MAC signaling) in consideration of the system situation. , PDCCH signaling) may be considered.
- SRS transmission is configured by cell-specific transmission parameters and UE-specific transmission parameters.
- the backhaul SRS transmission is also the same / similar to that of LTE in cell-specific SRS transmission parameters and UE-specific SRS transmission parameters (or referred to as relay-specific SRS transmission parameters). It can be configured by.
- Table 1 shows cell-specific SRS transmission parameters for SRS transmission defined in LTE
- Table 2 shows terminal-specific SRS transmission parameters for SRS transmission defined in LTE.
- Table 1 srs-SubframeConfig Binary Configuration PeriodT SFC (subframes) Transmission offset ⁇ SFC (subframes) 0 0000 One ⁇ 0 ⁇ One 0001 2 ⁇ 0 ⁇ 2 0010 2 ⁇ One ⁇ 3 0011 5 ⁇ 0 ⁇ 4 0100 5 ⁇ One ⁇ 5 0101 5 ⁇ 2 ⁇ 6 0110 5 ⁇ 3 ⁇ 7 0111 5 ⁇ 0,1 ⁇ 8 1000 5 ⁇ 2,3 ⁇ 9 1001 10 ⁇ 0 ⁇ 10 1010 10 ⁇ One ⁇ 11 1011 10 ⁇ 2 ⁇ 12 1100 10 ⁇ 3 ⁇ 13 1101 10 ⁇ 0,1,2,3,4,6,8 ⁇ 14 1110 10 ⁇ 0,1,2,3,4,5,6,8 ⁇ 15 1111 reserved reserved
- T SFC represents a cell-specific subframe configuration
- ⁇ SFC represents a cell-specific subframe offset
- srs-SubframeConfig is provided by higher layers.
- SRS is transmitted on a subframe satisfying floor (n S / 2) mod T SFC ⁇ ⁇ SFC .
- n S represents a slot index.
- floor () represents a flooring function, and mod represents a modulo operation.
- the SRS configuration index (I SRS ) is signaled for each terminal, and each terminal checks the SRS transmission period (T SRS ) and the SRS subframe offset (T offset ) using the I SRS .
- the cell-specific SRS transmission parameter informs the relay / terminal of the subframe occupied for SRS transmission in the cell, and the terminal-specific SRS transmission parameter indicates the subframe actually used by the relay / terminal among the subframes occupied for SRS. Inform. Thereafter, the relay / terminal transmits the SRS through a specific symbol (eg, the last symbol) of the subframe designated by the relay / terminal-specific SRS transmission parameter. Meanwhile, in order to protect the SRS transmission in the subframe occupied by the cell-specific SRS transmission parameter, the relay / terminal transmits an uplink signal through the last symbol of the subframe regardless of whether or not the subframe is actually transmitting the SRS. It is necessary not to transmit.
- a specific symbol eg, the last symbol
- the relay is referred to as another relay /
- the switching method illustrated in FIG. 10 may be applied without newly defining signaling information for configuring TDM partitioning.
- uplink control signals eg, ACK / NACK, SR
- some uplink control signals eg, ACK / NACK, SR
- PUCCH and SRS for ACK / NACK are configured in the same subframe
- two options of simultaneous PUCCH / SRS transmission and SRS transmission drop are possible.
- LTE transmits ackNackSrsSimultaneousTransmission via RRC signaling. If AckNackSrsSimultaneousTransmission is ON, simultaneous PUCCH / SRS transmission is allowed, otherwise SRS is dropped.
- the present invention shows that only simultaneous transmission of PUCCH and SRS, preferably simultaneous transmission of PUCCH and SRS for ACK / NACK, is allowed through higher layer signaling (eg, RRC signaling).
- higher layer signaling eg, RRC signaling
- the switching method exemplified with reference to may be applied to the special subframe described above.
- uplink control information is transmitted using a shortened subframe format (or short PUCCH format).
- FIG. 11 shows an example of setting a subframe in which TDM partitioning is performed according to an embodiment of the present invention.
- the cell-specific SRS subframe 1102 is set at two subframe intervals starting from subframe 0.
- the UE-specific SRS subframe 1104 is set at 10 subframe intervals starting from subframe 0.
- the UE-specific SRS subframe indicates an SRS transmission subframe configured for the relay.
- the relay must transmit its own backhaul SRS in the UE-specific SRS subframe.
- the UE-specific SRS subframes among the backhaul subframes may be excluded for the purpose of TDM partitioning. That is, the UE-specific SRS subframe among the backhaul subframes may be excluded from the purpose of receiving an access link signal (eg, non-scheduled signal: ACK / NACK, SRS, etc.).
- an access link signal eg, non-scheduled signal: ACK / NACK, SRS, etc.
- an access link signal (eg, non-scheduled signal: ACK / NACK, SRS, etc.) can be received through TDM partitioning.
- a backhaul subframe eg, non-scheduled signal: ACK / NACK, SRS, etc.
- a resource or channel for an uplink signal
- the UE sends a signal to the relay through the backhaul subframe ( For example, a non-scheduled signal: ACK / NACK, SRS, etc.) may be transmitted.
- the UE may drop signal transmission from the backhaul subframe to the relay.
- FIG. 12 illustrates a base station, a relay, and a terminal applicable to the present invention.
- a wireless communication system includes a base station (BS) 110, a relay (RN, 130), and a terminal (UE) 130.
- the transmitter is part of the base station 110 and the receiver is part of the relay 120.
- the transmitter is part of the relay 120 and the receiver is part of the base station 110.
- the transmitter is part of the base station 110 or the relay 120
- the access uplink the transmitter is part of the terminal 130 and the receiver is part of the base station 110 or the relay 120.
- a link is formed between the base station 110 and the terminal 130
- a link is formed between the relay 120 and the terminal 130.
- Base station 110 includes a processor 112, a memory 114, and a radio frequency (RF) unit 116.
- the processor 112 may be configured to implement the procedures and / or methods proposed in the present invention.
- the memory 114 is connected to the processor 112 and stores various information related to the operation of the processor 112.
- the RF unit 116 is connected with the processor 112 and transmits and / or receives a radio signal.
- the relay 120 includes a processor 122, a memory 124, and a radio frequency unit 126.
- the processor 122 may be configured to implement the procedures and / or methods proposed by the present invention.
- the memory 124 is connected with the processor 122 and stores various information related to the operation of the processor 122.
- the RF unit 126 is connected with the processor 122 and transmits and / or receives a radio signal.
- the terminal 130 includes a processor 132, a memory 134, and an RF unit 136.
- the processor 132 may be configured to implement the procedures and / or methods proposed in the present invention.
- the memory 134 is connected to the processor 132 and stores various information related to the operation of the processor 132.
- the RF unit 136 is connected with the processor 132 and transmits and / or receives a radio signal.
- the base station 110, the relay 120, and / or the terminal 130 may have a single antenna or multiple antennas.
- each component or feature is to be considered optional unless stated otherwise.
- Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
- the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
- embodiments of the present invention have been mainly described based on data transmission / reception relations between a terminal, a relay, and a base station.
- Certain operations described in this document as being performed by a base station may in some cases be performed by an upper node thereof. That is, it is obvious that various operations performed for communication with the terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
- a base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like.
- the terminal may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), and the like.
- Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
- an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs field programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
- the software code may be stored in a memory unit and driven by a processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
- the present invention relates to a wireless communication system, and in particular, may be applied to a wireless communication system including a relay.
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Abstract
Description
| srs-SubframeConfig | Binary | Configuration PeriodTSFC (subframes) | Transmission offset △SFC (subframes) |
| 0 | 0000 | 1 | {0} |
| 1 | 0001 | 2 | {0} |
| 2 | 0010 | 2 | {1} |
| 3 | 0011 | 5 | {0} |
| 4 | 0100 | 5 | {1} |
| 5 | 0101 | 5 | {2} |
| 6 | 0110 | 5 | {3} |
| 7 | 0111 | 5 | {0,1} |
| 8 | 1000 | 5 | {2,3} |
| 9 | 1001 | 10 | {0} |
| 10 | 1010 | 10 | {1} |
| 11 | 1011 | 10 | {2} |
| 12 | 1100 | 10 | {3} |
| 13 | 1101 | 10 | {0,1,2,3,4,6,8} |
| 14 | 1110 | 10 | {0,1,2,3,4,5,6,8} |
| 15 | 1111 | reserved | reserved |
| SRS Configuration IndexISRS | SRS Periodicity TSRS (ms) | SRS Subframe Offset Toffset |
| 0 - 1 | 2 | ISRS |
| 2 - 6 | 5 | ISRS - 2 |
| 7 - 16 | 10 | ISRS - 7 |
| 17 - 36 | 20 | ISRS - 17 |
| 37 - 76 | 40 | ISRS - 37 |
| 77 - 156 | 80 | ISRS - 77 |
| 157 - 316 | 160 | ISRS- 157 |
| 317 - 636 | 320 | ISRS - 317 |
| 637 - 1023 | reserved | reserved |
Claims (20)
- 무선 통신 시스템에서 단말의 상향링크 신호 전송 제어 방법에 있어서,셀-특정(cell-specific) 제1 SRS(Sounding Reference Signal) 전송 서브프레임 세트를 확인하는 단계;릴레이-특정 제2 SRS 전송 서브프레임 세트를 확인하는 단계; 및상기 상향링크 신호 전송을 위한 자원 할당 단계를 포함하고,백홀 서브프레임이 상기 제1 SRS 전송 서브프레임 세트에 속하지만 상기 제2 SRS 전송 서브프레임 세트에는 속하지 않는 경우, 상기 상향링크 신호는 상기 백홀 서브프레임을 통해 상기 릴레이에게 전송되고,백홀 서브프레임이 상기 제2 SRS 전송 서브프레임 세트에 속하는 경우, 상기 상향링크 신호의 전송은 상기 백홀 서브프레임에서 드롭(drop)되는, 상향링크 신호 전송 제어 방법.
- 제1항에 있어서,상기 상향링크 신호는 ACK/NACK (acknowledgement/negative ACK) 또는 SRS를 포함하는 것을 특징으로 하는, 상향링크 신호 전송 제어 방법.
- 제1항에 있어서,상기 상향링크 신호는 상기 백홀 서브프레임의 뒤쪽 시구간을 통해 상기 릴레이에게 전송되는 것을 특징으로 하는, 상향링크 신호 전송 제어 방법.
- 제3항에 있어서,상기 상향링크 신호는 상기 백홀 서브프레임의 SRS 구간을 포함하는 것을 특징으로 하는, 상향링크 신호 전송 제어 방법.
- RF(Radio Frequency) 유닛;메모리; 및프로세서를 포함하고,상기 프로세서는 셀-특정(cell-specific) 제1 SRS(Sounding Reference Signal) 전송 서브프레임 세트를 확인하고, 릴레이-특정 제2 SRS 전송 서브프레임 세트를 확인하며, 상기 상향링크 신호 전송을 위한 자원 할당하도록 구성되고,백홀 서브프레임이 상기 제1 SRS 전송 서브프레임 세트에 속하지만 상기 제2 SRS 전송 서브프레임 세트에는 속하지 않는 경우, 상기 상향링크 신호는 상기 백홀 서브프레임을 통해 상기 릴레이에게 전송되고,백홀 서브프레임이 상기 제2 SRS 전송 서브프레임 세트에 속하는 경우, 상기 상향링크 신호의 전송은 상기 백홀 서브프레임에서 드롭(drop)되는, 무선 통신 시스템에 사용되는 단말.
- 제5항에 있어서,상기 상향링크 신호는 ACK/NACK (acknowledgement/negative ACK) 또는 SRS를 포함하는 것을 특징으로 하는, 단말.
- 제5항에 있어서,상기 상향링크 신호는 상기 백홀 서브프레임의 뒤쪽 시구간을 통해 상기 릴레이에게 전송되는 것을 특징으로 하는, 단말.
- 제7항에 있어서,상기 상향링크 신호는 상기 백홀 서브프레임의 SRS 구간을 포함하는 것을 특징으로 하는, 단말.
- 무선 통신 시스템에서 릴레이의 신호 송수신 제어 방법에 있어서,셀-특정(cell-specific) 제1 SRS(Sounding Reference Signal) 전송 서브프레임 세트를 확인하는 단계; 및릴레이-특정 제2 SRS 전송 서브프레임 세트를 확인하는 단계를 포함하고,백홀 서브프레임이 상기 제1 SRS 전송 서브프레임 세트에 속하지만 상기 제2 SRS 전송 서브프레임 세트에는 속하지 않는 경우, 상기 백홀 서브프레임을 통해 단말로부터 신호를 수신하고,백홀 서브프레임이 상기 제2 SRS 전송 서브프레임 세트에 속하는 경우, 상기 백홀 서브프레임을 통해 기지국으로 SRS 신호를 전송하는, 신호 송수신 제어 방법.
- 제9항에 있어서,상기 단말로부터 수신하는 신호는 ACK/NACK (acknowledgement/negative ACK) 또는 SRS를 포함하는 것을 특징으로 하는, 신호 송수신 제어 방법.
- 제9항에 있어서,상기 상향링크 신호는 상기 백홀 서브프레임의 뒤쪽 시구간을 통해 상기 릴레이에게 전송되는 것을 특징으로 하는, 신호 송수신 제어 방법.
- 제11항에 있어서,상기 상향링크 신호는 상기 백홀 서브프레임의 SRS 구간을 포함하는 것을 특징으로 하는, 신호 송수신 제어 방법.
- 제9항에 있어서,상기 백홀 서브프레임이 상기 제1 SRS 전송 서브프레임 세트에 속하지만 상기 제2 SRS 전송 서브프레임 세트에는 속하지 않는 경우,상기 백홀 서브프레임 내에서 백홀 링크로부터 억세스 링크로 스위칭 하는 것을 포함하는 것을 특징으로 하는, 신호 송수신 제어 방법.
- 제13항에 있어서,상기 백홀 링크 상의 신호는 짧은(shortened) 서브프레임 포맷을 이용하여 상기 기지국으로 전송되는 것을 특징으로 하는, 신호 송수신 제어 방법.
- RF(Radio Frequency) 유닛;메모리; 및프로세서를 포함하고,상기 프로세서는 셀-특정(cell-specific) 제1 SRS(Sounding Reference Signal) 전송 서브프레임 세트를 확인하고, 릴레이-특정 제2 SRS 전송 서브프레임 세트를 확인하도록 구성되고,백홀 서브프레임이 상기 제1 SRS 전송 서브프레임 세트에 속하지만 상기 제2 SRS 전송 서브프레임 세트에는 속하지 않는 경우, 상기 백홀 서브프레임을 통해 단말로부터 신호가 수신되고,백홀 서브프레임이 상기 제2 SRS 전송 서브프레임 세트에 속하는 경우, 상기 백홀 서브프레임을 통해 기지국으로 SRS 신호가 전송되는, 무선 통신 시스템에 사용되는 릴레이.
- 제15항에 있어서,상기 단말로부터 수신하는 신호는 ACK/NACK (acknowledgement/negative ACK) 또는 SRS를 포함하는 것을 특징으로 하는, 릴레이.
- 제15항에 있어서,상기 상향링크 신호는 상기 백홀 서브프레임의 뒤쪽 시구간을 통해 상기 릴레이에게 전송되는 것을 특징으로 하는, 릴레이.
- 제17항에 있어서,상기 상향링크 신호는 상기 백홀 서브프레임의 SRS 구간을 포함하는 것을 특징으로 하는, 릴레이.
- 제15항에 있어서,상기 백홀 서브프레임이 상기 제1 SRS 전송 서브프레임 세트에 속하지만 상기 제2 SRS 전송 서브프레임 세트에는 속하지 않는 경우,상기 백홀 서브프레임 내에서 백홀 링크로부터 억세스 링크로 스위칭 하는 것을 포함하는 것을 특징으로 하는, 릴레이.
- 제19항에 있어서,상기 백홀 링크 상의 신호는 짧은(shortened) 서브프레임 포맷을 이용하여 상기 기지국으로 전송되는 것을 특징으로 하는, 릴레이.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/395,426 US8687484B2 (en) | 2009-09-09 | 2010-09-09 | Method and apparatus for performing communication in relay system |
| KR1020117027572A KR101785659B1 (ko) | 2009-09-09 | 2010-09-09 | 릴레이 시스템에서 통신을 수행하는 방법 및 장치 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US24066909P | 2009-09-09 | 2009-09-09 | |
| US61/240,669 | 2009-09-09 |
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| Publication Number | Publication Date |
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| WO2011031080A2 true WO2011031080A2 (ko) | 2011-03-17 |
| WO2011031080A3 WO2011031080A3 (ko) | 2011-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/KR2010/006150 Ceased WO2011031080A2 (ko) | 2009-09-09 | 2010-09-09 | 릴레이 시스템에서 통신을 수행하는 방법 및 장치 |
Country Status (3)
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| US (1) | US8687484B2 (ko) |
| KR (1) | KR101785659B1 (ko) |
| WO (1) | WO2011031080A2 (ko) |
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| KR101459147B1 (ko) * | 2008-02-04 | 2014-11-10 | 엘지전자 주식회사 | 무선통신 시스템에서 전송 파워 제어 명령 전송 방법 |
| US10651962B2 (en) * | 2009-11-02 | 2020-05-12 | Hmd Global Oy | Scheme for multi-cell UL sounding transmission |
| US10044489B2 (en) * | 2010-10-22 | 2018-08-07 | Nokia Solutions And Networks Oy | Enhanced inter-network access node scheduling coordination and signaling support for advanced receiver algorithms |
| US9402264B2 (en) * | 2011-09-30 | 2016-07-26 | Intel Corporation | Methods to transport internet traffic over multiple wireless networks simultaneously |
| US10039121B2 (en) * | 2012-06-22 | 2018-07-31 | Lg Electronics Inc. | Scheduling method for device-to-device communication and apparatus for same |
| US9019858B2 (en) | 2013-02-22 | 2015-04-28 | Nokia Solutions And Networks Oy | Generating short term base station utilization estimates for wireless networks |
| WO2016064061A1 (ko) * | 2014-10-24 | 2016-04-28 | 엘지전자 주식회사 | 무선 통신 시스템에서 셀들 간의 간섭을 조정하는 방법 및 이를 위한 장치 |
| US9686675B2 (en) * | 2015-03-30 | 2017-06-20 | Netscout Systems Texas, Llc | Systems, methods and devices for deriving subscriber and device identifiers in a communication network |
| PT3324693T (pt) | 2015-08-12 | 2021-01-06 | Huawei Tech Co Ltd | Método de transmissão de dados, aparelho e meio de armazenamento legível por computador |
| EP3836472B1 (en) | 2015-09-23 | 2023-12-06 | Huawei Technologies Co., Ltd. | Terminal device, network device, uplink sending method, and uplink receiving method |
| US10616912B2 (en) * | 2016-04-22 | 2020-04-07 | Qualcomm Incorporated | Uplink payload determination and uplink grant indication for multefire |
| US10278167B2 (en) | 2016-08-12 | 2019-04-30 | Qualcomm Incorporated | Downlink control channel structure for low latency applications |
| US10425205B2 (en) | 2016-12-22 | 2019-09-24 | Qualcomm Incorporated | Sounding reference signal transmission in low latency wireless transmissions |
| CN110691416B (zh) * | 2018-07-05 | 2023-06-09 | 华为技术有限公司 | 一种资源调度的方法和装置 |
| WO2020050696A1 (ko) * | 2018-09-07 | 2020-03-12 | 엘지전자 주식회사 | 무선 통신 시스템에서 릴레이 단말의 신호 송수신 방법 및 그 장치 |
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| KR101043833B1 (ko) | 2006-08-18 | 2011-06-22 | 후지쯔 가부시끼가이샤 | 신규 및 레거시 무선 통신 디바이스가 공존하는 앰블 시퀀스 |
| US8676223B2 (en) * | 2007-03-23 | 2014-03-18 | Qualcomm Incorporated | Backhaul communication for interference management |
| US8514768B2 (en) * | 2008-12-11 | 2013-08-20 | Lg Electronics Inc. | Method and apparatus for transmitting reference signal performed by relay station in wireless communication system |
| US8400906B2 (en) * | 2009-03-11 | 2013-03-19 | Samsung Electronics Co., Ltd | Method and apparatus for allocating backhaul transmission resource in wireless communication system based on relay |
| WO2010137926A2 (ko) * | 2009-05-29 | 2010-12-02 | 엘지전자 주식회사 | 중계기 백홀 상향링크에서 제어 정보의 전송 방법 및 장치 |
| US8576755B2 (en) * | 2010-01-11 | 2013-11-05 | Qualcomm Incorporated | Apparatus and method for relay transition time |
| US8594010B2 (en) * | 2010-01-11 | 2013-11-26 | Qualcomm Incorporated | Apparatus and method for physical control format indicator channel (PCFICH) information sharing over relay backhaul link |
-
2010
- 2010-09-09 US US13/395,426 patent/US8687484B2/en not_active Expired - Fee Related
- 2010-09-09 KR KR1020117027572A patent/KR101785659B1/ko not_active Expired - Fee Related
- 2010-09-09 WO PCT/KR2010/006150 patent/WO2011031080A2/ko not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2011031080A3 (ko) | 2011-07-14 |
| KR101785659B1 (ko) | 2017-10-17 |
| US20120170510A1 (en) | 2012-07-05 |
| KR20120049845A (ko) | 2012-05-17 |
| US8687484B2 (en) | 2014-04-01 |
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