WO2012023835A2 - 전송 포맷의 변경에 관련된 신호를 송신하는 방법 - Google Patents
전송 포맷의 변경에 관련된 신호를 송신하는 방법 Download PDFInfo
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- WO2012023835A2 WO2012023835A2 PCT/KR2011/006145 KR2011006145W WO2012023835A2 WO 2012023835 A2 WO2012023835 A2 WO 2012023835A2 KR 2011006145 W KR2011006145 W KR 2011006145W WO 2012023835 A2 WO2012023835 A2 WO 2012023835A2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
- H04L1/0038—Blind format detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/189—Transmission or retransmission of more than one copy of a message
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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
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
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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
- ITU-R International Telecommunication Union Radio communication sector
- IP Internet Protocol
- the 3rd Generation Partnership Project (3GPP) is a system standard that meets the requirements of International Mobile Telecommunication (IMT) -Advanced.It is based on Orthogonal Frequency Division Multiple Access (OFDMA) / Single Carrier-Frequency Division Multiple Access (SC-FDMA) transmission.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier-Frequency Division Multiple Access
- LTE-Advanced is one of the potential candidates for IMT-Advanced.
- the main technologies of LTE-Advanced include relay station technology.
- a relay station is a device for relaying a signal between a base station and a terminal, and is used to expand cell coverage and improve throughput of a wireless communication system.
- a transmission format such as a transmission mode of a downlink channel is used. If the information about the transmission format is not correctly transmitted to the relay station, the base station, the terminal, etc., a problem may occur in which a communication connection cannot be maintained. Therefore, there is a need for a communication technique for accurately transmitting a transmission format in consideration of operating characteristics of a relay station, a base station, and a terminal.
- the following description provides a method for transmitting a signal related to a change in transmission format.
- a method for transmitting a signal related to a change in a transmission format includes transmitting, from a base station to a receiver, a RRC message indicating that the first transmission format is changed to a second transmission format in a wireless communication system using an OFDM symbol or an SC-FDMA symbol; And if the ACK message for the RRC message is not received, transmitting the RRC message repeatedly from the base station to the receiver with data based on the first transmission format or data based on a second transmission format.
- data based on the first transmission format and data based on the second transmission format transmitted together with the RRC message are alternately selected.
- the receiver is a relay node, and the transmission format includes bitmap information related to the backhaul subframe allocation, and any one of a plurality of backhaul subframes indicated by the first transmission format is It overlaps any one of the plurality of backhaul subframes indicated by the second transport format.
- the receiver is a relay node, and the transmission format includes bitmap information associated with a frequency resource indicating an R-PDCCH search space and includes a plurality of frequencies indicated by the first transmission format. Any one of the resources overlaps any one of the plurality of frequency resources indicated by the second transmission format.
- the step of repeatedly transmitting the RRC message is performed when an ACK message for the RRC message is not received before the first timer of the base station expires.
- the step of repeatedly transmitting the RRC message is performed until the second timer of the base station expires.
- Data based on the first transmission format and data based on the second transmission format are alternately selected according to a predetermined pattern.
- the transmission format may include any one of a transmission mode, a backhaul subframe allocation, an R-PDCCH search space, an R-PDCCH demodulation reference single (DMRS) setting, and a backhaul timing setting of a downlink channel. It is related to one.
- the receiver is a relay node or a terminal.
- the RRC message is an RRC Connection Reconfiguration message.
- a base station using an OFDM symbol or an SC-FDMA symbol transmits to the receiver an RRC message indicating that the first transmission format is changed to the second transmission format, and when the ACK message for the RRC message is not received, from the base station to the receiver, the first transmission.
- a radio frequency (RF) unit configured to repeatedly transmit the RRC message with data based on a format or data based on a second transmission format, and data based on the first transmission format transmitted with the RRC message; 2 Data based on the transmission format is selected alternately.
- information about the changed transmission format may be used at the transmitting side and the receiving side. This can improve performance.
- 1 shows a wireless communication system including a relay station.
- FIG. 2 shows a radio frame structure of 3GPP LTE.
- 3 is an exemplary diagram illustrating a resource grid for one downlink slot.
- FIG. 4 shows a structure of a downlink subframe between a base station and a terminal.
- FIG. 5 shows a structure of an uplink subframe between a base station and a terminal.
- FIG. 6 shows a method of transmitting a backhaul downlink signal according to an embodiment of the present invention.
- FIG. 9 shows an example of a method of reestablishing an RRC connection to change a transport format.
- FIG 11 shows an example in which information common to different transmission formats is included.
- FIG. 12 shows an example of a method for resetting an RRC connection.
- 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
- 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 802.16e (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 an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
- LTE-Advanced (LTE-A) is the evolution of 3GPP LTE.
- 3GPP LTE / LET-A will be described as an example, but the technical spirit of the present invention is not limited thereto.
- 1 shows a wireless communication system including a relay station.
- a wireless communication system 10 including a relay station includes at least one base station 11 (eNodeB, eNB).
- Each base station 11 provides a communication service for a particular geographic area 15, commonly referred to as a cell.
- the cell can be further divided into a plurality of areas, each of which is called a sector.
- One or more cells may exist in one base station.
- the base station 11 generally refers to a fixed station communicating with the terminal 13, and includes a base station (BS), a base transceiver system (BTS), an access point, an access network (AN), and the like. It may be called in other terms.
- the base station 11 may perform functions such as connectivity, management, control, and resource allocation between the relay station 12 and the terminal 14.
- Relay Node refers to a device for relaying a signal between the base station 11 and the terminal 14, and may be referred to as other terms such as a relay station, a repeater, a relay, and the like. Can be.
- a relay method used by the relay station any method such as AF and ADF may be used, and the technical spirit of the present invention is not limited thereto.
- Terminals 13 and 14 may be fixed or mobile, and may include a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, and a personal digital assistant (PDA). ), A wireless modem, a handheld device, and an access terminal (AT).
- the macro terminal (macro-UE, Ma-UE, 13) is a terminal that communicates directly with the base station 11
- the relay node (relay node-UE, RN-UE, 14) refers to a terminal that communicates with the relay station. Even in the macro terminal 13 in the cell of the base station 11, it is possible to communicate with the base station 11 via the relay station 12 to improve the transmission rate according to the diversity effect.
- the link between the base station 11 and the macro terminal 13 may be called a macro link.
- the macro link may be divided into a macro downlink and a macro uplink.
- a macro downlink (M-DL) means communication from the base station 11 to the macro terminal 13
- a macro uplink , M-UL means communication from the macro terminal 13 to the base station 11.
- the link between the base station 11 and the relay station 12 may be called a backhaul link.
- the backhaul link may be divided into a backhaul downlink (B-DL) and a backhaul uplink (B-UL).
- B-DL backhaul downlink
- B-UL backhaul uplink
- the backhaul downlink means communication from the base station 11 to the relay station 12
- the backhaul uplink means communication from the relay station 12 to the base station 11.
- the link between relay station 12 and relay station terminal 14 may be called an access link.
- the access link may be divided into an access downlink (A-DL) and an access uplink (A-UL).
- Access downlink means communication from the relay station 12 to the relay station terminal 14, and access uplink means communication from the relay station terminal 14 to the relay station 12.
- the wireless communication system 10 including the relay station is a system supporting bidirectional communication.
- Bidirectional communication may be performed using a time division duplex (TDD) mode, a frequency division duplex (FDD) mode, or the like.
- TDD mode uses different time resources in uplink transmission and downlink transmission.
- FDD mode uses different frequency resources in uplink transmission and downlink transmission.
- FIG. 2 shows a radio frame structure of 3GPP LTE.
- a radio frame consists of 10 subframes, and one subframe consists of two slots.
- One subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
- the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
- TTI may be a minimum unit of scheduling.
- the structure of the radio frame described with reference to FIG. 2 is 3GPP TS 36.211 V8.3.0 (2008-05) "Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 8)" See sections 4.1 and 4.
- 3 is an exemplary diagram illustrating a resource grid for one downlink slot.
- One slot in the FDD and TDD radio frames includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain.
- OFDM orthogonal frequency division multiplexing
- RBs resource blocks
- the symbol may mean one OFDM symbol or one SC-FDMA symbol.
- the resource block includes a plurality of consecutive subcarriers in one slot in resource allocation units.
- a slot (eg, a downlink slot included in a downlink subframe) includes a plurality of OFDM symbols in a time domain.
- one downlink slot includes 7 OFDM symbols and one resource block includes 12 subcarriers in the frequency domain, but is not limited thereto.
- the subcarriers in the RB may have an interval of, for example, 15 KHz.
- Each element on the resource grid is called a resource element (RE), and one resource block (RB) includes 12 ⁇ 7 resource elements.
- the number NDL of resource blocks included in a downlink slot depends on a downlink transmission bandwidth set in a cell.
- the resource grid described in FIG. 3 may also be applied to uplink.
- FIG. 4 shows a structure of a downlink subframe between a base station and a terminal.
- a subframe includes two consecutive slots.
- the first 3 OFDM symbols of the first slot in the subframe are the control region to which the PDCCH is allocated, and the remaining OFDM symbols are the data region to which the PDSCH is allocated.
- the control region may be allocated a control channel such as PCFICH and PHICH.
- the UE may read the data information transmitted through the PDSCH by decoding the control information transmitted through the PDCCH.
- the number of OFDM symbols to which the PDCCH is allocated is variable.
- additional control information may be included in the data area to which the PDSCH is allocated.
- the control region is composed of logical CCE columns that are a plurality of CCEs.
- the CCE column is a collection of all CCEs constituting the control region in one subframe.
- the CCE corresponds to a plurality of resource element groups (REGs).
- the CCE may correspond to 9 resource element groups.
- Resource element group (REG) is used to define the mapping of control channels to resource elements.
- one resource element group may consist of four resource elements.
- DCI downlink control information
- DCI includes uplink scheduling information (uplink grant), downlink scheduling information (downlink grant), system information, system information, uplink power control command, control information for paging, random access response ( Control information for indicating a RACH response).
- FIG. 5 shows a structure of an uplink subframe between a base station and a terminal.
- the uplink subframe is allocated a control region in which a physical uplink control channel (PUCCH) carrying uplink control information is allocated in a frequency domain and a physical uplink shared channel (PUSCH) carrying user data. It can be divided into data areas.
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- the PUCCH for one UE is allocated to a resource block (RB) pair (51, 52) in a subframe, and the RBs 51 and 52 belonging to the RB pair occupy different subcarriers in each of two slots. do. This is said that the RB pair allocated to the PUCCH is frequency hopping at the slot boundary.
- RB resource block
- PUCCH may support multiple formats. That is, uplink control information having different numbers of bits per subframe may be transmitted according to a modulation scheme. For example, when using Binary Phase Shift Keying (BPSK) (PUCCH format 1a), uplink control information of 1 bit can be transmitted on PUCCH, and when using Quadrature Phase Shift Keying (QPSK) (PUCCH format 1b). 2 bits of uplink control information can be transmitted on the PUCCH.
- BPSK Binary Phase Shift Keying
- QPSK Quadrature Phase Shift Keying
- Format 1 In addition to the PUCCH format, there are Format 1, Format 2, Format 2a, Format 2b, and the like (3GPP TS 36.211 V8.2.0 (2008-03) "Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); See Section 5.4 of “Physical Channels and Modulation (Release 8)”.
- FIG. 6 shows an example of a method for transmitting a backhaul downlink signal.
- the base station transmits control information to the relay station (S100).
- the control information may include information about a resource for transmitting the backhaul downlink data.
- the control information may be transmitted in an upper layer signal such as radio resource control (RRC) signaling or may be transmitted in a physical layer signal.
- RRC radio resource control
- the control information may include resource allocation information about an additional control signal transmitted later.
- the relay station decodes the control information (S200).
- the relay station may decode the control information to know information related to radio resources through which backhaul downlink data is transmitted.
- the base station transmits the backhaul downlink data (S300).
- the backhaul downlink data may be transmitted through a radio resource indicated by the control information.
- the control information may include information about a transmission format.
- Information about the transport format may be transmitted through RRC signaling.
- the information on the transmission format includes information on a transmission mode, information on a backhaul subframe allocation, information on an R-PDCCH search space, and setting an R-PDCCH demodulation reference signal (DMRS). It may include at least one of information on and information on the backhaul timing setting.
- Transmission is used to determine the format of the above-described DCI.
- C-RNTI cell radio network temporary identifier
- seven modes from transmission mode 1 to transmission mode 7 are supported.
- Each transmission mode supports two DCI formats. That is, when the C-RNTI and the information about the transmission mode are obtained, two DCI formats can be known.
- One of the two DCI formats for a particular transmission mode may be used in fallback mode.
- DCI format 1A which is common to seven modes, may be used as a fallback mode.
- the backhaul link represents the link between the base station and the relay station. Since not all subframes are used for backhaul, information indicating which subframe is used for backhaul is included in the information about backhaul subframe allocation.
- the information on the backhaul subframe allocation may be delivered through RRC signaling in the form of a bitmap.
- the PDCCH transmitted by the base station may be divided into an eNB-PDCCH (or Macro-PDCCH) and an R-PDCCH (or RN-PDCCH).
- the eNB-PDCCH is a PDCCH transmitted from a base station to a terminal and represents a general PDCCH
- the R-PDCCH represents a PDCCH transmitted from a base station to a relay station.
- the PDCCH is transmitted through the number of OFDM symbols indicated by the PCFICH, and the PDSCH is transmitted in the remaining areas.
- the R-PDCCH may be included in the conventional PDSCH region.
- the R-PDCCH means a control channel through which the base station transmits backhaul downlink control information to the relay station.
- the R-PDCCH may be called a relay node-PDCCH (RN-PDCCH).
- the structure or operation related to the R-PDCCH may be different from the eNB-PDCCH described above.
- the R-PDSCH refers to a data channel through which a base station transmits backhaul downlink data to a relay station.
- the R-PDCCH search space means a radio resource region to which the R-PDCCH is transmitted.
- a blind decoding scheme is used.
- an R-PDCCH search space is designated through RRC signaling. Therefore, it is important to normally receive the RRC message for decoding the R-PDCCH.
- the information on the R-PDCCH demodulation reference signal (DMRS) configuration is information indicating whether to use existing cell-specific reference signals (CRS) or DMRS for decoding the R-PDCCH.
- CRS cell-specific reference signals
- the information on the backhaul timing setting is information necessary for decoding the R-PDCCH and the R-PDSCH, and may include information on a location where the R-PDSCH starts.
- FIG. 7 and 8 illustrate an example of RRC signaling.
- the base station eNB transmits an RRC Connection Reconfiguration message to the relay station RN, and when the reset is successful, the relay station RN completes an RRC connection reconfiguration completion. Complete) message is transmitted to the base station (eNB). That is, FIG. 7 relates to the case where the reset succeeds, and FIG. 8 relates to the case where the reset fails.
- the eNB and the RS initiate an RRC connection re-establishment procedure.
- Signaling for RRC connection reconfiguration shown in FIGS. 7 and 8 may be used when changing the above-described transport format. That is, as described above, information on a transmission mode related to DCI format, information on backhaul subframe allocation, information on R-PDCCH search space, and R-PDCCH DMRS (demodulation) reference information), and when the information on the backhaul timing setting is changed, an RRC connection reconfiguration signal may be used.
- 9 shows an example of a method of reestablishing an RRC connection to change a transport format. 9 may be applied to communication between a base station and a relay station (RN). 9 may also be applied to communication between a base station and a UE. For convenience of explanation, communication between the base station and the relay station will be described below.
- RN relay station
- the base station transmits an RRC message notifying the relay station that the first transmission format is changed to the second transmission format (S910).
- An example of an RRC message may be the RRC Connection Reconfiguration message.
- the relay station receiving the RRC message transmits an ACK message to the base station. If the ACK message is not received by the base station, the RRC message is transmitted together with the data based on the second transmission format (S920). After performing step S920, when the ACK message is not received by the base station, the RRC message is transmitted together with the data based on the first transmission format (S930). As shown, the steps of S920 and S930 may be performed repeatedly. In addition, step S920 and step S930 may be performed alternately. If the ACK message for the RRC message of step S910 is transmitted to the base station, the base station and the relay station changes the transmission format to perform communication.
- the base station transmits an RRCConnectionReconfiguration message to the relay station.
- the RRCConnectionReconfiguration message may indicate that the first transport format is changed to the second transport format.
- a specific bit of the RRCConnectionReconfiguration message may indicate that the transmission format has been changed.
- the bit indicating the second transmission format may indicate that the second transmission format will be used.
- the first transmission format is indicated as 'format M'
- the second transmission format is indicated as 'format N'.
- the transport format includes information on a transmission mode related to the DCI format, information on a backhaul subframe allocation, information on an R-PDCCH search space, and R- Information on a PDCCH demodulation reference signal (DMRS) configuration and information on a backhaul timing configuration may be indicated.
- DMRS PDCCH demodulation reference signal
- the RRCConnectionReconfiguration message operates as 'Message 1'. Accordingly, the relay station that successfully receives the message 1 transmits the message 2 to the base station. That is, the relay station transmits an ACK message to the base station (S950). When the relay station sends 'Message 2', the relay station uses the first transmission format. On the other hand, the base station uses the second transmission format when receiving the 'Message 2'.
- the base station when the base station does not receive 'Message 2', the base station retransmits 'Message 1'.
- data based on the second transmission format is also transmitted.
- the transmission format is information about a transmission mode related to the DCI format
- 'Message 2' is transmitted with data generated based on the new DCI format.
- the transmission format is information about backhaul subframe allocation
- it is transmitted with data generated based on the new backhaul subframe allocation.
- the new format ie, the second transmission format
- the new format and the old format can be selected repeatedly.
- the second transmission format-> first transmission format-> second transmission format-> transmission like the first transmission format
- the format can be used alternately and repeatedly. Alternately, the manner of selection may vary. For example, as in steps S920 to S940 of FIG. 9, the pattern may be repeated in a second transmission format-> first transmission format-> second transmission format-> first transmission format. Also, a pattern in which the second transmission format is used more than the first transmission format may be used, or a pattern in which the first transmission format is used more than the second transmission format may be used.
- the operation of alternately selecting the first transmission format and the second transmission format according to a specific pattern may be repeated until 'Message 2' is successfully received by the base station.
- An operation of alternately selecting a transmission format according to a pattern may be performed in units of subframes. That is, an operation in which the second transmission format is used in the first subframe and the first transmission format is then used in the second subframe may be performed.
- the base station may use at least one timer. That is, the base station may start the first timer while transmitting the 'Message 1', and if the 'Message 2' is not received before the first timer expires, the base station may perform the above-described step S920 to S940. In addition, when the first timer expires, the base station may start the second timer. In this case, steps S920 to S940 may be performed before the second timer expires.
- the above-described timers 1 and 2 may be implemented separately or may be implemented as one and operated with the same value.
- a retry counter for the first transmission format and the second transmission format may be used. That is, the number of times the first transmission format is used and the number of times the second transmission format is used may be determined as a retry counter.
- the retry counter may increase by one when the first transmission format and the second transmission format are transmitted alternately according to a specific pattern. That is, if the second transmission format-> first transmission format-> second transmission format-> first transmission format pattern is used, retry when the second transmission format-> first transmission format is used The counter can be increased by one.
- the retry counter can be used in increments or decrements. In this case, steps S920 to S940 may be performed until the retry counter reaches a predetermined value.
- the number of repetitions may be determined according to the information included in the transmission format. E.g. When the transmission format includes information on a transmission mode related to the DCI format, since one DCI format includes two DCI formats, the number of repetitions may be set to two.
- a method for solving a problem that occurs when the base station does not successfully receive 'Message 2' transmitted in step S950 is proposed. If the base station does not successfully receive 'Message 2', the relay station uses a new transmission format and the base station uses the previous transmission format, so that the relay station generates a decoding error for the control channel.
- the relay station sends 'Message 2' and has not received an ACK message (ie, 'Message 3') for 'Message 2' from the base station until the timer expires, then the relay station receives 'Message 2' received by the base station. Assume that it is not. The relay station then decodes using the previous transport format instead of the new transport format. In this case, it is preferable that the base station also knows that the relay station performs the above operation. If the ACK message (ie, 'Message 3') for 'Message 2' is not received, the base station uses the previous transmission format since the base station knows that the relay station uses the previous transmission format.
- the base station uses the new transmission format before the third timer set by the base station expires. This is to prevent the case that the base station successfully receives 'Message 2' but the relay station uses the previous transmission format.
- the third timer has a minimum value defined (ie, a time at which the base station should send a signal to the relay station after receiving 'Message 2').
- the first, second, and third timers described above may be implemented separately or implemented as one and operated with the same value.
- a method of using a fallback mode of the transport format is proposed.
- the transmission format is information on a transmission mode related to the DCI format
- a fallback mode is preset for each transmission mode. For example, when one transmission mode includes a DCI format 1A set as the fallback mode and another DCI format, it is possible to use the fallback mode in the example of FIG. 9. That is, in the process of transmitting and receiving the RRCConnectionReconfiguration message, the base station and the relay station can always use the fallback mode.
- the relay station may transmit 'Message 2' while not using the new transmission format. That is, when the relay station transmits 'Message 2', the new transmission format may be used after a predetermined time (for example, a preset time). In other words, if a predetermined time has not elapsed, the relay station transmitting 'Message 2' may use the previous transmission format. If the predetermined time has elapsed, the new transmission format may be used.
- a predetermined time for example, a preset time
- 'Message 3 (not shown)'.
- the relay station receiving 'Message 3' transmits an RRCConnectionReconfigurationComplete message (S960), that is, 'Message 4'.
- S960 RRCConnectionReconfigurationComplete message
- 'Message 3' and 'Message 4' may additionally include information transmitted from the base station to the relay station. That is, when the base station successfully receives 'Message 2', the 'Message 3' may notify the base station when the new format is used with successful reception.
- DL-Grant downlink grant
- 'Message 4' may be implemented as a UL-ACK / NACK for the DL-Grant rather than an upper layer signal.
- decoding is performed based on the previous transmission format in the first subframe using all the blind decoding capabilities available at the relay station, and based on the new transmission format in the second subframe.
- Decoding can be performed. It is also possible to perform blind decoding using both the old transport format and the new transport format in a particular subframe. When both types of transmission formats are used, the number of blind decodings applied to each format is reduced.
- the blind decoding can be performed according to a specific pattern, and the blind decoding can be repeatedly performed.
- the relay station alternately selects a previous transmission format and a new transmission format
- the base station will not alternately transmit the previous transmission format (ie, the first transmission format) and the new transmission format (ie, the second transmission format). It may be. That is, since the relay station alternately selects a transmission format for decoding, the above-described effect can be achieved even if the base station does not alternately select the transmission format.
- each transport format preferably includes a common format, common information, or a common area.
- the transport format includes bitmap information related to backhaul subframe allocation
- any one of the plurality of backhaul subframes indicated by the first transport format is indicated by the second transport format. It is desirable to overlap (ie, common) with any one of the plurality of backhaul subframes.
- the transport format may include bitmap information related to backhaul subframe allocation. That is, as illustrated in FIG. 10, a bitmap for representing subframes allocated as a backhaul subframe among subframes having indices of 0 to 9 may be used.
- 'Format 1' of FIG. 10 may be represented by '1001001010' or a decimal equivalent thereof
- 'Format 2' of FIG. 10 may be represented by '0100100101' or a decimal equivalent thereof.
- the second transport format do not have a common area. If there is no common area as shown in FIG. 10, when the base station uses 'Format 1' and the relay station uses 'Format 2', the link between the base station and the relay station may be broken.
- the transport format includes bitmap information related to backhaul subframe allocation
- the transmission format includes bitmap information related to frequency resources indicating an R-PDCCH search space. That is, the R-PDCCH search space is represented by the index of RB (Resource Blcok) that the relay station searches to decode the R-PDCCH.
- the index may be displayed in a bitmap format.
- any one of a plurality of frequency resources (ie, RB index) indicated by the first transmission format overlaps any one of a plurality of frequency resources (ie, RB index) indicated by the second transmission format. It is preferable. That is, it is preferable that the area indicated by the first transmission format and the area indicated by the second transmission format be common in the frequency domain. If a common area exists on the frequency, the link can be maintained even if the base station and the relay station use different transmission formats.
- both the base station and the relay station may use one of the plurality of transmission formats. That is, if a transmission format to be used when a link problem occurs in the link between the base station and the relay station is predetermined, the same transmission format may be used by the base station and the relay station without separate signaling when the link problem occurs.
- aggregation levels when information common to different transport formats is included, when blind decoding the information, all aggregation levels (1, 2, 4, 8) are not used, and a high number of aggregation levels (for example, 4). , 8) can be configured to use only the transport format. That is, when information common to different transmission formats is included, it is proposed to limit that the PDCCH may exist only in a part of the entire search space when blind decoding the corresponding PDCCH. For example, when the transport format indicates an R-PDCCH search space, a control channel element (CCE) aggregation level may be limited in consideration of the fixed characteristics of the relay station. That is, regions overlapping among the R-PDCCH search spaces may be configured to exist only in a search space having a high number of aggregation levels (for example, 4 and 8).
- CCE control channel element
- the above-described method may be applied to a link between the terminal and the base station instead of the relay station.
- the PDCCH transmitted from the base station to the terminal may be transmitted through the data region instead of the control region (the first three OFDM symbols in the subframe) of the subframe.
- Such a PDCCH may be called in various terms such as an extended PDCCH (E-PDCCH), and a search space may be notified of the PDCCH through RRC signaling.
- E-PDCCH extended PDCCH
- the above-described method is not limited thereto. Specifically, even when the transport format is changed through signaling other than RRC signaling, as described above, the first transport format and the second transport format may be alternately selected and sent. In addition, even when RRC signaling is not used, it may be determined that the first transport format and the second transport format have areas in common with each other.
- the transmitter 800 of FIG. 13 includes a processor 810, a memory 830, and an RF unit 820.
- the transmitter 800 may be a base station, a relay station or a terminal.
- the processor 810 may allocate radio resources according to information provided from the outside, information previously stored therein, and the like. The procedures, techniques, and functions performed by the transmitter among the above-described embodiments may be implemented by the processor 810.
- the memory 830 is connected to the processor 810 and stores various information for driving the processor 810.
- the RF unit 820 is connected to the processor 810 to transmit and / or receive a radio signal.
- the receiver 900 communicating with the transmitter includes a processor 910, a memory 920, and an RF unit 930.
- the receiver 900 may be a base station, a relay station or a terminal.
- the procedures, techniques, and functions performed by the receiver among the above-described embodiments may be implemented by the processor 910.
- the memory 920 is connected to the processor 910 and stores various information for driving the processor 910.
- the RF unit 930 is connected to the processor 910 to transmit and / or receive a radio signal.
- Processors 810 and 910 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
- the memory 820, 920 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device.
- the RF unit 830 and 930 may include a baseband circuit for processing a radio signal.
- the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
- the module may be stored in the memory 820, 920 and executed by the processor 810, 910.
- the memories 820 and 920 may be inside or outside the processors 810 and 910, and may be connected to the processors 810 and 910 through various well-known means.
- the method and apparatus described above may be implemented in hardware, software or a combination thereof.
- an application specific integrated circuit ASIC
- DSP digital signal processing
- PLD programmable logic device
- FPGA field programmable gate array
- the module may be implemented as a module that performs the above-described function.
- the software may be stored in a memory unit and executed by a processor.
- the memory unit or processor may employ various means well known to those skilled in the art.
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Abstract
Description
Claims (12)
- OFDM 심볼 또는 SC-FDMA 심볼을 사용하는 무선 통신 시스템에서기지국으로부터 수신기로, 제1 전송 포맷이 제2 전송 포맷으로 변경됨을 지시하는 RRC 메시지를 송신하는 단계; 및상기 RRC 메시지에 대한 ACK 메시지가 수신되지 않는 경우, 상기 기지국으로부터 상기 수신기로, 상기 제1 전송 포맷에 기초한 데이터 또는 제2 전송 포맷에 기초한 데이터와 함께 상기 RRC 메시지를 반복적으로 송신하는 단계를 포함하되,상기 RRC 메시지와 함께 송신되는 상기 제1 전송 포맷에 기초한 데이터 및 제2 전송 포맷에 기초한 데이터는 교대로 선택되는전송 포맷의 변경에 관련된 신호를 송신하는 방법.
- 제1항에 있어서상기 수신기는 중계국(relay node)이고,상기 전송 포맷은 상기 백홀(backhaul) 서브프레임 할당에 관련된 비트맵 정보를 포함하고,상기 제1 전송 포맷에 의해 지시되는 복수의 백홀 서브프레임 중 어느 하나는 상기 제2 전송 포맷에 의해 지시되는 복수의 백홀 서브프레임 중 어느 하나와 중첩되는전송 포맷의 변경에 관련된 신호를 송신하는 방법.
- 제1항에 있어서상기 수신기는 중계국(relay node)이고,상기 전송 포맷은, R-PDCCH 검색 공간(search space)을 지시하는 주파수 자원과 관련된 비트맵 정보를 포함하고,상기 제1 전송 포맷에 의해 지시되는 복수의 주파수 자원 중 어느 하나는 상기 제2 전송 포맷에 의해 지시되는 복수의 주파수 자원 중 어느 하나와 중첩되는전송 포맷의 변경에 관련된 신호를 송신하는 방법.
- 제1항에 있어서,상기 RRC 메시지를 반복적으로 송신하는 단계는, 상기 기지국의 제1 타이머가 만료(expire)하기 이전에 상기 RRC 메시지에 대한 ACK 메시지가 수신되지 않은 경우에 수행되는전송 포맷의 변경에 관련된 신호를 송신하는 방법.
- 제4항에 있어서,상기 RRC 메시지를 반복적으로 송신하는 단계는, 상기 기지국의 제2 타이머가 만료할 때까지 수행되는전송 포맷의 변경에 관련된 신호를 송신하는 방법.
- 제1항에 있어서,상기 제2 전송 포맷에 기초한 데이터가 먼저 송신된 이후, 상기 제1 전송 포맷에 기초한 데이터가 송신되는전송 포맷의 변경에 관련된 신호를 송신하는 방법.
- 제1항에 있어서,상기 제1 전송 포맷에 기초한 데이터 및 제2 전송 포맷에 기초한 데이터는, 기설정된 패턴에 따라 교대로 선택되는전송 포맷의 변경에 관련된 신호를 송신하는 방법.
- 제1항에 있어서,상기 전송 포맷은, 하항 채널의 전송 모드(transmission mode), 백홀(backhaul) 서브프레임 할당, R-PDCCH 검색 공간(search space), R-PDCCH DMRS(demodulation reference single) 설정, 및 백홀 타이밍 설정 중 어느 하나와 관련되는전송 포맷의 변경에 관련된 신호를 송신하는 방법.
- 제1항에 있어서,상기 수신기는 중계국(relay node) 또는 단말인전송 포맷의 변경에 관련된 신호를 송신하는 방법.
- 제1항에 있어서,상기 RRC 메시지에 대한 ACK 메시지를 수신하는 경우, 상기 ACK 메시지에 대한 응답 메시지를 송신하는 단계를 더 포함하는전송 포맷의 변경에 관련된 신호를 송신하는 방법.
- 제1항에 있어서,상기 RRC 메시지는 RRC 연결 재설정(RRC Connection Reconfiguration) 메시지인전송 포맷의 변경에 관련된 신호를 송신하는 방법.
- OFDM 심볼 또는 SC-FDMA 심볼을 사용하는 기지국에 있어서,수신기로, 제1 전송 포맷이 제2 전송 포맷으로 변경됨을 지시하는 RRC 메시지를 송신하고,상기 RRC 메시지에 대한 ACK 메시지가 수신되지 않는 경우, 상기 기지국으로부터 상기 수신기로, 상기 제1 전송 포맷에 기초한 데이터 또는 제2 전송 포맷에 기초한 데이터와 함께 상기 RRC 메시지를 반복적으로 송신하도록 설정된 무선주파수(RF) 유닛을 포함하고,상기 RRC 메시지와 함께 송신되는 상기 제1 전송 포맷에 기초한 데이터 및 제2 전송 포맷에 기초한 데이터는 교대로 선택되는기지국.
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KR1020137004037A KR101857305B1 (ko) | 2010-08-20 | 2011-08-19 | 전송 포맷의 변경에 관련된 신호를 송신하는 방법 |
US13/817,788 US9137845B2 (en) | 2010-08-20 | 2011-08-19 | Method for transmitting a signal related to a change in transmission format |
EP11818435.7A EP2608433B1 (en) | 2010-08-20 | 2011-08-19 | Method and apparatus for transmitting a signal related to a change in transmission format |
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US37529810P | 2010-08-20 | 2010-08-20 | |
US61/375,298 | 2010-08-20 |
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- 2011-08-19 US US13/817,788 patent/US9137845B2/en not_active Expired - Fee Related
- 2011-08-19 EP EP11818435.7A patent/EP2608433B1/en not_active Expired - Fee Related
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EP2976841A1 (en) * | 2013-01-18 | 2016-01-27 | Texas Instruments Incorporated | Methods for energy-efficient unicast and multicast transmission in a wireless communication system |
EP2976841A4 (en) * | 2013-01-18 | 2017-05-10 | Texas Instruments Incorporated | Methods for energy-efficient unicast and multicast transmission in a wireless communication system |
CN112838919A (zh) * | 2013-01-18 | 2021-05-25 | 德克萨斯仪器股份有限公司 | 无线通信系统中用于高能效单播传输和多播传输的方法 |
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Also Published As
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WO2012023835A3 (ko) | 2012-04-12 |
EP2608433A2 (en) | 2013-06-26 |
US9137845B2 (en) | 2015-09-15 |
EP2608433B1 (en) | 2019-03-27 |
KR20130106352A (ko) | 2013-09-27 |
US20130142111A1 (en) | 2013-06-06 |
KR101857305B1 (ko) | 2018-06-19 |
EP2608433A4 (en) | 2017-06-21 |
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