WO2013009109A2 - Appareil et procédé de transmission d'un canal de commande dans un système de communication sans fil - Google Patents

Appareil et procédé de transmission d'un canal de commande dans un système de communication sans fil Download PDF

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Publication number
WO2013009109A2
WO2013009109A2 PCT/KR2012/005542 KR2012005542W WO2013009109A2 WO 2013009109 A2 WO2013009109 A2 WO 2013009109A2 KR 2012005542 W KR2012005542 W KR 2012005542W WO 2013009109 A2 WO2013009109 A2 WO 2013009109A2
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pdcch
resource block
downlink control
dci
control information
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PCT/KR2012/005542
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English (en)
Korean (ko)
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WO2013009109A3 (fr
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윤성준
박동현
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주식회사 팬택
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Publication of WO2013009109A2 publication Critical patent/WO2013009109A2/fr
Publication of WO2013009109A3 publication Critical patent/WO2013009109A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • 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 signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management

Definitions

  • the present invention relates to wireless communication, and more particularly, to an apparatus and method for transmitting a control channel in a wireless communication system.
  • one base station provides a service to a plurality of terminals.
  • the base station schedules data for a plurality of terminals and transmits control information about the data together with the data.
  • a channel carrying control information is called a control channel
  • a channel carrying data is called a data channel.
  • the terminal acquires its own control information by monitoring the control channel, and processes its data using the control information. Monitoring means that the terminal decodes the control channel candidates.
  • control channels of a plurality of terminals are generally multiplexed within one transmission interval. That is, the base station transmits a plurality of control channels for the plurality of terminals to provide services to the plurality of terminals.
  • the terminal finds its own control channel among the plurality of control channels. If the terminal does not correctly detect its control channel from the multiplexed control channels, it is not possible to decode the data channel.
  • the capacity of the control channel increases.
  • radio resources for the control channel are limited, there is a need for an apparatus and method for transmitting a control channel that can efficiently support the increasing capacity of the control channel.
  • An object of the present invention is to provide an apparatus and method for transmitting a control channel in a wireless communication system.
  • Another object of the present invention is to provide an apparatus and method for distributing and transmitting a plurality of control channels to a control region and a data region, respectively.
  • Another technical problem of the present invention is to provide an apparatus and method for notifying a terminal whether to transmit an extended physical downlink control channel using an extended channel indicator.
  • Another technical problem of the present invention is to provide an apparatus and method for using basic downlink control information as header information for extended downlink control information.
  • a method for transmitting a control channel in a wireless communication system includes generating basic downlink control information including an extended channel indicator indicating whether to transmit an extended-physical downlink control channel (E-PDCCH), the extended channel indicator Generating extended downlink control information indicating a resource block to which a first physical downlink shared channel (PDSCH) is mapped when the E-PDCCH indicates transmission of the E-PDCCH, the basic downlink Mapping control information to a physical downlink control channel (PDCCH), mapping the extended downlink control information to the E-PDCCH, and the PDCCH through a control region of a subframe, and the E -Transmitting the PDCCH and the first PDSCH through the data region of the subframe.
  • E-PDCCH extended-physical downlink control channel
  • PDSCH physical downlink shared channel
  • a method for receiving a control channel in a wireless communication system includes receiving a PDCCH to which basic downlink control information including an extended channel indicator is mapped through a control region of a subframe, and when the extended channel indicator indicates transmission of an E-PDCCH, an extended downlink Receiving the E-PDCCH to which link control information is mapped through a data region of the subframe, and a PDSCH mapped to a resource block indicated by the extended downlink control information through a data region of the subframe Receiving.
  • a base station for transmitting a control channel in a wireless communication system.
  • the base station generates a field configuration unit for configuring an extended channel indicator indicating whether to transmit the E-PDCCH, basic downlink control information including the extended channel indicator, the extended channel indicator is the E-PDCCH
  • the downlink control information (DCI) generation unit for generating extended downlink control information indicating the resource block to which the first PDSCH is mapped, and the basic downlink control information to the physical downlink control channel Maps, maps the extended downlink control information to the E-PDCCH, transmits the PDCCH through a control region of a subframe, and transmits the E-PDCCH and the first PDSCH through a data region of the subframe. It includes a transmission unit.
  • a terminal for receiving a control channel in a wireless communication system receives a PDCCH to which basic downlink control information including an extended channel indicator is mapped through a control region of a subframe, and receives the E-PDCCH to which the extended downlink control information is mapped, a data region of the subframe.
  • a DCI analysis unit for analyzing whether to transmit the E-PDCCH according to the instruction of the extended channel indicator and instructing the reception unit to receive the E-PDCCH.
  • FIG. 1 shows a wireless communication system to which the present invention is applied.
  • FIG. 2 shows a structure of a subframe to which the present invention is applied.
  • FIG. 3 is a diagram illustrating available PDCCH capacity to which the present invention is applied.
  • FIG. 4 is a flowchart illustrating a method of transmitting an extended control channel according to an embodiment of the present invention.
  • FIG. 5 is a flowchart illustrating a method of transmitting a control channel by a base station according to an embodiment of the present invention.
  • FIG. 6 is an explanatory diagram illustrating a configuration of a control channel based on an extended channel indicator according to an embodiment of the present invention.
  • FIG. 7 is an explanatory diagram illustrating a configuration of a control channel based on an extended channel indicator according to another embodiment of the present invention.
  • FIG. 8 is an explanatory diagram illustrating a configuration of a control channel based on an extended channel indicator according to another embodiment of the present invention.
  • FIG. 9 is an explanatory diagram showing a configuration of a control channel based on an extended channel indicator according to another embodiment of the present invention.
  • FIG. 10 is a flowchart illustrating a method for receiving a control channel based on an extended channel indicator by a terminal according to an embodiment of the present invention.
  • FIG. 11 is a block diagram illustrating a terminal and a base station according to an embodiment of the present invention.
  • the present specification describes a communication network, and the work performed in the communication network is performed in a process of transmitting a data and controlling the network in a system (for example, a base station) that manages the communication network, or in a terminal coupled to the network. Work can be done.
  • a system for example, a base station
  • Work can be done.
  • control channel may be interpreted as meaning that control information is transmitted through a specific channel.
  • the control channel may be, for example, a physical downlink control channel (PDCCH) or a physical uplink control channel (PUCCH).
  • PDCH physical downlink control channel
  • PUCCH physical uplink control channel
  • FIG. 1 shows a wireless communication system to which the present invention is applied.
  • the wireless communication system 10 is widely deployed to provide various communication services such as voice and packet data.
  • the wireless communication system 10 includes at least one base station (BS) 11.
  • BS base station
  • Each base station 11 provides a communication service for a specific geographic area 15a, 15b, 15c or frequency domain.
  • the UE 12 may be fixed or mobile and may have a mobile station (MS), a mobile terminal (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, or a PDA. (personal digital assistant), wireless modem (wireless modem), a handheld device (handheld device) may be called other terms.
  • MS mobile station
  • MS mobile terminal
  • MT mobile terminal
  • UT user terminal
  • SS subscriber station
  • PDA personal digital assistant
  • wireless modem wireless modem
  • handheld device handheld device
  • the base station 11 generally refers to a station that communicates with the terminal 12, and includes an evolved-NodeB (eNodeB), a Base Transceiver System (BTS), an Access Point, an femto eNodeB, and a home appliance. It may be called other terms such as a base station (Home eNodeB: HeNodeB), a relay.
  • eNodeB evolved-NodeB
  • BTS Base Transceiver System
  • Access Point an femto eNodeB
  • femto eNodeB a home appliance. It may be called other terms such as a base station (Home eNodeB: HeNodeB), a relay.
  • a cell should be interpreted in a comprehensive sense of a part of the area covered by the base station 11 and encompasses various coverage areas such as megacells, macrocells, microcells, picocells, and femtocells.
  • downlink refers to a communication or communication path from the base station 11 to the terminal 12
  • uplink refers to a communication or communication path from the terminal 12 to the base station 11.
  • the transmitter may be part of the base station 11 and the receiver may be part of the terminal 12.
  • the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-FDMA
  • OFDM-FDMA OFDM-FDMA
  • OFDM-TDMA OFDM-FDMA
  • OFDM-TDMA OFDM-
  • FIG. 2 shows a structure of a subframe to which the present invention is applied.
  • a subframe includes two consecutive slots.
  • the preceding 1, 2, 3 or 4 OFDM symbols of the first slot in the subframe are the control regions to which the PDCCH is mapped, and the remaining OFDM symbols are mapped to the physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the control region may be allocated a control channel such as PCFICH and PHICH.
  • the UE may read data information transmitted through the PDSCH by decoding the PDCCH.
  • the number of OFDM symbols constituting the control region in the subframe can be known through the PCFICH.
  • the PCFICH indicates the first one, two or three OFDM symbols to the control region, and when the N DL RB ⁇ 10, the PCFICH is the first two. 3 or 4 OFDM symbols are indicated to the control region.
  • the DCI may include an uplink or downlink resource allocation field, an uplink power control command field, a control field for paging, a control field for indicating a random access response (RA response), and the like. have.
  • DCI has different uses according to its format, and fields defined in DCI are also different.
  • Table 1 shows DCIs according to various formats.
  • Table 1 DCI format Explanation 0 Used for scheduling of PUSCH (Uplink Grant) One Used for scheduling one PDSCH codeword in one cell 1A Used for simple scheduling of one PDSCH codeword in one cell and random access procedure initiated by PDCCH command 1B Used for simple scheduling of one PDSCH codeword in one cell using precoding information 1C Used for brief scheduling of one PDSCH codeword and notification of MCCH change 1D Used for simple scheduling of one PDSCH codeword in one cell containing precoding and power offset information 2 Used for PDSCH scheduling for UE configured in spatial multiplexing mode 2A Used for PDSCH scheduling of UE configured in long delay CDD mode 2B Used in transmission mode 8 (double layer transmission, etc.) 2C Used in transmission mode 9 (multi-layer transmission) 3 Used to transmit TPC commands for PUCCH and PUSCH with power adjustment of 2 bits 3A Used to transmit TPC commands for PUCCH and PUSCH with single bit power adjustment
  • DCI format 0 is uplink scheduling information, format 1 for scheduling one PDSCH codeword, format 1A for compact scheduling of one PDSCH codeword, and very simple of DL-SCH.
  • Format 1C for scheduling format 2 for PDSCH scheduling in closed-loop spatial multiplexing mode, format 2A for PDSCH scheduling in open-loop spatial multiplexing mode, and uplink channel Formats 3 and 3A for transmission of a transmission power control (TPC) command.
  • TPC transmission power control
  • Each field of the DCI is sequentially mapped to n information bits a 0 to a n-1 . For example, if DCI is mapped to information bits of a total of 44 bits in length, each DCI field is sequentially mapped to a 0 to a 43 .
  • DCI formats 0, 1A, 3, and 3A may all have the same payload size.
  • DCI format 0 may be called an uplink grant.
  • FIG. 3 is a diagram illustrating available PDCCH capacity to which the present invention is applied.
  • the transmitting end 300 performs PDCCH transmission using a spreading sequence determined by a cell ID.
  • the PDCCH capacity should be increased.
  • the base station may transmit the PDCCH in the same manner as in the second embodiment or the third embodiment.
  • the plurality of transmission terminals 301, 302, 303, and 304 may use different cell identifiers cell ID1, cell ID2, cell ID3, and cell ID4. That is, cell division enables frequency band recycling by code division during PDCCH transmission. This increases the PDCCH capacity. This method reduces the size of the cell, so that the terminal frequently performs handover, and there is a possibility that many terminals are placed under the influence of inter-cell interference.
  • each transmitting end may be a base station, a relay, or a remote radio head (RRH) having an independent cell identifier.
  • the remote radiohead transmits a reference signal, for example, a cell-specific reference signal (CRS), using a sequence determined by the cell identifier.
  • the CRS is used for estimation of the downlink channel required for PDCCH reception.
  • the plurality of transmission terminals 311, 312, and 313 may use the same cell ID. Since the multiple transmission terminals 311, 312, 313 share the same cell identifier, while the multiple cells obtain an increase in PDSCH capacity through spatial division, the PDCCH capacity does not increase. When multiple transmitters have the same cell identifier and obtain a spatial division multiplexing gain for the PDSCH, an imbalance in capacity between the PDSCH and the PDCCH is caused, and the overall system capacity is due to a relatively small capacity PDCCH. Alternatively, throughput may be limited.
  • the transmitting end may schedule the PDSCH to E-PDCCH (extended-PDCCH), which is an extended control channel, to expand the capacity of the limited PDCCH.
  • E-PDCCH extended-PDCCH
  • the E-PDCCH may have the meaning of a control channel newly defined for extended performance as well as extended performance.
  • the PDCCH transmitted in the PDSCH region is not limited to being referred to only as an E-PDCCH in terms, and may be used in other terms having the same function or meaning (for example, N-PDCCH (New-PDCCH), X-). May be referred to as PDCCH). Since the data area is allocated more radio resources than the control area, the limit of the capacity of the PDCCH can be overcome by the E-PDCCH. That is, the E-PDCCH may support a large PDCCH transmission capacity without reducing the reception reliability of the PDCCH.
  • the UEs in each cell indicate whether the E-PDCCH exists and indicate the correct region of the resource block to which the E-PDCCH is mapped. indication).
  • the DCI should have a new field related to the E-PDCCH, and a new format of DCI should be defined if necessary.
  • the transmitting end to which the present invention is applied may include a base station, a relay, or a remote radio head.
  • the transmission subject of the control channel will be described as being a base station.
  • FIG. 4 is a flowchart illustrating a method of transmitting an extended control channel according to an embodiment of the present invention.
  • the base station sets a value of an extended channel indicator (ECI) (S400).
  • the extended channel indicator is an information field indicating whether to transmit the E-PDCCH and may be 1 bit. For example, when the value of the extended channel indicator is '1', it indicates that the E-PDCCH is transmitted in the current subframe. On the other hand, if the value of the extended channel indicator is '0', it indicates that the E-PDCCH is not transmitted in the current subframe. On the contrary, if the value of the extended channel indicator is '0', this indicates that the E-PDCCH is transmitted in the current subframe. If the value of the extended channel indicator is '1', the E-PDCCH is not transmitted in the current subframe. You can also indicate.
  • the number of bits of the extended channel indicator or its value may be different.
  • the extended channel indicator may be 2 bits or more, and if the value is '00' as an example, the extended channel indicator may indicate transmission of the E-PDCCH.
  • the base station may inform the terminal dynamically whether the E-PDCCH is transmitted using the extended channel indicator.
  • ECI extended channel indicator
  • the base station generates a basic DCI including the extended channel indicator (S405).
  • the basic DCI may include information fields as shown in the table below.
  • the DCI mapped to the existing PDCCH region is referred to as a basic DCI in the present invention, but the name is not limited thereto and may be used as another term having the same function or meaning.
  • the basic DCI may include a carrier indicator field, a HARQ process number field, a transmission power control command field, a resource block allocation field, and the like, and in particular, includes a 1-bit extended channel indicator field.
  • the extended channel indicator indicates the transmission of the E-PDCCH
  • a field not used in the basic DCI may be unnecessary. Therefore, it is possible to create a more compact DCI by omitting one or more of the information fields used in the basic DCI, and a DCI including an information field defined as shown in Table 3 may be an example. .
  • HARQ process number 3 bits (FDD), 4 bits (TDD) -Transmission power control (TPC) command for PUCCH: 2 bits Downlink assignment index: 2 bits Modulation and coding scheme: 5 bits New data indicator: 1 bit Redundancy version: 2 bits Resource block allocation Local resource allocation: beat Distributed resource allocation: or beat Extended Channel Indicator: 1 bit
  • the information transmitted through the basic DCI is always scheduling information for PDSCH of a specific component carrier (CC), or E belonging to the data region of the same component carrier.
  • CC component carrier
  • the carrier indicator field may not be used as shown in Table 3. That is, the basic DCI may not include the carrier indicator field.
  • local / distributed VRB allocation flag it is predefined by higher layer level signaling or system information such as semi-static signaling such as Radio Resource Control (RRC), so that local VRB allocation or fractional If only one of the VRB allocation rounds is used, it may be omitted as shown in Table 3.
  • RRC Radio Resource Control
  • the resource block allocation scheme may further reduce the number of bits in the resource block allocation field by assigning a resource block of a type requiring a smaller number of bits.
  • resource block allocation schemes may be classified into three types. In type 0 resource allocation, a base station allocates a resource block group (RBG) to a user equipment using a bitmap format. In type 1 resource allocation, a base station allocates a resource block to a terminal at predetermined intervals or periods. In type 2 resource allocation, the base station allocates a resource block as a contiguous constant length region. In Table 2 and Table 3, resource allocation is described on the basis of type 2. Table 3 and resource allocation of resources different from the previously defined types (type 0, type 1, and type 2) requiring a smaller number of bits. Allocations may be defined.
  • a basic DCI format having a smaller number of bits than the DCI format 1A can be generated, and Table 3 shows a carrier indicator in the basic DCI format described in Table 2 above.
  • the local / distributed VRB allocation flag is omitted and only one transmission block (TB) is used.
  • the DCI format which can be newly defined with a smaller number of bits, is also called a compact DCI format in the present invention to distinguish it from other previously defined DCI formats as shown in Table 1. Is not limited to this.
  • the base station If the extended channel indicator indicates transmission of the E-PDCCH, the base station generates an extended DCI (E-DCI) mapped to the E-PDCCH (S410).
  • E-DCI extended DCI
  • the DCI mapped to the E-PDCCH is referred to as an extended DCI (E-DCI) in the present invention, but the name is not limited thereto and may be used as another term having the same function or meaning. There will be.
  • the extended DCI may be defined in various formats as shown in Table 1 above, or may be a newly defined DCI format. Of course, if the extended channel indicator indicates no E-PDCCH transmission, the extended DCI is not generated.
  • the base station maps the basic DCI to the PDCCH and transmits the PDCCH and the E-PDCCH to the terminal by mapping the extended DCI to the E-PDCCH (S415).
  • the PDCCH is transmitted in the control region
  • the E-PDCCH is transmitted in the data region.
  • the terminal monitors the control area (S420). Monitoring means that the terminal decodes the PDCCHs according to the DCI format.
  • the UE finds its own PDCCH by monitoring a set of PDCCH candidates in a column of a control channel element (CCE). This is called blind decoding. For example, if the CRC error is not detected by descrambling its C-RNTI (Cell-Radio Network Temporary Identifier) in the PDCCH and then checking the CRC (Cyclic Redundancy Check), the UE identifies itself with the PDCCH. To detect with PDCCH. In other words, the PDCCH is successfully decoded.
  • CCE control channel element
  • the UE When decoding the PDCCH to which the basic DCI is mapped by monitoring, the UE checks whether the E-PDCCH is transmitted from the extended channel indicator (ECI) in the basic DCI (S425).
  • ECI extended channel indicator
  • the terminal receives the E-PDCCH in the data area (S430). Since the E-PDCCH is transmitted in the data region, the UE can demodulate the E-PDCCH based on a channel estimated from a demodulation reference signal (DM-RS), which the UE receives the PDCCH by monitoring. This may be different from how you do it.
  • DM-RS demodulation reference signal
  • FIG. 5 is a flowchart illustrating a method of transmitting a control channel by a base station according to an embodiment of the present invention.
  • the base station adds a cyclic redundancy check (CRC) for error detection to the basic DCI or the extended DCI (S500).
  • CRC cyclic redundancy check
  • the base station scrambles the RNTI according to the owner or purpose of the PDCCH in the CRC (S505). If the PDCCH for a specific terminal, a unique identifier of the terminal, for example, C-RNTI may be scrambled in the CRC. Alternatively, if the PDCCH is for a paging message transmitted through the PCH, a paging identifier, for example, P-RNTI (P-RNTI) may be scrambled in the CRC.
  • P-RNTI a paging identifier
  • a system information identifier for example, a System Information-RNTI (SI-RNTI)
  • SI-RNTI System Information-RNTI
  • RA-RNTI random access-RNTI
  • Table 4 type Identifier Contents UE-specific C-RNTI Used for unique terminal identification Common P-RNTI Used for paging message SI-RNTI Used for system information RA-RNTI Used for random access response
  • the PDCCH carries control information for a specific UE. If another RNTI is used, the PDCCH carries common control information received by all UEs in a cell.
  • the base station performs channel coding on the basic DCI or extended DCI to which the CRC is added to generate coded data (S510).
  • the base station performs rate matching based on the CCE aggregation unit allocated to the PDCCH format or the E-PDCCH format (S515).
  • the base station modulates the encoded data to generate modulation symbols (S520).
  • the number of modulation symbols constituting one CCE may vary according to CCE aggregation units (one of 1, 2, 4, and 8).
  • the base station maps modulation symbols to physical resource elements (CCE to RE mapping) (S525).
  • ECI Extended Channel Indicator
  • FIG. 6 is an explanatory diagram illustrating a configuration of a control channel based on an extended channel indicator according to an embodiment of the present invention.
  • a subframe constituted by a base station includes a control region 600 and a data region 650, and the PDCCH 605 is transmitted on the control region 600.
  • the primary DCI is mapped to the PDCCH 605, where the primary DCI includes an extended channel indicator indicating E-PDCCH non-transmission. Accordingly, the E-PDCCH is not transmitted on the data region 650, but only the PDSCH 655 scheduled by the basic DCI is transmitted.
  • the RB allocation field included in the basic DCI indicates allocation of RBs for the PDSCH 655.
  • the basic DCI may be a DCI format further including a channel indicator extended to the DCI format mentioned in Table 1, or may be a DCI including an information field as shown in Table 2 above. It may be an example compact DCI format.
  • fields included in the base DCI may be different for each scenario to which the base DCI is applied, and functions of the base DCI may also be different.
  • the basic DCI includes scheduling information or control information for transmission of the E-PDCCH.
  • scheduling information or control information for transmitting the E-PDCCH may be referred to as E-PDCCH header information. That is, the basic DCI directly indicates one or more of a modulation and coding scheme for transmitting E-PDCCH, which can be referred to as E-PDCCH header information, and an RB allocation area.
  • the basic DCI is given as in Table 2 or Table 3, the resource block allocation field of Table 2 or Table 3 indicates a resource block to which the E-PDCCH is mapped.
  • FIG. 7 is an explanatory diagram illustrating a configuration of a control channel based on an extended channel indicator according to another embodiment of the present invention.
  • a subframe configured by a base station includes a control region 700 and a data region 750, and the PDCCH 705 is transmitted on the control region 700.
  • a basic DCI is mapped to the PDCCH 705, where the basic DCI includes an extended channel indicator and E-PDCCH header information indicating transmission of the E-PDCCH 755.
  • the E-PDCCH header information includes a resource block allocation field indicating a resource block allocation area of the E-PDCCH 755. If the extended channel indicator value is 1, the basic DCI includes header information indicating the E-PDCCH 755 rather than the scheduling information of the general PDSCH. On the other hand, if the value of the extended channel indicator is 0, it means that there is no E-PDCCH 755, and therefore, the basic DCI includes scheduling information of a general PDSCH. As such, the information included in the basic DCI may be determined differently according to the determined value of the channel indicator.
  • the E-PDCCH 755 indicated by the PDCCH 705 is transmitted.
  • the extended DCI is mapped to the E-PDCCH 755, and the PDSCH 760 scheduled by the extended DCI is transmitted on the data region 750.
  • the UE To receive the PDSCH 760, the UE first acquires E-PDCCH header information in the basic DCI, and so-called 'hierarchical control information' to obtain an extended DCI of the E-PDCCH 755 from the E-PDCCH header information. Acquisition '.
  • FIG. 8 is an explanatory diagram illustrating a configuration of a control channel based on an extended channel indicator according to another embodiment of the present invention.
  • a subframe constituted by a base station includes a control region 800 and a data region 850, and the PDCCH 805 is transmitted on the control region 800.
  • a basic DCI is mapped to the PDCCH 805, where the basic DCI is an extended channel indicator indicating whether scheduling information (eg, resource block allocation field) for the PDSCH1 860 and the E-PDCCH 855 are transmitted. Include.
  • the basic DCI indicates resource block allocation for PDSCH1 860 and indicates only whether to transmit E-PDCCH 855 as an extended channel indicator. Unlike in FIG. 7, the information included in the basic DCI does not vary according to the value of the determined channel indicator.
  • An extended DCI is mapped to the E-PDCCH 855, which indicates resource block allocation for the PDSCH2 865.
  • the extended DCI format may be any one of several formats defined in Table 1 above, or may be a newly defined DCI format.
  • the non-transmission of the E-PDCCH is instructed, and thus, the first DCI and the second DCI may be mapped to PDCCH1 and PDCCH2 in the control region (region in which the existing PDCCH may exist).
  • the extended channel indicator is equal to 1
  • the first DCI is mapped to PDCCH1 in the control region (an area where an existing PDCCH may exist)
  • the second DCI is E-in the existing data region.
  • Each may be mapped to PDCCH2 present in the PDCCH. That is, all of the plurality of DCIs may be transmitted through the PDCCH, some may be transmitted through the PDCCH, and some may be transmitted through the E-PDCCH.
  • the basic DCI only indicates whether the E-PDCCH 855 is transmitted through the extended channel indicator included in the basic DCI, and resource block allocation for the E-PDCCH 855 is not separately indicated.
  • the UE needs to know the resource block to which the E-PDCCH 855 is mapped.
  • the base station and the terminal (number of resource blocks, etc.) to which the resource block with respect to the E-PDCCH 855 is allocated are defined in advance between the base station and the terminal, or the base station is configured to terminal the region by higher layer signaling different from the DCI. I can let you know.
  • semi-static signaling such as RRC (Radio Resource Control) may be an example of the higher layer signaling.
  • the resource blocks mapped to the E-PDCCH 855 may be cell-specific predefined or indicated by higher layer signaling (eg, Radio Resource Control (RRC) signaling).
  • RRC Radio Resource Control
  • the number of resource block (s) corresponding to the start point y0 of the allocated resource blocks and the length of the allocated resource blocks may be represented.
  • the basic DCI mapped to the PDCCH is allocated and transmitted to the UE-specific resource, but the extended DCI mapped to the E-PDCCH is allocated to the cell-specific resource and transmitted.
  • the UE may recognize that an extended DCI for itself exists in the E-PDCCH 855.
  • the UE may acquire the extended DCI by searching for the E-PDCCH 855 based on cell-specific y0 and y.
  • y0 when the system bandwidth is N DL RB , it may be selected as a resource block of any position.
  • y0 may be predefined for each cell according to a specific rule based on a cell ID.
  • Resource blocks mapped to the E-PDCCH 855 according to the index of the resource block corresponding to y0 may be defined as follows.
  • f RB (N Cell ID ) defines an index of resource blocks in advance for each cell according to a specific rule based on a cell identifier (N Cell ID ).
  • y0 may be predefined or indicated by higher layer signaling.
  • the number y of resource block (s) may be one or two for each terminal, but is not limited thereto.
  • the above examples are merely examples for better understanding of the present invention, and y0 or y may be predefined or indicated by higher layer signaling such as RRC.
  • FIG. 9 is an explanatory diagram showing a configuration of a control channel based on an extended channel indicator according to another embodiment of the present invention. This is an example where the extended channel indicator according to the present invention is 1 and applied to cross carrier scheduling (CCS).
  • CCS cross carrier scheduling
  • a subframe configured by a base station is divided into a plurality of serving cells (serving cell 1 and serving cell 2) in a frequency domain.
  • the serving cell may be defined as an element frequency band that may be aggregated by carrier aggregation based on a multiple component carrier system.
  • the serving cell includes a primary serving cell (PCell) and a secondary serving cell (SCell).
  • the primary serving cell refers to one serving cell that provides security input and NAS mobility information in an RRC connection or re-establishment state.
  • at least one cell may be configured to form a set of serving cells together with the main serving cell, wherein the at least one cell is called a secondary serving cell.
  • the set of serving cells configured for one terminal may consist of only one main serving cell or one main serving cell and at least one secondary serving cell.
  • the serving cell 1 may be a main serving cell, and the serving cell 2 may be a secondary serving cell.
  • the serving cell 1 may be the secondary serving cell and the serving cell 2 may be the main serving cell.
  • the serving cell 1 and the serving cell 2 may both be secondary serving cells.
  • Each serving cell in the time domain includes a control region 900 and a data region 950, and the PDCCH 905 is transmitted on the control region 900 of the serving cell 1.
  • the primary DCI is mapped to the PDCCH 905, and the primary DCI is an extended channel indicator indicating transmission of the E-PDCCH 955 and a resource block for the PDSCH1 960 existing in the data region 950 of the serving cell 1. Contains assignment fields. Since the extended channel indicator is 1, the UE may recognize that the extended DCI will be mapped and transmitted to the E-PDCCH 955.
  • An extended DCI is mapped to the E-PDCCH 955, and the extended DCI includes a resource block allocation field for the PDSCH2 965 present in the data region 950 of the serving cell 2.
  • the basic DCI and the extended DCI may be a DCI defined in the existing or a DCI defined in a new format.
  • the DCI includes a carrier indicator field (CIF) of 0 bits or 3 bits.
  • the carrier indicator field is 0 bits (ie, when the carrier indicator field is not included in the DCI)
  • the corresponding serving cell is the main serving cell, and the DCI may be a basic DCI mapped to the PDCCH 905.
  • the carrier indicator field is 3 bits
  • the corresponding serving cell is a secondary serving cell, and the DCI may be an extended DCI mapped to the E-PDCCH 955.
  • the E-PDCCH of the primary serving cell may indicate the PDSCH for the secondary serving cell.
  • the associated multi-point transmission / reception scheme refers to a method in which a plurality of different base stations or multiple transmission terminals or cells cooperate to perform communication with one terminal. That is, a method in which a plurality of transmitting end cooperates to perform downlink transmission or uplink reception, wherein a plurality of transmitting end cooperates to perform downlink scheduling or uplink scheduling. (uplink scheduling) is included.
  • a plurality of transmission points include a macro cell and a heterogeneous cell (for example, a pico cell, a femto cell, or a remote radio head).
  • the basic DCI may be for a macro cell
  • the extended DCI may be for a heterogeneous cell.
  • each DCI may be an existing DCI format or may be a newly defined compact DCI.
  • DCI segmentation means splitting one DCI into two DCI segments. If the number of bits of the DCI is too large to occupy a large capacity of the PDCCH, the base station may divide the DCI into a plurality of DCI fragments by DCI partitioning, some of which may be mapped to the PDCCH, and some to the E-PDCCH. As a result, the overhead of the control region can be reduced. As an example, the base station may map the first DCI fragment by DCI partitioning to the PDCCH and the second DCI fragment to the E-PDCCH.
  • the first DCI fragment may include information fields as shown in the following table that various DCI formats (1 / 1A / 1B / 1D / 2 / 2A / 2B / 2C, etc.) commonly include, but are not limited thereto.
  • Carrier indicator 0 or 3 bits HARQ process number: 3 bits (FDD), 4 bits (TDD) -Transmission power control (TPC) command for PUCCH: 2 bits Downlink assignment index: 2 bits Modulation and coding scheme: 5 bits New data indicator: 1 bit Redundancy version: 2 bits Extended Channel Indicator: 1 bit
  • the CRC is added to the first DCI fragment based on common information fields as shown in Table 6 and mapped to the PDCCH.
  • the second DCI fragment may be obtained by adding a CRC to the remaining information fields except for the information fields of Table 6.
  • FIG. 10 is a flowchart illustrating a method for receiving a control channel based on an extended channel indicator by a terminal according to an embodiment of the present invention.
  • the UE monitors PDCCH candidates and receives a PDCCH (S1000).
  • the primary DCI is mapped to the PDCCH, and the primary DCI includes an extended channel indicator.
  • the terminal checks whether the extended channel indicator indicates transmission or non-transmission of the E-PDCCH (1005). If the extended channel indicator indicates the non-transmission of the E-PDCCH, the terminal does not perform the reception operation of the E-PDCCH. On the other hand, if the extended channel indicator indicates the transmission of the E-PDCCH, the UE checks the location of the resource to which the E-PDCCH is mapped (S1010).
  • the terminal identifies the location of the resource to which the E-PDCCH is mapped based on resource block allocation indicated by the basic DCI.
  • the resource block allocation field of the basic DCI is used for transmission of header information of the E-PDCCH without indicating the PDSCH of the current subframe.
  • the basic DCI includes a resource block allocation field indicating a resource block of the E-PDCCH.
  • the resource block allocation field of Table 2 or Table 3 indicates a resource block to which the E-PDCCH is mapped.
  • the terminal confirms the start point of the resource block and the length of the resource block (s) for the E-PDCCH specified by the protocol or higher layer signaling predefined by the base station.
  • the resource block allocation field of the basic DCI indicates the PDSCH of the current subframe.
  • the UE may receive the E-PDCCH based on a start point and a length of a predefined resource block even without scheduling information regarding the E-PDCCH.
  • the starting point of the resource block of the E-PDCCH and the length of the resource block (s) may be determined based on, for example, Table 5 above.
  • the terminal receives the E-PDCCH mapped to the location of the identified resource (S1015).
  • the process of receiving the E-PDCCH is a reverse process of FIG. 5 and may include the following process.
  • the UE demaps a physical resource element into a modulation symbol.
  • the terminal demodulates the modulation symbol to generate rate matched data.
  • the UE generates rate data by performing rate dematching according to the CCE aggregation unit allocated to the E-PDCCH format.
  • the base station decodes the encoded data, descrambles with a specific RNTI, and then obtains the extended DCI.
  • the extended DCI includes information on the resource block to which the PDSCH is mapped, that is, the resource block allocation field.
  • the terminal receives the PDSCH mapped to the resource block indicated by the extended DCI (S1020). If the basic DCI includes a resource block allocation field for a PDSCH indicated from a common channel other than the E-PDCCH, that is, the basic DCI, the UE transmits a PDSCH indicated from the basic DCI to the PDSCH indicated by the extended DCI. Can be received with.
  • the PDSCHs may be received on the same serving cell or may be received on different serving cells by intercarrier scheduling.
  • FIG. 11 is a block diagram illustrating a terminal and a base station according to an embodiment of the present invention.
  • the terminal 1100 includes a receiver 1105 and a DCI analyzer 1110.
  • the receiver 1105 performs monitoring of the PDCCH in the control region of the subframe and receives the PDCCH for the terminal 1100.
  • the receiver 1105 may receive the E-PDCCH according to the instruction of the DCI analyzer 1110. For example, when the DCI analyzer 1110 instructs reception of the E-PDCCH, the receiver 1105 receives the E-PDCCH mapped to the resource blocks specified by the starting point y0 and the length y in the data area. If the DCI analyzer 1110 does not instruct the reception of the E-PDCCH, the receiver 1105 does not receive the E-PDCCH.
  • the procedure of receiving the PDCCH, the E-PDCCH or the PDSCH by the receiver 1105 may include, for example, the processes of steps S100 to S1020 of FIG. 10.
  • the DCI analyzer 1110 analyzes information fields in the basic DCI mapped to the PDCCH. For example, the DCI analyzer 1110 checks whether a channel indicator extended in the basic DCI indicates transmission or non-transmission of the E-PDCCH. If the extended channel indicator indicates the transmission of the E-PDCCH, the DCI analyzer 1110 instructs the receiver 1105 to receive the E-PDCCH.
  • the receiver 1105 may recognize an area of the resource block mapped to the E-PDCCH from the resource block allocation field in the basic DCI. Alternatively, the reception unit 1105 may receive the E-PDCCH based on the region of the resource block predefined by the base station 1150. Alternatively, the reception unit 1105 may receive the E-PDCCH from the region of the resource block designated by higher layer signaling. In this case, the starting point and the length of the resource block may be determined based on, for example, Table 5 above.
  • the DCI analyzer 1110 may check the extended DCI mapped to the E-PDCCH. If the DCI is confirmed, the DCI analyzer 1110 may know the resource block of the PDSCH.
  • the base station 1150 includes a field configuration unit 1155, a DCI generation unit 1160, and a transmission unit 1165.
  • the field constructor 1155 configures information fields in the basic DCI and information fields in the extended DCI.
  • the field organizer 1155 sets an extended channel indicator which is one of the information fields in the basic DCI.
  • the extended channel indicator is a 1-bit information field indicating transmission or non-transmission of the E-PDCCH for the terminal 1100. For example, if transmission of the E-PDCCH is scheduled, the field configuration unit 1155 sets the extended channel indicator to 1, and if the transmission of the E-PDCCH is not scheduled, the field configuration unit 1155 is extended.
  • the channel indicator may be set to 0. On the contrary, when the transmission of the E-PDCCH is scheduled, the field configuration unit 1155 sets the extended channel indicator to 0, and the field configuration when the transmission of the E-PDCCH is not scheduled.
  • the unit 1155 may set the extended channel indicator to one.
  • the field construction unit 1155 selectively configures an E-PDCCH header information or a resource block assignment field (hereinafter, referred to as a resource block assignment field for the E-PDCCH) indicating the resource block to which the E-PDCCH is mapped. For example, if the extended channel indicator is 0, since the E-PDCCH is not transmitted, the field configuration unit 1155 does not configure resource block allocation field or E-PDCCH header information for the E-PDCCH. On the other hand, if the extended channel indicator is 1, the field configuring unit 1155 configures resource block allocation field E-PDCCH header information for the E-PDCCH in the basic DCI or does not configure separately.
  • a resource block assignment field for the E-PDCCH indicating the resource block to which the E-PDCCH is mapped. For example, if the extended channel indicator is 0, since the E-PDCCH is not transmitted, the field configuration unit 1155 does not configure resource block allocation field or E-PDCCH header information for the E-PDCCH. On the other hand
  • the field configuration unit 1155 configures the resource block allocation field for the E-PDCCH in the basic DCI. I never do that. In this case, however, the field configuration unit 1155 may configure a resource block allocation field for the PDSCH in the basic DCI.
  • the field constructor 1155 may configure a resource block allocation field of the extended DCI.
  • the resource block allocation field of the extended DCI indicates a PDSCH on the data region of the current subframe, which may be the same as or different from the serving cell to which the E-PDCCH is transmitted (see FIG. 9).
  • the field component 1155 may split one DCI into a plurality of DCI fragments, in which case one DCI fragment may be a basic DCI and the other DCI fragment may be an extended DCI.
  • the basic DCI may be defined as shown in Table 6 above.
  • the DCI generation unit 1160 generates a basic DCI and an extended DCI including information fields.
  • the transmitter 1165 maps the basic DCI to the PDCCH in the control region and transmits the same to the terminal 1100, and maps the extended DCI to the E-PDCCH in the data region and transmits the same to the terminal 1100. Specifically, the transmitter 1165 adds a CRC for error detection to the basic DCI, and scrambles the RNTI specific to the terminal 1100 of the PDCCH. The transmitter 1165 performs channel coding on the basic DCI to which the CRC is added to generate coded data, and performs rate matching based on the CCE aggregation unit allocated to the PDCCH format.
  • the transmitter 1165 modulates the encoded data to generate modulation symbols, and maps the modulation symbols to physical resource elements and transmits the modulation symbols to the terminal 1100.
  • the transmitter 1165 processes the expanded DCI based on the same procedure as that of the basic DCI.
  • a processor such as a microprocessor, a controller, a microcontroller, an application specific integrated circuit (ASIC), or the like according to software or program code coded to perform the function.
  • ASIC application specific integrated circuit

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Abstract

La présente invention concerne un appareil et un procédé de transmission d'un canal de commande dans un système de communication sans fil. Le procédé de transmission d'un canal de commande dans un système de communication sans fil selon l'invention comprend les étapes qui consistent à : générer des informations de commande de liaison descendante de base qui comprennent un indicateur de canal amélioré indiquant la transmission d'un canal de commande physique de liaison descendante amélioré (E-PDCCH) ; générer des informations de commande de liaison descendante améliorées qui indiquent le bloc de ressources auquel est mappé un canal physique partagé de liaison descendante (PDSCH) ; mapper les informations de commande de liaison descendante de base à un canal de commande physique de liaison descendante (PDCCH), et mapper les informations de commande de liaison descendante améliorées au canal E-PDCCH ; et transmettre le canal PDCCH par l'intermédiaire d'une zone de commande d'une sous-trame et les canaux E-PDCCH et PDSCH par l'intermédiaire d'une zone de données de la sous-trame.
PCT/KR2012/005542 2011-07-13 2012-07-12 Appareil et procédé de transmission d'un canal de commande dans un système de communication sans fil WO2013009109A2 (fr)

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