WO2013002512A2 - Dispositif et procédé de transmission d'un canal de commande dans un système de communication sans fil - Google Patents

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

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WO2013002512A2
WO2013002512A2 PCT/KR2012/004884 KR2012004884W WO2013002512A2 WO 2013002512 A2 WO2013002512 A2 WO 2013002512A2 KR 2012004884 W KR2012004884 W KR 2012004884W WO 2013002512 A2 WO2013002512 A2 WO 2013002512A2
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pdcch
dci
field
mixed
resource allocation
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PCT/KR2012/004884
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English (en)
Korean (ko)
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WO2013002512A3 (fr
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박경민
홍성권
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주식회사 팬택
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

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 attempts to decode 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 configuring a new format of downlink control information for expanding the capacity of a downlink control channel in a wireless communication system.
  • Another technical problem of the present invention is to provide an apparatus and method for providing a new function to the conventional downlink control information using an unused code point.
  • Another technical problem of the present invention is to provide an apparatus and method for configuring a format of downlink control information indicating an enhanced downlink control channel (E-PDCCH).
  • E-PDCCH enhanced downlink control channel
  • a method of transmitting a control channel by a base station includes setting a value of a mixed resource allocation field to a reserved code point indicating transmission of an enhanced physical downlink control channel (E-PDCCH), and indicating a resource to which the E-PDCCH is mapped.
  • E-PDCCH enhanced physical downlink control channel
  • a base station for transmitting a control channel.
  • the base station sets a value of a mixed resource allocation field to a surplus code point indicating transmission of an E-PDCCH and configures an E-PDCCH resource allocation field indicating a resource to which the E-PDCCH is mapped;
  • a DCI generation unit for generating downlink control information including a mixed resource allocation field and the E-PDCCH resource allocation field, and a PDCCH to which the downlink control information is mapped to a UE in a control region, and transmitting the E-PDCCH It includes a transmission unit for transmitting to the terminal on the data area.
  • a terminal for receiving a control channel receives a PDCCH to which downlink control information is mapped based on PDCCH monitoring from a base station, and a mixed resource allocation field in which the downlink control information indicates a redundant code point and an E-PDCCH are mapped. And a DCI analysis unit for checking whether the format includes the E-PDCCH resource allocation field indicating the resource.
  • the receiver may receive the E-PDCCH on the resource and receive a PDSCH indicated by the E-PDCCH.
  • a method for receiving a control channel by a terminal includes receiving, from a base station, a PDCCH mapped with downlink control information based on PDCCH monitoring, a mixed resource allocation field indicating the downlink control information, and a resource mapped with an E-PDCCH. Checking whether the format includes an E-PDCCH resource allocation field; receiving the E-PDCCH on a resource indicated by the E-PDCCH resource allocation field; and receiving a PDSCH indicated by the E-PDCCH. Steps.
  • DCI format 1A which is a format of the smallest downlink control information (DCI) used for the control of the physical downlink control channel (PDCCH) and a format commonly used for all transmission modes.
  • DCI downlink control information
  • PDCCH physical downlink control channel
  • 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 an exemplary view illustrating PDCCH monitoring to which the present invention is applied.
  • FIG. 4 illustrates a CCE that may be a starting point of a terminal specific search space to which the present invention is applied.
  • 5 is a diagram illustrating available PDCCH capacity to which the present invention is applied.
  • FIG. 6 is a flowchart illustrating a method of configuring a control channel by a base station according to an embodiment of the present invention.
  • FIG. 7 is a flowchart illustrating a method of configuring a control channel by a base station according to another embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a mapping relationship between PDCCH, E-PDCCH and PDSCH according to an embodiment of the present invention.
  • FIG. 9 is a flowchart illustrating a method of receiving a control channel by a terminal according to an embodiment of the present invention.
  • FIG. 10 is a block diagram illustrating a terminal and a base station according to an embodiment of the present invention.
  • the present specification describes a wireless communication network
  • the operation performed in the wireless communication network is performed in the process of controlling the network and transmitting data in the system (for example, the base station) that is in charge of the wireless communication network, or the corresponding wireless Work may be done at the terminal coupled to the network.
  • 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.
  • Each base station 11 provides a communication service for a particular geographic area or frequency area (generally called a cell) 15a, 15b, 15c.
  • the cell can in turn be divided into a number of regions (called sectors).
  • the mobile station (MS) 12 may be fixed or mobile, and may include a user equipment (UE), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a PDA. (personal digital assistant), wireless modem (wireless modem), a handheld device (handheld device) may be called other terms.
  • the base station 11 generally refers to a station communicating with the terminal 12, and includes an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, an femto eNB, and a home It may be called other terms such as a base station (Home eNB: HeNB), a relay, and the like.
  • the 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-
  • each cell does not consider other cells and the cell is to be communicated between the base station and the terminal while maintaining a frequency reuse factor of 1 at the same time and frequency band.
  • the performance becomes very poor due to signal distortion and signal interference from other cells due to power reduction of the received signal.
  • CoMP Coordinated Multiple Point
  • the associated multi-transmitter scheme refers to a method in which a plurality of different base stations or multiple transmit stages 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.
  • the linked multi-transmitter method provides transmit power gain and signal sensitivity to terminals with weak signal strength compared to terminals in the cell center region or in a region where signal reception sensitivity is poor in an intercell boundary region or an area where signal reception sensitivity is poor. It can improve the transmission rate of the whole system by effectively eliminating the influence of signal interference.
  • MIMO Multiple Input Multiple Output
  • the multi-antenna transmission / reception scheme increases the number of transmitting antennas and receiving antennas at the same time by collecting fragmented pieces of data received from multiple antennas without relying on a single antenna path to receive a single whole message. Since the theoretical channel transmission capacity increases in proportion to the number, the frequency efficiency is improved.
  • the multi-transmitter scheme associated with the multi-antenna transmission and reception scheme it is possible to increase the strength of a received signal of a terminal located at a cell boundary or a terminal located in a region having poor reception sensitivity.
  • FIG. 2 shows a structure of a subframe to which the present invention is applied.
  • a subframe includes two consecutive slots. Up to three OFDM symbols of the first slot in the subframe are the control region to which the PDCCH is mapped, and the remaining OFDM symbols are the data region to which the PDSCH is mapped.
  • 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 control region includes 3 OFDM symbols.
  • the number of OFDM symbols included in the control region in the subframe can be known through the PCFICH.
  • the control region is composed of a stream of a plurality of control channel elements (CCEs).
  • CCEs control channel elements
  • 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.
  • the CCE may correspond to nine resource element groups.
  • Resource element groups are used to define the mapping of control channels to resource elements.
  • one resource element group may consist of four resource elements.
  • a plurality of PDCCHs may be transmitted in the control region.
  • the PDCCH includes control information such as scheduling assignment.
  • the PDCCH is transmitted on the aggregation of one or several consecutive control channel elements (CCEs).
  • CCEs control channel elements
  • the format of the PDCCH and the number of bits of the PDCCH are determined according to the number of CCEs constituting the CCE aggregation unit.
  • the number of CCEs used for PDCCH transmission is called a CCE aggregation level.
  • the CCE aggregation unit is a CCE unit for searching for a PDCCH.
  • the size of a CCE aggregation unit is defined by the number of adjacent CCEs.
  • the CCE aggregation unit may be an element of ⁇ 1, 2, 4, 8 ⁇ .
  • the following table shows an example of the format of the PDCCH according to the CCE aggregation unit and the number of bits of the PDCCH available.
  • DCI downlink control information
  • the DCI transmits uplink or downlink scheduling information, an uplink power control command, control information for paging, control information for indicating a random access response, and the like.
  • DCI has different uses according to its format, and fields defined in DCI are also different.
  • Table 2 shows DCIs according to various formats.
  • DCI format 0 indicates uplink resource allocation information, format 1 for scheduling one PDSCH codeword, format 1A for compact scheduling of one PDSCH codeword, and DL-SCH.
  • Format 1C for very simple scheduling, format 2 for PDSCH scheduling in closed-loop spatial multiplexing mode, format 2A for PDSCH scheduling in open-loop spatial multiplexing mode, uplink
  • formats 3 and 3A for the transmission of Transmission Power Control (TPC) commands for channels.
  • 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.
  • a plurality of PDCCHs may be transmitted in one subframe.
  • the UE demaps the physical resource elements constituting the control region of one subframe to CCE to obtain a logical CCE sequence.
  • the UE monitors the PDCCHs in the CCE column.
  • monitoring means that the terminal attempts to decode each of the PDCCHs according to the monitored DCI format.
  • the base station does not provide the terminal with information on where the corresponding PDCCH is in the CCE column.
  • the UE finds its own PDCCH by monitoring a set of PDCCH candidates in the CCE column. This is called blind decoding. For example, if a CRC error is not detected by descrambling its C-RNTI in a corresponding PDCCH and then performing a cyclic redundancy check (CRC) check, the UE detects it as its PDCCH.
  • CRC cyclic redundancy check
  • the UE monitors a set of PDCCH candidates in every subframe in order to receive data transmitted to the UE at an active time. That is, in the DRX mode, the UE wakes up in the monitoring interval in every DRX cycle and monitors the set of PDCCH candidates in the subframe corresponding to the monitoring interval.
  • a subframe in which PDCCH monitoring is performed is called a non-DRX subframe.
  • the UE must perform blind decoding on all CCEs of the non-DRX subframe in order to receive the PDCCH transmitted thereto. Since the UE does not know which PDCCH format is to be transmitted, it is necessary to decode all PDCCHs in the possible CCE aggregation units until the blind decoding of the PDCCH succeeds in every non-DRX subframe.
  • FIG 3 is an exemplary view illustrating PDCCH monitoring to which the present invention is applied.
  • CCE aggregation unit L is ⁇ 1,2,4,8 ⁇ , and there are four types. If the CCE aggregation unit is 1, the UE may perform blind decoding on all CCE indexes. Even when the CCE aggregation unit is 2, 4, or 8, the UE may perform blind decoding on all CCE indexes. That is, the UE may perform blind decoding at every CCE index for each CCE aggregation unit.
  • the UE attempts blind decoding for all four C-RNTI, P-RNTI, SI-RNTI, and RA-RNTI. In addition, the UE attempts blind decoding for all DCI formats to be monitored.
  • the base station may not allocate PDCCH carrying specific control information randomly on the CCE column, but may allocate the CDC column to a specific position, a specific starting point or a specific range. In this case, the UE may perform blind decoding at a specific location, from a specific starting point, or only in a specific range to search for the PDCCH. Therefore, the number of detection attempts due to blind decoding can be reduced.
  • a specific range on the CCE column is defined as a search space.
  • the search space is a space for searching for a PDCCH on a logical CCE column.
  • the set of monitored PDCCH candidates is defined according to the search space.
  • a search space is a collection of contiguous or non-contiguous CCEs from a specific starting location within a CCE column according to CCE aggregation units. Search spaces are defined according to CCE aggregation units. The positions of the PDCCH candidates occur independently in the search space for each CCE aggregation unit. That is, the specific starting point where the PDCCH may be located for each CCE aggregation unit may vary.
  • control information carried on the PDCCH may be divided into common control information received by all terminals in the cell and terminal specific control information received by a specific terminal in the cell.
  • the base station multiplexes common control information and terminal specific control information for a plurality of terminals and transmits them.
  • the search space may be divided into a common search space for common control information and a UE-specific search space for terminal specific control information.
  • Common control information includes control information for a paging message, control information for system information, control information for changing system information, control information for random access response, and the like.
  • the common control information may be scrambled with RNTI for each common control information in the CRC. For example, P-RNTI, SI-RNTI, RA-RNTI, etc. may be scrambled according to each common control information.
  • the common search space may vary for each subframe or may be the same for each subframe.
  • the starting point of the common search space is the same for all terminals in the cell. That is, the starting point of the common search space is fixed for all terminals in the cell.
  • the starting point of the common search space may be the same for all cells. Alternatively, starting points of different common search spaces may be set for each cell for randomization of inter-cell interference.
  • the starting point of the common search space may be preset between the base station and the terminal, or the base station may inform the terminal through RRC signaling or system information.
  • a PDCCH carrying terminal specific control information is mapped to the terminal specific search space.
  • One UE specific search space may be defined for one or a plurality of component carriers for each component carrier (CC) configured in the terminal.
  • the UE can reduce the number of detection attempts by blind decoding the set of PDCCH candidates carrying the UE-specific control information only in the UE-specific search space.
  • the UE finds a starting point of the UE-specific search space and attempts blind decoding on a set of PDCCH candidates carrying UE-specific control information from the starting point.
  • the starting point of the UE-specific search space may be different for each terminal, every subframe, and every CCE aggregation unit.
  • the common search space is a search space monitored by all terminals in a cell
  • the terminal specific search space is a search space monitored by a specific terminal.
  • the terminal monitors both the common search space and the terminal specific search space.
  • the common search space and the terminal specific search space may overlap.
  • the starting point of the terminal specific search space will be described.
  • every CCE on the CCE column can be a starting point of a UE-specific search space for each CCE aggregation unit. For example, when the total number of CCE constituting the logical CCE column in the k-th sub-frame la N CCE, k, k a terminal number of a specific search space available on the CCE column of the subframe is N CCE, k and same.
  • FIG. 4 illustrates a CCE that may be a starting point of a terminal specific search space to which the present invention is applied.
  • the total number of CCEs constituting the logical CCE column in the k-th subframe is N CCE, k .
  • CCEs are indexed from 0 to 'N CCE, k-1 '.
  • the starting point (see arrow) of the terminal specific search space satisfies the following equation.
  • I is an index of CCE and L is a CCE aggregation unit.
  • the CCE aggregation unit is L, the number of UE-specific search spaces available on the CCE column of the kth subframe is to be. It can be seen that the number of possible terminal specific search spaces is reduced. Therefore, it is possible to lower the probability that the specific search space of one terminal and the specific search space of another terminal overlap.
  • overhead may be reduced.
  • the set of CCE indexes that may be the starting point Z k (L) of the UE-specific search space in the k-th subframe may be represented by the following equation.
  • the following table is an example of a search space.
  • the size L of the CCE aggregation unit and the number of candidates M (L) of the PDCCH shown in the following table are for illustrative purposes and not limitations.
  • the UE-specific search space supports the CCE aggregation unit L ⁇ ⁇ 1,2,4,8 ⁇
  • the common search space supports the CCE aggregation unit L ⁇ ⁇ 4,8 ⁇ .
  • the size of the search space is determined according to the size of the CCE aggregation unit and the number of PDCCH candidates. That is, the size of the search space is an integer multiple of the size of the CCE aggregation unit or the number of PDCCH candidates.
  • 5 is a diagram illustrating available PDCCH capacity to which the present invention is applied.
  • a transmitting end 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 501, 502, 503, and 504 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 channel state information-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.
  • a plurality of transmission terminals 511, 512, and 513 may use the same cell ID. Since the multiple transmission terminals 511, 512, 513 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 PDSCH is scheduled to the E-PDCCH which is an enhanced control channel.
  • the E-PDCCH may be referred to as an extended control channel. 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. Meanwhile, since the E-PDCCH is mapped to the data region, a new format of DCI capable of indicating the E-PDCCH is required.
  • the transmitting end to which the present invention is applied may include a base station, a relay, or a remote radio head (RRH).
  • a base station a relay
  • a remote radio head RRH
  • the transmission subject of the control channel will be described as being a base station, but this is only an example and the transmission subject of the control channel is a relay. Or a remote radiohead. That is, all operations performed by the base station below may be performed by the relay or the remote radio head in the same manner.
  • FIG. 6 is a flowchart illustrating a method of configuring a control channel by a base station according to an embodiment of the present invention.
  • the base station specifically sets a hybrid resource allocation field for informing that the E-PDCCH for the UE is scheduled (S600).
  • Each value represented by the mixed resource allocation field is called a resource indication value (RIV) or code point.
  • RIV resource indication value
  • the code point will be referred to collectively.
  • the code point used for resource allocation is called a used code point, and the remaining code point not used for resource allocation is called a reserved code point. That is, a surplus code point is a code point that is not used for resource allocation.
  • the downlink system bandwidth is 1,4 MHz (6 RBs), 3 MHz (15 RBs), 5 MHz (25 RBs), 10 MHz (50 RBs), 15 MHz (75 RBs), 20 MHz (100 RBs), respectively, 11, 8, 187, 773, There may be 1246, 3132 redundant sign points.
  • the base station sets the value of the mixed resource allocation field to one of the redundant code points.
  • the mixed resource allocation field set to the redundant code point indicates transmission of the E-PDCCH.
  • the base station may set all bits of the mixed resource allocation field to 1 and set a localized / distributed VRB assignment flag to 1.
  • This combination of settings is a setting that cannot logically exist at the same time, but can be used as a means for indicating scheduling of the E-PDCCH. Therefore, if the DCI received by the UE includes a mixed resource allocation field indicating a redundant code point and includes a combination of the above settings, the UE may recognize scheduling of the E-PDCCH.
  • the base station generates a mixed DCI including the mixed resource allocation field (S605).
  • Mixed DCI is scheduling information about E-PDCCH.
  • the format of the mixed DCI may be a new format or some modification may be applied for scheduling of the E-PDCCH as the same format as the existing 1A.
  • the following table is an example of a mixed DCI including control information fields.
  • Table 4 Component Carrier Indicator: 0 or 3 bits Format 0 / 1A Identification Flag: 1 bit is set to 1 Mixed Resource Allocation Field: Bits are all set to 1, or set to other redundant values Local / Distributed Allocation Flags: 1 bit If all resource allocation fields are set to 1, it is set to 1. Otherwise set to 0 -E-PDCCH resource allocation field: bits All remaining bits: all set to a specific fixed value (0 or 1)
  • the component carrier indicator indicates the component carrier to which the mixed DCI is applied.
  • the format 0 / 1A identification flag is 1 bit. If the value is 0, the DCI indicates the format 0, and if the value is 1, the DCI indicates the format 1A. If the DCI is a mixed DCI, the value is set to 1. Can be.
  • the mixed resource allocation fields are all set to 1, and the local / distributed allocation flag is set to 1 as 1 bit. If the values of the respective fields are set to the specific values as described above, the DCI indicates the E-PDCCH as the mixed DCI, and the base station and the terminal can identify the mixed DCI.
  • the UE may receive the E-PDCCH only when the UE knows the resource on which the E-PDCCH is transmitted. Therefore, in the mixed DCI, the number of bits of the E-PDCCH resource allocation field indicating a resource to which the E-PDCCH is mapped must be additionally defined.
  • the E-PDCCH resource allocation field may be made of bits of other fields constituting DCI format 1A.
  • bits constituting a modulation and coding scheme (MCS) field may be used as an E-PDCCH resource allocation field.
  • E-PDCCH is basically a channel for transmitting control information, and thus does not require a high level of MCS.
  • the MCS for the E-PDCCH may be predefined at a modulation level such as low level MCS, for example Quadrature Phase Shift Keying (QPSK).
  • QPSK Quadrature Phase Shift Keying
  • the base station since the MCS of the E-PDCCH is fixed to a specific value between the terminal and the base station, the base station does not need to separately inform the terminal of the MCS. That is, since the 5-bit resource constituting the MCS field in the DCI may be wasted without meaning, it may be used instead as an E-PDCCH resource allocation field indicating a resource on which the E-PDCCH is transmitted.
  • fields such as a HARQ process number, a new data indicator (NDI), a redundancy version, and the like in the DCI may be used instead as the E-PDCCH resource allocation field.
  • the sum of the bits constituting the MCS field, the HARQ process number field, the new data indicator field, and the duplicate version fields is 11 bits (for FDD system) or 12 bits (for TDD system), so 11-bit or 12-bit E- PDCCH resource allocation field may be defined.
  • the total number of bits that can be made into the E-PDCCH resource allocation field is 13; It can be a bit (in case of FDD system) or 14 bits (in case of TDD system). According to this, the number of bits in the E-PDCCH resource allocation field is the same as the number of bits in the mixed resource allocation field. Can be Therefore, when scheduling an E-PDCCH with a mixed DCI, the base station does not have to restrict the resources used for transmitting the E-PDCCH. On the other hand, all bits left after creating the E-PDCCH resource allocation field all indicate a specific fixed value (1 or 0).
  • Resource allocation can be classified into three types.
  • type 0 resource allocation the base station allocates a resource block (RB) to the terminal using a bitmap format.
  • type 1 resource allocation a base station allocates a resource block to a terminal at predetermined intervals or periods.
  • type 2 resource allocation the base station allocates a resource block as a contiguous constant length region. The number of bits required for Type 2 resource allocation depends on the bandwidth of the system, with a maximum of 13 bits. That is, the base station may make 13 bits into the E-PDCCH resource allocation field.
  • the mixed DCI may be configured in other forms proposed in Table 6 or below.
  • the base station transmits the PDCCH to which the mixed DCI is mapped to the terminal in the control region, and transmits the E-PDCCH to the terminal in the data region. This specifically includes the process of step S610 or less.
  • the base station adds a cyclic redundancy check (CRC) for error detection to the mixed DCI (S610).
  • CRC cyclic redundancy check
  • the base station scrambling an identifier (referred to as a Radio Network Temporary Identifier (RNTI)) according to an owner or a purpose of the PDCCH in the CRC (S615).
  • RNTI Radio Network Temporary Identifier
  • the PDCCH is for a specific terminal, a unique identifier of the terminal, for example, a C-RNTI (Cell-RNTI) may be scrambled in the CRC.
  • Cell-RNTI a paging identifier
  • P-RNTI paging identifier, for example, P-RNTI
  • a system information identifier for example, a System Information-RNTI (SI-RNTI)
  • SI-RNTI System Information-RNTI
  • RA-RNTI random access-RNTI
  • C-RNTI is used for unique terminal identification.
  • the base station performs channel coding on the mixed DCI to which the CRC is added to generate coded data (S620).
  • the base station performs rate matching according to the CCE aggregation unit allocated to the PDCCH format (S625).
  • the base station modulates the encoded data to generate modulation symbols (S630).
  • 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) (S635).
  • Table 6 shows another example of a mixed DCI according to the present invention.
  • Table 6 Component Carrier Indicator: 0 or 3 bits Format 0 / 1A Identification Flag: 1 bit is set to 1 Mixed Resource Allocation Field: Bits are all set to 1, or set to other redundant values Local / Distributed Allocation Flags: 1 bit If all resource allocation fields are set to 1, it is set to 1. Otherwise set to 0 E-PDCCH Resource Allocation Field: or bits All remaining bits: all set to a specific fixed value (0 or 1)
  • the base station sets the value of the format 0 / 1A identification flag to 1, sets the mixed resource allocation field to all 1 as shown in Table 4, and the local / distributed allocation flag. Is set to 1.
  • the E-PDCCH resource allocation field should be defined, and if the constraint is placed on the resource scheduling of the E-PDCCH (or the allocated band of the E-PDCCH), the number of bits of the E-PDCCH resource allocation field may be reduced. This is to support protection such as stronger channel coding on the E-PDCCH by reducing the amount of information included in the E-PDCCH. For example, if a high level of MCS and spreading is supported for the E-PDCCH, the UE may receive an E-PDCCH having a high signal to interference noise ratio (SINR).
  • SINR signal to interference noise ratio
  • the amount of resources required for the E-PDCCH transmission or the transmission area of the E-PDCCH is based on system parameters such as system bandwidth, transmission scheme, and the number of transmit antennas used for transmission. Is determined.
  • resources required for transmission of the E-PDCCH may be specified in a data region by RRC signaling. Therefore, the amount of resources required for E-PDCCH transmission is not variable. Since 1, 2, 4, or 8 CCEs are allocated to the PDCCH, it is possible to fix the amount of resources used for E-PDCCH transmission or to vary only within a limited range.
  • Equation 3 the number of bits of the required E-PDCCH resource allocation field is shown in Equation 3.
  • the mixed DCI including the E-PDCCH resource allocation field may be configured as shown in Table 6.
  • Table 7 is another example of a mixed DCI according to the present invention.
  • the base station sets the value of the format 0 / 1A identification flag to 1, sets the mixed resource allocation field to all 1 as shown in Table 4, and the local / distributed allocation flag. Is set to 1.
  • the E-PDCCH resource allocation field should be defined, and if the constraint is placed on the resource scheduling of the E-PDCCH (or the allocated band of the E-PDCCH), the number of bits of the E-PDCCH resource allocation field may be reduced. For example, if the number S of consecutively allocated resource blocks is variable, such as ⁇ 1, 2, 3, 4 ⁇ or ⁇ 1, 2, 4, 8 ⁇ , the base station performs resource in the same manner as type 2 resource allocation. In this case, consider only the case where the number of resources is limited.
  • Equation 4 the number of bits of the required E-PDCCH resource allocation field is shown in Equation 4.
  • Equation 5 the number of bits of the E-PDCCH resource allocation field required is expressed by Equation 5.
  • the mixed DCI including the E-PDCCH resource allocation field may be configured as shown in Table 7.
  • Table 8 is another example of a mixed DCI according to the present invention.
  • Table 8 Component Carrier Indicator: 0 or 3 bits Format 0 / 1A Identification Flag: 1 bit is set to 1 Mixed Resource Allocation Field: Bits are all set to 1, or set to other redundant values Local / Distributed Allocation Flags: 1 bit If all resource allocation fields are set to 1, it is set to 1. Otherwise set to 0 -E-PDCCH resource allocation field: bits TPC command: 2 bits All remaining bits: all set to a specific fixed value (0 or 1)
  • the base station sets the value of the format 0 / 1A identification flag to 1, the mixed resource allocation field to all 1, and the local / distributed allocation flag as shown in Table 4. Is set to 1.
  • the E-PDCCH resource allocation field should be defined.
  • the base station places a constraint on resource scheduling (or allocated band of the E-PDCCH) of the E-PDCCH. For example, the base station may configure the E-PDCCH resource allocation field to indicate the starting point and length of the resource block.
  • the length S may be indicated by a 2-bit TPC command field.
  • the mixed DCI including the E-PDCCH resource allocation field may be configured as shown in Table 8.
  • Table 9 is another example of a mixed DCI according to the present invention.
  • Table 9 Component Carrier Indicator: 0 or 3 bits Format 0 / 1A Identification Flag: 1 bit is set to 1 Mixed Resource Allocation Field: Bits are all set to 1, or set to other redundant values Here, n bits are added to the mixed resource allocation field, and redundant sign points indicate E-PDCCH resource allocation. Local / Distributed Allocation Flags: 1 bit If all resource allocation fields are set to 1, it is set to 1. Otherwise set to 0 MCS field for PDSCH: 5 bits and / or TPC command: 2 bits All remaining bits: all set to a specific fixed value (0 or 1)
  • the mixed resource allocation field not only indicates that the mixed DCI is for scheduling of the E-PDCCH, but also indicates the E-PDCCH resource allocation. For example, n bits are added to the mixed resource allocation field, and redundant code points obtained due to the n additional bits indicate E-PDCCH resource allocation.
  • the redundant sign point is, for example, 1111000 to 1111111.
  • mixed DCI is a structure for efficiently transmitting forward control information to a user equipment Can be In particular, it is possible to overcome the limitation of the PDCCH capacity due to radio resources in a limited control region.
  • FIG. 7 is a flowchart illustrating a method of configuring a control channel by a base station according to another embodiment of the present invention.
  • the base station specifically sets at least one of a HARQ process number field, a new data indicator field, a duplicated version field, and an MCS field to be included in the DCI in order for the DCI to indicate the E-PDCCH (S700).
  • the base station sets the value of the HARQ process number field to a previously transmitted HARQ process number at a time within a retransmission delay. This is a special configuration different from the normal case where the HARQ process number is changed at every DCI transmission.
  • the terminal receives the same HARQ process number within a time within the retransmission delay. Accordingly, the UE may recognize that the DCI indicates the E-PDCCH from a special configuration.
  • the base station sets a new data indicator field to indicate that new data is to be transmitted, but sets a value of the duplicate version field to 3. This is a special combination of new data indicator fields and duplicate version fields. Accordingly, the UE can determine that the DCI is for scheduling of the E-PDCCH, not for general PDSCH control.
  • the base station sets the MCS field to a value that is not defined in the original MCS field (eg, 29 to 31). This is a redundant sign point of the MCS field. That is, if the value of the MCS field is set to a redundant code point, the UE that receives the MCS field may recognize that the corresponding DCI indicates E-PDCCH, rather than delivering PDSCH transmission information.
  • the base station generates a mixed DCI including at least one field specially set (S705), transmits the PDCCH to which the mixed DCI is mapped to the terminal in the control region, and transmits the E-PDCCH to the terminal in the data region.
  • step S710 is performed as follows.
  • the base station adds a CRC for error detection to the mixed DCI (S710), and scrambles a specific RNTI according to the owner or purpose of the PDCCH to the CRC (S715).
  • the base station performs channel coding on the mixed DCI to which the CRC is added to generate coded data (S720), and performs rate matching based on the CCE aggregation unit allocated to the PDCCH format (S725).
  • the base station modulates the encoded data to generate modulation symbols (S730), and maps modulation symbols to physical resource elements (S735).
  • FIG. 8 is a diagram illustrating a mapping relationship between PDCCH, E-PDCCH and PDSCH according to an embodiment of the present invention.
  • one subframe includes a control region 800 and a data region 850.
  • the base station defines one common search space in the control region 800, and a terminal capable of receiving an E-PDCCH may share the one common search space.
  • the base station separately defines a common search space for the PDCCH indicating the E-PDCCH, so that the terminal performs PDCCH monitoring in the common search space for the PDCCH.
  • the base station allocates one or more terminal specific search spaces to each terminal in the control region 800 and transmits the PDCCH 810 to the terminal using a common search space or a terminal specific search space.
  • the base station transmits control information for downlink transmission through DCI format 1A or downlinks using another DCI format used for transmission control in transmission mode. Delivers control information for link transmission.
  • the two DCI formats may be transmitted in the control region 800.
  • DCI format 1A is used for E-PDCCH indication. If the resource of the control region 800 is not sufficient, the base station can reduce the load of the control region 800 by transmitting only DCI format 1A through the control region 800 for the terminal capable of receiving the E-PDCCH.
  • the PDCCH 810 to which the mixed DCI is mapped is transmitted in the control region 800 and indicates only transmission of the E-PDCCH 820, or a transmission region of the E-PDCCH 820, or an E-PDCCH ( Resource allocation of 820, or transmission and resource allocation of the E-PDCCH (820).
  • the E-PDCCH 820 is mapped to the PDSCH 830 and indicates resource allocation and / or transmission control of the PDSCH 830.
  • FIG. 9 is a flowchart illustrating a method of receiving a control channel by a terminal according to an embodiment of the present invention.
  • the terminal receives a PDCCH for itself by performing PDCCH monitoring in a common search space or a terminal specific search space in a control region (S900).
  • the monitoring method of FIG. 3 may be applied to the monitoring of the PDCCH.
  • C-RNTI, P-RNTI, RA-RNTI, SI-RNTI, etc. may be used as an identifier of the UE scrambled in the PDCCH.
  • the UE checks whether the DCI mapped to the PDCCH is a mixed DCI (S905).
  • the procedure for identifying a mixed DCI is as follows.
  • the procedure of confirming the mixed DCI may include a step of the terminal confirming whether the value of the mixed resource allocation field is one of the redundant code points. Accordingly, the UE may check whether the DCI is DCI format 1A or another DCI format used for transmission mode (transmission mode) transmission control or mixed DCI for scheduling of the E-PDCCH.
  • the procedure for identifying the mixed DCI may include the terminal checking whether the format 0 / 1A identification flag included in the DCI is a specific value (for example, 1).
  • the procedure for identifying the mixed DCI may include the terminal checking whether the local / distributed allocation flag included in the DCI is a specific value (for example, 1).
  • the procedure for checking the mixed DCI may include checking whether the UE receives the same HARQ process number as the HARQ process number previously received within a time within a retransmission delay.
  • the terminal receives the same HARQ process number as the HARQ process number previously received within a time within the retransmission delay, it may be recognized that the DCI is a mixed DCI for scheduling of the E-PDCCH.
  • the procedure for confirming the mixed DCI may include a step in which the UE indicates that the new data indicator field indicates that new data is to be transmitted and determines whether the value of the duplicate version field is set to 3.
  • the UE may determine that the DCI is not for general PDSCH control but for scheduling of the E-PDCCH.
  • the procedure for identifying the mixed DCI may include checking, by the UE, whether the MCS field is set to a value (for example, 29 to 31) that is not defined in the original MCS field. If the MCS field is set to a value that is not originally defined in the MCS field (for example, 29 to 31), the UE may recognize that the DCI is a mixed DCI indicating the E-PDCCH, rather than carrying PDSCH transmission information. have.
  • the mixed DCI can be any of Table 4, Tables 6-9, for example.
  • the mixed DCI includes an E-PDCCH resource allocation field.
  • the UE recognizes the location of a specific resource in the data area indicated by the E-PDCCH resource allocation field (S910).
  • E-PDCCH is mapped to the resource of the location.
  • Table 6 when a resource required for transmission of the E-PDCCH is set to a resource of a specific location in the data region by RRC signaling, the UE can find the E-PDCCH from the resource of the specific location. In this case, the UE may perform blind decoding to find the E-PDCCH in the data region.
  • the terminal receives the E-PDCCH mapped to the resource of the specific location (S915).
  • the E-PDCCH may include scheduling information about the PDSCH in the data region.
  • the terminal receives the PDSCH indicated by the E-PDCCH in the data region based on the E-PDCCH resource allocation field in the mixed DCI (S920).
  • FIG. 10 is a block diagram illustrating a terminal and a base station according to an embodiment of the present invention.
  • the terminal 1000 includes a receiver 1005 and a DCI analyzer 1010.
  • the receiver 1005 performs PDCCH monitoring in a common search space or a terminal specific search space in a control region and receives a PDCCH for the terminal 1005.
  • the monitoring method of FIG. 3 may be applied to the monitoring of the PDCCH.
  • the DCI analyzer 1010 checks whether the DCI mapped to the PDCCH is a mixed DCI.
  • the DCI analyzer 1010 checks the mixed DCI as follows. As an example, the DCI analyzer 1010 may check whether the value of the mixed resource allocation field is one of the redundant code points. As a result, the DCI analyzer 1010 may determine whether the DCI is a DCI format 1A or another DCI format used for transmission control in a transmission mode or mixed DCI for scheduling of the E-PDCCH.
  • the DCI analyzer 1010 may check whether the format 0 / 1A identification flag included in the DCI is a specific value (for example, 1). As another example, the DCI analyzer 1010 may check whether a local / distributed allocation flag included in the DCI is a specific value (for example, 1). As another example, the DCI analyzer 1010 may check whether a HARQ process number identical to a previously received HARQ process number is received within a time within a retransmission delay. If the receiver 1005 receives the same HARQ process number as the HARQ process number previously received within a time within the retransmission delay, the DCI analyzer 1010 may recognize that the DCI is a mixed DCI for scheduling of the E-PDCCH. have.
  • the DCI analyzer 1010 may indicate that the new data indicator field indicates that new data is to be transmitted and check whether the value of the duplicate version field is set to 3.
  • the DCI analyzer 1010 may determine that the DCI is for scheduling the E-PDCCH, not for general PDSCH control.
  • the DCI analyzer 1010 may check whether the MCS field is set to a value (for example, 29 to 31) that is not defined in the original MCS field. If the MCS field is set to a value that is not originally defined in the MCS field (for example, 29 to 31), the DCI analyzer 1010 determines that the mixed DCI indicating the E-PDCCH, rather than the DCI carrying PDSCH transmission information. It can be recognized as The mixed DCI can be any of Table 4, Tables 6-9, for example. In addition, the mixed DCI includes an E-PDCCH resource allocation field.
  • the DCI analyzer 1010 recognizes the location of the resource in the data area indicated by the E-PDCCH resource allocation field and informs the receiver 1005 of the location of the resource. Or, as shown in Table 6, when the resource required for transmission of the E-PDCCH is set to a resource of a specific location or region in the data region, the DCI analyzer 1010 may determine the resource of the specific position (or region) as shown in Table 6. E-PDCCH can be found at. In this case, the receiver 1005 may perform blind decoding to find the E-PDCCH in the data region.
  • the receiver 1005 receives the E-PDCCH mapped to the resource of the location from the base station 1050.
  • the E-PDCCH may include scheduling information about the PDSCH in the data region.
  • the receiving unit 1005 receives the PDSCH indicated by the E-PDCCH in the data region based on the E-PDCCH resource allocation field in the mixed DCI.
  • the base station 1050 includes a field configurer 1055, a DCI generator 1060, and a transmitter 1065.
  • the field configuration unit 1055 specifically sets a mixed resource allocation field indicating that the E-PDCCH for the terminal 1000 is scheduled.
  • the field configuration unit 1055 specifically sets the mixed resource allocation field to indicate any one of the redundant code points.
  • the field configuration unit 1055 may set all bits of the mixed resource allocation field to 1 and set the local / distributed allocation flag to 1.
  • the field constructor 1055 configures an E-PDCCH resource allocation field indicating a resource (or resource region) through which the E-PDCCH is transmitted.
  • the field configuration unit 1055 may use bits constituting a modulation and coding scheme field as an E-PDCCH resource allocation field.
  • the field configuration unit 1055 may instead use fields such as HARQ process number, new data indicator, and duplicated version in the DCI as an E-PDCCH resource allocation field.
  • the sum of the bits constituting the MCS field, the HARQ process number field, the new data indicator field, and the duplicate version fields is 11 bits (for FDD system) or 12 bits (for TDD system), so 11-bit or 12-bit E- PDCCH resource allocation field may be defined.
  • the field configuration unit 1055 specifically sets at least one of a HARQ process number field, a new data indicator field, a duplicate version field, and an MCS field to indicate the E-PDCCH.
  • the field configuration unit 1055 may set the value of the HARQ process number field equal to the previously transmitted HARQ process number at a time within the retransmission delay.
  • the field configuration unit 1055 may set a new data indicator field to indicate that new data is to be transmitted, but may set the value of the duplicate version field to three.
  • the field configuration unit 1055 may set the MCS field to a value (for example, 29 to 31) not originally defined in the MCS field.
  • the DCI generation unit 1060 generates a mixed DCI including at least one of a HARQ process number field, a new data indicator field, a duplicate version field, and an MCS field, and a mixed resource allocation field and an E-PDCCH resource allocation field.
  • the mixed DCI generated by the DCI generator 1060 may be any one of Table 4, Tables 6 to 9, and the mixed DCI.
  • the transmitter 1065 maps the PDCCH to which the mixed DCI is mapped to the common search space of the control region in the subframe, transmits the PDCCH to which the mixed DCI is mapped to the terminal 1000 in the control region, and transmits the E-PDCCH.
  • the data is transmitted to the terminal 1000 in the data area in the subframe.
  • the transmitter 1065 adds a CRC for error detection to the mixed DCI, and scrambles a specific RNTI according to the owner or purpose of the PDCCH.
  • the transmitter 1065 performs channel coding on the mixed 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 1065 modulates the encoded data to generate modulation symbols, maps the modulation symbols to physical resource elements, and transmits the modulation symbols to the terminal 1000.
  • 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 dispositif et un procédé de transmission d'un canal de commande dans un système de communication sans fil. La présente invention concerne un procédé de transmission par une station de base d'un canal de commande comprenant les étapes consistant à : régler une valeur d'un champ d'allocation de ressources mixte en tant que point de code résiduel indiquant la transmission d'un canal de commande de liaison descendante physique amélioré (E-PDCCH); créer un champ d'allocation de ressource E-PDCCH indiquant une ressource avec laquelle le canal E-PDCCH est mis en correspondance; générer des informations de commande de liaison descendante contenant le champ d'allocation de ressource mixte et le champ d'allocation de ressource E-PDCCH; transmettre le canal PDCCH devant être mis en correspondance avec un terminal dans une région de commande par le biais des informations de commande de liaison descendante; et transmettre le canal E-PDCCH au terminal dans une région de données. Conformément à la présente invention, celle-ci permet de dépasser la limite de capacité du canal PDCCH due au fait qu'une ressource sans fil se trouve dans une région de commande limitée.
PCT/KR2012/004884 2011-06-30 2012-06-20 Dispositif et procédé de transmission d'un canal de commande dans un système de communication sans fil WO2013002512A2 (fr)

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Cited By (1)

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CN110839291A (zh) * 2018-08-19 2020-02-25 华为技术有限公司 传输下行控制信息的方法和装置

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WO2010053984A2 (fr) * 2008-11-04 2010-05-14 Nortel Networks Limited Établissement de structure de commande de liaison descendante dans une première porteuse pour indiquer une information de commande dans une seconde porteuse différente
WO2010076300A1 (fr) * 2008-12-30 2010-07-08 Telefonaktiebolaget L M Ericsson (Publ) Procédé et appareil permettant une transmission robuste d'informations de commande dans un réseau de communication sans fil
WO2011037439A2 (fr) * 2009-09-28 2011-03-31 Samsung Electronics Co., Ltd. Extension de canaux physiques de commande de liaison descendante
KR20110040672A (ko) * 2009-10-12 2011-04-20 주식회사 팬택 무선통신 시스템에서 제어정보 송수신방법 및 장치

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WO2010053984A2 (fr) * 2008-11-04 2010-05-14 Nortel Networks Limited Établissement de structure de commande de liaison descendante dans une première porteuse pour indiquer une information de commande dans une seconde porteuse différente
WO2010076300A1 (fr) * 2008-12-30 2010-07-08 Telefonaktiebolaget L M Ericsson (Publ) Procédé et appareil permettant une transmission robuste d'informations de commande dans un réseau de communication sans fil
WO2011037439A2 (fr) * 2009-09-28 2011-03-31 Samsung Electronics Co., Ltd. Extension de canaux physiques de commande de liaison descendante
KR20110040672A (ko) * 2009-10-12 2011-04-20 주식회사 팬택 무선통신 시스템에서 제어정보 송수신방법 및 장치

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Publication number Priority date Publication date Assignee Title
CN110839291A (zh) * 2018-08-19 2020-02-25 华为技术有限公司 传输下行控制信息的方法和装置
CN110839291B (zh) * 2018-08-19 2024-02-02 华为技术有限公司 传输下行控制信息的方法和装置

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