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WO2013012151A1 - Procédé et appareil de transmission-réception d'informations de contrôle en liaison descendante au sein d'un système de communication sans fil - Google Patents

Procédé et appareil de transmission-réception d'informations de contrôle en liaison descendante au sein d'un système de communication sans fil Download PDF

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Publication number
WO2013012151A1
WO2013012151A1 PCT/KR2012/001250 KR2012001250W WO2013012151A1 WO 2013012151 A1 WO2013012151 A1 WO 2013012151A1 KR 2012001250 W KR2012001250 W KR 2012001250W WO 2013012151 A1 WO2013012151 A1 WO 2013012151A1
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Prior art keywords
subframe
search space
pdcch
region
css
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English (en)
Korean (ko)
Inventor
최혜영
한승희
이현우
김진민
손혁민
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0076—Distributed coding, e.g. network coding, involving channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals

Definitions

  • the following description relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving downlink control information in a wireless communication system supporting one or more serving cells.
  • Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data.
  • a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA).
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • MCD division multiple access
  • MCDMA multi-carrier frequency division multiple access
  • MC-FDMA multi-carrier frequency division multiple access
  • An object of the present invention is to set an e-PDCCH region and to set a common search space and a cell specific search space in the PDCCH region and the e-PDCCH region.
  • a first technical aspect of the present invention is a method of receiving control information from a terminal in a wireless communication system, comprising: determining a search space consisting of PDCCH candidates on a downlink subframe from a base station; And attempting to decode each of the PDCCH candidates on the determined search space, wherein the search space includes a common search space (CSS) and a terminal specific search space (USS), and the CSS includes the subframe.
  • the search space includes a common search space (CSS) and a terminal specific search space (USS)
  • the CSS includes the subframe.
  • the search space includes a common search space (CSS) and a terminal specific search space (USS)
  • the CSS Is located in the first region of the subframe
  • the USS is located in the second region of the subframe
  • a third technical aspect of the present invention is an apparatus for receiving control information in a wireless communication system, comprising: a receiving module; And a processor, wherein the processor determines a search space consisting of PDCCH candidates on a downlink subframe, and attempts to decode each of the PDCCH candidates on the determined search space, wherein the search space is a common search space ( CSS) and a terminal specific search space (USS), wherein the CSS is located in a first area of the subframe, the USS is located in a second area of the subframe, and the first area is in the subframe.
  • a fourth technical aspect of the present invention is an apparatus for transmitting control information in a wireless communication system, comprising: a transmission module; And a processor, wherein the processor determines a search space consisting of physical downlink control channel (PDCCH) candidates on a downlink subframe, and transmits the control information through one PDCCH among the PDCCH candidates on the search space.
  • a transmission module comprising: a transmission module; And a processor, wherein the processor determines a search space consisting of physical downlink control channel (PDCCH) candidates on a downlink subframe, and transmits the control information through one PDCCH among the PDCCH candidates on the search space.
  • PDCCH physical downlink control channel
  • the search space includes a common search space (CSS) and a terminal specific search space (USS), wherein the CSS is located in a first region of the subframe, and the USS is a second region of the subframe
  • the second region consists of OFDM symbols except for the first region in the subframe.
  • the USS may be located on one or more subcarriers on at least one or more OFDM symbols of the second region.
  • the USS may be located in the first slot in the subframe.
  • the CSS may be located on the primary cell.
  • control information received on the CSS may be one of a random access identifier (RA-RNTI), a system information identifier (SI-RNTI) or a paging identifier (P-RNTI).
  • RA-RNTI random access identifier
  • SI-RNTI system information identifier
  • P-RNTI paging identifier
  • a signal-to-noise ratio of control information transmitted to a common search space and / or a terminal specific search space can be increased.
  • the UE-specific search space can be flexibly set.
  • 1 is a diagram illustrating a structure of a radio frame used in a 3GPP LTE system.
  • FIG. 2 is a diagram illustrating a resource grid in a downlink slot.
  • 3 is a diagram illustrating a structure of an uplink subframe.
  • FIG. 4 is a diagram illustrating a structure of a downlink subframe.
  • FIG. 5 is a diagram illustrating a terminal specific search space at each aggregation level.
  • 6 is a diagram for explaining carrier aggregation.
  • FIG. 7 is a diagram for describing cross carrier scheduling.
  • 8 and 9 are diagrams for describing a method that can be used when exchanging scheduling information between respective base stations.
  • 10 and 11 are diagrams illustrating time-frequency resources allocated for an e-PDCCH.
  • FIGS. 12 to 17 are diagrams illustrating an example in which a common search space and a terminal specific search space are set in a PDCCH and / or an e-PDCCH.
  • FIG. 18 is a view showing a process in the case described in FIG. 15.
  • FIG. 19 is a diagram illustrating a configuration of an embodiment of a base station apparatus or a terminal apparatus according to the present invention.
  • each component or feature may be considered to be optional unless otherwise stated.
  • Each component or feature may be embodied in a form that is not combined with other components or features.
  • some components and / or features may be combined to form an embodiment of the present invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.
  • the base station has a meaning as a terminal node of the network that directly communicates with the terminal.
  • the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.
  • a 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point (AP), and the like.
  • the term base station may be used as a concept including a cell or a sector.
  • the repeater may be replaced by terms such as Relay Node (RN), Relay Station (RS).
  • RN Relay Node
  • RS Relay Station
  • terminal may be replaced with terms such as user equipment (UE), mobile station (MS), mobile subscriber station (MSS), and subscriber station (SS).
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE and LTE-Advanced (LTE-A) system and 3GPP2 system. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
  • LTE-A Advanced
  • WiMAX can be described by the IEEE 802.16e standard (WirelessMAN-OFDMA Reference System) and the advanced IEEE 802.16m standard (WirelessMAN-OFDMA Advanced system). For clarity, the following description focuses on 3GPP LTE and 3GPP LTE-A systems, but the technical spirit of the present invention is not limited thereto.
  • 1 (a) is a diagram showing the structure of a radio frame used in the 3GPP LTE system.
  • One radio frame includes 10 subframes, and one subframe includes two slots in the time domain.
  • the time for transmitting one subframe is defined as a transmission time interval (TTI).
  • TTI transmission time interval
  • one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
  • One slot may include a plurality of OFDM symbols in the time domain. Since the 3GPP LTE system uses the OFDMA scheme in downlink, the OFDM symbol represents one symbol length.
  • One symbol may be referred to as an SC-FDMA symbol or a symbol length in uplink.
  • a resource block (RB) is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.
  • the structure of such a radio frame is merely exemplary. Accordingly, the number of subframes included in one radio frame, the number of slots included in one subframe, or the number of OFDM symbols included in one slot may be changed in various ways.
  • Figure 1 (b) illustrates the structure of a type 2 radio frame.
  • Type 2 radio frames consist of two half frames. Each half frame consists of five subframes, a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP), and an Uplink Pilot Time Slot (UpPTS), of which one subframe consists of two slots.
  • DwPTS is used for initial cell search, synchronization or channel estimation at the terminal.
  • UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
  • the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • the structure of the radio frame is merely an example, and the number of subframes included in the radio frame or the number of slots included in the subframe and the number of symbols included in the slot may be variously changed.
  • FIG. 2 is a diagram illustrating a resource grid in a downlink slot.
  • One downlink slot includes seven OFDM symbols in the time domain and one resource block (RB) is shown to include 12 subcarriers in the frequency domain, but the present invention is not limited thereto.
  • one slot includes 7 OFDM symbols in the case of a general cyclic prefix (CP), but one slot may include 6 OFDM symbols in the case of an extended-CP (CP).
  • Each element on the resource grid is called a resource element (RE).
  • One resource block includes 12 x 7 resource elements.
  • the number of NDLs of resource blocks included in a downlink slot depends on a downlink transmission bandwidth.
  • the structure of the uplink slot may be the same as the structure of the downlink slot.
  • the uplink subframe may be divided into a control region and a data region in the frequency domain.
  • a physical uplink control channel (PUCCH) including uplink control information is allocated to the control region.
  • a physical uplink shared channel (PUSCH) including user data is allocated.
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • one UE does not simultaneously transmit a PUCCH and a PUSCH.
  • PUCCH for one UE is allocated to an RB pair in a subframe. Resource blocks belonging to a resource block pair occupy different subcarriers for two slots. This is called a resource block pair allocated to the PUCCH is frequency-hopped at the slot boundary.
  • the downlink control channels used in the 3GPP LTE system include, for example, a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical HARQ indicator channel. (Physical Hybrid automatic repeat request Indicator Channel, PHICH).
  • PCFICH physical control format indicator channel
  • PDCCH physical downlink control channel
  • PHICH Physical HARQ indicator channel
  • the PCFICH is transmitted in the first OFDM symbol of a subframe and includes information on the number of OFDM symbols used for control channel transmission in the subframe.
  • the PHICH includes a HARQ ACK / NACK signal as a response of uplink transmission.
  • the PDCCH includes uplink or downlink scheduling information and power control information.
  • DCI downlink control information
  • DCI includes uplink or downlink scheduling information or an uplink transmit power control command for a certain terminal group.
  • the PDCCH is a resource allocation and transmission format of the downlink shared channel (DL-SCH), resource allocation information of the uplink shared channel (UL-SCH), paging information of the paging channel (PCH), system information on the DL-SCH, on the PDSCH Resource allocation of upper layer control messages such as random access responses transmitted to the network, a set of transmit power control commands for individual terminals in an arbitrary terminal group, transmission power control information, and activation of voice over IP (VoIP) And the like.
  • DL-SCH downlink shared channel
  • UL-SCH resource allocation information of the uplink shared channel
  • PCH paging information of the paging channel
  • system information on the DL-SCH on the PDSCH
  • Resource allocation of upper layer control messages such as random access responses transmitted to the network, a set of transmit power control commands for individual terminals in an arbitrary terminal group, transmission power control information,
  • DCI formats 0, 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, 3, 3A, and 4 are defined.
  • DCI formats 0, 1A, 3, and 3A are defined to have the same message size in order to reduce the number of blind decoding, which will be described later.
  • These DCI formats are i) DCI formats 0, 4, ii) DCI formats 1, 1A, 1B, 1C, 1D, 2, used for downlink scheduling assignment depending on the purpose of the control information to be transmitted. 2A, 2B, 2C, and iii) DCI formats 3 and 3A for power control commands.
  • DCI format 0 used for uplink scheduling grant a carrier indicator necessary for carrier aggregation to be described later, a flag used for distinguishing DCI formats 0 and 1A (flag for format 0 / format 1A differentiation), A frequency hopping flag indicating whether frequency hopping is used in uplink PUSCH transmission, information on resource block assignment, modulation and coding scheme to be used for PUSCH transmission, and a modulation and coding scheme.
  • DMRS demodulation reference signal
  • CSI request request information
  • DCI format 0 uses synchronous HARQ, it does not include a redundancy version like DCI formats related to downlink scheduling allocation.
  • the carrier indicator when cross carrier scheduling is not used, it is not included in the DCI format.
  • DCI format 4 is new in LTE-A Release 10 and is intended to support spatial multiplexing for uplink transmission in LTE-A.
  • the DCI format 4 further includes information for spatial multiplexing as compared to the DCI format 0, and thus has a larger message size, and further includes additional control information in the control information included in the DCI format 0. That is, the DCI format 4 further includes a modulation and coding scheme for the second transport block, precoding information for multi-antenna transmission, and sounding reference signal request (SRS request) information.
  • SRS request sounding reference signal request
  • DCI formats 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, and 2C related to downlink scheduling allocation do not significantly support spatial multiplexing, but 1, 1A, 1B, 1C, 1D and 2, which support spatial multiplexing, It can be divided into 2A, 2B, and 2C.
  • DCI format 1C supports only frequency continuous allocation as a compact downlink allocation and does not include a carrier indicator and a redundant version as compared to other formats.
  • DCI format 1A is a format for downlink scheduling and random access procedures. This includes the carrier indicator, an indicator indicating whether downlink distributed transmission is used, PDSCH resource allocation information, modulation and coding scheme, redundancy version, HARQ processor number to inform the processor used for soft combining, HARQ
  • a new data indicator used to empty the buffer for initial transmission, a transmit power control command for the PUCCH, and an uplink index required for the TDD operation may be included.
  • DCI format 1 In the case of DCI format 1, most of the control information is similar to DCI format 1A. However, compared to DCI format 1A related to continuous resource allocation, DCI format 1 supports non-contiguous resource allocation. Therefore, DCI format 1 further includes a resource allocation header, so that control signaling overhead is somewhat increased as a trade-off of increasing flexibility of resource allocation.
  • DCI formats 1B and 1D are common in that precoding information is further included as compared with DCI format 1.
  • DCI format 1B includes PMI verification and DCI format 1D includes downlink power offset information.
  • the control information included in the DCI formats 1B and 1D is mostly identical to that of the DCI format 1A.
  • the DCI formats 2, 2A, 2B, and 2C basically include most of the control information included in the DCI format 1A, and further include information for spatial multiplexing. This includes the modulation and coding scheme, the new data indicator and the redundancy version for the second transport block.
  • DCI format 2 supports closed-loop spatial multiplexing, while 2A supports open-loop spatial multiplexing. Both contain precoding information.
  • DCI format 2B supports dual layer spatial multiplexing combined with beamforming and further includes cyclic shift information for DMRS.
  • DCI format 2C can be understood as an extension of DCI format 2B and supports public multiplexing up to eight layers.
  • DCI formats 3 and 3A may be used to supplement transmission power control information included in DCI formats for uplink scheduling grant and downlink scheduling assignment, that is, to support semi-persistent scheduling. .
  • DCI format 3 1 bit per terminal and 2 bit in 3A are used.
  • Any one of the above-described DCI formats may be transmitted through one PDCCH, and a plurality of PDCCHs may be transmitted in a control region.
  • a Cyclic Redundancy Check (CRC) is attached to the DCI, and in this process, a radio network temporary identifier (RNTI) is masked.
  • the RNTI may use different RNTIs according to the purpose of transmitting the DCI.
  • the P-RNTI is used for a paging message related to network initiated connection establishment
  • the RA-RNTI is used for random access
  • the SI-RNTI is used for a system information block (SIB). Can be.
  • SIB system information block
  • C-RNTI which is a unique terminal identifier, may be used.
  • DCI with CRC is coded with a predetermined code and then adjusted to the amount of resources used for transmission through rate-matching.
  • a control channel element which is a continuous logical allocation unit
  • the CCE is composed of 36 REs, which corresponds to 9 units in a resource element group (REG).
  • the number of CCEs required for a specific PDCCH depends on the DCI payload, cell bandwidth, channel coding rate, etc., which are the size of control information. In more detail, the number of CCEs for a specific PDCCH may be defined according to the PDCCH format as shown in Table 1 below.
  • the transmitter may use the PDCCH format 0 and then adaptively use the PDCCH format by changing the PDCCH format to 2 when the channel condition worsens. have.
  • any one of four formats may be used for the PDCCH, which is not known to the UE. Therefore, the UE needs to decode without knowing the PDCCH format, which is called blind decoding. However, since it is a heavy burden for the UE to decode all possible CCEs used for downlink for each PDCCH format, a search space is defined in consideration of the scheduler limitation and the number of decoding attempts.
  • the search space is a set of candidate PDCCHs consisting of CCEs that the UE should attempt to decode on an aggregation level.
  • the aggregation level and the number of PDCCH candidates may be defined as shown in Table 2 below.
  • the terminal since four aggregation levels exist, the terminal has a plurality of search spaces according to each aggregation level.
  • the search space may be divided into a terminal specific search space and a common search space.
  • the UE specific search space (USS) is for specific UEs, and each UE monitors the UE specific search space (attempting to decode a PDCCH candidate set according to a possible DCI format) and is masked on the PDCCH.
  • the RNTI and CRC may be checked to obtain control information if valid.
  • the common search space is for a case where a plurality of terminals or all terminals need to receive a PDCCH such as dynamic scheduling or paging message for system information.
  • a PDCCH such as dynamic scheduling or paging message for system information.
  • CSS may be used for a specific terminal for resource management.
  • CSS may overlap with a terminal specific search space.
  • the control information for the plurality of terminals may be masked by any one of a random access identifier (RA-RNTI), a system information identifier (SI-RNTI), or a paging identifier (P-RNTI).
  • the search space may be specifically determined by Equation 1 below.
  • Is the aggregation level Is a variable determined by RNTI and subframe number k, Is the number of PDCCH candidates when carrier aggregation is applied If not, as And Is the number of PDCCH candidates, Is the total number of CCEs of the control region in the kth subframe, Is a factor that specifies an individual CCE in each PDCCH candidate in the PDCCH. to be. For common navigation space Is always determined to be zero.
  • 5 shows a terminal specific search space (shading part) at each aggregation level that can be defined according to Equation (1).
  • Carrier merge is not used here. Is illustrated as 32 for convenience of explanation.
  • FIG. 5 illustrates the case of aggregation levels 1, 2, 4, and 8, respectively, and numbers represent CCE numbers.
  • the start CCE of the search space at each aggregation level is determined by the RNTI and the subframe number k, as described above. Can be determined differently for each set level. Is always determined as a multiple of the aggregation level. In the description below, Is assumed to be CCE number 18 by way of example.
  • the UE attempts decoding sequentially in units of CCEs determined according to a corresponding aggregation level. For example, in (b) of FIG. 5, the UE attempts to decode the two CCE units according to the aggregation level from the CCE number 4 which is the starting CCE.
  • the UE attempts to decode the search space, and the number of decoding attempts is determined by a transmission mode determined through DCI format and RRC signaling.
  • the UE should consider two DCI sizes (DCI format 0 / 1A / 3 / 3A and DCI format 1C) for each of six PDCCH candidates for a common search space. Decryption attempt is necessary.
  • a cell may be understood as a combination of downlink resources and uplink resources.
  • the uplink resource is not an essential element, and thus, the cell may be composed of only the downlink resource or the downlink resource and the uplink resource.
  • the downlink resource may be referred to as a downlink component carrier (DL CC) and the uplink resource may be referred to as an uplink component carrier (UL CC).
  • the DL CC and the UL CC may be represented by a carrier frequency, and the carrier frequency means a center frequency in a corresponding cell.
  • a cell may be classified into a primary cell (PCell) operating at a primary frequency and a secondary cell (SCell) operating at a secondary frequency.
  • PCell and SCell may be collectively referred to as a serving cell.
  • the terminal may perform an initial connection establishment (initial connection establishment) process, or the cell indicated in the connection reset process or handover process may be a PCell. That is, the PCell may be understood as a cell that is the center of control in a carrier aggregation environment to be described later.
  • the UE may receive and transmit a PUCCH in its PCell.
  • the SCell is configurable after the RRC connection establishment is made and can be used to provide additional radio resources.
  • the remaining serving cells except the PCell may be viewed as SCells.
  • the UE In the RRC_CONNECTED state, but the UE is not configured carrier aggregation or does not support carrier aggregation, there is only one serving cell consisting of a PCell.
  • the network may configure one or more SCells in addition to the PCell initially configured in the connection establishment process.
  • Carrier aggregation is a technology introduced in LTE-A to use a wider frequency band to meet the increasing demand for high data rates.
  • Carrier aggregation may be defined as an aggregation of two or more component carriers (CCs) having different carrier frequencies.
  • FIG. 6 (a) shows a subframe when one CC is used in the existing LTE system
  • FIG. 6 (b) shows a subframe when carrier aggregation is used.
  • FIG. 6B three CCs of 20 MHz are used to support a total bandwidth of 60 MHz.
  • each CC may be continuous or may be non-continuous.
  • the terminal may simultaneously receive and monitor downlink data through a plurality of DL CCs.
  • the linkage between each DL CC and UL CC may be indicated by system information.
  • the DL CC / UL CC link may be fixed in the system or configured semi-statically.
  • the frequency band that a specific UE can monitor / receive may be limited to M ( ⁇ N) CCs.
  • Various parameters for carrier aggregation may be set in a cell-specific, UE group-specific or UE-specific manner.
  • Cross-carrier scheduling means, for example, including all downlink scheduling allocation information of another DL CC in a control region of one DL CC among a plurality of serving cells, or a DL CC of any one of a plurality of serving cells. This means that the uplink scheduling grant information for the plurality of UL CCs linked with the DL CC is included in the control region of the UE.
  • 7 is a diagram illustrating a case where cross carrier scheduling is applied. As a premise of description, a carrier indicator field (CIF) will be described first, and FIG. 7 will be described.
  • CIF carrier indicator field
  • the CIF may be included or not included in the DCI format transmitted through the PDCCH, and when included, it indicates that the cross carrier scheduling is applied.
  • cross carrier scheduling is not applied, downlink scheduling allocation information is valid on a DL CC through which current downlink scheduling allocation information is transmitted.
  • the uplink scheduling grant is also valid for one UL CC linked with the DL CC through which the downlink scheduling assignment information is transmitted.
  • the CIF indicates a CC related to downlink scheduling allocation information transmitted through a PDCCH in one DL CC.
  • downlink allocation information about DL CC B and DL CC C that is, information about PDSCH resources, is transmitted through a PDCCH in a control region on DL CC A.
  • the UE monitors the DL CC A to know the CC corresponding to the resource region of the PDSCH through the CIF.
  • control information included in the above-described DCI formats has been described mainly for transmission through a PDCCH defined in LTE / LTE-A
  • the downlink control channel other than the PDCCH for example, e-PDCCH (enhanced PDCCH) Application
  • e-PDCCH enhanced PDCCH
  • the background of the introduction is as follows.
  • a cell causing interference interferes with a specific subframe (s) of an Almost blank subframe (ABS) (eg, a basic downlink signal (eg, a cell-specific reference signal)).
  • ABS Almost blank subframe
  • Subframes in which only transmission of 0 or very weak power is performed thereby reducing interference with neighboring cells or using the inter-base station scheduling information to each cell allocated to the terminal at the cell edge. It may be set to orthogonal the frequency domain of.
  • the control channel (PDCCH, PCFICH, PHICH) may need to be transmitted in all subframes, there is a problem that it is difficult to avoid interference because it is allocated and transmitted in the entire downlink bandwidth.
  • FIG. 8 is a technique that can be used when exchanging scheduling information between base stations, and shows a technique of allocating PDSCH in orthogonal frequency domains to terminals at a cell edge to mitigate interference.
  • the PDCCH has a problem that the interference cannot be mitigated due to the transmission of the entire downlink bandwidth. For example, since the time-frequency region in which the PDCCH is transmitted from eNB1 to UE1 and the time-frequency region in which the PDCCH is transmitted from eNB2 to UE2 overlap, the PDCCH transmissions for each of UE1 and UE2 interfere with each other. Give and receive.
  • the PUCCH or the PUSCH transmitted by the UE1 may act as an interference to the PDCCH or the PDSCH that the adjacent UE2 should receive.
  • interference on the PDSCH can be avoided by allocating terminals to the orthogonal frequency domain, but the PDCCH is affected by the interference by the PUCCH or the PUSCH transmitted by the UE1.
  • the introduction of an e-PDCCH different from the current PDCCH has been discussed.
  • the e-PDCCH has not only interference, but also has the purpose of effectively supporting CoMP (Coordinated Multipoint Transmission) and MU-MIMO (Multiuser-Multi input Multi Output).
  • CoMP Coordinatd Multipoint Transmission
  • MU-MIMO Multiuser-Multi input Multi Output
  • the time-frequency resource for the e-PDCCH is in the subframe indicated by the time-frequency resource region (eg, indicated by PCIFCH) for the PDCCH in the existing LTE / LTE-A system as in FIG. 10 (a).
  • the first slot may be allocated to a time-frequency resource region excluding up to four OFDM symbols from the beginning). That is, the PDCCH and the e-PDCCH may be distinguished on the time axis. In this case, when two or more OFDM symbols for the e-PDCCH are formed, the OFDM symbols may be continuous or discontinuous.
  • time-frequency resources for the e-PDCCH may be allocated in a frequency division multiplexing (FDM) scheme. That is, different e-PDCCHs may be distinguished on the frequency axis. For example, the e-PDCCH may be allocated to a predetermined number of subcarriers for the entire OFDM symbol except for the resource region for the PDCCH in the subframe.
  • FDM frequency division multiplexing
  • FIG. 10 (c) shows that time-frequency resources for the e-PDCCH are allocated in a time division multiplexing (TDM) scheme.
  • TDM time division multiplexing
  • the time-frequency resource region for the PDCCH shown in FIGS. 10B and 10C may be allocated only on one slot as shown in FIG. 11. That is, referring to FIG. 11 (a), a time-frequency resource region (eg, indicated by PCIFCH) for a PDCCH in an existing LTE / LTE-A system in a first slot of a subframe is indicated by a first in a subframe.
  • E-PDCCH may be allocated to the time-frequency resource region excluding the maximum 4 OFDM symbols from the first slot in the first slot by the FDM scheme.
  • the e-PDCCH may be allocated in the TDM scheme on the remaining time-frequency resource region of the first slot except for the time-frequency resource region for the PDCCH.
  • the e-PDCCH region illustrated in FIGS. 10 and 11 is exemplary and may be determined in various ways such as allocating by a combination of TDM and FDM.
  • the region to which the e-PDCCH is allocated may be set to a region that is distinguished from the existing PDCCH and / or another e-PDCCH from one or more time resources or frequency resources.
  • the e-PDCCH region illustrated in FIGS. 10 and 11 may be notified to the UE in various ways as follows. i) by radio resource control (RRC) signaling or configuration, ii) when the use of the e-PDCCH is configured by RRC signaling or configuration, the specific format of the PDCCH predetermined by RRC signaling or configuration or Iii) If the use of the e-PDCCH is configured by RRC signaling or configuration, the resource region of the e-PDCCH can be known through a specific field of PHICH or PCFICH.
  • RRC radio resource control
  • the control region (first region) and the non-first data region (second region), which are up to four OFDM symbols indicated by the PCFICH on a subframe CSS and Describes the various ways in which the USS is defined.
  • CSS and / or USS is configured in the second region, all or part of the above-described e-PDCCH region may be used.
  • the DCI formats used in the CSS and the USS may be used as they are in the above-described LTE / LTE-A system, or may be appropriately modified as necessary.
  • the e-PDCCH region will be described with reference to the one illustrated in FIG. 10 (b) for convenience of description, but the conventional e-PDCCH region shown in FIGS. Note that this may be an area that knowledgeable ones can easily derive.
  • FIG. 12 is a diagram illustrating that CSS and USS are set in a second region.
  • FIG. 12A illustrates a case where cross carrier scheduling is not applied and
  • FIG. 12B illustrates cross carrier scheduling applied.
  • a terminal configured to use e-PDCCH by RRC signaling or configuration may perform monitoring for CSS and USS only in the e-PDCCH region without monitoring the PDCCH.
  • the UE may attempt blind decoding on four PDCCH candidates of aggregation level 4 and two PDCCH candidates of aggregation level 8 with respect to CSS on the e-PDCCH.
  • the UE may attempt blind decoding on the number of PDCCH candidates 6, 6, 2, and 2 corresponding to each of aggregation levels 1, 2, 4, and 8 in the USS of the e-PDCCH. Since both CSS and USS are set in the e-PDCCH region, CSS and USS may overlap each other. That is, in the case of FIG. 12 (a), the discussion about blind decoding in the existing LTE / LTE-A may be applied as it is except that the PDCCH region is changed to the e-PDCCH region.
  • each e-PDCCH region 1201-1203 represents a specific terminal or a group of terminals. It may be for.
  • the e-PDCCH is multiplexed in frequency with respect to a specific UE or a set of UEs.
  • the first e-PDCCH 1201 is a UE e (or UE group A) and a second e-PDCCH. 1202 may be assigned to UE B (or UE group B), and the third e-PDCCH 1203 may be allocated to UE C (or UE group C).
  • the UE A may monitor the CSS and USS in the first e-PDCCH 1201. In this case, however, the terminal A (or terminal group A) cannot monitor other than the first e-PDCCH region 1201 (the terminal A (or terminal group A) is the second and third e-PDCCH (1202, 1203) ) Region is an e-PDCCH region), the DCI common to the UE A (or UE group A) and the UE B (or UE group B) is the CSS of the first e-PDCCH 1201 region and the base station. There is a need to send duplicated CSS in the second e-PDCCH 1202 region. For example, this may be the case of system information (SI).
  • SI system information
  • the main parts of the SI that are not transmitted over the broadcast channel are transmitted over the DL-SCH indicated by the PDCCH masked with the SI-RNTI, which is the SI A (or UE group A) and the UE B. (Or UE group B), the base station needs to transmit in both the CSS of the first e-PDCCH region 1201 and the CSS of the second e-PDCCH region 1202.
  • cross carrier scheduling is applied.
  • the e-PDCCH is transmitted on the DL CC0 which is the primary cell, and the PDSCH indicated by the first e-PDCCH is present in the DL CC0 and the PDSCH indicated by the second e-PDCCH is present in the DL CC1.
  • the DCI transmitted on the e-PDCCH contains uplink grant information of formats 0 and 4
  • the PUSCH indicated by the first e-PDCCH is the UL CC0 linked to the DL CC0 and the PUSCH indicated by the second e-PDCCH. May be UL CCx (x is indicated by CIF) (not shown).
  • the CSS is a search space that is not multiplexed with respect to a specific terminal or a set of terminals
  • each USS may be a search space that is multiplexed with respect to a specific terminal or a set of terminals.
  • the UEs in the cell decode some regions 1311 to 1313 as CSS in the e-PDCCH regions 1301 + 1311, 1302 + 1312, and 1303 + 1313 for each UE, and the e-PDCCH regions allocated only to them. Is decoded for a portion of (e.g., 1301).
  • FIG. 13 (b) shows that cross-carrier scheduling is applied in the case of FIG. 13 (a), indicating that the PDSCH resource of the DL CC1 is indicated by the CFI of the DCI transmitted on the e-PDCCH on the primary cell DL CC0. Can be.
  • the CSS is common to each UE, so that signaling overhead can be reduced because the DCI for CSS is not duplicated. have.
  • FIG. 14 illustrates another example in which the CSS 1411 and the USS 1401-1403 are set separately in the second region.
  • the terminal A performs blind decoding on the CSS set in the e-PDCCH 1411 region, and the e-PDCCH 1401 allocated to itself by RRC signaling or configuration. It is possible to perform blind decoding on the USS in the region. In this case, the terminal A does not perform blind decoding on the first region.
  • FIG. 14 (b) shows that cross carrier scheduling is applied to FIG. 14 (a). In the case of FIG. 14, even though each e-PDCCH 1401-1403 is allocated to each UE, since the CSS 1411 is common to each UE, the overhead of signaling DCI for CSS is not necessary. Can be reduced.
  • each of the e-PDCCHs 1501-1503 is set to USS for different terminals, and a part of the first region 1511 is set to CSS for a plurality of terminals. Can be.
  • e-PDCCH the effect due to the introduction of e-PDCCH can be reduced.
  • a random access response is masked with the RA-RNTI (CRC scrambling) is transmitted from the base station, which is sent to the CSS.
  • the e-PDCCH since the UE attempting initial access to the network has not been assigned a C-RNTI, the USS may not exist because the UE-specific RRC configuration cannot be received.
  • C-RNTI and USS exist, when performing a non-contention based PRACH that does not require contention for synchronization update, scheduling request, reconfiguration, etc.
  • the UE may transmit a masked random access response in RA-RNTI without knowing which terminal the received random access preamble is.
  • a signal is preferably transmitted via CSS.
  • reconfiguration ambiguity is applied by applying the same CSS in an ambiguity interval that may occur at various resets (e.g., activation (or true) and release (or false) of the e-PDCCH). It is possible to prevent).
  • FIG. 15 (b) illustrates that cross carrier scheduling is applied in the case of FIG. 15 (a), and in each case of FIG. 15, there is an advantage in that the DCI for the CSS in FIG. 13 does not need to be repeatedly transmitted.
  • FIG. 16 shows that a USS is set in a first region and CSS is set in a second region in a subframe.
  • the UE may perform blind decoding on CSS on the e-PDCCH and blind decoding on USS in the first region.
  • FIG. 16 (b) shows that cross carrier scheduling is applied in the case of FIG. 16 (a). That is, the UE which decodes the USS in the PDCCH region of the primary cell DL CC0 may know the PDSCH of the DL CC0 and the PDSCH on the DL CC1 through the CIF.
  • FIG. 17 illustrates that only USS is set in the second region.
  • FIG. 17A illustrates a case where cross carrier scheduling is not applied and
  • FIG. 17B illustrates a case where cross carrier scheduling is applied.
  • the USS is multiplexed in an e-PDCCH region for each UE, and CSS is not defined. Therefore, in this example, all DCI formats (eg, DCI format 1A masked with RA-RNTI, SI-RNTI, P-RNTI, etc.) transmitted in CSS in the existing LTE / LTE-A system are transmitted to USS.
  • DCI formats eg, DCI format 1A masked with RA-RNTI, SI-RNTI, P-RNTI, etc.
  • the CSS or USS set in the e-PDCCH region of the second region may increase the received signal-to-noise ratio (SNR) compared to using the PDCCH of the first region in the existing LTE / LTE-A system.
  • SNR received signal-to-noise ratio
  • the e-PDCCH may be transmitted like a PDSCH
  • beamforming may be performed using a cell-specific reference signal (CRS) or a terminal-specific reference signal (DMRS), which may improve SNR.
  • CRS cell-specific reference signal
  • DMRS terminal-specific reference signal
  • Beamforming may be applied to DCI transmitted to the USS as in the case of PDSCH. It is possible to ensure more reliable reception than the DCI transmitted to the.
  • the USS is set in the e-PDCCH region in the second region.
  • the existing LTE / LTE- in which the control region is limited to 1 to 4 OFDM symbols in a subframe.
  • FIG. 18 is a view showing a process in the case described in FIG. 15.
  • the control information may be processed in the process of CRC addition (S1811, S1821), coding with convolutional code (S1812, S1822), rate matching (S1813, S1823), and CCE mapping (S1814, S1824).
  • the CSS is located on the first area and the USS is located on the second area as shown in FIG. 15
  • the control information is masked by any one of RA-RNTI, SI-RNTI, P-RNTI, and the like (S1811).
  • SI-RNTI SI-RNTI
  • P-RNTI P-RNTI
  • FIG. 19 is a diagram illustrating the configuration of a base station apparatus and a terminal apparatus according to the present invention.
  • the base station apparatus 1910 may include a receiving module 1911, a transmitting module 1912, a processor 1913, a memory 1914, and a plurality of antennas 1915.
  • the plurality of antennas 1915 means a base station apparatus supporting MIMO transmission and reception.
  • the receiving module 1911 may receive various signals, data, and information on uplink from the terminal.
  • the transmission module 1912 may transmit various signals, data, and information on a downlink to the terminal.
  • the processor 1913 may control the overall operation of the base station apparatus 1910.
  • the base station apparatus 1910 may be configured to transmit control information for uplink multi-antenna transmission.
  • the processor 1913 of the base station apparatus 1910 performs a function of processing information received by the base station apparatus 1910, information to be transmitted to the outside, and the memory 1914 stores arithmetic processing information for a predetermined time. And may be replaced by a component such as a buffer (not shown).
  • the terminal device 1920 may include a reception module 1921, a transmission module 1922, a processor 1913, a memory 1924, and a plurality of antennas 1925.
  • the plurality of antennas 1925 refers to a terminal device that supports MIMO transmission and reception.
  • the receiving module 1921 may receive various signals, data, and information on a downlink from the base station.
  • the transmission module 1922 may transmit various signals, data, and information on the uplink to the base station.
  • the processor 1923 may control operations of the entire terminal device 1920.
  • the terminal device 1920 may be configured to perform uplink multi-antenna transmission.
  • the processor 1923 of the terminal device may be configured to receive the PDCCH through the receiving module 1921.
  • the processor 1913 determines a search space consisting of physical downlink control channel (PDCCH) candidates on a downlink subframe, and transmits the control information through any one PDCCH among the PDCCH candidates in the search space.
  • the search space includes a common search space (CSS) and a terminal specific search space (USS), wherein the CSS is located in a first area of the subframe, and the USS is located in a second area of the subframe.
  • the second region may consist of OFDM symbols except for the first region in the subframe.
  • the processor 1923 of the terminal device 1920 performs a function of processing the information received by the terminal device 1920, information to be transmitted to the outside, and the memory 1924 for a predetermined time. And may be replaced by a component such as a buffer (not shown).
  • the description of the base station apparatus 1910 may be equally applicable to a relay apparatus as a downlink transmitting entity or an uplink receiving entity, and the description of the terminal device 1920 may include downlink reception. The same may be applied to the relay apparatus as a subject or an uplink transmission subject.
  • Embodiments of the present invention described above may be implemented through various means.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
  • a method according to embodiments of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), and Programmable Logic Devices (PLDs). It may be implemented by field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above.
  • the software code may be stored in a memory unit and driven by a processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • Embodiments of the present invention as described above may be applied to various mobile communication systems.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un système de communication sans fil. De manière plus spécifique, elle concerne une méthode de réception des informations de contrôle par un terminal au sein d'un système de communication sans fil. Ce procédé comprend les étapes suivantes : définition d'un espace de recherche se composant de candidats PDCCH dans une sous-trame de liaison descendante à partir d'une station de base ; et tentative de codage de chaque candidat PDCCH dans l'espace de recherche défini. Cet espace de recherche comprend un espace de recherche commun (CSS) et un espace de recherche spécifique au terminal (USS). Le CSS est situé dans une première région de la sous-trame, et l'USS dans une seconde région de celle-ci. La première région se compose d'un premier numéro N (N <= 4) de symboles OFDM dans la sous-trame, et la seconde région de symboles OFDM différents de ceux de la première région.
PCT/KR2012/001250 2011-07-19 2012-02-20 Procédé et appareil de transmission-réception d'informations de contrôle en liaison descendante au sein d'un système de communication sans fil Ceased WO2013012151A1 (fr)

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WO2015072687A3 (fr) * 2013-11-14 2015-06-18 주식회사 케이티 Procédé et appareil de transmission/réception d'informations de commande
CN111405665A (zh) * 2013-12-11 2020-07-10 北京三星通信技术研究有限公司 物理下行控制信道的资源分配方法和装置
CN111405665B (zh) * 2013-12-11 2023-12-12 北京三星通信技术研究有限公司 物理下行控制信道的资源分配方法和装置
WO2017175938A1 (fr) * 2016-04-07 2017-10-12 엘지전자 주식회사 Procédé destiné à la transmission de liaison descendante cyclique cellulaire dans un système de communication sans fil et appareil associé
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