WO2012039102A1 - Station de base, terminal, procédé d'émission et procédé de réception - Google Patents

Station de base, terminal, procédé d'émission et procédé de réception Download PDF

Info

Publication number
WO2012039102A1
WO2012039102A1 PCT/JP2011/005015 JP2011005015W WO2012039102A1 WO 2012039102 A1 WO2012039102 A1 WO 2012039102A1 JP 2011005015 W JP2011005015 W JP 2011005015W WO 2012039102 A1 WO2012039102 A1 WO 2012039102A1
Authority
WO
WIPO (PCT)
Prior art keywords
search space
allocation information
grant
terminal
area
Prior art date
Application number
PCT/JP2011/005015
Other languages
English (en)
Japanese (ja)
Inventor
斉藤　佳子
中尾　正悟
綾子 堀内
今村　大地
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2012039102A1 publication Critical patent/WO2012039102A1/fr

Links

Images

Classifications

    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • 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
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a base station, a terminal, a transmission method, and a reception method.
  • 3GPP-LTE (3rd Generation Partnership Project Project Radio Access Network Network Long Term Evolution (hereinafter referred to as LTE) employs OFDMA (Orthogonal Frequency Division Multiple Access) as a downlink communication method and SC-FDMA (uplink communication method as an uplink communication method).
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA uplink communication method as an uplink communication method
  • Single Carrier Frequency Division Multiple Access is employed (for example, see Non-Patent Documents 1, 2, and 3).
  • a radio communication base station apparatus uses a radio communication terminal apparatus (hereinafter referred to as “subframe”) for each time unit called a subframe. Communication is performed by assigning to “terminal”.
  • the base station transmits allocation control information (L1 / L2 control information) for notifying resource allocation results for downlink data and uplink data to the terminal.
  • allocation control information DCI (Downlink Control Information) which is downlink allocation control information is transmitted.
  • the DCI includes two types of DCI (to be described later): a common DCI for all terminals and an individual DCI for a specific terminal (a specific terminal or a terminal in a specific group).
  • control information such as DCI is transmitted to the terminal using a downlink control channel such as PDCCH (Physical Downlink Control Channel).
  • PDCCH Physical Downlink Control Channel
  • the base station controls the amount of resources used for PDCCH transmission, that is, the number of OFDM symbols, in units of subframes according to the number of terminals allocated.
  • the amount of resources used for PDCCH transmission is set variably between three OFMD symbols from the first OFDM symbol to the third OFDM symbol in one subframe in the time domain over the entire system band in the frequency domain. Is done.
  • the base station uses CFI (Control Format Indicator), which is information indicating the number of OFDM symbols that can be used for PDCCH transmission, in the first OFDM symbol of each subframe, using PCFICH (Physical Control Format Indicator Channel). Notify The terminal receives DCI according to the CFI detected from the received PCFICH. Also, the base station transmits HI (HARQ Indicator) indicating delivery confirmation information (ACK / NACK) for uplink data to the terminal using PHICH (Physical Hybrid ARQ Indicator CHannel) (for example, see Non-Patent Document 1). ). Note that LTE supports a frequency band having a maximum width of 20 MHz as a system bandwidth.
  • CFI Control Format Indicator
  • each PDCCH occupies a resource composed of one or a plurality of continuous CCEs (Control Channel Element).
  • CCE is the minimum unit of radio resources allocated to PDCCH.
  • the CCE is composed of a plurality of consecutive REGs (Resource Element Group) composed of resource elements (RE: Resource Element).
  • REG Resource Element
  • one REG is composed of four REs.
  • the CCE is configured by a plurality of consecutive REGs (for example, nine consecutive REGs) among the REGs that are not allocated as the above-described PCFICH and PHICH radio resources.
  • the base station may perform interleaving processing in units of REGs for PDCCH resources addressed to each terminal in order to randomize interference.
  • the number of CCEs occupied by the PDCCH (the number of CCE connections: CCE aggregation level) is one of 1, 2, 4, and 8 depending on the number of information bits of the allocation control information or the channel state of the terminal. Is selected.
  • the terminal since the terminal does not know which CCE is assigned to the PDCCH destined for the terminal and the number of connected CCEs, the terminal may be assigned to the PDCCH destined for the terminal. It is necessary to perform a brute force trial (blind decoding) for all CCEs. For this reason, as described above, by providing a CCE constraint (Tree-based structure) that can be allocated to the PDCCH, the number of PDCCH decoding attempts in the terminal can be reduced.
  • a CCE constraint Tele-based structure
  • the base station transmits a plurality of DCIs simultaneously via a plurality of PDCCHs.
  • the base station transmits the CRC bits masked (or scrambled) with the terminal ID of the transmission destination in the PDCCH in order to identify the transmission destination terminal of each PDCCH.
  • the terminal attempts to decode DCI by demasking (or descrambling) the CRC bits with the terminal ID of the terminal in a plurality of PDCCHs that may be destined for the terminal (hereinafter referred to as blind decoding). Then, the DCI addressed to its own terminal is detected.
  • C-SS Common search space
  • UE-SS terminal specific Search Space
  • C-SS is a search space common to all terminals, and indicates a range of CCEs in which all terminals perform blind decoding on DCI.
  • control information for example, dynamic broadcast channel (D-BCH), paging channel (PCH), RACH response, etc.
  • D-BCH dynamic broadcast channel
  • PCH paging channel
  • RACH response etc.
  • the PDCCH for transmitting "common channel allocation control information" is allocated.
  • UE-SS is a search space specific to each terminal, and is set randomly for each terminal.
  • the UE-SS of each terminal is set using the terminal ID of each terminal and a hash function that is a function for performing randomization.
  • the number of CCEs constituting this UE-SS is defined for each number of PCECH connected CCEs.
  • the number of CCEs constituting the search space is 6CCE, 12CCE, 8CCE, and 16CCE corresponding to the number of CCE connections 1, 2, 4, and 8 of PDCCH, respectively.
  • a UE-SS is assigned a PDCCH for transmitting uplink scheduling information and downlink scheduling information addressed to the target terminal.
  • each terminal needs to perform blind decoding only on the blind decoding region candidate group in the search space (C-SS and UE-SS) allocated to itself in each subframe. The number of times can be reduced.
  • the C-SS and the UE-SS may be set redundantly, and the UE-SS may be set redundantly.
  • the base station may not be able to assign a CCE to a PDCCH addressed to a specific terminal.
  • the probability that the CCE cannot be assigned to the PDCCH in this way is called blockingabilityprobability.
  • CCE 0 to CCE 31 (CCE numbers 0 to 31) are defined.
  • the base station sequentially assigns CCEs to the PDCCH addressed to each terminal.
  • CCE2 to CCE9 and CCE13 to CCE19 are already assigned to the PDCCH.
  • the base station may already have CCE4 to CCE9 (all CCEs in the UE-SS) to other PDCCHs. Since it is assigned, CCE cannot be assigned to this PDCCH.
  • CCE concatenation number 4
  • CCE0 and CCE1 among 4 CCEs CCE0 to CCE3 have already been assigned to other PDCCHs
  • CCE6 and CCE7 among 4CCEs CCE4 to CCE7 have already been assigned to other PDCCHs.
  • the base station changes the number of CCE connections, and allocates a plurality of continuous CCEs to the PDCCH addressed to the terminal based on the changed CCE connection number.
  • CCE2 to CCE9 and CCE13 to CCE19 have already been assigned, as in the above example.
  • the base station changes the number of CCE connections from 1 to 2.
  • CCE4 to CCE9 6CCE
  • CCE8 to CCE19 (12CCE).
  • downlink control information transmitted from the base station is called DCI, and information (resource allocation information) of resources allocated to the terminal by the base station, MCS (Modulation & channel? Coding? Scheme), etc. Is included.
  • DCI Downlink Control information
  • MCS Modulation & channel? Coding? Scheme
  • the terminal needs to receive both downlink allocation control information (downlink allocation control information) and uplink allocation control information (uplink allocation control information).
  • DCI downlink control information
  • a downlink allocation control information format for performing continuous band allocation hereinafter simply referred to as “downlink allocation control information”
  • uplink allocation hereinafter simply referred to as “uplink allocation”.
  • Control information has the same size.
  • DCI format include type information (for example, a 1-bit flag) indicating the type of allocation control information (downlink allocation control information or uplink allocation control information).
  • the terminal includes the type included in the allocation control information. By confirming the information, it can be specified whether it is downlink allocation control information or uplink allocation control information.
  • DCI format 0 the DCI format when uplink allocation control information for performing continuous band allocation is transmitted
  • DCI format 1A DCI format 1A
  • DCI 0 and DCI 1A have the same size and can be distinguished by type information. Therefore, in the following description, DCI 0 and DCI 1A are collectively expressed as DCI 0 / 1A.
  • the DCI format includes a DCI format for performing common channel allocation (DCI format 1C: hereinafter referred to as DCI 1C), and a DCI format for performing non-contiguous bandwidth allocation in the downlink (DCI format 1: below, DCI 1) and a DCI format (DCI format 2, 2A: hereinafter referred to as DCI 2, 2A) for assigning spatial multiplexing MIMO transmission.
  • DCI formats include DCI format 1B, 1D (hereinafter referred to as DCI 1B, 1D).
  • DCI 1, 1B, 1D, 2, and 2A are formats used depending on the downlink transmission mode of the terminal (format of individual DCI).
  • DCI 1, 1B, 1D, 2, 2A are all formats set for each terminal.
  • DCI 0 / 1A is a format that can be used for terminals in any transmission mode without depending on the transmission mode. That is, DCI 0 / 1A is a format (common DCI format) used in common for all terminals. When DCI 0 / 1A is used, 1 antenna transmission or transmission diversity is used as the default transmission mode.
  • DCI 1A used for common channel allocation and DCI 0 / 1A used for terminal-specific data allocation have the same size, but are distinguished from each other by terminal ID.
  • the base station applies CRC masking to the DCI 1A used for common channel assignment so that they can be distinguished from each other by terminal IDs common to all terminals.
  • the base station applies CRC masking to DCI 0 / 1A used for terminal-specific data allocation so that they can be distinguished from each other by terminal IDs allocated to individual terminals. Therefore, the base station can also transmit DCI 0 / 1A that performs terminal-specific data allocation by C-SS without increasing the number of times of terminal blind decoding.
  • LTE-A 3GPP LTE-Advanced
  • LTE-A terminal a base station and a terminal capable of communicating at a wideband frequency of 40 MHz or more.
  • LTE-A terminals The LTE-A system is required to accommodate not only LTE-A terminals but also terminals corresponding to the LTE system (hereinafter referred to as “LTE terminals”).
  • DCI formt0A, 0B hereinafter referred to as DCI 0A, 0B
  • DCI 0A and 0B are DCI formats that depend on the uplink transmission mode.
  • the terminal blinds each PDCCH of the above three types of DCI formats.
  • Decode monitoring
  • LTE-A stipulates the introduction of a wireless communication relay device (hereinafter referred to as a relay station) in order to achieve increased coverage.
  • a wireless communication relay device hereinafter referred to as a relay station
  • R-PDCCH Relay-Physical-DownlinkReControl CHannel
  • PDSCH Physical Downlink Shared Shared CHannel
  • R-PDCCH The mapping start position in the time axis direction of R-PDCCH is fixed to the fourth OFDM symbol from the beginning of one subframe. This does not depend on the ratio of PDCCH to the time axis direction.
  • Two mapping methods, distributed and localized, are supported as mapping methods in the frequency axis direction of the R-PDCCH.
  • CRS Common Reference Signal
  • DM-RS Demodulation Reference Signal
  • Each R-PDCCH is divided into slot 0 (slot 0 or first slot) and slot 1 (slot 1 or second slot) within one subframe in the time domain.
  • a slot border between slot 0 and slot 1 is between the seventh OFDM symbol and the eighth OFDM symbol from the top of one subframe.
  • Each R-PDCCH occupies a resource composed of one or a plurality of consecutive R-CCEs (Relay-Control Channel Elements).
  • CCE and R-CCE are not distinguished and may be simply referred to as CCE.
  • a search space for downlink resource allocation information (hereinafter also referred to as DL grant) is provided in slot 0, and a search space for uplink resource allocation information (hereinafter also referred to as UL grant) is a slot. 1 is provided.
  • slot 0 When there is no DL grant to be transmitted, slot 0 may be an empty area, and when there is no UL grant to be transmitted, data may be arranged in slot 1.
  • the R-PDCCH region is set to semi-static.
  • the PDCCH area the resource area to which the PDCCH is mapped. If the PDCCH cannot be mapped due to lack of resources, downlink data cannot be allocated to the terminal. Therefore, even if a resource area (hereinafter referred to as a PDSCH area) to which downlink data is mapped cannot be used, the system throughput cannot be used. May fall.
  • a resource area hereinafter referred to as a PDSCH area
  • an environment in which various types of cells such as a femto cell and a pico cell are mixed for example, a heterogeneous network environment including a macro cell, a pico cell / femto cell, etc.
  • a heterogeneous network environment including a macro cell, a pico cell / femto cell, etc. for example, a heterogeneous network environment including a macro cell, a pico cell / femto cell, etc.
  • interference in the PDCCH region increases due to the influence of other cells in any cell.
  • the Non-CSG terminal receives large interference from the Femto cell.
  • the terminal when a terminal connected to the Pico cell is located near the cell edge of the Pico cell (for example, a Range-expansion region), the terminal receives a large interference from the Macro cell. For this reason, in the PDCCH region, the PDCCH reception performance at each terminal deteriorates.
  • DCI for terminals connected to a base station is mapped to the R-PDCCH area described above in addition to the PDCCH area.
  • the R-PDCCH region is set to semi-static.
  • the R-PDCCH region is set to semi-static in accordance with an increase or decrease in the number of terminals that are resource allocation targets (DCI transmission targets). Therefore, in order to map the DCI for terminals to the R-PDCCH region, considering that the number of terminals to be allocated fluctuates for each subframe, an R- having a margin so that the number of terminals can be increased or decreased. It is considered that a PDCCH region is secured.
  • the downlink (DL) traffic volume is larger than the uplink (UL) traffic volume.
  • the terminal is becoming similar to the usage pattern in the Internet connection such as a PC (Personal Computer) with the shift of the usage pattern of the terminal from only voice communication to video communication such as game and broadcast.
  • the ratio of data volume between download and upload (download / upload) over the Internet connection is reported as 1.43 (for example, “Understanding the total amount of traffic on the Internet in Japan” 2009, Ministry of Internal Affairs and Communications http: // www .soumu.go.jp / main_content / 000055966.pdf).
  • DL-grant is considered to have a larger amount of information than UL-grant.
  • the configuration of the R-PDCCH region in the time domain is composed of slot 0 and slot 1 as described above, and the slot boundary is defined by the seventh OFDM symbol and the eighth OFDM symbol from the beginning of one subframe.
  • the number of REs per 1 RB in slot 0 is 44 (excluding CRS), and the number of REs per 1 RB in slot 1 is 72 (excluding CRS). Therefore, it can be said that the resource amount of slot 1 to which UL grant is assigned is larger than the resource amount of slot 0 to which DL grant is assigned.
  • UE-SS is a search space specific to each terminal, and is set randomly for each terminal. For this reason, in the R-PDCCH region, when the terminal-specific DCI is mapped, the UE-SS is randomly set for each terminal. Therefore, as described above, in particular, although the amount of UL grant information is smaller than the amount of DL grant information, the slot 1 to which UL grant is assigned is more than the resource amount of slot 0 to which DL grant is assigned. In a situation where the amount of resources is greater (see, for example, FIG. 1), UL slots may be scattered and mapped in slot 1. That is, in slot 1, there are discontinuous areas (empty shown in FIG. 1) to which UL grant is not assigned.
  • slot 1 area in the area to which slot 1 is mapped (hereinafter referred to as slot 1 area), if an area to which UL grant is not assigned (empty) is left empty, resource allocation is instructed. Although the amount of control information (DL grant information amount) does not increase, useless resources increase and resource utilization efficiency decreases (see, for example, FIG. 2A). On the other hand, it is conceivable to improve the resource utilization efficiency in slot 1 by assigning data to an area (empty) to which no UL grant is assigned (for example, see FIG. 2B). However, as described above, there is a high possibility that a region (empty) to which UL grant is not allocated exists discontinuously.
  • the amount of control information for instructing resource allocation increases, and as a result, the area to which slot 0 is mapped (hereinafter, There is a problem that the slot 0 area) becomes tight.
  • the first method is to assign DL grant to not only the slot 0 area but also the slot 1 area (see, for example, FIG. 3A). Furthermore, DL grant assigned to the slot 0 region, and DL grant and UL grant assigned to the slot 1 region are arranged together in a specific frequency region (see FIG. 3B). That is, in the slot 0 area and the slot 1 area, DL grant and UL grant are arranged so as not to be discontinuously free. As a result, a continuous free area can be secured as a data area (PDSCH area) (see FIG. 3B).
  • the decoding of data (downlink data) allocated to the PDSCH region is started after the decoding of DL grant is completed.
  • DL grant is also assigned to the slot 1 region, so decoding delay becomes a problem.
  • the search space different from UE-SS set at random for each terminal that is, the search space is individually set according to the arrangement of DL grant and UL grant allocated to the slot 0 area and the slot 1 area. It is necessary to instruct. Therefore, there is a problem that signaling for indicating the search space increases.
  • the second method is a method of assigning UL grant (see FIG. 4A) assigned to the slot 1 area to the slot 0 area (see FIG. 4B).
  • UL grant see FIG. 4A
  • PDSCH area data area
  • the slot 0 area has a smaller amount of resources than the slot 1 area, and the slot 0 area is assigned DL grant with a larger amount of information. Therefore, if UL grant is further assigned to the slot 0 area by this method, there is a problem that the slot 0 area becomes more tight.
  • An object of the present invention is to improve the resource utilization efficiency and improve the system throughput when mapping DCI for a terminal connected to the base station to the R-PDCCH region, and to improve the system throughput.
  • a method and a receiving method are provided.
  • a base station is a control channel that maps downlink allocation information and uplink allocation information for one terminal to the same resource region as a resource region to which data for each terminal is allocated,
  • a base station that transmits on the control channel comprising a first region and a second region, and means for setting a search space for each of the downlink allocation information and the uplink allocation information in the control channel,
  • the search space is a first search space for the uplink allocation information set in the second area, and at least for the downlink allocation information and the uplink allocation information set in the first area.
  • a setting means including a shared search space; and the specific uplink allocation information having the same size as the specific downlink allocation information. Assigned to over scan, the uplink allocation information other than the specific uplink allocation information, a configuration having a, and assignment means for assigning the first search space.
  • a terminal is a control channel in which downlink allocation information and uplink allocation information for its own device are mapped to the same resource area as a resource area to which data for each terminal is allocated.
  • a terminal for receiving on the control channel consisting of a second area and a second area, and performing blind decoding on the downlink allocation information and the shared search space for the uplink allocation information set in at least the first area Obtaining the specific uplink allocation information having the same size as the specific downlink allocation information, blindly decoding the search space for the uplink allocation information set in the second region, and First receiving means for obtaining uplink allocation information other than allocation information; and mapping an uplink data signal to an uplink data channel based on the uplink allocation information It adopts a configuration comprising a mapping means.
  • the transmission method is a control channel in which downlink allocation information and uplink allocation information for one terminal are mapped to the same resource area as a resource area to which data for each terminal is allocated,
  • a transmission method for transmitting on the control channel comprising a first region and a second region, wherein a search space for each of the downlink allocation information and the uplink allocation information is set in the control channel, and the search space is A first search space for the uplink allocation information set in the second area, and a shared search space for the downlink allocation information and the uplink allocation information set in at least the first area.
  • the uplink allocation information other than the uplink allocation information of a constant is assigned to the first search space.
  • the reception method is a control channel in which downlink allocation information and uplink allocation information for one terminal are mapped to the same resource area as a resource area to which data for each terminal is allocated,
  • a reception method for receiving on the control channel comprising a first area and a second area, wherein a shared search space for the downlink allocation information and the uplink allocation information set in at least the first area Blind decoding, obtaining the specific uplink allocation information having the same size as the specific downlink allocation information, blindly decoding the search space for the uplink allocation information set in the second region, Obtain uplink allocation information other than specific uplink allocation information, and map an uplink data signal to an uplink data channel based on the uplink allocation information
  • region which concerns on one embodiment of this invention The figure used for description of allocation of DL grant and UL grant according to an embodiment of the present invention
  • the block diagram which shows the main structures of the base station which concerns on one embodiment of this invention The block diagram which shows the main structures of the terminal which concerns on one embodiment of this invention
  • the block diagram which shows the structure of the base station which concerns on one embodiment of this invention The figure which shows the search space set to the terminal which concerns on one embodiment of this invention
  • the R-PDCCH is divided into slot 0 (slot 0) and slot 1 (slot 1) within one subframe in the time domain.
  • slot 0 is mapped to a resource area earlier than slot 1 in the time domain.
  • the communication system includes base station 100 and terminal 200.
  • Base station 100 is an LTE-A base station
  • terminal 200 is an LTE-A terminal.
  • FIG. 5 shows main components of base station 100 according to the present embodiment.
  • the base station 100 shown in FIG. 5 has a DL region (downlink resource allocation information) and a UL region (uplink resource allocation information) for one terminal 200 in the same resource region as the PDSCH region to which data for each terminal 200 is allocated.
  • the search space setting unit 103 is means for setting a search space for each of DL grant and UL grant in the R-PDCCH, and the search space is set in slot 1 and is a first search space for UL grant, And a shared search space for DL grant and UL grant set in at least slot 0.
  • the assigning unit 106 assigns a specific UL grant having the same size as the specific DL grant to the shared search space, and assigns a UL grant other than the specific UL grant to the first search space.
  • FIG. 6 shows main components of terminal 200 according to the present embodiment.
  • terminal 200 shown in FIG. 6 DL grant (downlink resource allocation information) and UL grant (uplink resource allocation information) for its own device are mapped to the same resource region as the PDSCH region to which data for each terminal 200 is allocated.
  • the R-PDCCH consisting of slot 0 (first area) and slot 1 (second area) is received.
  • the PDCCH receiving unit 207 blind-decodes the shared search space for DL grant (downlink resource allocation information) and UL grant (uplink resource allocation information) set in at least slot 0, and sets the same size as a specific DL ⁇ grant.
  • the mapping unit 212 maps the uplink data signal to the PUSCH (uplink data channel) based on UL grant.
  • FIG. 7 is a block diagram showing a configuration of base station 100 according to Embodiment 1 of the present invention.
  • setting section 101 sets a resource area (transmission area) used for DCI transmission for terminal 200 and sets transmission modes for the uplink and downlink of terminal 200. .
  • the setting of the resource area and the setting of the transmission mode are performed for each terminal 200 to be set.
  • the setting unit 101 includes a transmission area setting unit 131 and a transmission mode setting unit 132.
  • the transmission area setting unit 131 sets an R-PDCCH area for each terminal 200 as an area (transmission area) for transmitting individual DCI of the terminal 200.
  • the transmission mode setting unit 132 determines the transmission mode (for example, spatial multiplexing MIMO transmission, beamforming transmission, non-contiguous band allocation) for each uplink and downlink of each terminal 200 based on the propagation path condition for each terminal 200 and the like. Etc.).
  • the setting unit 101 receives information indicating the DCI transmission area set for each terminal 200 and setting information including information indicating the transmission mode, the control unit 102, the search space setting unit 103, and the encoding / modulation. Output to the unit 107. Note that these pieces of information included in the setting information are reported to each terminal 200 via the encoding / modulation section 107 as higher layer control information (referred to as RRC control information or RRC signaling).
  • the control unit 102 generates allocation control information according to the setting information input from the setting unit 101.
  • the control unit 102 generates allocation control information including MCS information, resource (RB) allocation information, NDI (New data indicator), and the like for one transport block to be transmitted.
  • the resource allocation information generated by the control unit 102 includes uplink resource allocation information indicating an uplink resource (for example, PUSCH (Physical Uplink Shared Channel)) to which uplink data of the terminal 200 is allocated, or addressed to the terminal 200.
  • uplink resource allocation information indicating a downlink resource for example, PDSCH (PhysicalPDDownlink Shared) Channel) to which downlink data is allocated is included.
  • control unit 102 corresponds to the DCI format (either DCI 0A or 0B) corresponding to the uplink transmission mode of terminal 200, or according to the downlink transmission mode.
  • Allocation control information is generated in accordance with the DCI format (DCI 1, 1B, 1D, 2, 2A) or the DCI format common to all terminals (DCI 0 / 1A).
  • the control unit 102 At the time of normal data transmission, the control unit 102 generates allocation control information in a format (DCI 1, 1B, 1D, 2, 2A) corresponding to the transmission mode for each terminal 200. Thereby, since data transmission can be performed in the transmission mode set in each terminal 200, the throughput can be improved.
  • control unit 102 generates allocation control information in a format (DCI 0 / 1A) common to all terminals, and transmits data using a robust default transmission mode. As a result, robust data transmission is possible even when the propagation environment changes suddenly.
  • the control unit 102 when transmitting higher layer control information (RRC signaling) for notifying a change in transmission mode when the channel condition deteriorates, the control unit 102 also assigns allocation control information (DCI 0/0) common to all terminals. 1A) and transmit information using the default transmission mode.
  • DCI 0/0 allocation control information
  • the number of information bits of DCI 0 / 1A common to all terminals is smaller than the number of information bits of DCI 1, 1B, 1D, 2, 2A, 0A, 0B depending on the transmission mode.
  • DCI 0 / 1A can transmit at a lower coding rate than DCI 1, 1B, 1D, 2, 2A, 0A, 0B. Therefore, when the propagation path condition deteriorates, the control unit 102 can use DCI 0 / 1A to receive the allocation control information (and data) with a good error rate even in the terminal 200 having a poor propagation path condition. it can.
  • control unit 102 allocates common channel allocation control information (for example, DCI 1C) for data allocation common to a plurality of terminals such as broadcast information and paging information. , 1A).
  • common channel allocation control information for example, DCI 1C
  • control unit 102 outputs the MCS information and the NDI among the generated allocation control information for terminal-specific data allocation to the PDCCH generation unit 104, and outputs the uplink resource allocation information to the PDCCH generation unit 104 and the extraction unit 117. Then, the downlink resource allocation information is output to the PDCCH generation unit 104 and the multiplexing unit 109. In addition, the control unit 102 outputs the generated common channel allocation control information to the PDCCH generation unit 104.
  • the search space setting unit 103 sets an individual search space (UE-SS) based on the DCI transmission area for each terminal 200 indicated in the setting information input from the setting unit 101.
  • the individual search space (UE-SS) is an individual search space for each terminal.
  • the search space setting unit 103 for example, the UE-SS of a certain terminal, the CCE number calculated using the terminal ID of the terminal and a hash function that performs randomization, and the number of CCEs constituting the search space Calculate from (L).
  • FIG. 8 is a diagram illustrating a setting example of the UE-SS for the C-SS and a certain terminal 200.
  • four DCI allocation area candidates (that is, CCE 0 to 3, CCE 4 to 7, CCE 8 to 11, and CCE 12 to 15) are set as C-SS with respect to the number of CCE connections of PDCCH.
  • two DCI allocation region candidates (that is, CCE 0 to 7 and CCE 8 to 15) are set as C-SS for the number of CCE connections of PDCCH. That is, in FIG. 8, a total of six DCI allocation area candidates are set as C-SS.
  • six DCI allocation region candidates (that is, each of CCEs 16 to 21) are set as UE-SS for a CCE concatenation number of 1.
  • For DCE connection number 2 six DCI allocation area candidates (that is, two CCEs 6 to 17 divided into two) are set as UE-SS.
  • two DCI allocation area candidates (that is, CCE 20 to 23, CCE 24 to 27) are set as UE-SS.
  • two DCI allocation area candidates ie, CCE 16 to 23, CCE 24 to 31) are set as UE-SS. That is, in FIG. 8, a total of 16 DCI allocation area candidates are set as UE-SS.
  • search space setting section 103 sets the search space for DL grant to the slot 0 region as described above, and UL The search space for grant is set in the slot 1 area.
  • the search space setting unit 103 determines that DL grant and UL grant having the same DCI size are assigned based on the transmission mode set for a certain terminal 200, the search space setting unit 103 Set up a shared search space for UL grant.
  • the shared search space is set at least in the slot 0 area (that is, only the slot 0 area, or the slot 0 area and the slot 1 area).
  • the search space setting unit 103 shares the search space set in each of DL grant and UL grant having the same DCI size between DL grant and UL grant. Details of the search space setting process in the search space setting unit 103 will be described later.
  • search space setting section 103 outputs search space information indicating the set UE-SS of each terminal 200 to allocation section 106 and encoding / modulation section 107.
  • the PDCCH generation unit 104 receives allocation control information for terminal-specific data allocation input from the control unit 102 (that is, uplink resource allocation information, downlink resource allocation information, MCS information, NDI, etc. for each terminal). And DCI including uplink resource allocation information or downlink resource allocation information). At this time, the PDCCH generation unit 104 adds CRC bits to the uplink allocation control information and downlink allocation control information generated for each terminal, and further masks (or scrambles) the CRC bits with the terminal ID. Then, PDCCH generation section 104 outputs the DCI after masking to encoding / modulation section 105.
  • the encoding / modulation unit 105 modulates the DCI input from the PDCCH generation unit 104 after encoding, and outputs the modulated signal to the allocation unit 106.
  • the encoding / modulation section 105 sets the coding rate based on channel quality information (CQI: Channel Quality ⁇ Indicator) information reported from each terminal so that each terminal can obtain sufficient reception quality.
  • CQI Channel Quality ⁇ Indicator
  • the coding / modulation section 105 sets a lower coding rate as the terminal is located near the cell boundary (that is, as the terminal has poor channel quality).
  • Allocation unit 106 inputs DCI including allocation control information (downlink resource allocation information or uplink resource allocation information) for terminal-specific data allocation to each terminal 200, input from coding / modulation section 105, into search space setting section Assigned to R-CCE (DCI allocation region candidate) in UE-SS for each terminal indicated in the search space information input from 103.
  • the assigning unit 106 assigns a specific UL grant having the same size as the specific DL grant to the shared search space, and assigns a UL grant other than the specific UL grant to the search space set in the slot 1 area. .
  • the assigning unit 106 assigns DL grant to the search space set in the slot 0 area.
  • the allocation unit 106 Assign CCE in the configured UE-SS to DCI.
  • the DCI format for the allocation target terminal is a format common to all terminals (for example, DCI 0 / 1A)
  • the allocation unit 106 is set for the CCE in the C-SS or the allocation target terminal. Assign a CCE in the UE-SS to the DCI.
  • the number of CCE concatenations allocated to one DCI differs depending on the coding rate and the number of DCI bits (that is, the amount of allocation control information). For example, since the coding rate of DCI addressed to a terminal located near the cell boundary is set low, more physical resources are required. Therefore, assignment section 106 assigns more CCEs to DCI addressed to terminals located near the cell boundary.
  • allocation section 106 outputs information on CCE allocated to DCI to multiplexing section 109 and ACK / NACK reception section 120. Also, allocation section 106 outputs the encoded / modulated DCI to multiplexing section 109.
  • the encoding / modulation unit 107 modulates the setting information input from the setting unit 101 and the search space information input from the search space setting unit 103 (that is, control information of the upper layer) after channel encoding,
  • the modulated setting information and search space information are output to multiplexing section 109.
  • Encoding / modulating section 108 modulates input transmission data (downlink data) after channel coding, and outputs the modulated transmission data signal to multiplexing section 109.
  • the multiplexing unit 109 receives the encoded / modulated DCI signal input from the allocating unit 106, the setting information input from the encoding / modulating unit 107, search space information (that is, control information of the upper layer), and The data signal (that is, PDSCH signal) input from the encoding / modulation unit 108 is multiplexed in the time domain and the frequency domain.
  • the multiplexing unit 109 maps the PDCCH signal and the data signal (PDSCH signal) based on the downlink resource allocation information input from the control unit 102, and outputs the multiplexed signal to the IFFT unit 110.
  • the multiplexing unit 109 may map the setting information and the search space information to the PDSCH.
  • the IFFT unit 110 converts the multiplexed signal for each antenna input from the multiplexing unit 109 into a time waveform, and the CP adding unit 111 obtains an OFDM signal by adding the CP to the time waveform.
  • the transmission RF unit 112 performs transmission radio processing (up-conversion, digital analog (D / A) conversion, etc.) on the OFDM signal input from the CP adding unit 111 and transmits the signal via the antenna 113.
  • transmission radio processing up-conversion, digital analog (D / A) conversion, etc.
  • the reception RF unit 114 performs reception radio processing (down-conversion, analog digital (A / D) conversion, etc.) on the reception radio signal received in the reception band via the antenna 113, and the obtained reception signal is processed.
  • the data is output to the CP removal unit 115.
  • CP removing section 115 removes CP from the received signal
  • FFT (Fast Fourier Transform) section 116 converts the received signal after CP removal into a frequency domain signal.
  • the extraction unit 117 extracts uplink data from the frequency domain signal received from the FFT unit 116 based on the uplink resource allocation information received from the control unit 102, and the IDFT (Inverse Discrete Fourier transform) unit 118 The signal is converted into a signal, and the time domain signal is output to the data receiver 119 and the ACK / NACK receiver 120.
  • IDFT Inverse Discrete Fourier transform
  • the data receiving unit 119 decodes the time domain signal input from the IDFT unit 118. Data receiving section 119 then outputs the decoded uplink data as received data.
  • the ACK / NACK receiving unit 120 extracts an ACK / NACK signal from each terminal for downlink data (PDSCH signal) from the time domain signal received from the IDFT unit 118. Specifically, the ACK / NACK receiving unit 120 extracts the ACK / NACK signal from the uplink control channel (for example, PUCCH (Physical-Uplink-Control-Channel)) based on the information input from the allocation unit 106. .
  • the uplink control channel is an uplink control channel associated with the CCE used for transmission of downlink allocation control information corresponding to the downlink data.
  • the ACK / NACK receiving unit 120 performs ACK / NACK determination of the extracted ACK / NACK signal.
  • each terminal determines the PUCCH used for transmission of the ACK / NACK signal based on the CCE in which downlink allocation control information (DCI) to the terminal is mapped according to this association.
  • DCI downlink allocation control information
  • FIG. 9 is a block diagram showing a configuration of terminal 200 according to Embodiment 1 of the present invention.
  • Terminal 200 receives downlink data and transmits an ACK / NACK signal for the downlink data to base station 100 using PUCCH that is an uplink control channel.
  • the reception RF unit 202 sets the reception band based on the band information received from the setting information reception unit 206.
  • the reception RF unit 202 performs reception radio processing (down-conversion, analog digital (A / D) conversion, etc.) on a radio signal (here, an OFDM signal) received in the reception band via the antenna 201, and is obtained.
  • the received signal is output to the CP removing unit 203.
  • the received signal may include PDSCH signal, DCI, and higher layer control information including setting information and search space information.
  • the DCI (assignment control information) addressed to the terminal 200 is a common search space (C-SS) set for the terminal 200 and other terminals, or an individual search space set for the terminal 200. (UE-SS).
  • C-SS common search space
  • CP removing section 203 removes the CP from the received signal, and FFT section 204 converts the received signal after the CP removal into a frequency domain signal. This frequency domain signal is output to the separation unit 205.
  • the demultiplexing unit 205 outputs to the PDCCH receiving unit 207 a component that may contain DCI among signals received from the FFT unit 204 (that is, a signal extracted from the PDCCH region and the R-PDCCH region). Separating section 205 outputs a higher layer control signal including setting information (for example, RRC signaling) to setting information receiving section 206, and outputs a data signal (that is, PDSCH signal) to PDSCH receiving section 208.
  • setting information for example, RRC signaling
  • the setting information receiving unit 206 receives the band information set for the own terminal, the information indicating the terminal ID set for the own terminal, the search space set for the own terminal from the upper layer control signal input from the separating unit 205 Information, information indicating a reference signal set in the own terminal, and information indicating a transmission mode set in the own terminal are read.
  • the band information set in the own terminal is output to the PDCCH reception unit 207, the reception RF unit 202, and the transmission RF unit 215.
  • information indicating the terminal ID set to the own terminal is output to the PDCCH receiving unit 207 as terminal ID information.
  • the search space information set in the own terminal is output to PDCCH receiving section 207 as search space area information.
  • information indicating the transmission mode set for the terminal itself is output to PDCCH receiving section 207 as transmission mode information.
  • the PDCCH receiving unit 207 performs blind decoding (monitoring) on the DCI input from the separation unit 205 to obtain DCI addressed to the terminal itself.
  • the PDCCH receiving unit 207 has a DCI format for data allocation common to all terminals (for example, DCI 0 / 1A) and a DCI format (for example, DCI 1, 1B, 1D, 2, 2A, 0A, or 0B) and a DCI format for common channel allocation common to all terminals (for example, DCI 1C, 1A) are subjected to blind decoding. Thereby, DCI including allocation control information of each DCI format is obtained.
  • the PDCCH receiving unit 207 first applies a DCI format (DCI 1C, 1A) for common channel assignment to the C-SS indicated in the search space area information input from the setting information receiving unit 206 and Blind decoding of the DCI format for data allocation common to all terminals (DCI 0 / 1A) is performed. That is, PDCCH receiving section 207 determines the size of the DCI format for common channel assignment and data common to all terminals for each blind decoding area candidate in C-SS (that is, a candidate for CCE area allocated to terminal 200). Demodulate and decode for the size of the DCI format for allocation.
  • DCI 1C, 1A DCI format for common channel assignment to the C-SS indicated in the search space area information input from the setting information receiving unit 206
  • Blind decoding of the DCI format for data allocation common to all terminals DCI 0 / 1A
  • PDCCH receiving section 207 determines the size of the DCI format for common channel assignment and data common to all terminals for each blind decoding area candidate in C
  • the PDCCH receiving unit 207 determines whether the DCI 0 / 1A allocation control information is for the common channel or the data allocation for the own terminal among terminal IDs (a plurality of terminals). They are distinguished by a common ID or a terminal ID of the terminal 200).
  • the PDCCH receiving unit 207 when including the R-PDCCH region as the search space region indicated by the search space region information input from the setting information receiving unit 206, includes the search space region and the uplink resource allocation information (DL (grant).
  • DL uplink resource allocation information
  • the shared search space set in the slot 0 area or the slot 1 area of the corresponding R-PDCCH area is blind-decoded ( Monitor) to obtain DCI addressed to the terminal itself.
  • the PDCCH receiving unit 207 performs blind decoding on the shared search space to obtain a specific UL grant having the same size as the specific DL grant, and the search space for UL grant set in the slot 1 area. To obtain a UL grant other than a specific UL grant.
  • PDCCH reception unit 207 is conscious of the search space of terminal 200 without being aware of the search space. Blind decoding may be performed in a plurality of DCI transmission areas that may be addressed to 200.
  • PDCCH receiving section 207 outputs downlink resource allocation information included in DCI addressed to its own terminal to PDSCH receiving section 208 when receiving downlink allocation control information, and when receiving uplink allocation control information, PDCCH receiving section 207 receives uplink allocation control information.
  • the resource allocation information is output to the mapping unit 212.
  • PDSCH receiving section 208 extracts received data (downlink data) from the PDSCH signal input from demultiplexing section 205 based on the downlink resource allocation information input from PDCCH receiving section 207. That is, PDSCH receiving section 208, based on downlink resource allocation information (allocation control information) addressed to terminal 200 allocated to any of a plurality of DCI allocation area candidates (blind decoding area candidates), downlink data ( Downlink data signal) is extracted. Thereby, downlink data (downlink data signal) is received. PDSCH receiving section 208 also performs error detection on the extracted received data (downlink data).
  • the PDSCH receiving unit 208 generates a NACK signal as the ACK / NACK signal, and if there is no error in the received data, the PDSCH receiving unit 208 receives the ACK / NACK signal as the ACK / NACK signal. Generate a signal. This ACK / NACK signal is output to modulation section 209.
  • Modulation section 209 modulates the ACK / NACK signal input from PDSCH reception section 208 and outputs the modulated ACK / NACK signal to mapping section 212.
  • Modulation section 210 modulates transmission data (uplink data) and outputs the modulated data signal to DFT section 211.
  • the DFT unit 211 converts the data signal input from the modulation unit 210 into the frequency domain, and outputs a plurality of frequency components obtained to the mapping unit 212.
  • the mapping unit 212 maps the frequency component corresponding to the data signal among the plurality of frequency components input from the DFT unit 211 to the PUSCH according to the uplink resource allocation information input from the PDCCH receiving unit 207. That is, mapping section 212 maps uplink data (uplink data signal) to PUSCH based on uplink resource allocation information addressed to the own apparatus allocated to any of a plurality of DCI allocation area candidates. Thereby, uplink data (uplink data signal) is transmitted. Further, mapping section 212 identifies the PUCCH according to the CCE number input from PDCCH receiving section 207. Then, mapping section 212 maps the ACK / NACK signal input from modulation section 209 to the specified PUCCH.
  • the IFFT unit 213 converts a plurality of frequency components mapped to the PUSCH into a time domain waveform, and the CP adding unit 214 adds a CP to the time domain waveform.
  • the transmission RF unit 215 is configured to be able to change the transmission band.
  • the transmission RF unit 215 sets the transmission band based on the band information received from the setting information reception unit 206. Then, the transmission RF unit 215 performs transmission radio processing (up-conversion, digital analog (D / A) conversion, etc.) on the signal to which the CP is added, and transmits the signal via the antenna 201.
  • transmission radio processing up-conversion, digital analog (D / A) conversion, etc.
  • the slot 0 area becomes tight.
  • UL grant is assigned only to the slot 1 region in the R-PDCCH region (see, for example, FIG. 2B)
  • data is assigned to discontinuous resources in the slot 1 region, and the DL grant information amount (control) Information amount) increases, and as a result, the slot 0 area becomes tight.
  • search space setting section 103 has a DCI size (a DCI format size corresponding to the transmission mode set in terminal 200) of DL ⁇ grant (downlink resource allocation information) set for a certain terminal 200.
  • DCI size of UL grant uplink resource allocation information
  • the search space is shared between the DL grant and UL grant.
  • the search space setting unit 103 is described above.
  • the DL grant search space is set in the slot 0 area
  • the UL grant search space is set in the slot 1 area (that is, the search space is not shared).
  • the DL search space is set in the slot 0 area of the R-PDCCH area. That is, by sharing a search space between DL grant and UL grant of the same DCI size, the search space of the DL grant is configured in the search space of UL grant having the same DCI size as the DL grant. At least a DCI allocation region candidate (CCE) is included. That is, part of UL grants set in a certain terminal 200 is collected in the slot 0 area.
  • CCE DCI allocation region candidate
  • the ratio of UL grant in the slot 1 region is reduced compared to the case where all UL grants are assigned to the slot 1 region (for example, FIG. 2B).
  • the existing free space is reduced. That is, as compared with the case where all UL grants are assigned to the slot 1 area, more continuous areas can be secured in the slot 1 area as data assignable areas (empty areas). Therefore, it is possible to suppress an increase in the information amount (control information amount) of DL grant for notification of data allocation, and as a result, it is possible to suppress the tightness of the slot 0 area.
  • the present inventors depending on the ratio of ULrantgrant in the slot 0 region and the proportion of UL ⁇ ⁇ grant in the slot 1 region, imposes a strain on the slot 0 region due to the allocation of the UL grant to the slot 0 region, and We paid attention to the fact that it is possible to suppress both of the tightness of the slot area 0 due to discontinuous data allocation to the slot 1 area (increase in the information amount of DL grant).
  • the asterisk shown in FIG. 10 indicates that the UL ratio is the optimum ratio in the slot 0 area and the slot 1 area.
  • tail biting convolutional coding is applied in channel coding (for example, see Table 5.1.3-2 of Non-Patent Document 2).
  • the number of output bits of convolutional coding differs depending on the number of input bits (value depending on the DCI size) to an encoder that performs convolutional coding. Therefore, when decoding the convolutionally encoded DCI at the terminal, it is necessary to perform a decoding process according to the number of input bits to the decoder (that is, the number of output bits of the encoder).
  • the decoding process is performed by software, it is necessary to vary the number of decoding process loops according to the number of input bits to the decoder (a value depending on the DCI size).
  • the decoding process is performed by hardware, it is necessary to change the number of times data to be input to the decoder is read from the memory according to the number of input bits to the decoder (a value depending on the DCI size). is there.
  • FIG. 11 a case where a search space (shared SS) composed of six CCEs is shared between DL grant and UL grant will be described.
  • the terminal starts decoding (blind decoding) in order from the leftmost CCE among the six CCEs constituting the search space.
  • DL grant is assigned to the second CCE from the left end
  • UL grant is assigned to the fifth CCE from the left end.
  • the DCI sizes of DL grant and UL grant are different.
  • the number of decoding processing loops x times (a value depending on the DCI size of DL grant) corresponding to the DCI size of DL grant is set.
  • a terminal performs a decoding process in an order from the left end of CCE which comprises shared search space.
  • the terminal detects DL grant by demasking the CRC with the terminal ID of its own terminal with respect to the decoding result obtained by the second decoding process (decoding process for the second CCE from the left end). Is done.
  • the decoding process for UL grant when the decoding process for UL grant is started, the number y of loops of decoding processing corresponding to the UL grant DCI size (a value depending on the DCI size of UL grant; a value different from x) is reset. And a terminal performs a decoding process in an order from the left end of CCE which comprises shared search space. In FIG. 11, the terminal performs the fourth decoding process (decoding process for the fifth CCE from the left end. In the example illustrated in FIG. 11, DL grant has already been detected in the second CCE from the left end, and the second CCE from the left end.
  • the ULCCgrant is detected by demasking the CRC with the terminal ID of its own terminal with respect to the decoding result obtained in order to eliminate the decoding process in the CCE.
  • the DCI sizes of DL grant and UL grant are different, it is necessary to detect each grant by changing the decoding process (here, changing the number of loops of the decoding process by software).
  • an identification bit (for example, flag for format0 / 1A differentiation bit) that can be identified as DL grant / UL grant is added to DL grant and UL grant having the same DCI size. That is, the terminal can determine whether the grant is DL grant or UL grant by determining the identification bit added to the detected grant.
  • the number of decoding processing loops z times (a value depending on the DCI size of DL grant and UL grant) corresponding to the DCI size of DL grant and UL grant having the same DCI size is set.
  • a terminal performs a decoding process in an order from the left end of CCE which comprises shared search space.
  • the terminal demasks the CRC with the terminal ID of its own terminal for the decoding result obtained by the second decoding process (decoding process for the second CCE from the left end), Based on this, it is determined that DL grant has been detected.
  • the third and subsequent decoding processes in the decoder (decoding process for the third and subsequent CCEs from the left end) are continued.
  • FIG. 11 the third and subsequent decoding processes in the decoder
  • the terminal demasks the CRC with the terminal ID of its own terminal with respect to the decoding result obtained by the fifth decoding process (decoding process for the fifth CCE from the left end), and further identifies It is determined that UL ⁇ ⁇ ⁇ grant is detected based on the bit. In this way, when the DL ⁇ grant and UL ⁇ ⁇ grant DCI sizes are the same, without changing the decoding process (here, the number of loops of the decoding process by software is the same), both DL grant and UL grant are changed. Can be detected.
  • the decoding process can be shared between DL grant and UL grant. Therefore, it is possible to reduce the number of times of blind decoding at terminal 200 as compared with the case where blind decoding is performed for each search space individually set in DL grant and UL grant.
  • the degree of reduction in the number of times of blind decoding at terminal 200 differs depending on the method of sharing the DL grant search space and the UL grant search space (for example, the degree of duplication of both search spaces). For example, if the search spaces of both DL grant and UL grant do not overlap, the number of times of blind decoding does not change depending on whether it is shared or not shared.
  • the search space of both DL grant and UL grant overlaps, the number of times of blind decoding in the case of sharing can be further reduced as compared to the case of not sharing.
  • the number of times of blind decoding at the terminal can be reduced.
  • search space setting examples 1 to 4 in the search space setting unit 103 will be described.
  • search space setting section 103 When only the R-PDCCH region is set as the DCI transmission region for terminal 200, as shown in FIG. 12A, search space setting section 103 first sets the search space for DL grant to the slot 0 region, The UL grant search space is set in the slot 1 area (for example, normal search space setting based on the terminal ID of the terminal 200).
  • the search space setting unit 103 based on the transmission mode input from the transmission mode setting unit 132, is the DCI DCI size assigned to a certain terminal 200 (the size of the DCI format corresponding to the transmission mode). Is identified.
  • the search space setting unit 103 determines that DL grant (downlink resource allocation information) and UL grant (uplink resource allocation information) having the same DCI size are assigned to a certain terminal 200, Reset search space for UL grant to slot 0 area. For example, in FIG. 12A, it is assumed that DL grant 10 and UL grant 11 assigned to a certain terminal 200 have the same DCI size. In this case, the search space setting unit 103 resets the UL 11 grant space to the slot 0 area (not shown).
  • the search space setting unit 103 sets the UL grant search space reset in the slot 0 area and the DL grant search space having the same DCI size as the UL grant to the UL grant and the DL grant. Share between them.
  • the search space setting unit 103 is configured to include a DL grant 10 search space and a reset UL grant 11 search space (not shown) in the slot 0 area. Set search space (shared SS).
  • the search space setting unit 103 also sets slot 0 for other DL grants and UL grants having the same DCI size (for example, DL grant 20 and UL grant 21 having the same DCI size in FIGS. 12A and 12B). Share search space with region (not shown).
  • the search space setting unit 103 generates search space information indicating the information of the search space that has been reset and shared, and notifies the terminal 200 via the antenna 113.
  • the allocation unit 106 allocates DCI including the same size DL grant or UL grant to the CCE (DCI allocation region candidate) in the shared search space.
  • the base station 100 sets this empty area (a resource area other than the resource area to which the UL grant is assigned) as a PDSCH area for transmitting data. That is, the control unit 102 determines a downlink resource to which downlink data addressed to the terminal 200 is allocated based on the search space setting in the search space setting unit 103 (not shown). At this time, as shown in FIG. 12B, control section 102 can assign downlink data addressed to terminal 200 to a continuous area in the slot 1 area of the R-PDCCH area as compared to FIG. 12A. Therefore, it is possible to suppress an increase in the information amount of DL grant (DL grant 20 in FIG. 12B) indicating the resource assignment result of downlink data assigned to the slot 1 region of the R-PDCCH region.
  • DL grant DL grant 20 in FIG. 12B
  • PDCCH receiving section 207 of terminal 200 includes an R-PDCCH region as a search space region indicated in the search space region information notified from base station 100, and also includes a DL grant search space region and a UL grant search space.
  • a shared search space is indicated as an area, the shared search space is blind-decoded (monitored) to detect DL grant and UL grant addressed to the terminal itself.
  • the PDCCH receiving unit 207 performs the same decoding process on DL grant and UL grant, and determines an identification bit (for example, flag for format0 / 1A differentiation bit) included in the decoding result.
  • an identification bit for example, flag for format0 / 1A differentiation bit
  • the base station 100 resets the search space for a specific UL grant having the same DCI size as a specific DL grant assigned to a certain terminal 200 in the slot 0 region, and further, the slot 0 region. Share the search space for both DL grant and UL grant.
  • an empty area can be secured by the UL grant having the same DCI size as the DL grant (UL grant aggregated in the slot 0 region).
  • the free areas that existed discontinuously are continuous as shown in FIG. 12B. It can be secured as a free area.
  • data can be allocated to continuous resource areas in the slot 1 area, and the resource utilization efficiency of the slot 1 area can be improved.
  • the slot 1 area more continuous areas can be secured as areas where data can be allocated (empty areas), so an increase in the amount of DL grant information (control information) for notifying data allocation is suppressed. As a result, tightness of the slot 0 area can be suppressed. Therefore, the resource utilization efficiency of the slot 0 area can be improved and the system throughput can be improved.
  • FIG. 13 shows a comparison of DL grant information amount for notification of data allocation in the slot 1 area.
  • the number of UEs allocated to the continuous resource region (the number of UEs allocated to the continuous resource) is set to 5
  • the discontinuous resource region The number of UEs allocated to (number of UEs allocated to discontinuous resources) is set to 5.
  • the number of bits necessary for continuous resource allocation is 13 bits
  • the UL grant ratio in the slot 0 area can be kept low. That is, by restricting the tightness of the slot 0 area due to the UL grant assignment, it is possible to keep the DL grant assignment from being restricted to a low level. Therefore, the resource utilization efficiency of the slot 0 area can be improved and the system throughput can be improved.
  • terminal 200 can also share blind decoding in the shared search space. That is, terminal 200 can reduce the number of times of blind decoding. If the search space shared between DL ⁇ grant and UL grant having the same DCI size is larger than the search space of each grant, the allocation of each grant is not increased without increasing the number of times of blind decoding. The degree of freedom can be increased.
  • search space setting section 103 When only the R-PDCCH region is set as the DCI transmission region for terminal 200 individually, search space setting section 103 first sets the DL grant search space to the slot 0 region, as shown in FIG. 14A.
  • the UL grant search space is set in the slot 1 area (for example, normal search space setting based on the terminal ID of the terminal 200).
  • the search space setting unit 103 specifies the DCI size of DCI allocated to a certain terminal 200 based on the transmission mode input from the transmission mode setting unit 132.
  • the search space for the DL grant and the search space for the UL grant Is shared between the DL grant and the UL grant.
  • FIG. 14A it is assumed that DL grant 10 and UL grant 11 assigned to a certain terminal 200 have the same DCI size.
  • the search space setting unit 103 performs a shared search space (shared SS) composed of the search space of DL grant 10 shown in FIG. 14A and the search space of UL grant 11 shown in FIG. ) Is set.
  • the search space setting unit 103 also searches for other DL ⁇ ⁇ ⁇ ⁇ grants and UL grants having the same DCI size (for example, DL grant 20 and UL grant 21 having the same DCI size in FIGS. 14A and 14B). (Not shown).
  • the allocation unit 106 allocates DCI including the same size DL grant or UL grant to the CCE (DCI allocation region candidate) in the shared search space.
  • the shared search space (shared SS) is composed of a search space of DL grant 10 in the slot 0 area and a search space of UL grant 11 in the slot 1 area.
  • the assigning unit 106 preferentially assigns DCI including DL grant 10 and UL grant 11 to the slot 0 area (search space of DL grant 10) in the shared search space.
  • the PDCCH receiving unit 207 of the terminal 200 determines whether or not DL search grant and UL search grant having the same DCI size are included in the search space region information based on the transmission mode information notified from the base station 100. To do.
  • the search space region information includes DL grant and UL grant having the same DCI size
  • the PDCCH reception unit 207 includes a search space region composed of the search spaces of the DL grant and the UL grant. Is recognized as a shared search space. Then, the PDCCH receiving unit 207 performs blind decoding (monitoring) on the shared search space, and detects DL grant and UL grant addressed to the terminal itself.
  • the PDCCH receiving unit 207 performs the same decoding process on DL grant and UL grant, and determines an identification bit (for example, flag for format0 / 1A differentiation bit) included in the decoding result. In this way, DL grant and UL grant are detected.
  • an identification bit for example, flag for format0 / 1A differentiation bit
  • the base station 100 specifies a search space for a specific UL ⁇ grant having the same DCI size as a specific DL grant allocated to a certain terminal 200, and a search space of the specific DL grant as a specific Share between DL grant and specific UL grant. Then, the base station 100 preferentially assigns a UL grant having the same DCI size as the DL grant DCI size to the slot 0 area (that is, the search space of the DL grant).
  • the slot 1 area it is possible to secure more continuous resource areas as areas where data can be allocated (empty areas).
  • data can be allocated to continuous resource areas, and the resource utilization efficiency of the slot area 1 can be improved.
  • terminal 200 can also share blind decoding in the shared search space, It is possible to reduce the number of times of blind decoding. If the search space shared between DL grant and UL grant having the same DCI size is larger than the search space of each grant, the number of times of blind decoding is increased as in setting example 1. In addition, it becomes possible to increase the degree of freedom of allocation of each grant.
  • the base station 100 uses the search space (FIG. 14A) set by a normal search space setting method (for example, a method calculated based on the terminal ID of the terminal 200) as it is. Therefore, unlike setting example 1 (FIG. 12B, in the case where the UL search space is reset), there is no need to notify that the shared search space has been set. That is, in setting example 1, it is necessary to newly define a shared search space (reset search space) and notify terminal 200, whereas in setting example 2, terminal 200 has the same DCI size. Based on the DL ⁇ ⁇ ⁇ grant and UL grant search spaces, the shared search space can be specified. Therefore, compared to setting example 1, setting example 2 can suppress an increase in the amount of signaling for notifying the setting of the shared search space.
  • a normal search space setting method for example, a method calculated based on the terminal ID of the terminal 200
  • search space setting section 103 When only the R-PDCCH region is set as the DCI transmission region for terminal 200, as shown in FIG. 15A, search space setting section 103 first sets the search space for DL grant to the slot 0 region, The UL grant search space is set in the slot 1 area (for example, normal search space setting based on the terminal ID of the terminal 200).
  • the search space setting unit 103 specifies the DCI size of DCI allocated to a certain terminal 200 based on the transmission mode input from the transmission mode setting unit 132.
  • the search space setting unit 103 determines that a DL grant and a UL grant having the same DCI size are assigned to a certain terminal 200
  • the search space setting unit 103 sets the search space for the UL grant to the search space for the DL grant. Change to the same area as.
  • the search space setting unit 103 sets the search space for the DL grant set in the slot 0 area as the search space for the UL grant. That is, the search space setting unit 103 shares search spaces for DL grant and UL grant having the same DCI size in the slot 0 area.
  • the search space setting unit 103 changes the search space of UL ⁇ grant 11 to the same area as the search space of DL grant 10, as shown in FIG. 15B. That is, as shown in FIG. 15B, the search space setting unit 103 sets the search space of DL10grant 10 shown in FIG. 15A as a shared search space (shared SS) of DL grant 10 and UL grant 11 having the same DCI size. To do.
  • the search space setting unit 103 also searches for other DL ⁇ ⁇ ⁇ ⁇ grants and UL grants having the same DCI size (for example, DL grant 20 and UL grant 21 having the same DCI size in FIGS. 15A and 15B). (Not shown).
  • the allocation unit 106 allocates DCI including the same size DL grant or UL grant to the CCE (DCI allocation region candidate) in the shared search space.
  • UL grants (UL grant 11 and UL grant 21) having the same DCI size as the DL grant DCI size are collected in the slot 0 area. Therefore, as in setting example 1 (FIG. 12B), in the slot 1 area, more continuous empty areas (empty) can be secured as compared to FIG. 15A. Then, as in setting example 1, base station 100 sets this free area (resource area other than the resource area to which UL grant is assigned) as the PDSCH area for transmitting data.
  • the PDCCH receiving unit 207 of the terminal 200 determines whether or not DL search grant and UL search grant having the same DCI size are included in the search space region information based on the transmission mode information notified from the base station 100. To do.
  • the search space region information includes DL grant and UL grant having the same DCI size
  • the PDCCH receiving unit 207 uses the search space of both grants as the search space of both grants (shared search space).
  • the PDCCH receiving unit 207 blind-decodes (monitors) the same search space (shared search space) for DL ⁇ ⁇ ⁇ ⁇ grant and UL grant having the same size, and performs DL ⁇ grant and UL grant addressed to the terminal itself. To detect.
  • the PDCCH receiving unit 207 performs the same decoding process on the DL grant and the UL grant, and adds an identification bit (for example, flag for format0 / 1A differentiation bit) included in the decoding result. By judging, DL grant and UL grant are detected.
  • an identification bit for example, flag for format0 / 1A differentiation bit
  • the base station 100 sets the search space for the DL grant as the search space for the specific UL grant having the same DCI size as the specific DL grant assigned to a certain terminal 200, and thereby DL Share grant search space and UL grant search space.
  • the search space for the DL grant as the search space for the specific UL grant having the same DCI size as the specific DL grant assigned to a certain terminal 200, and thereby DL Share grant search space and UL grant search space.
  • data can be allocated to continuous resource areas, and the resource utilization efficiency of the slot 1 area can be improved.
  • similarly to setting example 1 it is possible to suppress an increase in the amount of information of DL grant for notification of data allocation in the slot 1 area, and it is possible to suppress the tightness of the slot 0 area.
  • terminal 200 can also share blind decoding in the shared search space, It is possible to reduce the number of times of blind decoding. If the search space shared between DL grant and UL grant having the same DCI size is larger than the search space of each grant, the number of times of blind decoding is increased as in setting example 1. In addition, it becomes possible to increase the degree of freedom of allocation of each grant.
  • the base station 100 uses the search space (FIG. 15A) set by a normal search space setting method (for example, a method calculated based on the terminal ID of the terminal 200) as it is. That is, in setting example 3, terminal 200 can specify a shared search space (that is, a search space for the DL grant) based on each DL grant and UL grant search space having the same DCI size. Therefore, compared with setting example 1, setting example 3 can suppress an increase in the amount of signaling for notifying the setting of the shared search space.
  • a normal search space setting method for example, a method calculated based on the terminal ID of the terminal 200
  • search space setting section 103 When only the R-PDCCH region is set as the DCI transmission region for terminal 200 individually, search space setting section 103 first sets the search space for DL grant to the slot 0 region, as shown in FIG.
  • the UL grant search space is set in the slot 1 area (for example, normal search space setting based on the terminal ID of the terminal 200).
  • the search space setting unit 103 specifies the DCI size of DCI allocated to a certain terminal 200 based on the transmission mode input from the transmission mode setting unit 132.
  • the search space setting unit 103 determines that DL grant and UL grant of the same DCI size are assigned to a certain terminal 200, the contents (for example, MCS and DCI format types) indicated in the DL grant are determined. Etc.), the amount of resources (transport block size (Transport block Size: TBS)) to which downlink data is allocated in the PDSCH region is calculated.
  • TBS Transport block Size
  • the search space setting unit 103 keeps the DL grant search space as the normal search space setting, and sets the UL grant search space to , DL ⁇ ⁇ ⁇ ⁇ grant search space and UL grant search space shall be shared.
  • TBS is less than a preset threshold value (when downlink data is small)
  • the search space setting unit 103 sets the DL grant search space and UL grant search space as DL ⁇ grant search space and UL grant search.
  • a search space configured to share a space.
  • search space setting section 103 may change the FIG.
  • the search space of DL grant 10 shown in Fig. 16 is used as it is as the search space of DL grant 10 (region surrounded by a dotted line shown in Fig. 17A).
  • the search space setting unit 103 sets the search space of UL grant 11 to the search space of DL grant 10 shown in FIG. 16 and the search of UL16grant 11 as in setting example 2 (FIG. 14B).
  • a search space (shared search space) composed of spaces is set (region surrounded by a solid line in FIG. 17A).
  • the assigning unit 106 assigns DCI including DL grant among the DLEgrant and UL grant having the same size to the CCE in the DL grant search space, and assigns DCI including UL grant to the CCE in the shared search space. .
  • search space setting section 103 is as shown in FIG. 17B.
  • the search space of DL grant 10 and UL grant 11 is set to the search space composed of the search space of DL grant 10 and the search space of UL grant 11 shown in Fig. 16 (area surrounded by the solid line shown in Fig. 17B). .
  • the assigning unit 106 assigns DCI including DL grant or UL grant among DL grant and UL grant of the same size to the CCE in the shared search space.
  • the search space setting unit 103 among DL grant and UL grant having the same DCI size, does not depend on the size of TBS for UL grant, and in the slot 0 area, as in setting examples 1 to 3.
  • a shared search space (shared SS) including at least a CCE (DCI allocation region candidate) constituting the DL grant search space is used.
  • the search space setting unit 103 selects only the slot 0 area as the search space or sets the slot 0 for DL grant of DL grant and UL grant having the same DCI size, depending on the size of the TBS. Switching between the area and the slot 1 area as a search space is switched.
  • the base station 100 determines that the TBS is small (when the downlink data resource amount is small), the base station 100 shares the DL grant search space with the UL grant search space, and the slot 0 area and the slot 1 Set in the area.
  • the base station 100 determines that the TBS is large (when the amount of downlink data resources is large), the DL grant search space is not shared with the UL grant search space, and only in the slot 0 area. Set to.
  • the base station 100 can improve the degree of freedom of DL allocation while avoiding the decoding delay in the terminal 200. That is, blocking probability (probability that CCE cannot be allocated to PDCCH) can be reduced while avoiding decoding delay in terminal 200.
  • a continuous data area from slot 0 to slot 1 can be created as shown in FIG. Efficiency can be improved.
  • UL grant (UL grant 11) having the same DCI size as the DL grant DCI size can be aggregated in the slot 0 area. Therefore, as in setting example 1 (FIG. 12B), data can be allocated to continuous resource areas in the slot 1 area, and resource utilization efficiency in the slot 1 area can be improved. Further, similarly to setting example 1, it is possible to suppress an increase in the amount of information of DL grant for notification of data allocation in the slot 1 area, and it is possible to suppress the tightness of the slot 0 area. In addition, it is possible to aggregate only a part (that is, UL grant having the same size as the DL grant assigned to the terminal 200) in the slot 0 area among the UL grants set in the terminal 200. Similar to Example 1, it is possible to suppress the tightness of the slot 0 area due to the allocation of UL grant. Therefore, the resource utilization efficiency of the slot 0 area can be improved and the system throughput can be improved.
  • terminal 200 can also share blind decoding in the shared search space, It is possible to reduce the number of times of blind decoding. Further, since only a part of UL assignment granted to terminal 200 (that is, UL grant having the same size as DL assignment granted to terminal 200) is aggregated in the slot 0 area, the same as in setting example 1 , The tightness of the slot 0 area due to the assignment of UL grant can be suppressed. Therefore, the resource utilization efficiency of the slot 0 area can be improved and the system throughput can be improved.
  • the base station 100 uses the search space (FIG. 16) set by a normal search space setting method (for example, a method calculated based on the terminal ID of the terminal 200) as it is. That is, in setting example 4, terminal 200 can specify a shared search space based on each search space of DL grant and UL grant having the same DCI size. Therefore, compared to setting example 1, setting example 4 can suppress an increase in signaling amount for notifying the setting of the shared search space.
  • a normal search space setting method for example, a method calculated based on the terminal ID of the terminal 200
  • the DCI format may be used as a criterion for determining whether or not to share the DL search space with the UL search space. That is, when a DCI format (for example, DCI 2) indicating spatial multiplexing that can be estimated to have a large amount of processing is set, the base station 100 sets the DL grant search space only in the slot 0 area, and performs processing. When a DCI format (for example, DCI 1 or the like) instructing one-antenna transmission / reception that can be estimated to be small is set, the DL search space is set as a slot 0 area and a slot 1 area.
  • a DCI format for example, DCI 1 or the like
  • the search space setting examples 1 to 4 in the search space setting unit 103 have been described above.
  • the search space setting unit 103 performs a plurality of CCEs (DCI allocations) for each DL grant (downlink resource allocation information) and UL grant (uplink resource allocation information) for one terminal 200.
  • a search space having a region candidate) is set to an R-PDCCH mapped to the same resource region as a resource region (PDSCH region) to which data for each terminal 200 is allocated.
  • the assigning unit 106 assigns DL grant (downlink resource assignment information) or UL grant (uplink resource assignment information) to the CCEs in the search space corresponding to each.
  • the R-PDCCH is composed of slot 0 and slot 1
  • the search space for a specific UL ⁇ ⁇ ⁇ grant having the same DCI size as the specific DL grant is a search for the specific DL grant set in the slot 0.
  • At least the CCEs that make up the space are included.
  • the resource utilization efficiency of the entire R-PDCCH region is improved and the system throughput is improved. Can be made.
  • terminal 200 when terminal 200 blind-decodes a search space corresponding to DL grant and UL grant having the same DCI size, DL 200 grant and UL grant perform a common decoding process. Thereby, the number of times of blind decoding in terminal 200 can be reduced.
  • C-RNTI Cell-Radio Network Temporary Identifier
  • the CCE described in the above embodiment is a logical resource, and when the CCE is allocated to an actual physical time / frequency resource, the CCE is distributed over the entire band in the unit band. Be placed. Furthermore, as long as the CCE as a logical resource is divided for each unit band, the arrangement of CCEs in actual physical time / frequency resources is distributed over the entire system band (that is, all unit bands). It may be arranged.
  • the terminal is sometimes called UE, and the base station is sometimes called Node B or BS (Base Station). Also, the terminal ID may be called UE-ID.
  • each functional block used in the description of the above embodiment is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. Although referred to as LSI here, it may be referred to as IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
  • the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
  • An FPGA Field Programmable Gate Array
  • a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
  • the present invention is useful for mobile communication systems.
  • DESCRIPTION OF SYMBOLS 100 Base station 101 Setting part 102 Control part 103 Search space setting part 104 PDCCH production

Landscapes

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

Abstract

La présente invention porte sur une station de base qui peut améliorer l'efficacité d'utilisation de ressources de façon à améliorer le débit du système dans un situation de mappage vers une zone R-PDCCH d'un DCI dirigé vers un terminal connecté à la station de base. Une station de base utilise un canal de commande, qui comprend une première et une deuxième zones, de façon à transmettre des informations d'attribution vers l'aval et des informations d'attribution vers l'amont dirigées toutes les deux vers un terminal. La station de base comprend une unité d'établissement d'espace de recherche (103) et une unité d'attribution (106). L'unité d'établissement d'espace de recherche (103) est un moyen d'établir, dans le canal de commande, un espace de recherche pour chacune des informations d'attribution vers l'aval et des informations d'attribution vers l'amont. L'espace de recherche comprend un premier espace de recherche établi dans la deuxième zone et dirigé vers les informations d'attribution vers l'amont et il comprend également un espace de recherche partagé établi au moins dans la première zone et dirigé à la fois vers les informations d'attribution vers l'aval et les informations d'attribution vers l'amont. L'unité d'attribution (106) attribue à l'espace de recherche partagé des informations d'attribution vers l'amont particulières ayant la même taille que des informations d'attribution vers l'aval particulières, et il attribue également, au premier espace de recherche, les informations d'attribution vers l'amont autres que les informations d'attribution vers l'amont particulières.
PCT/JP2011/005015 2010-09-21 2011-09-07 Station de base, terminal, procédé d'émission et procédé de réception WO2012039102A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010210871 2010-09-21
JP2010-210871 2010-09-21

Publications (1)

Publication Number Publication Date
WO2012039102A1 true WO2012039102A1 (fr) 2012-03-29

Family

ID=45873606

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/005015 WO2012039102A1 (fr) 2010-09-21 2011-09-07 Station de base, terminal, procédé d'émission et procédé de réception

Country Status (1)

Country Link
WO (1) WO2012039102A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013168794A1 (fr) * 2012-05-11 2013-11-14 株式会社エヌ・ティ・ティ・ドコモ Procédé de décodage aveugle, station de base sans fil, terminal utilisateur et système de communication sans fil
CN104685950A (zh) * 2012-09-28 2015-06-03 株式会社Ntt都科摩 无线基站、用户终端、无线通信系统以及无线通信方法
CN111357349A (zh) * 2017-11-17 2020-06-30 株式会社Ntt都科摩 用户终端以及无线通信方法
CN112567844A (zh) * 2018-06-12 2021-03-26 株式会社Ntt都科摩 用户终端以及无线通信方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
SAMSUNG: "R-PDCCH search space design", 3GPP TSG RAN WG1 MEETING #62, R1-104624, 27 August 2010 (2010-08-27), pages 1 - 3 *
ZTE: "The blind decoding of R-PDCCH", 3GPP TSG- RAN WG1 #61BIS, R1-103580, 2 July 2010 (2010-07-02), pages ALL PAGES *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013168794A1 (fr) * 2012-05-11 2013-11-14 株式会社エヌ・ティ・ティ・ドコモ Procédé de décodage aveugle, station de base sans fil, terminal utilisateur et système de communication sans fil
CN104285490A (zh) * 2012-05-11 2015-01-14 株式会社Ntt都科摩 盲解码方法、无线基站、用户终端以及无线通信系统
US9763240B2 (en) 2012-05-11 2017-09-12 Ntt Docomo, Inc. Blind decoding method, radio base station, user terminal and radio communication system
CN104285490B (zh) * 2012-05-11 2019-04-16 株式会社Ntt都科摩 盲解码方法、无线基站、用户终端以及无线通信系统
CN104685950A (zh) * 2012-09-28 2015-06-03 株式会社Ntt都科摩 无线基站、用户终端、无线通信系统以及无线通信方法
CN104685950B (zh) * 2012-09-28 2016-12-28 株式会社Ntt都科摩 无线基站、用户终端、无线通信系统以及无线通信方法
CN111357349A (zh) * 2017-11-17 2020-06-30 株式会社Ntt都科摩 用户终端以及无线通信方法
CN112567844A (zh) * 2018-06-12 2021-03-26 株式会社Ntt都科摩 用户终端以及无线通信方法
CN112567844B (zh) * 2018-06-12 2024-02-13 株式会社Ntt都科摩 用户终端以及无线通信方法

Similar Documents

Publication Publication Date Title
US11917640B2 (en) Communication apparatus and communication method for receiving control information over a search space
US11490377B2 (en) Communication apparatus and communication reception method
JP6410197B2 (ja) 通信装置、通信方法、及び集積回路
US11696268B2 (en) Integrated circuit
JP6000275B2 (ja) 端末装置、基地局装置、送信方法および受信方法
WO2012029245A1 (fr) Station de base et procédé de transmission d'information de commande
WO2011114743A1 (fr) Station de base et procédé de transmission
WO2012039102A1 (fr) Station de base, terminal, procédé d'émission et procédé de réception

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11826553

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11826553

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP