WO2010093006A1 - Système de communication sans fil, dispositif de station de base, dispositif de station mobile, procédé de transmission sans fil, procédé de réception sans fil et programme - Google Patents

Système de communication sans fil, dispositif de station de base, dispositif de station mobile, procédé de transmission sans fil, procédé de réception sans fil et programme Download PDF

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Publication number
WO2010093006A1
WO2010093006A1 PCT/JP2010/052036 JP2010052036W WO2010093006A1 WO 2010093006 A1 WO2010093006 A1 WO 2010093006A1 JP 2010052036 W JP2010052036 W JP 2010052036W WO 2010093006 A1 WO2010093006 A1 WO 2010093006A1
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WIPO (PCT)
Prior art keywords
control information
bits
information
mobile station
station apparatus
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PCT/JP2010/052036
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English (en)
Japanese (ja)
Inventor
鈴木翔一
中嶋大一郎
山田昇平
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シャープ株式会社
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Publication of WO2010093006A1 publication Critical patent/WO2010093006A1/fr

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    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0079—Formats for control data
    • 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
    • H04L5/003—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
    • 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
    • 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

Definitions

  • the present invention relates to a radio communication system, a base station apparatus, a mobile station apparatus, a radio transmission method, a radio reception method, and a program.
  • LTE Long Term Evolution
  • EUTRA Evolved Universal Terrestrial Radio Access
  • LTE- a Long Term Evolution-Advanced
  • 3GPP Third Generation Partnership Project
  • an orthogonal frequency division multiplexing (OFDM) system that is multicarrier transmission is used as a downlink.
  • OFDM orthogonal frequency division multiplexing
  • the uplink a single carrier communication scheme of Discrete Fourier Transform (DFT) -Spread OFDM scheme which is single carrier transmission is used.
  • DFT Discrete Fourier Transform
  • the OFDM scheme is in the downlink, and in the uplink, in addition to the DFT-Spread OFDM scheme, the multicarrier communication scheme OFDM scheme, the Clustered DFT-Spread OFDM scheme, and the N * DFT-Spread OFDM scheme. It has been proposed to introduce a method.
  • the downlink of radio communication from a base station apparatus to a mobile station apparatus includes a broadcast channel (Physical Broadcast Channel; PBCH), a downlink control channel (Physical Downlink Control Channel; PDCCH), and a downlink shared channel (Physical Downlink Shared).
  • PBCH Physical Broadcast Channel
  • PDCCH Physical Downlink Control Channel
  • PDSCH downlink shared channel
  • PMCH Physical Multicast Channel
  • PMCH Physical Multicast Channel
  • control format indicator channel Physical Control Format Indicator Channel: PCFICH
  • HARQ indicator channel Physical Hybrid ARQ Indicator Channel: PHICH
  • PRACH Physical Random Access Channel
  • LTE-A is considered compatible with LTE, that is, LTE-A base station apparatus communicates with both LTE-A and LTE mobile station apparatuses simultaneously. Therefore, it is required to use the same channel structure as LTE.
  • the frequency band used in the conventional mobile communication system is continuous, a plurality of continuous / discontinuous frequency bands (hereinafter referred to as “Carrier Component (CC)” or “Component Carrier (CC) : “Component Carrier”) is used in combination to operate as one frequency band (broadband frequency band) (also called spectrum aggregation, carrier aggregation, frequency aggregation, etc.) has been proposed.
  • the frequency band used for downlink communication and the frequency band used for uplink communication are different. It has also been proposed to have a frequency bandwidth. (See Non-Patent Document 2 below)
  • DL grant downlink grant
  • RA radio resource allocation
  • PDSCH downlink shared channel
  • PUSCH uplink shared channel
  • UL grant uplink grant that is control information including an information bit is transmitted using a downlink control channel (PDCCH).
  • an information bit (information ⁇ ⁇ bit) including an identifier for identifying a carrier element corresponding to the uplink grant and the downlink grant is included in the uplink grant and the downlink grant. It has been proposed that uplink grants and downlink grants addressed to the same mobile station apparatus are collectively transmitted on a downlink control channel (PDCCH) of one downlink carrier element (Non-patent Document 3 and Non-Patent Document below). Reference 4).
  • PDCH downlink control channel
  • the LTE uplink grant and downlink grant include modulation schemes for the uplink shared channel (PUSCH) and the downlink shared channel (PDSCH) in addition to information bits (information bits) indicating radio resource allocation (RA). scheme), information on coding scheme, information on HARQ, and the like. Note that the number of information bits (information bits) indicating radio resource allocation (RA) varies depending on the bandwidth of the carrier element corresponding to the uplink grant and the downlink grant.
  • the mobile station apparatus includes a 16-bit mobile station identifier (“Radio Network Temporary Identity”; “RNTI” or “User Equipment Identity”; uniquely identified in the base station device, which is included in the uplink grant and the downlink grant. Specified as “UE ID”).
  • the mobile station apparatus performs downlink control of one downlink carrier element.
  • PDCCH On the channel (PDCCH), uplink grants and downlink grants with various numbers of bits are monitored.
  • the uplink grant addressed to the own station device is determined depending on the success or failure of the decoding processing. It is determined whether or not a downlink grant is transmitted.
  • the mobile station device needs to perform different decoding processes, and the number of decoding processes of the mobile station device increases. Therefore, there is a problem that the processing load on the mobile station apparatus increases and the delay of the decoding process (from the reverse process of rate matching to error detection) increases.
  • the present invention provides a wireless communication system capable of reducing the number of times of decoding processing of a downlink control channel (PDCCH) of a mobile station apparatus, reducing processing load when monitoring the downlink control channel, and reducing delay of decoding processing.
  • the purpose is to provide.
  • the present invention performs processing to make the number of bits of the uplink grant and the downlink grant of various numbers of bits transmitted on the downlink control channel (PDCCH) of one downlink carrier element the same number of bits. is there.
  • PDCCH downlink control channel
  • the base station apparatus in a radio communication system having a plurality of mobile station apparatuses and base station apparatuses, includes information bits indicating allocation of radio resources addressed to the mobile station apparatus, and the same Compare the number of information bits of control information transmitted in each of the same formats addressed to the mobile station apparatus, set the number of information bits of control information in the same format to the same number of bits, and transmit the control information on the downlink control channel
  • the mobile station apparatus receives the control information through a downlink control channel, and the number of information bits of the control information transmitted in each of the control information of the same format addressed to the mobile station apparatus is the same number of bits.
  • a wireless communication system characterized by performing a decoding process.
  • the base station apparatus sets the number of information bits indicating the allocation of radio resources of the control information in the same format to the same number of bits, thereby transmitting information bits of control information transmitted in the same format addressed to the mobile station apparatus.
  • the number is the same number of bits.
  • the present invention provides a base station apparatus that performs radio communication with a plurality of mobile station apparatuses, wherein the base station apparatus includes an information bit indicating assignment of radio resources addressed to the mobile station apparatus, Comparing the number of information bits of control information transmitted in each of the same format, setting the number of information bits of control information in the same format to the same number of bits, and transmitting the control information on a downlink control channel, Base station apparatus.
  • the present invention provides a mobile station apparatus that performs radio communication with a base station apparatus, wherein the mobile station apparatus includes information bits indicating allocation of radio resources addressed to the mobile station apparatus, and each base station has the same format.
  • the control information transmitted by the device is received by the downlink control channel, the information bits of the control information transmitted in the same format are compared, and the information bits of the control information of the same format are the same number of bits.
  • the mobile station apparatus is characterized by performing a decoding process.
  • the present invention is also a communication method in a base station apparatus that performs radio communication with a plurality of mobile station apparatuses, the base station apparatus including information bits indicating allocation of radio resources addressed to the mobile station apparatus, and the same Comparing the number of information bits of control information transmitted in each of the same formats addressed to the mobile station apparatus, and setting the number of information bits of control information of the same format to the same number of bits; and downlink control the control information And transmitting on a channel.
  • the present invention is also a communication method in a mobile station apparatus that performs radio communication with a base station apparatus, wherein the mobile station apparatus includes information bits indicating allocation of radio resources addressed to the mobile station apparatus, and has the same format
  • the mobile station apparatus includes information bits indicating allocation of radio resources addressed to the mobile station apparatus, and has the same format
  • Each step of receiving control information transmitted by the base station apparatus on a downlink control channel is compared with the number of information bits of control information transmitted in each of the same format, and information bits of control information in the same format
  • a step of performing a decoding process assuming that the numbers are the same number of bits.
  • the base station apparatus includes an information bit indicating allocation of radio resources addressed to the mobile station apparatus, Compare the number of information bits of the control information transmitted in the same format addressed to the same mobile station device, the number of information bits with the largest number of bits as the payload size of the control information, the number of information bits of the control information is A bit insertion unit that inserts bits into the information bits until the same number of bits as the payload size and generates a payload, and a transmission processing unit that transmits control information of the payload size on a downlink control channel, The mobile station apparatus receives a reception processing unit that receives the control information through a downlink control channel, and a mobile station apparatus that is the same for the mobile station apparatus.
  • a wireless communication system comprising: a bit deletion unit; and a decoding unit that performs a decoding process on the assumption that the payload size of the control information is the number of bits obtained by the bit deletion unit.
  • the information bit of the maximum number of bits is the payload size (payload size), and by matching the number of bits of DCI format to the payload size, By reducing the number of decoding processes when the mobile station apparatus monitors the downlink control channel, the load can be reduced, and further the delay of the decoding process can be reduced.
  • DCI format downlink control information format
  • the bit insertion unit further compares the number of information bits transmitted in each of the control information of two or more formats addressed to the same mobile station apparatus, and determines the number of information bits having the largest number of bits as the two types of information bits.
  • the payload size of the control information in the above format is used, and the bit deletion unit further determines the number of information bits having the largest number of information bits in the control information in the two or more formats as the two or more formats.
  • the payload size of the control information is preferably set. Thereby, the decoding process can be further simplified.
  • the bit insertion unit inserts a bit into an area indicating an allocation of radio resources allocated to data addressed to the mobile station device included in the information bits of the control information, and the bit deletion unit performs the control It is preferable to delete the bit inserted in the area indicating the radio resource allocation included in the information bits of the information.
  • the present invention provides a base station apparatus that performs radio communication with a plurality of mobile station apparatuses, including information bits indicating allocation of radio resources addressed to the mobile station apparatus, and transmitted in the same format addressed to the same mobile station apparatus.
  • the information bits of the control information are compared, the information bit number having the largest number of bits is set as the payload size of the control information, and the information bits are set in the information bits until the information bit number of the control information is equal to the payload size.
  • a base station apparatus comprising: a bit insertion unit that inserts a bit; and a transmission processing unit that transmits control information of a payload size in which the bit is inserted in the bit insertion unit through a downlink control channel.
  • the base station apparatus may be the same as the control information including information bits indicating allocation of radio resources addressed to the mobile station apparatus.
  • the number of information bits of the control information transmitted in each of the control information of the same format addressed to the mobile station device is compared, the number of information bits having the largest number of bits is set as the payload size of the control information, and the control information information Until the number of bits becomes the same as the payload size, the mobile station apparatus receives the control information transmitted by inserting bits into the information bits.
  • the information bit number having the largest number of bits is the payload size of the control information
  • the control information A bit deletion unit that deletes the bits inserted in the payload of The mobile station apparatus may include a decoding unit that performs a decoding process on the assumption that the payload size of the control information is the number of bits obtained by the bit deletion unit.
  • a wireless transmission method for performing wireless communication with a plurality of mobile station devices the same information addressed to the same mobile station device, including information bits indicating assignment of radio resources addressed to the mobile station device
  • the number of information bits of control information transmitted in each format is compared, the number of information bits with the largest number of bits is set as the payload size of the control information, and the number of information bits of the control information is the same as the payload size
  • a wireless transmission method comprising the steps of: inserting a bit into the information bit; and transmitting the payload size control information on a downlink control channel.
  • the base station device transmits the control information transmitted in the same format of control information addressed to the same mobile station device. Compare the number of information bits, the number of information bits with the most number of bits as the payload size of the control information, until the number of information bits of the control information is the same as the payload size, insert bits into the information bits,
  • the wireless reception method for receiving the transmitted control information the number of information bits having the largest number of bits among the information bits of the control information transmitted in each of the control information of the same format addressed to the mobile station device.
  • the present invention may be a program for causing a computer to execute one of the wireless transmission methods described above, or a computer-readable record for recording the program.
  • the program may be acquired by a transmission medium such as the Internet.
  • the present invention it is possible to reduce the number of downlink control channel (PDCCH) decoding processes of the mobile station apparatus, reduce the processing load when monitoring the downlink control channel, and reduce the delay of the decoding process.
  • PDCH downlink control channel
  • Base station equipment Mobile station apparatus 11/51 Upper layer 11a / 51a Radio resource control unit 15/53 Control unit 15a Bit insertion unit 17/55 Reception antenna 21/57 Reception processing unit 23/61 Demultiplexing unit 25/63 Demodulation unit 27/65 Decoding unit 31/67 Encoding unit 35/71 Modulation unit 37/73 Multiplexing unit 41/75 Transmission processing unit 45/77 Transmission antenna 53a Bit deletion unit
  • the wireless communication system includes a base station device and a plurality of mobile station devices.
  • FIG. 1 is a diagram illustrating a schematic structure example of a channel in the present embodiment.
  • the base station apparatus 1 performs radio communication using the mobile station apparatuses 2a to 2c and a plurality of carrier elements.
  • the downlink of radio communication from the base station apparatus 1 to the mobile station apparatuses 2a to 2c of this embodiment is also referred to as a broadcast channel (PBCH) or a downlink pilot channel (or “downlink reference signal; Downlink Reference Signal”). ), A downlink control channel (PDCCH), and a downlink shared channel (PDSCH).
  • PBCH broadcast channel
  • PDCH downlink pilot channel
  • PDSCH downlink shared channel
  • the uplink of radio communication from the mobile station apparatus to the base station apparatus of the present embodiment includes an uplink pilot channel (or “uplink reference signal; also referred to as Uplink Reference Signal”), an uplink control channel (PUCCH). And an uplink shared channel (PUSCH).
  • uplink pilot channel or “uplink reference signal; also referred to as Uplink Reference Signal”
  • PUCCH uplink control channel
  • PUSCH uplink shared channel
  • FIG. 2 is a diagram illustrating an example of frequency band aggregation in the present embodiment.
  • FIG. 2A illustrates an example of downlink
  • FIG. 2B illustrates an example of uplink.
  • the horizontal axis indicates the frequency domain
  • the vertical axis indicates the time domain.
  • DCC-0 Downlink Component Carrier-0, DCC-1, and DCC-2
  • DCC-0 Downlink Component Carrier-0, DCC-1, and DCC-2
  • the base station apparatus and the mobile station apparatus transmit and receive three (up to) downlink data in the same subframe using each of the three downlink carrier elements. Can do. Also, three (up to) uplink data can be transmitted and received in the same subframe using each of the three uplink carrier elements.
  • FIG. 3 is a diagram illustrating a schematic configuration example of a radio frame (radio resource) of an uplink carrier element in the present embodiment.
  • the radio frame of the uplink carrier element is composed of a plurality of physical resource block (PRB) pairs.
  • PRB physical resource block
  • one physical resource block (PRB) pair is composed of two physical resource blocks (PRB) (PRB bandwidth ⁇ slot) that are continuous in the time domain.
  • One physical resource block (PRB) (a unit surrounded by a thick line in FIG. 3) is composed of 12 subcarriers in the frequency domain, and 7 DFT-Spread OFDM symbols in the time domain. It is composed of
  • a slot composed of 7 DFT-Spread OFDM symbols (one physical resource block (PRB)
  • a subframe composed of 2 slots and composed of 10 subframes
  • a plurality of physical resource blocks (PRBs) are arranged according to the bandwidth of the uplink carrier element.
  • the bandwidth of the uplink carrier element is broadcast from the base station apparatus using the downlink shared channel (PDSCH).
  • PDSCH downlink shared channel
  • a unit composed of one subcarrier and one DFT-Spread OFDM symbol is referred to as a resource element (RE).
  • RE resource element
  • Each uplink subframe is used for channel estimation of at least the uplink control channel (PUCCH), the uplink shared channel (PUSCH), the uplink control channel (PUCCH), and the uplink shared channel (PUSCH).
  • An uplink pilot channel is arranged.
  • the uplink control channel (PUCCH) is arranged from the physical resource block PRB pairs at both ends of the carrier element bandwidth, and the uplink shared channel (PUSCH) is arranged in the remaining physical resource block (PRB) pairs.
  • the uplink control channel (PUCCH) and the uplink shared channel (PUSCH) are not transmitted together.
  • the uplink pilot channel is time-multiplexed with the uplink shared channel (PUSCH) and the uplink control channel (PUCCH).
  • uplink shared channel data (transport block) is transmitted.
  • uplink control channel PUCCH
  • CQI Channel Quality Indicator
  • SRI scheduling request indicator
  • SRI scheduling request indicator
  • ACKnowledgement acknowledgment
  • ACK acknowledgment
  • ACK negative response
  • UCI Uplink Control Information
  • NACK Negative-ACKnowledgement
  • FIG. 4 is a diagram illustrating a schematic configuration example of a radio frame (radio resource) of a downlink carrier element in the present embodiment.
  • the radio frame of the downlink carrier element is composed of a plurality of physical resource block (PRB) pairs.
  • PRB physical resource block
  • one physical resource block (PRB) pair is composed of two physical resource blocks (PRB) (PRB bandwidth ⁇ slot) that are continuous in the time domain.
  • One physical resource block (PRB) is composed of 12 subcarriers in the frequency domain, and is composed of 7 OFDM symbols in the time domain.
  • a slot composed of seven OFDM symbols (one physical resource block (PRB)
  • a subframe composed of two slots and a radio frame composed of ten subframes.
  • PRB physical resource block
  • a plurality of physical resource blocks (PRB) are arranged according to the bandwidth of the downlink carrier element.
  • the bandwidth of the downlink carrier element is broadcast and transmitted from the base station apparatus using a broadcast channel (PBCH).
  • PBCH broadcast channel
  • a unit composed of one subcarrier and one OFDM symbol is called a resource element.
  • the broadcast channel is arranged in each downlink carrier element, and in the time domain, the first to fourth OFDM in the second slot of the radio frame.
  • the symbols are arranged in 72 subcarriers at the center of the bandwidth of the carrier element in the frequency domain.
  • the downlink control channel (PDCCH), the downlink shared channel (PDSCH), the downlink control channel (PDCCH), and the downlink shared channel (PDSCH) are propagated.
  • a downlink pilot channel used for path estimation is arranged.
  • the downlink control channel (PDCCH) is arranged from the first OFDM symbol of the subframe, and the downlink shared channel (PDSCH) is arranged in the remaining OFDM symbols.
  • the downlink pilot channel is not shown in FIG. 4 for simplicity of explanation, but the downlink pilot channel is distributed in the frequency domain and the time domain.
  • PBCH broadcast channel
  • PDSCH downlink shared channel
  • information indicating an identifier (UL-CC identifier) for identifying an uplink carrier element information indicating a modulation scheme (Modulation-scheme) for the uplink shared channel (PUSCH), a coding scheme (coding scheme), information indicating radio resource allocation (Resource allocation; RA), uplink grant composed of information bits (Information bit) such as information related to HARQ, and downlink carrier elements
  • Information bits such as information indicating an identifier (DL) CC identifier
  • Information bits such as information indicating an identifier (DL) CC identifier
  • information indicating a coding scheme information indicating radio resource allocation
  • information regarding HARQ Downlink grant (Downlink) consisting of bits Downlink control information (DCI) such as “grant” is transmitted.
  • the number of bits of information indicating radio resource allocation (RA) varies depending on the bandwidth of the carrier element.
  • the downlink shared channel (PDSCH) in which radio resource allocation is indicated by the downlink grant is arranged in the same subframe as the downlink grant of the downlink carrier element indicated by the DL CC identifier of the downlink grant.
  • the uplink shared channel (PUSCH) in which radio resource allocation is indicated by the uplink grant is arranged in a subframe after a predetermined time of the uplink carrier element indicated by the UL CC identifier of the uplink grant.
  • the mobile station apparatus itself uses a 16-bit mobile station identifier (RNTI) that can be uniquely identified in the base station apparatus.
  • a downlink control channel (PDCCH) addressed to the station apparatus is specified. Further, the uplink grant and the downlink grant are generated for each uplink and downlink carrier element to which radio resources are allocated.
  • Downlink control information format 0 instructing transmission of the uplink shared channel (PUSCH) with one antenna is included in the downlink grant downlink control information (DCI) format.
  • DCI format 0x instructing transmission of an uplink shared channel (PUSCH) by a MIMO (Multiple Input Multiple Output) scheme.
  • the downlink grant downlink control information (DCI) format includes a downlink control information format 1 (DCI format) indicating that the downlink shared channel (PDSCH) is transmitted by one transmission antenna or transmission diversity method.
  • Control information format 1A (DCI format 1A) in which the number of bits in the radio resource allocation (RA) field (field) of downlink control information (DCI) is the same as that of downlink control information format 0, downlink shared There is a downlink control information format 2 (DCI format 2) indicating that the channel (PDSCH) is transmitted by the MIMO scheme.
  • DCI format 1A the number of bits in the radio resource allocation (RA) field (field) of downlink control information (DCI) is the same as that of downlink control information format 0, downlink shared
  • DCI format 2 indicating that the channel (PDSCH) is transmitted by the MIMO scheme.
  • the format type of the downlink control information (DCI) is 1 bit DCIDformat 0 / 1A identifier. To be judged. Since the other downlink control (DCI) formats have different payload sizes from each other, different decoding processing methods are applied to identify the type of the downlink control information (DCI) format.
  • the base station apparatus sets the format of the downlink grant and downlink grant downlink control information (DCI) for each mobile station apparatus, and further monitors the set uplink grant and downlink grant.
  • DCI downlink grant downlink control information
  • a mobile station device specific search space UE ⁇ specific Search Space; USS
  • UE ⁇ specific Search Space USS
  • RNTI station identifier
  • downlink information including information on radio resource allocation (RA) of the downlink shared channel (PDSCH) common to a plurality of mobile station devices communicating with the base station device, including information such as bandwidth of uplink carrier elements.
  • a common search space (Common Search Space; CSS) in which the mobile station apparatus monitors link grants and the like is configured for each downlink carrier element.
  • CSS Common Search Space
  • a downlink control information format 0 and a downlink control information format 1A specific to the mobile station apparatus may be arranged.
  • the base station apparatus uses DCC-1 as a downlink carrier element that constitutes a mobile station apparatus specific search space (USS) in which the mobile station apparatus monitors uplink grants and downlink grants.
  • DCC-1 mobile station apparatus specific search space
  • the base station apparatus monitors the downlink control information format 0, the downlink control information format 1A, and the downlink control information format 2 in the mobile station apparatus specific search space (USS) in which the mobile station apparatus is DCC-1.
  • the mobile station apparatus monitors the downlink control information format 0, the downlink control information format 1A, and the downlink control information format 2 in the DCC-1 mobile station apparatus specific search space (USS), and DCC-0. And the downlink control information format 0 specific to the mobile station apparatus in the common search space (CSS) of DCC-1 and DCC-2, the downlink control information format 1A, and the downlink common to the plurality of mobile station apparatuses Monitor the grant.
  • SCS common search space
  • FIG. 5 is a functional block diagram showing a configuration example of the base station apparatus 1 in the present embodiment.
  • the base station apparatus 1 includes an upper layer 11, a control unit 15, a reception antenna 17, a reception processing unit 21, a demultiplexing unit 23, a demodulation unit 25, a decoding unit 27, a coding unit 31, and a modulation.
  • Unit 35, multiplexing unit 37, transmission processing unit 41, and transmission antenna 45 In the base station apparatus 1, the encoding unit 31, the modulation unit 35, the multiplexing unit 37, the transmission processing unit 41, the control unit 15, the upper layer 11, and the transmission antenna 45 constitute a transmission unit.
  • the decoding unit 27, the demodulation unit 25, the demultiplexing unit 23, the reception processing unit 21, the control unit 15, the upper layer 11, and the reception antenna 17 constitute a reception unit.
  • the encoding unit 31 acquires data and payload (payload) including information to be transmitted on each downlink channel from the control unit 15, and cycles from data transmitted on the broadcast channel (PBCH) and the downlink shared channel (PDSCH).
  • a redundancy check (CRC) code is generated, and a cyclic redundancy check (CRC) code is added to the data.
  • the encoding unit 31 performs error correction encoding on the data to which the cyclic redundancy check (CRC) code is added based on the control signal input from the control unit 15 with a turbo code or a convolutional code, and outputs it to the modulation unit 35. To do.
  • the encoding unit 31 generates a cyclic redundancy check (CRC) code from the payload (payload) of the downlink information information (DCI) that is input from the control unit 15 and transmitted through the downlink control channel (PDCCH). Then, a sequence obtained by exclusive-ORing the mobile station identifier (RNTI) assigned to the mobile station apparatus transmitting the downlink control channel (PDCCH) and the cyclic redundancy check (CRC) code is added to the payload. After that, the encoding unit 31 uses the control signal input from the control unit 15 to generate downlink control information (DCI) to which a cyclic redundancy check (CRC) code has been added, as a convolutional code having a predetermined encoding rate.
  • DCI downlink information information
  • CRC cyclic redundancy check
  • DCI downlink control information
  • rate matching rate matching
  • control channel element (Control Channel Element; CCE), which is a unit of radio resources in which a downlink control channel is arranged
  • this convolutionally coded bit is QPSK modulated.
  • 72 bits are included in one control channel element (CCE).
  • DCI downlink control information
  • DCI downlink control information
  • CRC cyclic redundancy check
  • RNTI mobile station identifier
  • DCI downlink control information
  • CCE control channel elements
  • the mobile station apparatus performs a process opposite to the process of the base station apparatus, which will be described later.
  • the modulation unit 35 Based on the control signal from the control unit 15, the modulation unit 35 performs quadrature phase shift keying (QPSK) on the error correction encoded code bits input from the encoding unit 31, 16 Modulation is performed by a modulation scheme such as value quadrature amplitude modulation (16 Quadrature Amplitude Modulation; 16QAM), 64-value quadrature amplitude modulation (64QAM) or the like, and a modulation symbol is generated and output to the multiplexing unit 37.
  • QPSK quadrature phase shift keying
  • the multiplexing unit 37 multiplexes the modulation symbol input from the modulation unit 35 on the resource element of the downlink subframe based on the control signal from the control unit 15 and outputs the multiplexed symbol to the transmission processing unit 41.
  • the transmission processing unit 41 Based on the control signal from the control unit 15, the transmission processing unit 41 performs inverse inverse Fourier transform (Inverse Fast FourierFTransform; IFFT) on the modulation symbol input from the multiplexing unit 37, performs OFDM modulation, and OFDM A guard interval (GI) is added to the modulated OFDM symbol, a baseband digital signal is generated, the baseband digital signal is converted to an analog signal, and the in-phase and quadrature components of the intermediate frequency from the analog signal Is generated, the extra frequency component for the intermediate frequency band is removed, the intermediate frequency signal is converted to a high frequency signal (up-conversion), the extra frequency component is removed, the power is amplified, and output to the transmitting antenna 45. Then send.
  • IFFT inverse Fast FourierFTransform
  • GI guard interval
  • the reception processing unit 21 Based on the control signal from the control unit 15, the reception processing unit 21 converts the signal received via the reception antenna 17 into an intermediate frequency (down-conversion), removes unnecessary frequency components, and has an appropriate signal level.
  • the amplification level is controlled so as to be maintained at the same level, and the quadrature demodulation is performed based on the in-phase component and the quadrature component of the received signal, and the analog signal subjected to the quadrature demodulation is converted into a digital signal.
  • the signal from which the portion is removed and the guard interval is removed is subjected to fast Fourier transform, and demodulation of the DFT-SpreadSOFDM method is performed.
  • the demultiplexing unit 23 Based on the control signal from the control unit 15, the demultiplexing unit 23 uses the uplink control channel (PUCCH), the uplink shared channel (PUSCH), the uplink from the reception signal demodulated by the reception processing unit 21 using the DFT-Spread OFDM method. A received signal of the link pilot channel is extracted from the resource element. Further, the demultiplexing unit 23 performs channel compensation on the reception signals of the uplink control channel (PUCCH) and the uplink shared channel (PUSCH) using the reception signal of the uplink pilot channel, and outputs the result to the demodulation unit 25. .
  • PUCCH uplink control channel
  • PUSCH uplink shared channel
  • the demodulation unit 25 Based on the control signal from the control unit 15, the demodulation unit 25 performs QPSK, 16QAM, and QPSK, 16QAM on the uplink control channel (PUCCH) and the uplink shared channel (PUSCH) received from the demultiplexing unit 23. Demodulation is performed using a demodulation method such as 64QAM, and the received bits are output to the decoding unit 27.
  • the decoding unit 27 Based on the control signal from the control unit 15, the decoding unit 27 performs turbo decoding on the received bits of the uplink control channel (PUCCH) and the uplink shared channel (PUSCH) input from the demodulation unit 25. Error correction decoding such as Viterbi decoding is performed and output to the control unit 15.
  • PUCCH uplink control channel
  • PUSCH uplink shared channel
  • the upper layer 11 performs processing of a packet data integration protocol (Packet Data Convergence Protocol: PDCP) layer, a radio link control (Radio Link Control: RLC) layer, and a radio resource control (Radio Resource Control: RRC) layer.
  • the upper layer outputs information to be transmitted to the mobile station apparatus to the control unit in each downlink channel, and outputs a control signal to control the control unit.
  • the upper layer 11 has a radio resource control unit 11a.
  • the radio resource control unit 11a includes uplink and downlink carrier elements assigned to the mobile station apparatus, and a mobile station apparatus specific search space (USS) in which the mobile station apparatus monitors the uplink grant and the downlink grant.
  • USS mobile station apparatus specific search space
  • Management of various setting information such as the link carrier element and the type of downlink control format (DCI) monitored by the mobile station device in the mobile station device specific search space (USS), management of communication status of each mobile station device, and movement It manages the buffer status for each station device, manages the mobile station identifier (RNTI), etc., and outputs information managed by the radio resource control unit 11a to the control unit 15 as necessary.
  • DCI downlink control format
  • USS mobile station device specific search space
  • RNTI mobile station identifier
  • the control unit 15 performs downlink and uplink scheduling (HARQ processing, etc.) and the like.
  • the control unit 15 includes a reception processing unit 21, a demultiplexing unit 23, a demodulation unit 25, a decoding unit 27, an encoding unit 31, a modulation unit 35, a multiplexing unit 37, and a transmission process.
  • a control signal is output to each processing unit.
  • the control unit 15 assigns radio resources, modulation schemes, and codes for uplink and downlink channels based on control signals input from the upper layer 11 and information managed by the radio resource control unit 11a. System selection processing and HARQ retransmission control are performed, and a control signal used to control each processing unit is generated.
  • control unit 15 assigns radio resources for the uplink shared channel (PUSCH) and the downlink shared channel (PDSCH), a modulation method and a coding method selection process, and a downlink control result indicating the result of retransmission control in HARQ.
  • Information bits (information bit) of control information (DCI) are generated.
  • control unit 15 has a bit insertion unit 15a.
  • the bit insertion unit 15a inserts a bit into information bits (information bit) of the downlink control information (DCI) generated by the control unit 15 to generate a payload of the downlink control information (DCI). Output to the conversion unit.
  • the bit insertion unit 15a includes the uplink and downlink carrier elements allocated to the mobile station apparatus, the bandwidths of the uplink and downlink carrier elements, and the downlink monitored by the mobile station apparatus.
  • the format type of the link control information (DCI) is acquired from the upper layer 11.
  • the bit insertion unit 15a determines the number of information bits (information bit) in the format of the downlink control information (DCI) that the mobile station apparatus monitors in the mobile station apparatus specific search space (USS) as the downlink control information ( DCI) is calculated based on the bandwidth of the corresponding uplink or downlink carrier element, and the number of information bits of the same or multiple types of downlink control information (DCI) formats is compared.
  • the number of information bits in the format of downlink control information (DCI) having a large number of bits is defined as the payload size.
  • the bit insertion unit 15a receives the number of information bits (information bit) of the downlink control information (DCI) acquired from the control unit 15 in the payload of the downlink control channel format calculated by the bit insertion unit 11a. Until the number of bits becomes the same as the number, bits are inserted (padding) into the head part (Most Significant Bit; MSB) or the tail part (Least Significant Bit; LSB) of the information bit, and the payload of the downlink control channel (DCI) Generate and output to the encoding unit 31. Bit values inserted by the bit insertion unit 15a into the information bits of the downlink control information (DCI) are predetermined values such as “0” and all “1”, which are known by the mobile station apparatus.
  • control unit 15 outputs information to be transmitted on the downlink input from the higher layer 11 to the encoding unit 31.
  • control unit 15 processes the information acquired from the uplink input from the decoding unit 27 as necessary, and then outputs the information to the upper layer 11.
  • FIG. 6 is a functional block diagram showing a configuration example of the mobile station apparatus 2 in the present embodiment.
  • the mobile station apparatus 2 includes an upper layer 51, a control unit 53, a reception antenna 55, a reception processing unit 57, a demultiplexing unit 61, a demodulation unit 63, a decoding unit 65, an encoding unit 67, a modulation Unit 71, multiplexing unit 73, transmission processing unit 75, and transmission antenna 77.
  • the encoding unit 67, the modulation unit 71, the multiplexing unit 73, the transmission processing unit 75, the control unit 53, the upper layer 51, and the transmission antenna 77 constitute a transmission unit.
  • the decoding unit 65, the demodulation unit 63, the demultiplexing unit 61, the reception processing unit 57, the control unit 53, the upper layer 51, and the reception antenna 55 constitute a reception unit.
  • the encoding unit 67 acquires data to be transmitted on each uplink channel from the control unit 53, generates a cyclic redundancy check (CRC) code from the data to be transmitted on the uplink shared channel (PUSCH), and performs cyclic redundancy check ( CRC) code is added, and based on the control signal inputted from the control unit 53, information to which the cyclic redundancy check (CRC) code is added and data to be transmitted on the downlink control channel (PUCCH) are turbo code or read maller Error correction coding is performed using a (Reed Muller) code or the like, and the result is output to the modulation unit 71.
  • CRC cyclic redundancy check
  • the modulation unit 71 Based on the control signal from the control unit 53, the modulation unit 71 modulates the error correction encoded code bits input from the encoding unit 67 with a modulation scheme such as QPSK, 16QAM, 64QAM, etc. A modulation symbol is generated and output to multiplexing section 73.
  • a modulation scheme such as QPSK, 16QAM, 64QAM, etc.
  • the multiplexing unit 73 multiplexes the modulation symbol input from the modulation unit 71 on the resource element of the uplink subframe based on the control signal from the control unit 53, and outputs it to the transmission processing unit 75.
  • the transmission processing unit 75 Based on the control signal from the control unit 53, the transmission processing unit 75 performs fast inverse Fourier transform (IFFT) on the modulation symbol input from the multiplexing unit 73, performs DFT-Spread OFDM modulation, and performs DFT-Spread. Adds a guard interval to an OFDM-modulated DFT-Spread OFDM symbol, generates a baseband digital signal, converts the baseband digital signal to an analog signal, and generates an in-phase component and quadrature component of an intermediate frequency from the analog signal Then, an extra frequency component with respect to the intermediate frequency band is removed, an intermediate frequency signal is converted into a high frequency signal (up-conversion), an extra frequency component is removed, power is amplified, and output to the transmission antenna 77.
  • IFFT fast inverse Fourier transform
  • the reception processing unit 57 Based on the control signal from the control unit 53, the reception processing unit 57 converts the signal received via the reception antenna 55 into an intermediate frequency (down-conversion), removes unnecessary frequency components, and has an appropriate signal level.
  • the amplification level is controlled so as to be maintained at the same level, and the quadrature demodulation is performed based on the in-phase component and the quadrature component of the received signal, and the analog signal subjected to the quadrature demodulation is converted into a digital signal.
  • the signal from which the part is removed and the guard interval is removed is subjected to fast Fourier transform, and demodulation of the OFDM method is performed.
  • the demultiplexing unit 61 Based on the control signal from the control unit 53, the demultiplexing unit 61 generates a downlink control channel (PDCCH), a downlink shared channel (PDSCH), and a downlink pilot channel from the received signal demodulated by the reception processing unit 57 using the OFDM method.
  • the received signal is extracted from the resource element.
  • the received signal of the downlink control channel (PDCCH) and the downlink shared channel (PDSCH) is subjected to propagation path compensation using the received signal of the downlink pilot channel, and is output to the demodulator 63.
  • the demodulation unit 63 Based on the control signal from the control unit 53, the demodulation unit 63 performs QPSK, 16QAM, and QPSK, 16QAM, on the downlink control channel (PDCCH) and the downlink shared channel (PDSCH) received from the demultiplexing unit 61. Demodulation is performed using a demodulation method such as 64QAM, and the demodulated bits are output to the decoding unit 65.
  • a demodulation method such as 64QAM
  • the decoding unit 65 performs error correction decoding on the demodulated bits of the downlink shared channel (PDSCH) input from the demodulation unit 63 and outputs the decoded payload to the control unit 53. Specifically, the decoding unit 65 receives the payload size of each format of the downlink control channel (PDCCH) from the control unit 53 for the demodulated bits of the downlink control channel (PDCCH) input from the demodulation unit 63. The reverse of the rate matching (rate de-matching) is performed and the error correction decoding is performed with the number of bits indicated by the control signal.
  • PDSCH downlink shared channel
  • the decoding unit 65 is a sequence in which exclusive OR of the cyclic redundancy check (CRC) code added to the payload of the downlink control channel (PDCCH) and the mobile station identifier (RNTI) is performed on the transmission side.
  • CRC cyclic redundancy check
  • an exclusive OR is performed by the mobile station identifier (RNTI) assigned to the own station apparatus from the base station apparatus, and a cyclic redundancy check (CRC) code is obtained, and then error detection is performed.
  • the decoding unit 65 outputs the downlink control channel (PDCCH) payload to the control unit 53 as a payload transmitted from the base station apparatus 1.
  • the decoding unit 65 performs different rate dematching processing depending on the payload size of the downlink control information (DCI) monitored by the mobile station apparatus 2.
  • DCI downlink control information
  • the upper layer 51 performs processing of a packet data integration protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (RRC) layer.
  • the upper layer 51 outputs a control signal to control the control unit 53.
  • the upper layer 51 has a radio resource control unit 51a.
  • the radio resource control unit 51a includes carrier elements assigned by the base station apparatus 1, downlink carrier elements constituting a mobile station apparatus specific search space (USS) for monitoring downlink control information (DCI), and mobile stations.
  • USS mobile station apparatus specific search space
  • the upper layer 51 performs cyclic redundancy check (CRC) using a cyclic redundancy check (CRC) code added to the downlink shared channel (PDSCH), and uses the downlink shared channel (PDSCH) to form a base station apparatus. Error detection of data transmitted from 1 is performed.
  • the upper layer 51 generates an acknowledgment (ACK) or a negative acknowledgment (NACK) as an error detection result of the cyclic redundancy check (CRC) of the downlink shared channel (PDSCH), and outputs it to the control unit 53.
  • the control unit 53 performs downlink and uplink scheduling (HARQ processing, etc.) and the like.
  • the control unit 53 includes a reception processing unit 57, a demultiplexing unit 61, a demodulation unit 63, a decoding unit 65, an encoding unit 67, a modulation unit 71, a multiplexing unit 73, and a transmission processing unit 75.
  • a control signal is output to each processing unit.
  • the control unit 53 Based on the control signal input from the higher layer 51, the downlink control information (DCI) input from the decoding unit 65, etc., the control unit 53 allocates and modulates radio resources for uplink and downlink channels. And encoding scheme selection processing, HARQ retransmission control, and generation of control signals used for control of each processing unit.
  • DCI downlink control information
  • the control unit 53 has a bit deletion unit 53a.
  • the bit deletion unit 53a calculates the payload size of each format of the downlink control information (DCI), and is inserted in the payload of the downlink control information (DCI) input from the decoding unit 65 in the base station apparatus 1. Remove bits and get information bits.
  • the bit deletion unit 53a monitors the uplink and downlink carrier elements assigned to the own station apparatus, the bandwidths of the uplink and downlink carrier elements, and the own station apparatus.
  • the type of the format of the downlink control information (DCI) is acquired from the upper layer 51, and the number of information bits of the format of the downlink control information (DCI) is determined based on the bandwidth of the uplink or downlink carrier element, respectively.
  • the number of information bits of the same or a plurality of types of downlink control information (DCI) formats is compared, and the number of information bits having the largest number of bits is calculated in the format of the downlink control information (DCI).
  • the decoding unit 65 is notified of the payload size in the format of downlink control information (DCI) as the payload size.
  • bit deletion unit 53a uses the information bits (information bits) indicating the UL CC identifier or DL CC identifier in the payload of the downlink control information (DCI) input from the decoding unit 65 to the downlink control information (DCI).
  • the bit insertion unit 15a of the base station apparatus 1 determines how many bits of a predetermined value are inserted (padding) in the payload, and removes the inserted bits ( discard) to obtain information bits (information bit) from the payload of downlink control information (DCI)
  • control unit 53 outputs data to be transmitted on the uplink input from the higher layer 51 to the encoding unit 67.
  • the control unit 53 processes the information acquired from the downlink input from the decoding unit 65 as necessary, and then outputs the information to the upper layer 51.
  • FIG. 7 is a diagram showing a schematic configuration example of a payload in the format of downlink control information (DCI) in the present embodiment.
  • FIG. 7 shows, as an example, downlink control information format 1A and downlink control information format 0 addressed to a mobile station apparatus to which uplink and downlink carrier elements are assigned as shown in FIG.
  • a hatched square indicates an area in which a bit of “0” that is a known value is inserted in the base station apparatus, and a white square in FIG. 7 indicates downlink control information not shown in the figure.
  • region which comprises a format is shown.
  • the information format 7 indicates the assignment of radio resources to DL CC-0, DL CC-1, and DL CC-2 in order from the top.
  • the information format 0 indicates the assignment of radio resources to UL CC-0, UL CC-1, UL CC-2 in order from the top.
  • the information bits of the downlink control information format 1A and the downlink control information format 0 are a DCI format 0 / 1A identifier, a DL CC identifier or a UL CC identifier for identifying the downlink control information format 1A and the downlink control information format 0, wireless It is composed of a resource allocation (RA) area and other white areas.
  • RA resource allocation
  • the number of bits in the radio resource allocation (RA) area of the downlink control information format 1A is calculated based on the bandwidth of the downlink carrier element corresponding to the downlink control information format 1A.
  • the number of bits in the radio resource allocation (RA) area of the uplink control information format 0 is calculated based on the bandwidth of the uplink carrier element corresponding to the downlink control information format 0.
  • the number of information bits of the downlink control information 1A corresponding to DL CC-0 is the largest number of bits among all the information bits of the downlink control information format 0 and the downlink control information format 1A. It is an information bit and becomes the payload size of the downlink control information format 0 and the downlink control information format 1A.
  • downlink control information format 1A corresponding to DL ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ CC-1 and DL CC-2
  • information bits of downlink control information format 0 corresponding to UL CC-0, UL CC-1 and UL CC-2
  • Bits with a value of “0” are inserted (slashed) until the same number of bits as the payload size is inserted in the end portion (LSB) of the, and a payload is generated.
  • LSB end portion
  • MSB beginning portion
  • the decoding unit 65 of the mobile station device 2 performs rate matching processing (decimating bits or the like) on the downlink control information (DCI) that has been subjected to error correction coding depending on the payload size of the downlink control information (DCI). , Or repeat) is different. Therefore, when there are a plurality of payload sizes, the mobile station apparatus 2 first performs a reverse process of rate matching assuming a certain payload size.
  • error correction decoding is performed, and a mobile station identifier (RNTI) assigned to the own station apparatus, and a sequence obtained by taking an exclusive OR of the mobile station identifier (RNTI) and a cyclic redundancy check (CRC) code Perform exclusive OR, acquire cyclic redundancy check (CRC) code, perform error detection using cyclic redundancy check (CRC) code, and detect error, rate matching assuming other payload size Start over from processing.
  • RNTI mobile station identifier
  • CRC cyclic redundancy check
  • the downlink control channel (PDCCH) addressed to the own station apparatus is arranged in which control channel element (CCE) in the mobile station apparatus specific search space (USS) and the common search space (CSS).
  • CCE control channel element
  • USS mobile station apparatus specific search space
  • SCS common search space
  • the mobile station apparatus 2 is assigned to all control channel elements (CCE) in which the downlink control channel (PDCCH) in the mobile station apparatus specific search space (USS) and the common search space (CSS) may be arranged.
  • processing from the reverse of the rate matching to error detection is performed. In particular, reverse processing of rate matching and error correction decoding are burdens on the mobile station apparatus 2.
  • the payload size by making the payload size the same for each format of the downlink control information (DCI), it is related to the bandwidth of the uplink or downlink carrier element to which the downlink control information (DCI) corresponds.
  • the process from the reverse of the rate matching to the error detection since the process from the reverse of the rate matching to the error detection is common, the number of processes from the reverse of the rate matching to the error detection can be reduced.
  • FIG. 8 is a flowchart showing an example of the operation of the base station apparatus 1 in the present embodiment (also refer to FIG. 5).
  • step S10 the radio resource control unit 11a sets the uplink and downlink carrier elements to be allocated to the mobile station apparatus, and the downlink carrier element in which the mobile station apparatus specific search space (USS) is set. Then, the mobile station apparatus specific search space (USS) determines the format type of the downlink control information (DCI) monitored by the mobile station apparatus, and notifies the mobile station apparatus via the transmission antenna. Next, the process proceeds to step S11. In step S11, the bit insertion unit 15a uses the bandwidths of the uplink and downlink carrier elements allocated to the mobile station apparatus managed by the radio resource control unit 11a, and performs downlink control corresponding to each carrier element. The number of information bits in the channel (DCI) format is calculated.
  • DCI downlink control information
  • step S12 the bit insertion unit 15a compares the number of information bits of downlink control information (DCI) of the same format or a plurality of formats calculated in step S11, and determines the number of information bits having the largest number of bits.
  • the payload size is in the format of the downlink control control information (DCI).
  • step S13 the process proceeds to step S13.
  • step S13 the bit insertion unit 15a acquires the downlink control information (DCI) information acquired from the control unit 15 until the payload size is the same as the payload size of the downlink control control information (DCI) format determined in step S12.
  • a payload is generated by inserting a bit having a value known to the mobile station apparatus into the beginning part (MSB) or the end part (LSB) of the bit.
  • MSB beginning part
  • LSB end part
  • step S14 the base station apparatus 1 adds a sequence that is an exclusive OR of a cyclic redundancy check (CRC) code and a mobile station identifier (RNTI) to the payload of the downlink control information (DCI) format, and corrects the error. Encode and modulate and transmit via transmit antenna.
  • CRC cyclic redundancy check
  • RNTI mobile station identifier
  • step S14 the base station apparatus 1 ends the process related to transmission of the downlink control channel.
  • FIG. 9 is a flowchart showing an example of the operation of the mobile station apparatus 2 in the present embodiment (see also FIG. 6).
  • step S20 the radio resource control unit 51a moves the uplink and downlink carrier elements assigned to the local station device notified from the base station device 1 via the reception antenna 55 and the movement.
  • a downlink carrier element constituting the station apparatus specific search space (USS) and a format type of downlink control information (DCI) monitored by the own station apparatus are set.
  • the process proceeds to step S21.
  • step S21 the radio resource control unit 51a transmits the bandwidth of the downlink carrier element allocated to the local station device from the broadcast channel (PBCH) transmitted from the base station device 1 via the reception antenna 55. And the bandwidth of the uplink carrier element allocated to the local station apparatus is acquired from the downlink shared channel (PDSCH).
  • PBCH broadcast channel
  • PDSCH downlink shared channel
  • step S22 the bit deletion unit 53a uses the bandwidths of the uplink and downlink carrier elements allocated to the local station apparatus managed by the radio resource control unit 51a to perform downlink control corresponding to each carrier element.
  • the number of information bits in the channel (DCI) format is calculated.
  • the process proceeds to step S23.
  • step S23 the bit deletion unit 53a compares the number of information bits of downlink control information (DCI) of the same format or a plurality of formats calculated in step S22, and determines the number of information bits having the largest number of bits.
  • the payload size in the format of downlink control information (DCI) is calculated as the payload size in the format of downlink control control information (DCI).
  • step S24 the decoding unit 65 places the payload size in the downlink control information (DCI) format on the downlink control channel (PDCCH) received via the reception antenna, assuming that the payload size is that calculated in step S23.
  • the received downlink control information (DCI) format is monitored, and downlink control information (DCI) format demodulation, error correction decoding, and error detection are performed.
  • the process proceeds to step S25.
  • step S25 the decoding unit 65 identifies the type of format from the method for decoding downlink control information (DCI). Next, the process proceeds to step S26.
  • DCI downlink control information
  • step S26 the bit deletion unit 53a identifies the uplink or downlink carrier element corresponding to the downlink control information (DCI) by the UL-CC identifier or the DL-CC identifier included in the downlink control information (DCI). .
  • the process proceeds to step S27.
  • step S27 the bit deletion unit 53a determines the number of information bits of the uplink or downlink carrier element corresponding to the downlink control information (DCI) and the payload size of the downlink control information (DCI) calculated in step S23. In comparison, the known bits inserted in the beginning part (MSB) or the end part (LSB) of the payload are discarded, and information bits are obtained.
  • DCI downlink control information
  • MSB beginning part
  • LSB end part
  • step S27 the mobile station apparatus 2 ends the process related to reception of the downlink control channel.
  • the bit insertion unit of the base station apparatus compares the number of bits in the radio resource allocation (RA) area of the same type of downlink control information (DCI) format, and allocates the radio resource allocation (RA) having the largest number of bits. ) Insert a bit of a value known to the mobile station device into the beginning part (MSB) or the end part (LSB) of the radio resource allocation (RA) area until the number of bits becomes the same as the number of bits in the area of Also good.
  • FIG. 10 is a diagram showing a modification of the payload in the format of the downlink control information (DCI) in the present embodiment.
  • FIG. 10 shows, as an example, downlink control information format 1A and downlink control information format 0 addressed to a mobile station apparatus to which uplink and downlink carrier elements are assigned as shown in FIG.
  • a hatched square in FIG. 10 indicates an area where a bit of “0”, which is a known value in the mobile station apparatus, is inserted, and a white square in FIG. 10 indicates downlink control information not shown in the figure.
  • region which comprises a format is shown.
  • the downlink control information format 1A in the figure indicates the assignment of radio resources to DL CC-0, DL ⁇ CC-1, and DL CC-2 in order from the top
  • the uplink control information format in the figure. 0 indicates the assignment of radio resources to UL ⁇ ⁇ ⁇ ⁇ CC-0, UL CC-1, UL CC-2 in order from the top.
  • the information bits of the downlink control information format 1A and the downlink control information format 0 are a DCI format 0 / 1A identifier, a DL CC identifier or a UL CC identifier for identifying the downlink control information format 1A and the downlink control information format 0, wireless It is composed of a resource allocation (RA) area and other areas.
  • RA resource allocation
  • the number of bits in the radio resource allocation (RA) area of the downlink control information format 1A is calculated based on the bandwidth of the downlink carrier element to which the mobile station apparatus is allocated. Since the number of bits in the radio resource allocation area increases as the bandwidth of the carrier element increases, the number of bits increases in the radio resource allocation area of DL CC-0, which is the maximum bandwidth in FIG.
  • the head part (MSB) of the radio resource allocation (RA) of the downlink control information format 1A for DL-CC-1 and DL-CC-2 has the same number of bits as the radio resource allocation (RA) area for DL-CC-0. Until this time, a bit having a value of “0” is inserted, and a payload is generated.
  • the number of bits in the radio resource allocation (RA) area of the uplink control information format 0 is calculated based on the bandwidth of the downlink carrier element to which the mobile station apparatus is allocated. Since the number of bits in the radio resource allocation area increases as the bandwidth of the carrier element increases, the number of bits increases in the radio resource allocation area of DL CC-0, which is the maximum bandwidth in FIG.
  • the head part (MSB) of the radio resource allocation (RA) of the downlink control information format 0 for DL-CC-1 and DL-CC-2 has the same number of bits as the radio resource allocation (RA) area for DL-CC-0. Until that time, bits having a value of “0” are inserted.
  • the number of bits of the downlink control information format 1A and the downlink control information format 0 are compared, and the larger number of bits is set as the payload size, and the smaller number of bits is used until it becomes the same as the payload size.
  • a bit having a value of “0” is inserted into the last part (LSB) of the downlink control information format, and a payload is generated.
  • FIG. 10 shows the case where a bit is inserted in the beginning part (MSB) of the radio resource allocation (RA) area, the bit may be inserted in the end part (LSB) of the radio resource allocation (RA). .
  • the base station apparatus can use a plurality of downlink control information (DCI) format payloads of the same type, downlink control information format 0 and downlink control information format 1A.
  • DCI downlink control information
  • the payload sizes of the formats of the plurality of types of downlink control information (DCI) are made the same, so that the mobile station apparatus
  • the load when the mobile station apparatus monitors the downlink control channel (PDCCH) can be reduced, and the delay of the decoding process can be reduced.
  • the mobile station apparatus of the radio communication system identifies the carrier element by the UL-CC identifier or DL-CC identifier included in the downlink control information (DCI), and the downlink control information (DCI).
  • the mobile station apparatus is identified by the mobile station identifier (RNTI) included in the base station apparatus, but the base station apparatus assigns a plurality of mobile station identifiers (RNTI) to the mobile station apparatus, and the correspondence between the mobile station identifier (RNTI) and the carrier element
  • the mobile station device may identify the carrier element by the mobile station identifier (RNTI) added to the downlink control information (DCI).
  • a program that operates on a base station apparatus and a mobile station apparatus related to the present invention is a program (a program that causes a computer to function) that controls a CPU (Central Processing Unit) so as to realize the functions of the above-described embodiments related to the present invention. It is. Information handled by these devices is temporarily stored in RAM (Random Access Memory) during processing, and then stored in various ROMs such as Flash ROM (Read Only Memory) and HDD (Hard Disk Drive). Reading, correction, and writing are performed by the CPU as necessary.
  • RAM Random Access Memory
  • ROMs Read Only Memory
  • HDD Hard Disk Drive
  • Computer for realizing functions of upper layer, control unit, reception antenna, reception processing unit, demultiplexing unit, demodulation unit, decoding unit, encoding unit, modulation unit, multiplexing unit, transmission processing unit, and transmission antenna The processing of each unit may be performed by recording the program on a readable recording medium, reading the program recorded on the recording medium into a computer system, and executing the program.
  • the “computer system” here includes an OS and hardware such as peripheral devices.
  • the “computer-readable recording medium” means a storage device such as a flexible disk, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case is also used to hold a program for a certain period of time.
  • the program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

Landscapes

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

Abstract

Le nombre de bits d'information dans des informations de contrôle transmises dans des ensembles individuels d'informations de contrôle de même format adressés à un même dispositif de station mobile est comparé aux informations de contrôle qui comprennent les bits d'information représentant l'attribution des ressources sans fil adressées aux dispositifs de station mobile. Le nombre de bits d'information qui est le plus élevé est traité comme la taille de données utiles des informations de contrôle, et les bits sont insérés dans les bits d'information jusqu'à ce que le nombre de bits d'information des informations de contrôle atteigne la taille des données utiles. Cela permet de résoudre un certain nombre de problèmes, à savoir des problèmes selon lesquels le nombre d'itérations du traitement complexe par les dispositifs mobiles augmente, la charge sur les dispositifs de station mobile augmente, et le délai de décodage augmente lorsque de multiples autorisations de liaisons montantes ou autorisations de liaisons descendantes ayant des nombres différents de bits d'information sont contrôlées.
PCT/JP2010/052036 2009-02-16 2010-02-12 Système de communication sans fil, dispositif de station de base, dispositif de station mobile, procédé de transmission sans fil, procédé de réception sans fil et programme WO2010093006A1 (fr)

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WO2012093594A1 (fr) * 2011-01-07 2012-07-12 株式会社エヌ・ティ・ティ・ドコモ Station de base sans fil, terminal utilisateur et procédé de communication sans fil
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RU2700667C1 (ru) * 2016-02-05 2019-09-18 Нек Корпорейшн Исполнение пространства поиска для связи машинного типа
CN114731210A (zh) * 2019-11-26 2022-07-08 华为技术有限公司 一种通信方法及装置
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JP2015046912A (ja) * 2009-10-15 2015-03-12 クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ 複数のシステム帯域幅についてのリソース割り当てを伝達するための方法および装置
WO2012063886A1 (fr) * 2010-11-08 2012-05-18 Sharp Kabushiki Kaisha Commutation pucch et pusch dynamique simultanée pour un système lte-a
WO2012093594A1 (fr) * 2011-01-07 2012-07-12 株式会社エヌ・ティ・ティ・ドコモ Station de base sans fil, terminal utilisateur et procédé de communication sans fil
JP2012147131A (ja) * 2011-01-07 2012-08-02 Ntt Docomo Inc 無線基地局装置、無線通信方法及び無線通信システム
TWI452924B (zh) * 2011-01-07 2014-09-11 Ntt Docomo Inc Wireless base station device, wireless communication method and wireless communication system
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RU2700667C1 (ru) * 2016-02-05 2019-09-18 Нек Корпорейшн Исполнение пространства поиска для связи машинного типа
RU2718116C2 (ru) * 2016-02-05 2020-03-30 Нек Корпорейшн Исполнение пространства поиска для связи машинного типа
US11330574B2 (en) 2016-02-05 2022-05-10 Nec Corporation Communication system
US12041632B2 (en) 2016-02-05 2024-07-16 Nec Corporation Communication system
CN114731210A (zh) * 2019-11-26 2022-07-08 华为技术有限公司 一种通信方法及装置
CN114731210B (zh) * 2019-11-26 2023-11-17 华为技术有限公司 一种通信方法及装置

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