US20100309808A1 - Mobile communication system, base station apparatus, user equipment, and method - Google Patents

Mobile communication system, base station apparatus, user equipment, and method Download PDF

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Publication number
US20100309808A1
US20100309808A1 US12/811,839 US81183908A US2010309808A1 US 20100309808 A1 US20100309808 A1 US 20100309808A1 US 81183908 A US81183908 A US 81183908A US 2010309808 A1 US2010309808 A1 US 2010309808A1
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Prior art keywords
channel
acknowledgement
information
users
acknowledgement information
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Nobuhiko Miki
Mamoru Sawahashi
Kenichi Higuchi
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NTT Docomo Inc
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NTT Docomo Inc
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Assigned to NTT DOCOMO, INC. reassignment NTT DOCOMO, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HIGUCHI, KENICHI, MIKI, NOBUHIKO, SAWAHASHI, MAMORU
Publication of US20100309808A1 publication Critical patent/US20100309808A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users

Definitions

  • the present invention generally relates to a technical field of a mobile communication, and more particularly to a mobile communication system, a base station apparatus, user equipment, and method using a next-generation mobile communication technique.
  • next-generation mobile communication system of the so-called third-generation system has been studied by 3GPP (3RD Generation Partnership Project) which is a standards body of the W-CDMA (Wideband Code Division Multiple Access).
  • W-CDMA Wideband Code Division Multiple Access
  • HSUPA High Speed Uplink Packet Access
  • HSDPA High Speed Downlink Packet Access
  • LTE Long term Evolution
  • an OFDM (Orthogonal Frequency Division Multiplexing) scheme and an SC-FDMA (Single-Carrier Frequency Division Multiple Access) scheme have been studied to be applied to the downlink communications system and the uplink communications system, respectively (see, for example, Non-Patent Document 1).
  • the OFDM scheme is a multi-carrier transmission scheme in which a frequency band is divided into plural narrower frequency bands (sub-carriers), and data to be transmitted are mapped onto the sub-carriers.
  • sub-carriers narrower frequency bands
  • the SC-FDMA scheme is a single carrier transmission scheme in which a frequency band is divided for each user equipment (hereinafter may be referred to as a user equipment (UE) terminal) in a manner such that different frequencies can be separately used (allocated) among plural terminals (user equipment (UE) terminals).
  • UE user equipment
  • a range of transmission power fluctuation may be made smaller; therefore, lower energy consumption in terminals may be achieved, and a wider coverage area may also be obtained.
  • communications are performed by allocating one or more resource blocks (RBs) or resource units (RUs).
  • the resource blocks are shared among the plural user equipment (UE) terminals.
  • the base station apparatus determines which resource blocks are allocated to which user equipment (UE) terminals among the plural user equipment (UE) terminals for each sub-frame having a duration of 1 ms.
  • the sub-frame may also be called a Transmission Time Interval (TTI).
  • TTI Transmission Time Interval
  • the determination of the allocation of radio resources is called scheduling.
  • the base station apparatus transmits a shared channel using one or more resource blocks to the user equipment (UE) terminal selected in the scheduling.
  • This shared channel may be called a Physical Downlink Shared CHannel (PDSCH).
  • PDSCH Physical Downlink Shared CHannel
  • the user equipment (UE) terminal selected in the scheduling transmits a shared channel using one or more resource blocks to the base station apparatus.
  • This shared channel may be called a Physical Uplink Shared CHannel (PUSCH).
  • PUSCH Physical
  • a control channel is generally used.
  • the control channel may be called a Physical Downlink Control CHannel (PDCCH) or a Downlink L1/L2 Control Channel (DL-L1/L2 Control Channel).
  • a downlink control signal may include not only this PDCCH but also a Physical Control Format Indicator CHannel (PCFICH) and a Physical Hybrid Indicator CHannel (PHICH) and the like.
  • PCFICH Physical Control Format Indicator CHannel
  • PHICH Physical Hybrid Indicator CHannel
  • the PDCCH may include, for example, the following information items (see, for example, Non-Patent Document 2).
  • the Downlink Scheduling Information includes, for example, information of the downlink shared channel, and specifically, allocation information of downlink resource blocks, identification information of user equipment (UE) terminal (UE-ID), the number of streams, information of Pre-coding vector, data size, modulation scheme, information of HARQ (Hybrid Automatic Repeat ReQuest) and the like.
  • UE user equipment
  • UE-ID user equipment terminal
  • HARQ Hybrid Automatic Repeat ReQuest
  • the Uplink Scheduling Grant includes, for example, information of the uplink shared channel, and specifically, allocation information of uplink resource blocks, identification information of user equipment (UE) terminal (UE-ID), data size, modulation scheme, information of uplink transmission power, Demodulation Reference Signal in uplink MIMO (Multiple Input Multiple Output) and the like.
  • UE user equipment
  • UE-ID user equipment terminal
  • modulation scheme information of uplink transmission power
  • Demodulation Reference Signal in uplink MIMO Multiple Input Multiple Output
  • the PCFICH transmits a format of PDCCH. More specifically, the number of OFDM symbols used for the PDCCH is transmitted using the PCFICH. In the LTE system, the number of OFDM symbols used for the PDCCH is 1, 2, or 3, and the OFDM symbol(s) within a subframe are sequentially mapped from the first OFDM symbol of the subframe.
  • the PHICH includes Acknowledgement/Non-Acknowledgement information (ACK/NACK) indicating whether the PUSCH transmitted in uplink is required to be retransmitted.
  • ACK/NACK Acknowledgement/Non-Acknowledgement information
  • the PDCCH, the PCFICH, and the PHICH may be defined as equivalent channels independent from each other, or, for example, may be defined in a manner such that the PDCCH includes the PCFICH and the PHICH.
  • the PUSCH transmits user data (normal data signal) and accompanying control information. Further, besides the PUSCH, a Physical Uplink Control CHannel (PUCCH) transmits downlink CQI (Channel Quality Indicator), the Acknowledgement/Non-Acknowledgement information (ACK/NACK) of the PDSCH and the like.
  • the CQI is used as in, for example, the scheduling process, AMCS (Adaptive Modulation and Coding Scheme) of the PDSCH and the like.
  • a Random Access CHannel (RACH) and a signal requesting for the allocation of uplink/downlink radio resources may be transmitted on an as-needed basis.
  • FIG. 1 schematically shows an example of mapping of a downlink signal.
  • a Reference Signal (RS) and the PHICH Physical Hybrid ARQ Indicator Channel, or ACK/NACK
  • RS Reference Signal
  • PHICH Physical Hybrid ARQ Indicator Channel
  • ACK/NACK Physical Hybrid ARQ Indicator Channel
  • a sub-frame having a duration of 1 ms may have two slots, each slot having a duration of 0.5 ms.
  • One slot may include, for example, six or seven OFDM symbols.
  • the first one up to three OFDM symbols within one sub-frame are used for the downlink control signal (and the reference signal (RS)).
  • the PHICH expresses the ACK/NACK. Because of this feature, the PHICH may be essentially expressed by one bit. However, the PHICH (ACK/NACK) is the most fundamental information in retransmission control, and may greatly influence the system throughput. In this regard, the PHICH (ACK/NACK) largely differs from other control information items.
  • SF Spreading Factor
  • the PHICHs of the four users are mapped to three different regions on the frequency axis. In other words, the PHICHs of the four users are simultaneously transmitted using three different frequencies.
  • an orthogonal modulation scheme is used.
  • FIG. 2 schematically shows a state where the PHICHs of four users are code division multiplexed on four sub-carriers and mapped to only the I-channel (I-ch). Alternatively, the PHICHs of the four users may be mapped to only the Q channel (Q-ch).
  • FIG. 3 schematically shows a state where the PHICHs of eight users are code division multiplexed on four sub-carriers and mapped to the I-channel (I-ch) and the Q-channel (Q-ch).
  • the PHICH of one user is mapped to either the I-channel (I-ch) or the Q-channel (Q-ch). From the viewpoint of increasing the number of multiplexed users, it may be preferable to multiplex the PHICHs of the users as shown in FIG. 3 .
  • the number of multiplexed users (amount of transmitted information) can be doubled (see, for example, Non-Patent Document 4).
  • Non-Patent Document 1 3GPP TR 25.814 (V7.0.0), “Physical Layer Aspects for Evolved UTRA,” June 2006
  • Non-Patent Document 2 3GPP R1-070103, Downlink L1/L2 Control Signaling Channel Structure: Coding
  • Non-Patent Document 3 3GPP TR 36.211 (V0.2.2), “Physical Channel and Modulation”, November 2006
  • Non-Patent Document 4 3GPP R1-074580 “PHICH
  • An object of the present invention is to improve the transmission efficiency and the received quality of the Acknowledgement/Non-Acknowledgement information (ACK/NACK) indicating whether the uplink signal is required to be retransmitted.
  • ACK/NACK Acknowledgement/Non-Acknowledgement information
  • a mobile communication system having a base station apparatus and a user equipment (UE) terminal wirelessly communicating with the base station apparatus.
  • UE user equipment
  • the base station includes a providing unit providing Acknowledgement/Non-Acknowledgement information indicating whether retransmission of a signal received in uplink is required; a mapping unit mapping a number of multiplexed users of the Acknowledgement/Non-Acknowledgement information to the I-channel or the Q-channel based on a predetermined mapping table; and a reporting unit reporting the Acknowledgement/Non-Acknowledgement information to the respective users.
  • mapping table indicates that, when the number of the multiplexed users is equal to or less than a predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with either the I-channel or the Q-channel, and when the number of the multiplexed users exceeds the predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel and the Q-channel.
  • ACK/NACK Acknowledgement/Non-Acknowledgement information
  • FIG. 1 is a drawing showing an example of mapping of a downlink signal
  • FIG. 2 is a drawing showing a state where the ACK/NACKs of four users are mapped only to the I-channel;
  • FIG. 3 is a drawing showing a state where the ACK/NACKs of eight users are mapped to the I-channel and the Q-channel;
  • FIG. 4 is a drawing showing a state where the orthogonality between the I-channel and the Q-channel is precisely maintained
  • FIG. 5 is a drawing showing a state where interference arises between the I-channel and the Q-channel;
  • FIG. 6 is a sequential diagram showing an exemplary process according to an embodiment of the present invention.
  • FIG. 7 is a drawing showing an example of allocation of resource blocks in uplink
  • FIG. 8 is a drawing showing a corresponding relationship between PHICH- 1 ⁇ 16 and orthogonal modulation components
  • FIG. 9 is a drawing showing an example of an appropriate mapping position of the PHICH when the mapping position of a control channel is used.
  • FIG. 10 is a drawing showing an example of an inappropriate mapping position of the PHICH when the mapping position of control channel is used
  • FIG. 11 is a drawing showing another example of the allocation of the resource blocks in uplink.
  • FIG. 12 is drawing showing another corresponding relationship between PHICH- 1 ⁇ 16 and orthogonal modulation components
  • FIG. 13 is a drawing showing an example of an appropriate mapping position of the PHICH when the mapping position of the resource blocks is used;
  • FIG. 14 is a drawing showing an example where the PHICHs of 16 users are mapped in three different orders
  • FIG. 15 is a partial block diagram of a base station apparatus according to an embodiment of the present invention.
  • FIG. 16 is a partial block diagram of a user equipment (UE) terminal according to an embodiment of the present invention.
  • a base station apparatus used in a mobile communication system in which at least a shared data channel is transmitted by an orthogonal modulation scheme using an I-channel and a Q-channel.
  • the base station apparatus includes a providing unit providing Acknowledgement/Non-Acknowledgement information indicating whether retransmission of a signal received in uplink is required; a mapping unit mapping a number of multiplexed users of the Acknowledgement/Non-Acknowledgement information to the I-channel or the Q-channel based on a predetermined mapping table; and a reporting unit reporting the Acknowledgement/Non-Acknowledgement information to the respective users.
  • the mapping table indicates that, when the number of the multiplexed users is equal to or less than a predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with either the I-channel or the Q-channel, and when the number of the multiplexed users exceeds the predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel and the Q-channel.
  • the Acknowledgement/Non-Acknowledgement information is associated with either the I-channel or the Q-channel. By doing in this way, it may become possible to improve the transmission efficiency and the received quality of the Acknowledgement/Non-Acknowledgement information when compared with a case where the Acknowledgement/Non-Acknowledgement information is associated with the I-channel and the Q-channel.
  • the base station apparatus may further include a scheduler providing allocation information of uplink resource blocks for each user. Further, a mapping position of the allocation information of each user in a downlink control signal may be uniquely associated with a mapping position of the Acknowledgement/Non-Acknowledgement information of the user in the I-channel or the Q-channel. This configuration may be preferable from the viewpoint of simplifying a corresponding relationship between the users and the mapping positions of the Acknowledgement/Non-Acknowledgement information without accompanying (transmitting) the respective explicit user IDs with the Acknowledgement/Non-Acknowledgement information.
  • a resource block allocated to an uplink shared channel of a user may be uniquely associated with a mapping position of the Acknowledgement/Non-Acknowledgement information of the user in the I-channel or the Q-channel.
  • This configuration may also be preferable because the corresponding relationship between the users and the mapping positions of the Acknowledgement/Non-Acknowledgement information may be directly determined based on the positions of the resource blocks.
  • a number of resource blocks allocated to the users in uplink is restricted to an even number.
  • This configuration may be preferable because odd-numbered or even numbered mapping positions may be simply allocated to only one of the two orthogonal modulation components.
  • a group having a number of the Acknowledgement/Non-Acknowledgement information may be repeatedly (separately) transmitted over different frequencies including a first frequency and a second frequency within a same sub-frame, the number being equal to or less than the predetermined number, in a manner such that mapping orders of at least two of the Acknowledgement/Non-Acknowledgement information mapped to the I-channel or the Q-channel are different from each other between the group transmitted over the first frequency and the group transmitted over the second frequency.
  • This configuration may be preferable from the viewpoint of promoting the randomization of the interference.
  • the Acknowledgement/Non-Acknowledgement information of the users may be spread using a predetermined spreading factor, and spread Acknowledgement/Non-Acknowledgement information of plural users may be code division multiplexed in the same frequency.
  • a method used in a base station apparatus for a mobile communication system in which at least a shared data channel is transmitted by the orthogonal modulation scheme using the I-channel and the Q-channel.
  • the method includes a providing step of providing Acknowledgement/Non-Acknowledgement information indicating whether retransmission of a signal received in uplink is required; a mapping step of mapping a number of multiplexed users of the Acknowledgement/Non-Acknowledgement information to the I-channel or the Q-channel based on a predetermined mapping table; and a reporting step of reporting the Acknowledgement/Non-Acknowledgement information to the respective users.
  • the mapping table indicates that, when a number of multiplexed users is equal to or less than a predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with either the I-channel or the Q-channel, and when the number of the multiplexed users exceeds the predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel and the Q-channel.
  • a user equipment terminal used in a mobile communication system in which at least a shared data channel is transmitted by the orthogonal modulation scheme using the I-channel and the Q-channel.
  • the user equipment terminal includes a demodulation unit demodulating a downlink control signal including allocation information of uplink resource blocks; a transmission unit transmitting an uplink shared channel based on the allocation information; and an extraction unit extracting Acknowledgement/Non-Acknowledgement information from the downlink control signal based on a predetermined mapping table, the Acknowledgement/Non-Acknowledgement information indicating whether retransmission of the shared data channel is required.
  • the mapping table indicates that, when a number of multiplexed users in the downlink control signal is equal to or less than a predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with either the I-channel or the Q-channel, and when the number of the multiplexed users exceeds the predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel and the Q-channel.
  • a method used in a user equipment terminal for a mobile communication system in which at least a shared data channel is transmitted by the orthogonal modulation scheme using the I-channel and the Q-channel.
  • the method includes a demodulating step of demodulating a downlink control signal including allocation information of uplink resource blocks; a transmitting step of transmitting an uplink shared channel based on the allocation information; and an extracting step of extracting Acknowledgement/Non-Acknowledgement information from the downlink control signal based on a predetermined mapping table, the Acknowledgement/Non-Acknowledgement information indicating whether retransmission of the shared data channel is required.
  • the mapping table indicates that, when a number of multiplexed users in the downlink control signal is equal to or less than a predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with either the I-channel or the Q-channel, and when the number of the multiplexed users exceeds the predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel and the Q-channel.
  • FIG. 6 is a sequence diagram showing an exemplary operation according to an embodiment of the present invention.
  • the base station eNB performs a scheduling process to allocate radio resources in downlink and uplink.
  • the information indicating how the radio resources are allocated in downlink and uplink is indicated in the Downlink Scheduling Information and the Uplink Scheduling Grant, respectively.
  • the Downlink Scheduling Information and the Uplink Scheduling Grant are included in the Physical Downlink Control CHannel (PDCCH).
  • PDCH Physical Downlink Control CHannel
  • a mobile communication system using the SC-FDMA scheme in uplink is used. Therefore, when plural resource blocks are allocated to a single user, the scheduling process is controlled in a manner such that the plural resource blocks occupy consecutive frequency bands.
  • a multi-carrier scheme such as the OFDM scheme is used, such control is not required.
  • step S 2 the base station apparatus (eNB) transmits a downlink control signal and the Physical Downlink Shared CHannel (PDSCH) to the user equipment (UE) terminal, the downlink control signal including at least the PCFICH and the PDCCH.
  • eNB the base station apparatus
  • PDSCH Physical Downlink Shared CHannel
  • step S 3 the user equipment (UE) terminal demodulates the downlink control signal.
  • PCFICH Physical Control Format Indicator CHannel
  • the user equipment (UE) terminal detects, for example, the number of OFDM symbols allocated to the PDSCH within one sub-frame, and which is the first OFDM symbol of the OFDM symbols allocated to the PDSCH and the like.
  • the user equipment (UE) terminal determines whether the PDSCH addressed to the user equipment (UE) terminal is included in the received PDCCHs.
  • the PDCCHs of plural users are multiplexed in the downlink control signal.
  • the number of multiplexed users is expressed as “N” so that N PDCCHs are expressed by PDCCH- 1 , PDCCH-N.
  • the downlink control signal includes N PDCCH information blocks.
  • any of the N information locks is the PDCCH addressed to the user equipment (UE) terminal.
  • the user equipment (UE) terminal sequentially demodulates from the first information block of the N information blocks.
  • the user equipment (UE) terminal may determine whether the PDSCH addressed to the user equipment (UE) terminal is included by determining, for example, the user ID convolved in the CRC for the information blocks.
  • the user equipment (UE) extracts the scheduling information addressed to the user equipment (UE) terminal from the information block PDCCH-x.
  • no resource blocks are allocated to the user equipment (UE) terminal.
  • PDCCH- 1 UE-A; RB 1 ; 4
  • PDCCH- 2 UE-B; RB 5 ; 5
  • PDCCH- 3 UE-C; RB 10 ; 2
  • PDCCH- 4 UE-D; RB 12 ; 3
  • PDCCH- 5 UE-E; RB 15 ; 2
  • RB 1 through RB 4 are allocated to the user equipment (UE) A (UE-A).
  • RB 5 through RB 9 are allocated to the user equipment (UE) B (UE-B).
  • Two resource blocks RB 10 and RB 11 are allocated to the user equipment (UE) C (UE-C).
  • Three resource blocks RB 12 through RB 14 are allocated to the user equipment (UE) D (UE-D).
  • UE-D user equipment
  • Two resource blocks RB 15 and RB 16 are allocated to the user equipment (UE) E (UE-E).
  • step S 4 of FIG. 6 the user equipment (UE) terminals transmit the Physical Uplink Shared Channel (PUSCH) using the respective resource blocks based on the Uplink Scheduling Information.
  • PUSCH Physical Uplink Shared Channel
  • the base station apparatus receives the PUSCHs from the user equipment (UE) terminals and determines whether the retransmission is required for each PUSCH. Whether the retransmission is required may be determined based on, for example, an error detection result of the PUSCH.
  • the base station apparatus (eNB) provides Acknowledgement information (ACK).
  • ACK Acknowledgement information
  • NACK Non-Acknowledgement information
  • the Acknowledgement/Non-Acknowledgement information (ACK/NACK) is provided for each user having transmitted the PUSCH.
  • the Acknowledgement/Non-Acknowledgement information is reported to each user as a Physical Hybrid Indicator CHannel (PHICH) in the downlink control signal.
  • PHICH Physical Hybrid Indicator CHannel
  • five users (user equipment (UE) terminals) transmit the PUSCH; therefore, the Acknowledgement/Non-Acknowledgement information (ACK/NACK) for each of the five users is provided.
  • those PHICHs are expressed as PHICH- 1 , PHICH- 2 , . . . , and PHICH- 5 . Therefore, the PHICHs of five users are included in the downlink control signal.
  • each user user equipment (UE) terminal
  • UE user equipment
  • the PHICH- 1 ⁇ 5 accompany the respective user identification information.
  • this may not be preferable from the viewpoint of the transmission efficiency of information.
  • the mapping of the PHICH in the downlink control signal is well arranged so that the user equipment (UE) terminal can appropriately extract the PHICH addressed to the user equipment (UE) terminal.
  • step S 6 the PHICH- 1 ⁇ 5 of the users are mapped to the downlink control signal based on a predetermined mapping table.
  • the corresponding relationship between the PHICH- 1 ⁇ 5 and the UE-A ⁇ E is specified via the PDCCH- 1 ⁇ 5 .
  • the information of the UE-A is included in the first information block (PDCCH- 1 ); therefore, the PHICH addressed to the UE-A corresponds to the first PHICH (PHICH- 1 ).
  • the information of the UE-B is included in the second information block (PDCCH- 2 ); therefore, the PHICH addressed to the UE-B corresponds to the second PHICH (PHICH- 2 ).
  • the PHICHs of the users are mapped to only the I-channel.
  • the predetermined number of the PHICHs are mapped to the I-channel, and the rest of the PHICHs are mapped to the Q-channel.
  • the predetermine number is half of the maximum number of multiplexed users that can transmit the respective PUSCHs at the same time.
  • FIG. 8 schematically shows a state where the PHICH- 1 ⁇ 8 are mapped to the I-channel and the PHICH- 9 ⁇ 16 are mapped to the Q-channel.
  • the number (16) of the resource blocks is equal to the maximum number of multiplexed users (16) of the PHICHs.
  • the present invention is not limited to this configuration as long as the maximum number of multiplexed users of the PUSCHs is equal to the maximum number of multiplexed users of the PHICHs.
  • FIG. 9 shows an example how the PHICH- 1 ⁇ 16 in FIG. 8 are associated with the I-channel and the Q-channel.
  • the PHICH- 1 ⁇ 4 are code division multiplexed on four sub-carriers 1 ⁇ 4
  • PHICH- 5 ⁇ 8 are code division multiplexed on other four sub-carriers 5 ⁇ 8 ; and all the PHICH- 1 ⁇ 8 are mapped to the I-channel.
  • the PHICH- 9 ⁇ 12 are code division multiplexed on four sub-carriers 1 ⁇ 4
  • PHICH- 13 ⁇ 16 are code division multiplexed on other four sub-carriers 5 ⁇ 8 ; but all the PHICH- 9 ⁇ 16 are mapped to the Q-channel.
  • the number of multiplexed users is equal to or less than eight. In such a case, eight or less PHICHs are mapped only to the I-channel. Therefore, in this case, the Q-channel is not used.
  • each “spot” (place to be allocated) uniquely specifies whether the I-channel or the Q-channel is used, which of the four parts of the Spreading Factor (SF) is used, and which of the sub-carriers 1 ⁇ 4 and 5 ⁇ 8 are used.
  • SF Spreading Factor
  • the maximum number of multiplexed users is 16. However, any other appropriate number may alternatively be used.
  • the system provides the mapping patterns of the PHICHs for the maximum number of multiplexed users and that all of the mapping patterns are stored in all the user equipment (UE) terminals in advance.
  • the maximum number of multiplexed users is reported using broadcast information or the like. Therefore, by reading the broadcast information, the user equipment (UE) determines which mapping pattern is used in the cell where the user equipment (UE) terminal is located.
  • step S 7 of FIG. 6 the PHICHs (in the above case, PHICH- 1 ⁇ 5 ) mapped to the spots as shown in FIG. 9 are transmitted to the respective users.
  • each user equipment (UE) terminal reads the PHICH related (addressed) to the user equipment (UE) terminal from the downlink control signal.
  • the downlink control signal in this case includes not only the PCFICH and the PDCCH but also the PHICH.
  • Each user equipment (UE) terminal has detected the mapping position of the PDCCH addressed to the user equipment (UE) terminal in step S 3 .
  • the Acknowledgement/Non-Acknowledgement information (ACK/NACK) of the user has been written in the x-th PHICH (i.e., PHICH-x). Because of this feature, the user equipment (UE) terminal A (UE-A) determines whether the retransmission is required by reading the information in PHICH- 1 .
  • the user equipment (UE) terminal B determines whether the retransmission is required by reading the information in PHICH- 2 .
  • the user equipment (UE) terminal C determines whether the retransmission is required by reading the information in PHICH- 3 .
  • the user equipment (UE) terminal D determines whether the retransmission is required by reading the information in PHICH- 4 .
  • the user equipment (UE) terminal E determines whether the retransmission is required by reading the information in PHICH- 5 .
  • a not-yet-transmitted (new) PUSCH is transmitted in step S 9 .
  • the radio resources to be used for the transmission of the new PUSCH are designated in the Uplink Scheduling Grant in the PDCCH reported in step S 7 .
  • the same PUSCH transmitted in step S 4 is retransmitted in step S 9 .
  • the radio resources to be used for the retransmission may be separately determined from the case of the transmission of the new packet data, or may be reported in every retransmission case using the Uplink Scheduling Grant similar to the case of the transmission of the new packet data.
  • the mapping table may be provided so that the PHICHs may be mapped to the Q-channel first.
  • the mapping method of the PHICHs is not limited to the configuration as shown in FIG. 9 , and any other appropriate mapping method may alternatively used.
  • the above advantages may not be obtained.
  • this second operation example differs from the first operation example described above in the allocation method of resource blocks (in step S 1 ), the mapping table (in step S 6 ), and the process performed by the user equipment (UE) terminal (in step S 8 ).
  • step S 1 the base station (eNB) performs a scheduling process to allocate radio resources in downlink and uplink.
  • a mobile communication system using the SC-FDMA scheme in uplink is used. Therefore, when plural resource blocks are allocated to a single user, the scheduling process is controlled so that the plural resource blocks occupy consecutive frequency bands.
  • the number of resource blocks to be allocated to the users may be any of an odd number and an even number.
  • this process in which the number of the resource blocks is restricted or not depending on the number of multiplexed users largely differs from that in the first operation example.
  • step S 2 the base station apparatus (eNB) transmits a downlink control signal and the Physical Downlink Shared CHannel (PDSCH) to the user equipment (UE) terminal, the downlink control signal including at least the PCFICH and the PDCCH.
  • eNB the base station apparatus
  • PDSCH Physical Downlink Shared CHannel
  • step S 3 the user equipment (UE) terminal demodulates the downlink control signal.
  • the user equipment (UE) terminal determines whether the PDSCH addressed to the user equipment (UE) terminal is included in the received PDCCHs.
  • the user equipment (UE) terminal prepares the communication using the allocated resource blocks.
  • FIG. 11 shows an example of the allocation of the uplink resource blocks designated by the PDCCH.
  • the number of multiplexed users (UE-A ⁇ E) is five which is less than eight (which is the half of the maximum number of multiplexed users) (5 ⁇ 8). Therefore, the number of resource blocks to be allocated to the users is restricted to an even number.
  • RB 1 through RB 4 are allocated to the user equipment (UE) terminal A (UE-A).
  • RB 5 through RB 8 are allocated to the user equipment (UE) B (UE-B).
  • Two resource blocks RB 9 and RB 10 are allocated to the user equipment (UE) C (UE-C).
  • RB 11 through RB 14 are allocated to the user equipment (UE) D (UE-D).
  • UE-D user equipment
  • Two resource blocks RB 15 and RB 16 are allocated to the user equipment (UE) E (UE-E).
  • step S 4 the user equipment (UE) terminals transmit the Physical Uplink Shared Channels (PUSCHs) using the resource blocks as shown in FIG. 11 based on the Uplink Scheduling Information.
  • PUSCHs Physical Uplink Shared Channels
  • step S 5 the base station apparatus (eNB) receives the PUSCHs from the user equipment (UE) terminals and determines whether the retransmission is required for each PUSCH. Whether the retransmission is required may be determined based on, for example, an error detection result of the PUSCH.
  • the base station apparatus (eNB) provides Acknowledgement information (ACK).
  • ACK Acknowledgement information
  • NACK Non-Acknowledgement information
  • the Acknowledgement/Non-Acknowledgement information (ACK/NACK) is provided for each user having transmitted the PUSCH.
  • five users (user equipment (UE) terminals) transmit the PUSCH; therefore, the Acknowledgement/Non-Acknowledgement information (ACK/NACK) for each of the five users is provided.
  • UE user equipment
  • step S 6 the PHICHs of the users are mapped to the downlink control signal based on a predetermined mapping table.
  • the corresponding relationship between the PHICHs of the five users and the UE-A ⁇ E is distinguished by the resource blocks of the Physical Uplink Shared Channel (PUSCH).
  • PUSCH Physical Uplink Shared Channel
  • this second operation example differs from the first operation example.
  • the resource blocks are allocated as shown in FIG. 11 .
  • the spots (places to be allocated) for the PHICHs may be secured up to the total amount of the resource blocks.
  • the resource blocks from RB 1 are sequentially allocated to the UE-A; therefore, the Acknowledgement/Non-Acknowledgement information (ACK/NACK) of the UE-A is written into the first spot of the PHICH (i.e., PHICH- 1 ).
  • the resource blocks from RB 5 are sequentially allocated to the UE-B; therefore, the Acknowledgement/Non-Acknowledgement information (ACK/NACK) of the UE-B is written into the fifth spot of the PHICH (i.e., PHICH- 5 ).
  • the Acknowledgement/Non-Acknowledgement information (ACK/NACK) of the UE-C is written into the ninth spot of the PHICH (i.e., PHICH- 9 ).
  • the Acknowledgement/Non-Acknowledgement information (ACK/NACK) of the UE-D is written into the eleventh spot of the PHICH (i.e., PHICH- 11 ).
  • the Acknowledgement/Non-Acknowledgement information (ACK/NACK) of the UE-E is written into the fifteenth spot of the PHICH (i.e., PHICH- 15 .
  • FIG. 12 shows a corresponding relationship between the spots of the PHICHs and the orthogonal modulation components.
  • odd-numbered PHICHs are mapped to the I-channel and even-numbered PHICHs are mapped to the Q-channel.
  • the number of multiplexed users is equal to or less than eight and accordingly an even number of the resource blocks are always allocated, an even number of the resource blocks starting from an odd-numbered resource block is always allocated to the users.
  • the resource blocks starting from the first, the fifth, the ninth, the eleventh, and the fifteenth resource blocks are allocated. Therefore, by setting the above-described arrangement as shown in FIG. 12 , it may become possible to map all the PHICHs of the users to the I-channel only.
  • FIG. 13 shows an example how the PHICH- 1 ⁇ 16 in FIG. 12 are associated with the I-channel and the Q-channel.
  • the PHICH- 1 , PHICH- 3 , PHICH- 5 , and PHICH- 7 are code division multiplexed on four sub-carriers 1 ⁇ 4
  • PHICH- 9 , PHICH- 11 , PHICH- 13 , and PHICH- 15 are code division multiplexed on other four sub-carriers 5 ⁇ 8 ; and all the PHICHs are mapped to the I-channel.
  • the PHICH- 2 , PHICH- 4 , PHICH- 6 , and PHICH- 8 are code division multiplexed on four sub-carriers 1 ⁇ 4
  • PHICH- 10 , PHICH- 12 , PHICH- 14 , and PHICH- 16 are code division multiplexed on other four sub-carriers 5 ⁇ 8 ; but all the PHICHs are mapped to the Q-channel.
  • PHICHs In practical communications, however, as many as 16 PHICHs may not be always necessary. There may be a case where the number of multiplexed users is equal to or less than eight. In such a case, eight or less PHICHs are mapped only to the I-channel. Therefore, in this case, the Q-channel is not used. In the present example, there are provided five PHICHs, and those PHICHs are mapped to spots # 1 , # 5 , # 9 , # 11 , and # 15 and only the I-channel is used.
  • each “spot” uniquely specifies whether the I-channel or the Q-channel is used, which of the four parts of the Spreading Factor (SF) is used, and which of the sub-carriers 1 ⁇ 4 and 5 ⁇ 8 is used.
  • SF Spreading Factor
  • the maximum number of multiplexed users is 16.
  • any other appropriate number may alternatively be used.
  • the resource blocks are distinguished by using the numbers 1 through 16.
  • the resource blocks may be distinguished by using the numbers 0 through 15.
  • the relationships using the odd numbers and the even numbers described above should be reversed.
  • the number of resource blocks to be allocated to the users is restricted to an even number when determining that the number of multiplexed users is equal to or less than a predetermined number.
  • the odd numbers and the even numbers are associated with the I-channel and the Q-channel, respectively.
  • the odd numbers and the even numbers may be associated with the Q-channel and the I-channel, respectively.
  • FIG. 9 it is expected (assumed) that a predetermined number of consecutive numbers are mapped only to one of the two orthogonal modulation components, and actually, the same number of PHICHs as the number of multiplexed users are mapped in the increasing order (see FIG. 9 ).
  • FIG. 13 it is expected (assumed) that a predetermined number of alternate numbers are mapped only to one of the two orthogonal modulation components. Therefore, in an actual case, it should be noted that the same number of PHICHs as the number of multiplexed users may not necessarily be mapped in a consecutive order (as shown in FIG. 13 ).
  • step S 7 the PHICHs (in the above case, PHICH- 1 , PHICH- 5 , PHICH- 9 , PHICH- 11 , and PHICH- 15 ) mapped to the spots as shown in FIG. 13 are transmitted to the respective users.
  • each user equipment (UE) terminal reads the PHICH related (addressed) to the user equipment (UE) terminal from the downlink control signal.
  • the downlink control signal in this case includes not only the PCFICH and the PDCCH but also the PHICH.
  • Each user equipment (UE) terminal has detected which resource block is used to transmit the PUSCH in step S 4 .
  • the Acknowledgement/Non-Acknowledgement information (ACK/NACK) of the user is written in the x-th PHICH (i.e., PHICH-x). Because of this feature, the user equipment (UE) terminal (UE-A) determines whether the retransmission is required by reading the information in PHICH- 1 .
  • the user equipment (UE) terminal (UE-B) determines whether the retransmission is required by reading the information in PHICH- 5 .
  • the user equipment (UE) terminal (UE-C) determines whether the retransmission is required by reading the information in PHICH- 9 .
  • the user equipment (UE) terminal (UE-D) determines whether the retransmission is required by reading the information in PHICH- 11 .
  • the user equipment (UE) terminal (UE-E) determines whether the retransmission is required by reading the information in PHICH- 15 .
  • a not-yet-transmitted (new) PUSCH is transmitted in step S 9 .
  • the radio resource to be used for the transmission of the new PUSCH is designated in the Uplink Scheduling Grant in the PDCCH reported in step S 7 .
  • the same PUSCH transmitted in step S 4 is retransmitted in step S 9 .
  • the radio resource to be used for the retransmission may be separately determined from the case of the transmission of the new packet data, or may be reported in every retransmission case using the Uplink Scheduling Grant similar to the transmission of the new packet data.
  • the PHICHs of the four users are mapped to three different regions on the frequency axis, and transmitted at the same time using different respective frequencies.
  • SF Spreading Factor
  • the allocation order of the PHICHs within one region (group) may be the same as that within two other regions (groups).
  • the allocation order of the PHICHs within one region (group) among the three regions (groups) may be different from each other. From the viewpoint of improving the reliability, it may be preferable to variably change the allocation order of the PHICHs among the regions (groups).
  • FIG. 14 shows an example where the allocation spots of the PHICHs of the sixteen users are different from each other among three different regions on the frequency axis. When the orthogonality is disturbed, the interference especially within the same frequency region is likely to increase.
  • the interference especially between the spots # 1 , # 2 , # 3 , and # 4 and the spots # 9 , # 10 , # 11 , and # 12 and between the spots # 5 , # 6 , # 7 , and # 8 and the spots # 13 , # 14 , # 15 , and # 16 are likely to increase.
  • the interference especially between the spots # 1 , # 3 , # 5 , and # 7 and the spots # 9 , # 11 , # 13 , and # 15 and between the spots # 2 , # 4 , # 6 , and # 8 and the spots # 10 , # 12 , # 14 , and # 16 are likely to increase.
  • the interference especially between the spots # 1 , # 6 , # 3 , and # 8 and the spots # 9 , # 14 , # 11 , and # 16 and between the spots # 5 , # 2 , # 7 , and # 4 and the spots # 13 , # 10 , # 15 , and # 12 are likely to increase.
  • the combination of the spots where the interference increases differs among those three groups (regions). Because of this feature, by changing the allocation order as described above, when disturbance of orthogonality causes the interference, the interference may be randomized; thereby better controlling to some extent the degradation of the quality of the PHHICHs caused by disturbance of orthogonality.
  • the numbers # 1 through # 8 belong to the I-channel and the numbers # 9 through # 16 belong to the Q-channel.
  • the allocation order may be changed among the I-channel and the Q-channel without a restriction to be changed within the I-channel or the Q-channel only in each of the three groups (regions).
  • the allocation order be changed within one of the two orthogonal modulation components only. Further, in the example of FIG. 14 , consecutive numbers # 1 through # 8 are allocated to the I-channel. However, when the second operation example is to be applied to this example, the numbers # 1 through # 8 may be replaced by eight odd numbers and the numbers # 9 through # 16 may be replaced by eight even numbers.
  • FIG. 15 is a partial functional block diagram of the base station apparatus (eNB) according to an embodiment of the present invention.
  • the base station apparatus (eNB) includes a scheduler 10 , a PDCCH generation section 11 , a PDICH generation section 12 , a PCFICH generation section 13 , a control channel mapping section 14 , a mapping table 15 , a PDSCH generation section 16 , and a multiplex section 17 .
  • the scheduler 10 performs the scheduling process to determine the schedule of the allocation of the uplink and downlink radio resources.
  • the scheduling process may be performed depending on the radio propagation status and the like.
  • the radio propagation status may be measured based on the downlink CQIs reported from the user equipment (UE) terminals, the SINR (Signal-to-Interference and Noise power Ratio) measured in uplink and the like. Further, the radio propagation status may influence the error detection result; therefore, the error detection result may further be considered in the scheduling process.
  • the PDCCH generation section 11 generates the Physical Downlink Control CHannel (PDCCH) including information items such as the Downlink Scheduling Information and the Uplink Scheduling Grant.
  • PDCCH Physical Downlink Control CHannel
  • the PHICH generation section 12 provides the Acknowledgement/Non-Acknowledgement information (ACK/NACK) to be transmitted to each user having transmitted the Physical Uplink Shared CHannel (PUSCH).
  • the Acknowledgement/Non-Acknowledgement information (ACK/NACK) is expressed in either the Non-Acknowledgement information (NACK) which requests for the retransmission of the PUSCH or the Acknowledgement information (ACK) which does not request for the retransmission of the PUSCH.
  • the PHICHs of the users are code spread using a predetermined Spreading Factor (SF).
  • the PCFICH generation section 13 indicates the number of OFDM symbols used for the PDCCH within the sub-frames. Typically, the number of the OFDM symbols is one, two, or three and varies depending on the number of multiplexed users.
  • the control channel mapping section 14 maps the downlink control signal on an appropriate frequency, the downlink control signal including the PDCCH, the PHICH, the PCFICH and the like. As described above, the PHICHs of a predetermined number of the users are code division multiplexed on the same sub-carriers.
  • the mapping table 15 indicates how the PHICHs of the users are associated with the I-channel and/or the Q-channel.
  • the PDSCH generation section 16 provides the Physical Downlink Shared CHannel (PDSCH).
  • PDSCH Physical Downlink Shared CHannel
  • the multiplex section 17 multiplexes the downlink control channel and the PDSCH, and transmits the multiplexed signal to a downlink signal generation section (not shown) provided on the downstream side thereof.
  • the downlink signal generation section generates the transmission symbols modulated by the OFDM scheme.
  • the multiplex section 17 further multiplexes a reference signal on an as-needed basis.
  • FIG. 16 is a partial functional block diagram of the user equipment (UE) terminal according to an embodiment of the present invention.
  • the user equipment (UE) terminal includes a signal separation section 20 , a PDCCH demodulation section 21 , a PHICH demodulation section 22 , a mapping table 23 , and a PUSCH generation section 24 .
  • the signal separation section 20 appropriately separates the reference signal, the control channel, the Physical Downlink Shared CHannel (PDSCH) and the like from a received baseband signal.
  • PDSCH Physical Downlink Shared CHannel
  • the PDCCH demodulation section 21 specifies the number of OFDM symbols used for the PDCCH by reading the PCFICH.
  • the PDCCH demodulation section 21 demodulates the PDCCHs to determine whether the PDCCH addressed to the user equipment (UE) terminal is included in the demodulated PDCCHs.
  • the PDCCH demodulation section 21 stores the information indicating the order (x) of the PDCCH (x-th PDCCH) in the number of multiplexed users (this process is required in the first operation example but is not necessarily required in the second operation example).
  • the radio resources usable for the PUSCH and/or the PDSCH are specified.
  • the PHICH demodulation section 22 reads the PHICH relevant to the user equipment (UE) terminal, and determines whether the user equipment (UE) terminal is required to retransmit the PUSCH transmitted before.
  • the user equipment (UE) terminal specifies and reads the PHICH addressed to the user equipment (UE) terminal using the mapping table 23 .
  • the user equipment (UE) terminal specifies the PHICH addressed to the user equipment (UE) terminal based on the mapping position of the PDCCH having been transmitted before and included the scheduling information of the PUSCH having been transmitted before.
  • the user equipment (UE) terminal specifies the PHICH addressed to the user equipment (UE) terminal based on the number (identification number) of the resource block of the PUSCH having been transmitted before.
  • the PUSCH generation section 24 provides the Physical Uplink Shared CHannel (PUSCH).
  • PUSCH Physical Uplink Shared CHannel
  • not-yet-transmitted (new) packet data uplink traffic data
  • the PUSCH is transmitted to a transmission section (not shown).
  • the packet data to be retransmitted are provided again as the PUSCH and transmitted to the transmission section.
  • the apparatus according to an embodiment of the present invention is described with reference to the functional block diagram.
  • such an apparatus may be provided by hardware, software, or a combination thereof.
  • the present invention is not limited to the embodiment described above, and various modifications, transformations, alteration, exchanges, and the like may be made without departing from the scope and spirit from the present invention.

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EP2242193A1 (de) 2010-10-20
US20140086170A1 (en) 2014-03-27
WO2009087926A1 (ja) 2009-07-16
EP3094025A1 (de) 2016-11-16
US10256960B2 (en) 2019-04-09
JP2009164976A (ja) 2009-07-23
KR20100113541A (ko) 2010-10-21
CN103701750B (zh) 2017-08-04
CN101960756B (zh) 2014-03-12

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