WO2012173385A2 - Procédé et appareil pour allouer une ressource dans un système de communication sans fil - Google Patents

Procédé et appareil pour allouer une ressource dans un système de communication sans fil Download PDF

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Publication number
WO2012173385A2
WO2012173385A2 PCT/KR2012/004650 KR2012004650W WO2012173385A2 WO 2012173385 A2 WO2012173385 A2 WO 2012173385A2 KR 2012004650 W KR2012004650 W KR 2012004650W WO 2012173385 A2 WO2012173385 A2 WO 2012173385A2
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Prior art keywords
resource allocation
resource
terminal
partition
information
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PCT/KR2012/004650
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English (en)
Korean (ko)
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WO2012173385A3 (fr
Inventor
서동연
안준기
양석철
김민규
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엘지전자 주식회사
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Publication of WO2012173385A3 publication Critical patent/WO2012173385A3/fr

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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
    • H04L5/0001—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • 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

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for allocating resources in a wireless communication system.
  • LTE 3rd Generation Partnership Project
  • 3GPP 3rd Generation Partnership Project
  • LTE log term term evolution
  • a resource block is used as a resource allocation unit when allocating resources for a terminal.
  • a resource block is composed of seven or six orthogonal frequency division multiplexing (OFDM) symbols consecutive in the time domain and 12 subcarriers in the frequency domain.
  • OFDM orthogonal frequency division multiplexing
  • LTE-A long term evolution-advanced, LTE-A
  • LTE-A long term evolution-advanced, LTE-A
  • LTE-A can support low-cost and low-end devices that mainly perform data communication, such as meter reading, water level measurement, surveillance camera utilization, and inventory reporting on vending machines.
  • a low cost / low specification terminal mainly for low capacity data communication is referred to as a machine type communication (MTC) terminal.
  • MTC machine type communication
  • the MTC terminal Since the MTC terminal has a small amount of transmission data, unnecessary resource waste may occur when resource allocation is performed on a resource block basis which is a conventional resource allocation unit. In addition, since the MTC terminal has a large number of terminals operating in one cell, there may be insufficient resources to be allocated in some cases.
  • a resource allocation method and apparatus are provided in a wireless communication system.
  • a terminal provides a method for allocating radio resources in a wireless communication system.
  • the method includes receiving partition selection information indicating a partition within a resource block; Receiving resource allocation information; And selecting a partition indicated by the partition selection information from the resource block indicated by the resource allocation information, wherein the terminal is a second type of terminal, and the partition selection information is a resource for the first type of terminal.
  • the method may further include receiving a resource allocation mode indication, wherein the resource allocation mode indication may be any one of a resource block mode in which a resource allocation unit is a resource block or a resource block partitioning mode in which a resource allocation unit divides a resource block. You can indicate one.
  • the partition selection information may be provided as a bitmap composed of N bits when a resource block is divided into N (N is a natural number of two or more) partitions.
  • a specific value of the bit value of the N-bit bitmap may indicate the resource block mode, and a bit value excluding the specific value may indicate which one of the N partitions is used.
  • the partition selection information may be received through a radio resource control (RRC) message.
  • RRC radio resource control
  • the resource allocation information may be information for allocating a resource to the terminal using a resource block as a resource allocation unit.
  • the partition selection information may be included in the resource allocation information.
  • the partition selection information may be included by borrowing some fields from the resource allocation information.
  • the partition selection information may be determined according to a value of a 'DM-RS signal (cyclic modulation-reference signal cyclic shift)' field transmitted in the resource allocation information, and the DM-RS CS field may correspond to a reference signal transmitted by the terminal. This field indicates a cyclic shift value.
  • a 'DM-RS signal cyclic modulation-reference signal cyclic shift
  • a terminal in another aspect, includes a radio frequency (RF) unit for transmitting and receiving a radio signal; And a processor coupled to the RF unit, the processor receiving partition selection information indicating a partition in a resource block, receiving resource allocation information, and selecting the partition from a resource block indicated by the resource allocation information. Select a partition indicated by the information, wherein the partition selection information is information indicating a partition obtained by dividing a resource block which is a resource allocation unit for another type of terminal; and the processor uses the partition as a resource allocation unit It is done.
  • RF radio frequency
  • radio resources can be allocated using a resource allocation unit suitable for each terminal, thereby preventing radio resource waste and efficiently allocating radio resources.
  • FIG. 2 shows an example of a resource grid for one downlink slot.
  • 3 shows an example of a downlink subframe structure in 3GPP LTE.
  • 5 is a comparative example of a conventional single carrier system and a carrier aggregation system.
  • FIG. 6 shows bitmaps used in resource allocation types 0 and 1.
  • FIG. 7 illustrates resources that can be indicated according to the bitmap of FIG. 6.
  • FIG. 8 illustrates resource allocation via resource allocation type 2.
  • FIG. 9 shows an example of an interleaver used in the DVRB allocation method
  • FIG. 10 shows resource allocation according to the DVRB allocation method.
  • FIG. 11 illustrates a resource allocation method according to an embodiment of the present invention.
  • FIG. 14 shows an example of including partition selection information in a resource allocation field of a DCI format.
  • FIG. 16 shows an example of generating a DCI format separate from the existing DCI format.
  • FIG. 18 shows a configuration of a base station and a terminal according to an embodiment of the present invention.
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • E-UMTS Evolved-UMTS
  • E-UTRAN Evolved-Universal Terrestrial Radio Access Network
  • SCD Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • LTE-A Advanced is the evolution of LTE.
  • 3GPP LTE / LTE-A is mainly described, but the technical spirit of the present invention is not limited thereto.
  • the wireless communication system includes at least one base station (BS). Each base station provides communication services for a particular geographic area.
  • a base station generally refers to a fixed station communicating with a terminal, and may be referred to as other terms such as an evolved NodeB (eNB), a base transceiver system (BTS), an access point, an access network (AN), and the like. .
  • eNB evolved NodeB
  • BTS base transceiver system
  • AN access network
  • AN access network
  • Terminal User Equipment, UE
  • MS Mobile Station
  • UT User Terminal
  • SS Subscriber Station
  • Wireless Device Personal Digital Assistant
  • PDA Wired Modem
  • AT Access Terminal
  • downlink means communication from the base station to the terminal
  • uplink means communication from the terminal to the base station.
  • the wireless communication system may be a system supporting bidirectional communication. Bidirectional communication may be performed using a time division duplex (TDD) mode, a frequency division duplex (FDD) mode, or the like. TDD mode uses different time resources in uplink transmission and downlink transmission. The FDD mode uses different frequency resources in uplink transmission and downlink transmission.
  • TDD time division duplex
  • FDD frequency division duplex
  • the base station and the terminal may communicate with each other using a radio resource called a radio frame.
  • a radio frame consists of 10 subframes in the time domain, and one subframe consists of two slots in the time domain.
  • One subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
  • the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI may be a minimum unit of scheduling.
  • One slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain. Since 3GPP LTE uses OFDMA in downlink, one symbol period is represented by an OFDM symbol. The OFDM symbol may be called a different name according to the multiple access scheme. For example, when SC-FDMA is used as an uplink multiple access scheme, it may be referred to as an SC-FDMA symbol. An example of including 7 OFDM symbols in one slot is described as an example, but the number of OFDM symbols included in one slot may vary according to the length of a cyclic prefix (CP).
  • CP cyclic prefix
  • one subframe includes 7 OFDM symbols in a normal CP and one subframe includes 6 OFDM symbols in an extended CP.
  • the structure of the radio frame is only an example, and the number of subframes included in the radio frame and the number of slots included in the subframe may be variously changed.
  • FIG. 2 shows an example of a resource grid for one downlink slot.
  • the downlink slot includes a plurality of OFDM symbols in the time domain and includes N RB resource blocks (RBs) in the frequency domain.
  • the RB includes one slot in the time domain and a plurality of consecutive subcarriers in the frequency domain in resource allocation units.
  • the number N RB of resource blocks included in the downlink slot depends on a downlink transmission bandwidth set in a cell. For example, in the LTE system, N RB may be any one of 6 to 110.
  • the structure of the uplink slot may also be the same as that of the downlink slot.
  • the uplink slot or the downlink slot may be referred to as a slot.
  • Each element on the resource grid is called a resource element (RE).
  • one resource block is composed of 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain to include 7 ⁇ 12 resource elements, but the number of OFDM symbols and the number of subcarriers in the resource block It is not limited to this.
  • the number of OFDM symbols and the number of subcarriers can be variously changed according to the length of the CP, frequency spacing, and the like.
  • the number of subcarriers in one OFDM symbol may be selected and used among 128, 256, 512, 1024, 1536 and 2048.
  • the subframe includes two consecutive slots. Up to three OFDM symbols of the first slot in the downlink subframe are the control region to which the control channel is allocated, and the remaining OFDM symbols are the data region to which the data channel is allocated.
  • the control region includes 3 OFDM symbols.
  • control channels such as a physical downlink control channel (PDCCH), a physical control format indicator channel (PCFICH), and a physical hybrid ARQ indicator channel (PHICH) may be allocated.
  • the UE may read data transmitted through the data channel by decoding control information transmitted through the PDCCH.
  • the number of OFDM symbols included in the control region in the subframe can be known through the PCFICH.
  • the PHICH carries a hybrid automatic repeat request (HARQ) acknowledgment (ACK) / negative-acknowledgement (NACK) signal in response to uplink transmission.
  • HARQ hybrid automatic repeat request
  • ACK acknowledgment
  • NACK negative-acknowledgement
  • the PDSCH may be allocated to the data area.
  • DCI downlink control information
  • DCI may be called uplink scheduling information (called uplink grant) or downlink scheduling information (called downlink grant) or uplink power control command, control information for paging, and random access response ( Control information for indicating a RACH response is transmitted.
  • the DCI may be transmitted in a certain format, and usage may be determined according to each DCI format.
  • usage may be determined according to each DCI format.
  • the use of the DCI format can be divided as shown in the following table.
  • the PDCCH may be generated through the following process.
  • the base station adds a cyclic redundancy check (CRC) for error detection to the DCI to be sent to the terminal.
  • CRC cyclic redundancy check
  • an identifier (referred to as a Radio Network Temporary Identifier (RNTI)) is masked according to an owner or a purpose of the PDCCH. If the PDCCH is for a specific terminal, a unique identifier of the terminal allocated from the base station, for example, a C-RNTI (Cell-RNTI) may be masked to the CRC.
  • Cell-RNTI C-RNTI
  • a paging identifier for example, P-RNTI (P-RNTI) may be masked to the CRC.
  • P-RNTI P-RNTI
  • SI-RNTI System Information-RNTI
  • RA-RNTI random access-RNTI
  • coded data is generated by performing channel coding on the control information added with the CRC.
  • rate matching is performed according to a control channel element (CCE) aggregation level allocated to the PDCCH format.
  • CCE control channel element
  • the coded data is modulated to generate modulation symbols.
  • the number of modulation symbols constituting one CCE may vary depending on the CCE aggregation level (one of 1, 2, 4, and 8). Modulation symbols are mapped to physical resource elements (CCE to RE mapping).
  • blind decoding is a method of demasking a desired identifier in a cyclic redundancy check (CRC) of a received PDCCH (referred to as a candidatetae PDCCH), and checking a CRC error to determine whether the corresponding PDCCH is its control channel.
  • CRC cyclic redundancy check
  • the reason for performing blind decoding is that the UE does not know in advance which CCE aggregation level or DCI format is transmitted at which position in the control region.
  • a plurality of PDCCHs may be transmitted in one subframe, and the UE monitors the plurality of PDCCHs in every subframe.
  • monitoring means that the UE attempts to decode the PDCCH according to the PDCCH format.
  • a search space is used to reduce the burden of blind decoding.
  • the search space may be referred to as a monitoring set of the CCE for the PDCCH.
  • the UE monitors the PDCCH in the corresponding search space.
  • the search space is divided into a common search space (CSS) and a UE-specific search space (USS).
  • the common search space is a space for searching for a PDCCH having common control information.
  • the common search space may be configured with 16 CCEs up to CCE indexes 0 to 15, and supports a PDCCH having a CCE aggregation level of ⁇ 4, 8 ⁇ .
  • PDCCHs (DCI formats 0 and 1A) carrying UE specific information may also be transmitted in the common search space.
  • the UE-specific search space supports a PDCCH having a CCE aggregation level of ⁇ 1, 2, 4, 8 ⁇ .
  • the starting point of the search space is defined differently from the common search space and the terminal specific search space.
  • the starting point of the common search space is fixed regardless of the subframe, but the starting point of the UE-specific search space is for each subframe according to the terminal identifier (eg, C-RNTI), the CCE aggregation level, and / or the slot number in the radio frame. Can vary.
  • the terminal identifier eg, C-RNTI
  • the CCE aggregation level e.g, CCE aggregation level
  • / or the slot number in the radio frame Can vary.
  • the terminal specific search space and the common search space may overlap.
  • an uplink subframe may be divided into a control region and a data region in the frequency domain.
  • a physical uplink control channel (PUCCH) for transmitting uplink control information is allocated to the control region.
  • the data area is allocated a PUSCH (Physical Uplink Shared Channel) for transmitting data (in some cases, control information may also be transmitted).
  • the UE may simultaneously transmit the PUCCH and the PUSCH, or may transmit only one of the PUCCH and the PUSCH.
  • PUCCH for one UE is allocated to an RB pair in a subframe.
  • Resource blocks belonging to a resource block pair occupy different subcarriers in each of a first slot and a second slot.
  • the frequency occupied by RBs belonging to the RB pair allocated to the PUCCH is changed based on a slot boundary. This is called that the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary.
  • HARQ Hybrid Automatic Repeat reQuest
  • ACK Non-acknowledgement
  • NACK Non-acknowledgement
  • channel status information indicating the downlink channel status, for example, Channel Quality Indicator (CQI), precoding matrix on the PUCCH
  • CQI Channel Quality Indicator
  • An index PTI
  • a precoding type indicator PTI
  • RI rank indication
  • the PUSCH is mapped to an uplink shared channel (UL-SCH) which is a transport channel.
  • the uplink data transmitted on the PUSCH may be a transport block which is a data block for the UL-SCH transmitted during the TTI.
  • the transport block may include user data.
  • the uplink data may be multiplexed data.
  • the multiplexed data may be multiplexed of a transport block and channel state information for the UL-SCH.
  • channel state information multiplexed with data may include CQI, PMI, RI, and the like.
  • the uplink data may consist of channel state information only. Periodic or aperiodic channel state information may be transmitted through the PUSCH.
  • 5 is a comparative example of a conventional single carrier system and a carrier aggregation system.
  • a single carrier only one carrier is supported to the UE in uplink and downlink.
  • the bandwidth of the carrier may vary, but only one carrier is allocated to the terminal.
  • a carrier aggregation (CA) system a plurality of CCs (DL CC A to C, UL CC A to C) may be allocated to the UE. For example, three 20 MHz component carriers may be allocated to allocate a 60 MHz bandwidth to the terminal.
  • the target carrier may use the bandwidth used by the existing system as it is for backward compatibility with the existing system.
  • the 3GPP LTE system supports bandwidths of 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz, and the 3GPP LTE-A system may configure a bandwidth of 20 MHz or more using only the bandwidth of the 3GPP LTE system.
  • broadband can be configured by defining new bandwidth without using the bandwidth of the existing system.
  • the system frequency band of a wireless communication system is divided into a plurality of carrier frequencies.
  • the carrier frequency means a center frequency of a cell.
  • a cell may mean a downlink frequency resource and an uplink frequency resource.
  • the cell may mean a combination of a downlink frequency resource and an optional uplink frequency resource.
  • CA carrier aggregation
  • the terminal In order to transmit and receive packet data through a specific cell, the terminal must first complete configuration for a specific cell.
  • the configuration refers to a state in which reception of system information necessary for data transmission and reception for a corresponding cell is completed.
  • the configuration may include an overall process of receiving common physical layer parameters required for data transmission and reception, or MAC layer parameters, or parameters required for a specific operation in the RRC layer.
  • the cell in the configuration complete state may exist in an activation or deactivation state.
  • activation means that data is transmitted or received or is in a ready state.
  • the UE may monitor or receive a control channel (PDCCH) and a data channel (PDSCH) of an activated cell in order to identify resources (which may be frequency, time, etc.) allocated thereto.
  • PDCCH control channel
  • PDSCH data channel
  • Deactivation means that transmission or reception of traffic data is impossible, and measurement or transmission of minimum information is possible.
  • the terminal may receive system information (SI) required for packet reception from the deactivated cell.
  • SI system information
  • the terminal does not monitor or receive the control channel (PDCCH) and data channel (PDSCH) of the deactivated cell in order to check the resources (may be frequency, time, etc.) allocated to them.
  • PDCH control channel
  • PDSCH data channel
  • the cell may be divided into a primary cell, a secondary cell, and a serving cell.
  • the primary cell refers to a cell operating at a primary frequency, and is a cell in which the terminal performs an initial connection establishment procedure or connection reestablishment with the base station, or is indicated as a primary cell in a handover process. It means a cell.
  • the secondary cell refers to a cell operating at the secondary frequency, and is established and used to provide additional radio resources once the RRC connection is established.
  • the serving cell is configured as a primary cell when the carrier aggregation is not set or the terminal cannot provide carrier aggregation.
  • the term serving cell indicates a cell configured for the terminal and may be configured in plural.
  • One serving cell may be configured with one downlink component carrier or a pair of ⁇ downlink component carrier, uplink component carrier ⁇ .
  • the plurality of serving cells may be configured as a set consisting of one or a plurality of primary cells and all secondary cells.
  • a primary component carrier means a CC corresponding to a primary cell.
  • the PCC is a CC in which the terminal initially makes a connection (connection or RRC connection) with the base station among several CCs.
  • the PCC is a special CC that manages a connection (Connection or RRC Connection) for signaling regarding a plurality of CCs and manages UE context, which is connection information related to a terminal.
  • the PCC is connected to the terminal and always exists in the active state in the RRC connected mode.
  • the downlink component carrier corresponding to the primary cell is called a downlink primary component carrier (DL PCC), and the uplink component carrier corresponding to the primary cell is called an uplink major component carrier (UL PCC).
  • DL PCC downlink primary component carrier
  • U PCC uplink major component carrier
  • Secondary component carrier refers to a CC corresponding to the secondary cell. That is, the SCC is a CC allocated to the terminal other than the PCC, and the SCC is an extended carrier for the additional resource allocation other than the PCC and may be divided into an activated or deactivated state.
  • the downlink component carrier corresponding to the secondary cell is referred to as a DL secondary CC (DL SCC), and the uplink component carrier corresponding to the secondary cell is referred to as an uplink secondary component carrier (UL SCC).
  • DL SCC DL secondary CC
  • UL SCC uplink secondary component carrier
  • the primary cell and the secondary cell have the following characteristics.
  • the primary cell is used for transmission of the PUCCH.
  • the primary cell is always activated, while the secondary cell is a carrier that is activated / deactivated according to specific conditions.
  • RLF Radio Link Failure
  • the primary cell may be changed by a security key change or a handover procedure accompanying a RACH (Random Access CHannel) procedure.
  • NAS non-access stratum
  • the primary cell is always configured with a pair of DL PCC and UL PCC.
  • a different CC may be configured as a primary cell for each UE.
  • the primary cell can be replaced only through a handover, cell selection / cell reselection process.
  • RRC signaling may be used to transmit system information of a dedicated secondary cell.
  • the downlink component carrier may configure one serving cell, and the downlink component carrier and the uplink component carrier may be connected to configure one serving cell.
  • the serving cell is not configured with only one uplink component carrier.
  • the activation / deactivation of the component carrier is equivalent to the concept of activation / deactivation of the serving cell.
  • activation of serving cell 1 means activation of DL CC1.
  • serving cell 2 assumes that DL CC2 and UL CC2 are connected and configured, activation of serving cell 2 means activation of DL CC2 and UL CC2.
  • each component carrier may correspond to a cell.
  • the number of component carriers aggregated between the downlink and the uplink may be set differently.
  • the case where the number of downlink CCs and the number of uplink CCs are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation.
  • the size (ie bandwidth) of the CCs may be different. For example, assuming that 5 CCs are used for a 70 MHz band configuration, 5 MHz CC (carrier # 0) + 20 MHz CC (carrier # 1) + 20 MHz CC (carrier # 2) + 20 MHz CC (carrier # 3) It may be configured as + 5MHz CC (carrier # 4).
  • a plurality of component carriers (CCs), that is, a plurality of serving cells may be supported.
  • Such a carrier aggregation system may support cross-carrier scheduling.
  • Cross-carrier scheduling is a resource allocation of a PDSCH transmitted on another component carrier through a PDCCH transmitted on a specific component carrier and / or other components other than the component carrier basically linked with the specific component carrier.
  • a scheduling method for resource allocation of a PUSCH transmitted through a carrier That is, the PDCCH and the PDSCH may be transmitted through different downlink CCs, and the PUSCH may be transmitted through another uplink CC other than the uplink CC linked with the downlink CC through which the PDCCH including the UL grant is transmitted. .
  • a carrier indicator indicating a DL CC / UL CC through which a PDSCH / PUSCH for which PDCCH provides control information is transmitted is required.
  • a field including such a carrier indicator is hereinafter called a carrier indication field (CIF).
  • a carrier aggregation system supporting cross carrier scheduling may include a carrier indication field (CIF) in a conventional downlink control information (DCI) format.
  • CIF carrier indication field
  • DCI downlink control information
  • 3 bits may be extended, and the PDCCH structure may include an existing coding method, Resource allocation methods (ie, CCE-based resource mapping) can be reused.
  • a resource element is the smallest frequency-time unit to which modulation symbols of a data or control channel are mapped. If a signal is transmitted through M subcarriers in one OFDM symbol and N OFMD symbols are transmitted in one subframe, M X N REs exist in one subframe.
  • a physical resource block is a resource allocation unit for transmitting data.
  • One PRB consists of consecutive REs in the frequency-time domain, and a plurality of PRBs are defined in one subframe.
  • VRB virtual resource block
  • the number of REs included in one VRB is the same as the number of REs included in one PRB.
  • one VRB may be mapped to one PRB or may be mapped to some regions of the plurality of PRBs.
  • LVRB Localized virtual resource block
  • a distributed virtual resource block is a type of VRB.
  • One DVRB is mapped to some REs in a plurality of PRBs, and REs mapped to different DVRBs are not duplicated.
  • N PRBs represents the number of PRBs in the system.
  • N LVRB represents the number of LVRBs available in the system.
  • N DVRB indicates the number of DVRBs available in the system.
  • N LVRB_UE represents the maximum number of LVRBs allocated to one UE.
  • N DVRB_UE represents the maximum number of DVRBs allocated to one UE.
  • N subset represents the number of subsets.
  • a bitmap including N PRB bits per UE to be scheduled may be used to schedule N PRB PRBs of a system in PRB units.
  • the bit number of the bitmap is excessively increased, which increases the overhead.
  • 3GPP LTE provides the following resource allocation types 0, 1, and 2 in order to prevent the overhead of the bitmap.
  • Resource allocation type 0 is a method of allocating a resource block group (RBG), which is a set of consecutive PRBs, to a UE through a bitmap. That is, in resource allocation type 0, the resource allocation unit becomes RBG instead of one resource block.
  • the size of the RBG (denoted P), that is, the number of resource blocks constituting the RBG is determined depending on the system band.
  • Resource allocation type 0 may also be referred to as an RBG scheme.
  • Resource allocation type 1 is a method of allocating resources to UEs in PRB units within a subset through a bitmap.
  • the subset consists of a plurality of RBGs.
  • Resource allocation type 1 may also be referred to as a subset scheme.
  • Resource allocation type 2 includes a method of allocating contiguous PRBs and a method of allocating resources consisting of non-contiguous PRBs. Resource allocation type 2 may also be referred to as a compact method.
  • FIG. 6 shows bitmaps used in resource allocation types 0 and 1.
  • FIG. FIG. 7 illustrates resources that can be indicated according to the bitmap of FIG. 6.
  • the bitmap is composed of a total of 12 bits to allocate some or all of a total of 32 PRBs.
  • the first 1 bit of the bitmap is a header and indicates resource allocation type 0 (when the bit value of the header is 0) or 1 (when the bit value of the header is 1).
  • a 'bitmap for RBG' consisting of 11 bits after the header in the bitmap may indicate any one of a total of 11 RBGs.
  • the bitmap for RBG is the ceiling (N PRB / P) bit.
  • resource allocation type 0 is a method of allocating a resource block group by tying a plurality of resource blocks and then allocating resources in RBG.
  • the density of resource allocation varies according to the size of the resource block group. That is, if the size of the resource block group is large, the density is low, and if the size of the resource block group is small, the density is large.
  • the size P of the resource block group is defined according to the number of resource blocks set in the system frequency band as shown in the following table.
  • resource allocation type 0 is impossible to allocate less than three resource blocks, and thus detailed resource allocation is impossible.
  • 3GPP LTE provides resource allocation type 1.
  • the number of bits of the resource allocation type 1 bitmap is the same as the number of bits of the resource allocation type 0 bitmap. However, the interpretation is different.
  • the bits located after the header are interpreted as a 2-bit subset indicator, a 1-bit shift, and a bitmap for an 8-bit subset.
  • the subset consists of a plurality of RBGs. That is, as illustrated in FIG. 7, four (subsets 1 and 2) or three RBGs (subset 3) are configured.
  • the subset indicator indicates any one of the plurality of subsets. For example, in FIG. 7, any one of subsets 1, 2, and 3 is indicated.
  • a 1-bit shift indicates to which resource block a bitmap for the 8-bit subset is. For example, shift 0 in FIG. 7 indicates that the bitmap for the subset is for eight PRBs with a small PRB number in the subset. Shift 1, on the other hand, indicates that the bitmap for the subset is for eight PRBs with a large PRB number in the subset.
  • the bitmap for the subset indicates PRBs of some of the PRBs constituting the subset in PRB units. That is, in the above example, each subset includes 12 PRBs, of which 8 PRBs can be represented as a bitmap for the subset. As described above, which of the 12 PRBs represents 8 PRBs is indicated by the shift.
  • resource allocation type 2 can be used. More specifically, it is a method of allocating consecutive PRBs among the resource allocation type 2.
  • FIG. 8 illustrates resource allocation via resource allocation type 2.
  • the maximum number of resource blocks that can be allocated to the UE is N RB , and resource blocks are numbered from 0 to (N RB ⁇ 1).
  • Resource blocks allocated to the terminal may be represented as a starting point 2 of the resource block and a length 6 of the resource block.
  • the number of combinations of resource blocks available for each starting point is different, and the total number of allocable resource block combinations is (N RB (N RB +1) / 2). Therefore, the number of bits for indicating this becomes ceiling (log 2 (N RB (N RB +1) / 2)).
  • Ceiling (x) represents the smallest integer among integers greater than or equal to x.
  • the resource allocation type 2 has an advantage that the bit number increase due to the increase in the number of N RBs is not large compared with the resource allocation types 0 and 1 using the bitmap.
  • resource allocation type 2 (compact method) has a disadvantage in that two or more discontinuous resource blocks cannot be allocated.
  • a method of allocating a resource consisting of non-contiguous PRBs from a resource allocation type 2, that is, a DVRB allocation method will be described.
  • FIG. 9 shows an example of an interleaver used in the DVRB allocation method
  • FIG. 10 shows resource allocation according to the DVRB allocation method.
  • an N Gap value of a gap size and an M RBG value of an RBG value are determined according to a system band. Accordingly, the size of the interleaver is determined.
  • the number written in each resource block of FIG. 10 is a DVRB index.
  • the DVRB indexes are interleaved and mapped to PRBs as shown in FIG. 10. At this time, the interleaver value is determined so that successive DVRB indexes do not correspond to adjacent PRBs.
  • CS cyclic shift
  • This mapping method is configured such that neighboring DVRB indexes are included in the same subset and sequentially fill the RBG in consideration of the combination of the bitmap used in resource allocation type 0 (RBG method) and resource allocation type 1 (subset method). It is. After this process, the UE can obtain diversity gain by increasing the diversity order to 4 when two DVRBs are allocated.
  • Next-generation wireless communication systems such as LTE-A
  • LTE-A can support low-cost / low-spec terminals primarily for data communication, such as meter reading, water level measurement, surveillance camera utilization, and inventory reporting on vending machines.
  • a low cost / low specification terminal mainly for low capacity data communication is referred to as a machine type communication (MTC) terminal.
  • MTC machine type communication
  • the MTC terminal Since the MTC terminal has a small amount of transmission data, unnecessary resource waste may occur when resource allocation is performed on a resource block basis which is a conventional resource allocation unit. In addition, since the MTC terminal has a large number of terminals operating in one cell, there may be insufficient resources to be allocated in some cases.
  • the present invention provides a resource allocation method capable of scheduling a divided resource block by partitioning a resource block which is a resource allocation unit, and a terminal using the method.
  • one resource block may be divided into a plurality of frequency and / or time axes.
  • the resource block may be divided into a plurality and allocated to the terminal.
  • FIG. 11 illustrates a resource allocation method according to an embodiment of the present invention.
  • the terminal transmits resource allocation unit information to the base station (S200).
  • the resource allocation unit information is information for informing the base station of a resource allocation unit that the terminal can support.
  • the terminal may inform the base station whether the resource allocation unit that can be supported through the resource allocation unit information is a resource block, a partition partitioned resource resource, or both.
  • the resource allocation unit information may be delivered to the base station through message 3 in the random access procedure of the terminal. The random access procedure of the terminal will be described later.
  • the base station instructs the terminal in the resource allocation mode through a higher layer signal such as an RRC message (S210).
  • the base station may indicate the resource allocation mode based on the resource allocation unit information transmitted by the terminal or may indicate the resource allocation mode independently of the resource allocation unit information.
  • the resource allocation mode is divided into 1. resource block mode and 2. resource block partitioning mode.
  • the resource block mode is a resource allocation mode in which a resource allocation unit is a resource block. That is, the resource is allocated to the terminal using the resource block as a resource allocation unit as in the conventional method.
  • the resource block partitioning mode is a partition in which a resource allocation unit divides resource blocks, not resource blocks.
  • the resource block dividing mode divides the first resource unit to generate a second resource unit, and uses the second resource unit as a resource.
  • the first terminal may be an existing terminal, and the second terminal may be an MTC terminal. That is, the first terminal and the second terminal may be terminals operating according to different standard standards.
  • the first resource unit may be a resource block, and the second resource unit may be a partition obtained by dividing the resource block into a frequency axis and / or a time axis.
  • the base station transmits section selection information indicating a section in the resource block (S220).
  • the partition selection information may be transmitted through an upper layer signal such as an RRC message or included in a downlink grant or an uplink grant.
  • the partition selection information may indicate to the terminal which of the B partitions to use when the resource block is divided into B blocks.
  • each bit of the bitmap corresponds to each of the B partitions and may indicate a partition allocated to the terminal.
  • the resource allocation mode indication may be included in the bitmap constituting the partition selection information and transmitted.
  • the bitmap may consist of 2 bits.
  • the partition located on the higher frequency axis in the resource block is selected.
  • the partition located on the lower frequency axis in the resource block is selected.
  • the value of the bitmap is '11', both partitions are selected, and when the value of the bitmap is '00', it may indicate that the resource block mode is used.
  • the partition selection information may be additionally applied only when the terminal is allocated only one resource block length. In this case, if two or more resource block lengths are allocated to the terminal, all bit values of the partition selection information may be fixed to 0 or 1 and may be used as a virtual CRC.
  • the base station transmits resource allocation information (S230).
  • the resource allocation information is information for scheduling resources to the UE in resource block units, and an uplink grant and a downlink grant may correspond thereto.
  • the resource allocation information may be the same as before if the partition selection information is transmitted in an upper layer signal such as an RRC message. On the other hand, if the partition selection information is transmitted in the uplink grant and the downlink grant, some fields may be different.
  • the terminal selects the partition indicated by the partition selection information from the resource block indicated by the resource allocation information (S240). Thereafter, the terminal receives a signal or transmits a signal from the selected resource.
  • the partition selection information may indicate a specific partition in each of the allocated resource blocks. For example, when resource block # 1, resource block # 2, and resource block # 3 are allocated to the terminal through resource allocation information, and the bitmap which is partition selection information is '10', the resource blocks # 1, 2, and 3 To indicate the first compartment. Alternatively, when the bitmap, which is partition selection information, is '01', this indicates a second partition of resource blocks # 1, 2, and 3.
  • the partition selection information may indicate a partition in a specific resource block among resource blocks allocated when a plurality of resource blocks are allocated to the terminal. For example, assume that resource blocks # 1, resource blocks # 2, and resource blocks # 3 are allocated to the terminal through resource allocation information, and each resource block is divided into two partitions. In this case, when the bitmap as partition selection information is '10', this indicates that the first partition of resource block # 3 is allocated, and resource blocks # 1 and 2 indicate that the entire resource block is allocated. Alternatively, when the bitmap as partition selection information is '01', this indicates that the second partition of resource block # 1 is allocated, and resource blocks # 2 and 3 indicate that the entire resource block is allocated. Alternatively, when the bitmap as partition selection information is '11', the resource blocks resource blocks # 1, 2, and 3 may indicate that the entire resource block is allocated.
  • the resource allocation information may be different from the existing resource allocation information and some bit fields.
  • DCI format 0 is used for PUSCH scheduling.
  • Control information (field) transmitted through DCI format 0 is as follows.
  • DCI format 0 If the number of information bits including control information in DCI format 0 is smaller than the payload size of DCI format 1A, '0' is padded to be equal to the DCI format 1A and the payload size. If carrier aggregation is used, a 3-bit carrier indication field (CIF) may be added to DCI format 0.
  • CIF carrier indication field
  • DCI format 1A is used for one PDSCH codeword scheduling.
  • the following control information is transmitted in DCI format 1A.
  • MCS modulation and coding
  • DCI format 1 When the number of information bits of DCI format 1 is equal to DCI format 0 / 1A, one bit having a value of '0' is added to DCI format 1 (zero padding: ZP).
  • DCI format 1 if the number of information bits is equal to any one of ⁇ 12, 14, 16, 20, 24, 26, 32, 40, 44, 56 ⁇ , bits having one or more '0' values are assigned to DCI format 1.
  • the payload size is different from the payload size of the ⁇ 12, 14, 16, 20, 24, 26, 32, 40, 44, 56 ⁇ and DCI formats 0 / 1A.
  • a 3-bit carrier indication field may be added to DCI format 1A.
  • DCI formats include system information, paging information, and the like shared with terminals operating according to different standards, it is required to maintain the existing length so that all terminals can decode. It is preferable to include partition selection information while maintaining the length of the DCI format. Fields unnecessary for the MTC terminal in the above-described DCI formats are as follows.
  • Aperiodic SRS, aperiodic CQI request, etc. are also unnecessary for the MTC terminal. Since a large amount of data is not transmitted, overhead such as aperiodic SRS transmission and aperiodic CQI transmission may be greater than the gain due to frequency selective scheduling. Therefore, the aperiodic SRS request, the aperiodic CQI request field may be unnecessary. Thus, these fields can be fixed to a specific value, used as a virtual CRC, or dedicated for other purposes.
  • the MTC terminal may reduce the number of HARQ processes and limit the number of MCS levels. Therefore, the setting of the MCS and the HARQ process number field may be eliminated or fixed to a specific value to be used as a virtual CRC or to be used for another purpose. That is, 1), 2), and 3) are available fields that can be used for other purposes for the MTC terminal.
  • FIG. 14 shows an example of including partition selection information in a resource allocation field of a DCI format.
  • the partition selection information may be transmitted by borrowing a part of the resource allocation field of the DCI format.
  • the resource allocation field indicates the starting point of the resource block and the length of the resource block (ie, the number of resource blocks).
  • some of the bits indicating the length of the resource block may be used for the partition selection information.
  • a limit may occur in the length of the resource block that can be represented.
  • partition selection information may be transmitted by borrowing a resource allocation field and other available fields.
  • the available fields for the MTC terminal have been described above.
  • the length of the resource block may be limited in the resource block allocation.
  • the partition selection information may be transmitted while maintaining the resource allocation field. That is, the partition selection information may be transmitted by using fields other than the resource allocation field.
  • a field indicating a HARQ process number (HARQ process field) and an MCS field may be borrowed. Since the MTC terminal has a high probability that one HARQ process or fewer HARQ processes are performed than the maximum value indicated by the HARQ process field, all or some bits of the HARQ process field may be unnecessary. In addition, since the combination of the MCS applied to the MTC terminal is also likely to be limited, all or some bits of the MCS field may be unnecessary.
  • the partition selection information can be linked with the DM-RS CS. That is, the partition selection information may be transmitted to the terminal through the DM-RS CS value. Since the DM-RS configured through the RRC message is cell common, only the interval of the DM-RS CS transmitted through the DCI format needs to be considered.
  • Table 3 shows DM-RS CS field values combined to maximize CS between terminals simultaneously allocated.
  • the same Greek letters in Table 3 indicate the groups with the largest CS intervals.
  • the Greek letters ⁇ , ⁇ , ⁇ , ⁇ are for the group with the largest gap between them, and the Greek letters ⁇ , ⁇ for the group with the largest gap between the three.
  • partition selection information bitmap indicating the partition selection information
  • the bitmap (partition selection information bitmap) indicating the partition selection information is 2 bits.
  • the partition selection information bitmap indicates a partition within a resource block through one of '01' and '10'.
  • two values of the partition selection information bitmap may be mapped to DM-RS CS values (000, 001) or (010, 111), or (011, 110), or (100, 101). Then, the terminal can know the value of the partition selection information bitmap according to the DM-RS CS value.
  • the bitmap representing the partition selection information is 3 bits.
  • the resource block is divided into three partitions, and the values (001, 010, 100) of the partition selection information bitmap indicate which one of the three partitions is used in turn.
  • three values of the partition selection information bitmap may be mapped to DM-RS CS values (000, 011, 101) or (001, 100, 110). That is, three values of the partition selection information bitmap may be exclusively mapped to three values of the DM-RS CS.
  • the terminal may acquire the partition selection information according to the value of the DM-RS CS field and identify the radio resource allocated to the terminal.
  • This method is a method of transmitting partition selection information while maintaining the length of the bitmap used in DCI format 1 or the like.
  • the RBG scheme (resource allocation type 0) and the subset scheme (resource allocation type 1) are allocated to a resource block through a bitmap.
  • the allocation method in units of resource blocks is a subset method.
  • the RB partitioning mode may be applied to a subset scheme.
  • an entire bitmap transmitted in resource allocation type 1 includes a header, a subset indicator, a shift, and a bitmap for subset.
  • the lengths of the entire bitmaps are kept the same, but the partition selection information may be transmitted by borrowing some bits of the bitmap for the subset.
  • the length of the bitmap for the subset is shortened, which may cause a limitation in resource allocation.
  • the length of the entire bitmap may be kept the same, but the subset indicator may be extended by borrowing some bits of the bitmap for the subset.
  • the type of subset may be extended in consideration of the case where the resource block is divided, and may indicate any one subset of the extended subset through the extended subset indicator.
  • the above-described methods show an example of transmitting partition selection information by using an existing DCI format. But this is not a limitation. That is, the partition selection information may be transmitted using the new DCI format.
  • FIG. 16 shows an example of generating a DCI format separate from the existing DCI format.
  • the DCI format may include a field indicating the length L of a resource block and partition selection information.
  • the length L of the resource block may be limited to 1, for example.
  • the field indicating the length of the resource block is fixed to 1 bit, and partition selection information indicating a partition in the resource block may be located next.
  • the DCI format may include other fields required.
  • the present invention can be applied at the random access of the terminal.
  • system resources are managed by a base station, and dedicated resources cannot be allocated to the terminal until the terminal is first connected with the base station. Therefore, in the initial access process with the base station, a plurality of terminals are connected by a random access method sharing and using the same radio resources.
  • the base station broadcasts PRACH configuration such as available time-frequency resources and available RACH preamble set information as system information (S101).
  • the terminal receives the system information broadcast from the cell to be accessed, selects and transmits the RACH preamble available for the time-frequency resource accordingly (S102). This is called message 1.
  • the base station recognizes a cell to which the terminal intends to access through the RACH preamble and the transmitted time-frequency resource, and transmits an RACH response through the PDCCH using the RA-RNTI corresponding to the time-frequency resource to which the preamble is transmitted (S103). .
  • the RACH response is called message 2.
  • the RACH response transmits time alignment information, an initial uplink grant, and temporary C-RNTI allocation information.
  • the UE detects whether a PDCCH indicated by the corresponding RA-RNTI is received during a specific time interval after transmitting the RACH preamble.
  • the UE When the UE includes the RACH preamble information transmitted by the UE in the received RACH response, the UE transmits an RRC connection request and an NAS UE ID through the PUSCH allocated through the first uplink grant (S104). That is, the terminal performs scheduled transmission, which is called message 3.
  • the base station transmits a contention resolution message to the terminal (S105).
  • the competition resolution message is called message 4. If there is no contention, the TC-RNTI becomes a C-RNTI, and then the UE detects and receives the PDCCH indicated by the C-RNTI.
  • the UE accesses using a physical random access channel (PRACH) based on system information broadcast by the base station.
  • PRACH physical random access channel
  • the type of the terminal cannot be known by the existing PRACH. That is, it is not possible to distinguish whether the existing terminal or MTC terminal. Therefore, regardless of the type of the terminal, resource allocation for message 2 is performed by using resource blocks as resource allocation units.
  • the terminal transmits its information to the base station through message 3, where the terminal may inform the base station whether the terminal is an existing terminal or an MTC terminal. That is, the terminal may inform the base station of the resource allocation unit information.
  • the base station receiving the message 3 may know whether it is an MTC terminal or an existing terminal. In case of an MTC terminal, the base station may allocate resource by applying a resource block partition mode.
  • Whether to apply the resource block splitting mode may be always applied to the MTC terminal after receiving the message 3 or may be set through the RRC message.
  • the DCI transmitted to the common search space may be allocated in units of resource blocks in the same manner as before, and resource allocation by resource block division may be limited to DCI transmitted to the UE-specific search space.
  • FIG. 18 shows a configuration of a base station and a terminal according to an embodiment of the present invention.
  • the base station 100 includes a processor 110, a memory 120, and an RF unit 130.
  • the processor 110 implements the proposed functions, processes and / or methods. For example, the processor 110 indicates a resource allocation mode to the terminal, and transmits partition selection information and resource allocation information indicating a partition in the resource block. The resource allocation mode may be transmitted by being included in the partition selection information or separately.
  • the memory 120 is connected to the processor 110 and stores various information for driving the processor 110.
  • the RF unit 130 is connected to the processor 110 and transmits and / or receives a radio signal.
  • the terminal 200 includes a processor 210, a memory 220, and an RF unit 230.
  • the processor 210 implements the proposed functions, processes and / or methods. For example, the processor 210 transmits resource allocation unit information of a terminal to a base station, receives partition selection information indicating a partition in a resource block, and receives resource allocation information. The processor 210 selects a partition indicated by the partition selection information from the resource block indicated by the resource allocation information, and then transmits a signal or receives a signal to the base station using the selected resource. If the type of the terminal is classified into a first type terminal using resource blocks in resource allocation units and a second type terminal supporting partitions in which resource blocks are divided in resource allocation units, the terminal 200 is a second type terminal. Can be. Even the second type terminal may optionally support resource blocks in resource allocation units.
  • the memory 220 is connected to the processor 210 and stores various information for driving the processor 210.
  • the RF unit 230 is connected to the processor 210 to transmit and / or receive
  • Processors 110 and 210 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters for interconverting baseband signals and wireless signals.
  • the memory 120, 220 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device.
  • the RF unit 130 and 230 may include one or more antennas for transmitting and / or receiving a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in the memories 120 and 220 and executed by the processors 110 and 210.
  • the memories 120 and 220 may be inside or outside the processors 110 and 210, and may be connected to the processors 110 and 210 by various well-known means.

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Abstract

La présente invention se rapporte à un procédé et à un appareil adaptés pour permettre à un terminal de se voir allouer une ressource sans fil dans un système de communication sans fil. Le procédé selon l'invention comprend les étapes consistant : à recevoir des informations de sélection de section qui indiquent des sections à l'intérieur d'un bloc de ressources ; à recevoir des informations d'allocation de ressources ; et à sélectionner la section qui est indiquée par les informations de sélection de section à partir d'un bloc de ressources qui est indiqué par les informations d'allocation de ressources. Le terminal est un terminal d'un second type ; les informations de sélection de section sont des informations qui servent à indiquer la section, qui est une division d'un bloc de ressources qui constitue un module d'allocation de ressources, par rapport à un terminal d'un premier type ; et le terminal du second type est un terminal qui utilise la section en tant qu'un module d'allocation de ressources.
PCT/KR2012/004650 2011-06-13 2012-06-13 Procédé et appareil pour allouer une ressource dans un système de communication sans fil WO2012173385A2 (fr)

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